Manuale d’uso / di manutenzione del prodotto 070-8030-01 del fabbricante Tektronix
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Service Manual 1780R-Series V ideo Measur ement Set SN B030000 & Up 070-8030-01 This document supports firmware version 1.16 and above. W arning The servicing instructions are for use by qualified personnel only . T o avoid personal injury , do not perform any servicing unless you are qualified to do so.
Copyright © T ektronix, Inc. All rights reserved. T ektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved.
Service Assurance If you have not already purchased Service Assurance for this product, you may do so at any time during the product’ s warranty period.
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W ARRANTY T ektronix warrants that the products that it manufactures and sells will be free from defects in materials and workmanship for a period of three (3) years from the date of shipment.
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1780R-Series Service Manual i T able of Contents General Safety Summary xi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Service Safety Summary xiii . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preface xv .
T able of Contents ii 1780R-Series Service Manual Operating Information 2–27 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front-panel Controls 2–28 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
T able of Contents 1780R-Series Service Manual iii Adjustment Procedures General Information 5–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Recommended Equipment List 5–4 . . . . . . . . . . . . .
T able of Contents iv 1780R-Series Service Manual Options CR T Options 7–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Cord Options 7–1 . . . . . . . . . . . . . . . . . . . . . .
T able of Contents 1780R-Series Service Manual v List of Figures Figure 1–1: Simplified r epresentation of the 1780R-Series V ideo Measurement Set 1–1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2–1: Rear panel for the T ektronix 1780R-Series Measurement Set 2–3 .
T able of Contents vi 1780R-Series Service Manual Figure 4–1: 5% signal Attenuator for checking differ ential gain 4–4 . . . . Figure 4–2: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.
T able of Contents 1780R-Series Service Manual vii Figure 5–1 1: Adjustment locations on the V ectorscope circuit board (Assembly A6) 5–21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 5–12: Connections for adjusting the calibrator amplitude 5–22 .
T able of Contents viii 1780R-Series Service Manual List of T ables T able 1–1: Input/Output 1–4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T able 1–2: W aveform Monitor V ertical System 1–5 . . . . . . . . . . . .
T able of Contents 1780R-Series Service Manual ix T able 5–1: Recommended Equipment 5–4 . . . . . . . . . . . . . . . . . . . . . . . . . T able 5–2: 1780R-Series Adjustments for Calibration Procedure 5–8 . . T able 5–3: 1780R-Series Initial Control Settings 5–12 .
T able of Contents x 1780R-Series Service Manual.
1780R-Series Service Manual xi General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. T o avoid potential hazards, use this product only as specified. Only qualified personnel should perform service pr ocedures.
General Safety Summary xii 1780R-Series Service Manual T erms in this Manual. These terms may appear in this manual: W ARNING. W arning statements identify conditions or practices that could r esult in injury or loss of life.
1780R-Series Service Manual xiii Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures.
Service Safety Summary xiv 1780R-Series Service Manual.
1780R-Series Service Manual xv Preface This Service Manual is part of a 2-volume set. Its companion manual is the Operator ’ s Manual, which is aimed primarily at operating personnel. Information in this volume is intended for those who are required to maintain the 1780R-Se- ries V ideo Measurement Set.
Preface xvi 1780R-Series Service Manual.
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1780R-Series Service Manual 1–1 Product Description The T ektronix 1780R-Series V ideo Measurement Set is a 19-inch wide, 5 1/4-inch high, 18-inch deep dual-CR T W aveform Monitor/V ectorscope.
Product Description 1–2 1780R-Series Service Manual signals. The probe input has gain and input compensation for both X1 and X10 probes. The instrument control system is based on a National Semiconductor 32CG16 Microprocessor , with an additional line rate processor that makes line-by-line measurement decisions.
1780R-Series Service Manual 1–3 Specifications This section of the manual contains the specifications for the 1780R-Series. T abular information is divided into two categories. First there are the Perfor- mance Requirements which is assured by T ektronix Inc.
Specifications 1–4 1780R-Series Service Manual T able 1–1: Input/Output Characteristic Performance Requirement Supplemental Information Performance Check Step V ertical Ranges V olts Full Scale Accuracy 1.0 1.0 V ± 0.007 V . Peak-to-peak Amplitude for Full Graticule 1.
Specifications 1780R-Series Service Manual 1–5 T able 1–2: Waveform Monitor V ertical System Characteristic Performance Requirement Supplemental Information Performance Check Step Return Loss CH A, B1 , B2, or B3 >40 dB DC to 5 MHz. (T erminated in 75 W .
Specifications 1–6 1780R-Series Service Manual T able 1–2: Waveform Monitor V ertical System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement DC Restorer Clamp Point Backporch or Sync Tip. (All clamps controlled together .
Specifications 1780R-Series Service Manual 1–7 T able 1–2: Waveform Monitor V ertical System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Diff Steps (Differentiated Steps Attenuation) >40 dB at 3.
Specifications 1–8 1780R-Series Service Manual T able 1–3: Waveform Monitor Probe Input Characteristic Performance Requirement Supplemental Information Performance Check Step Input Resistance 1 M W . Input RC Product 20 m s (20 pF). Gain Unity ± 3%.
Specifications 1780R-Series Service Manual 1–9 T able 1–4: Waveform Monitor Horizontal Deflection System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Sweep Linearity 1 Line (5 m s/Div .) ± 1%. 34 2 Line (10 m s/Div .
Specifications 1–10 1780R-Series Service Manual T able 1–4: Waveform Monitor Horizontal Deflection System (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement RGB/YRGB Staircase Input Amplitude A +10 V input will result in a horizontal display of 9 divisions ± 1.
Specifications 1780R-Series Service Manual 1–1 1 T able 1–5: Waveform Monitor dG and dP Display Characteristic Performance Requirement Supplemental Information Performance Check Step Differential Gain Deflection Factor 5% dG deflects the trace 50 IRE (NTSC) or 500 mV (P AL) ± 5%.
Specifications 1–12 1780R-Series Service Manual T able 1–6: Synchronization Characteristic Performance Requirement Supplemental Information Performance Check Step Sync Input Internal Ref. Sync Separator 0.2 to 2.0 V peak-to-peak com- posite video.
Specifications 1780R-Series Service Manual 1–13 T able 1–6: Synchronization (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Jitter from missing line sync pulses <15 ns per missing sync pulse. Maximum of 10 consecutive line sync pulses.
Specifications 1–14 1780R-Series Service Manual T able 1–7: V ectorscope V ector Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Display V ector Phase Accuracy ± 1.25 _ . Measured with color bar signal.
Specifications 1780R-Series Service Manual 1–15 T able 1–7: V ectorscope V ector Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement V ariable GAIN Range +14 dB to –6 dB of 75% color bar preset gain.
Specifications 1–16 1780R-Series Service Manual T able 1–9: V ectorscope SCH Phase Display (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Input Timing Correct relative SCH operation with displayed video delayed up to 2 m s or advanced up to 1.
Specifications 1780R-Series Service Manual 1–17 T able 1–1 1: Power Requirements (Cont.) Characteristic Performance Check Step Supplemental Information Performance Requirement Crest Factor ≥ 1.
Specifications 1–18 1780R-Series Service Manual T able 1–14: Certifications and Compliances EC Declaration of Conformity – EMC Meets intent of Directive 89/336/EEC for Electromagnetic Compatibility .
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1780R-Series Service Manual 2–1 Installation Overview This section provides information on both mechanical and electrical installation of the 1780R-Series V ideo Measurement Set. Be sure to read this material prior to physically mounting the instrument in either a rack mount or portable configuration.
Installation 2–2 1780R-Series Service Manual In addition to the standard accessories in T able 2–1 there are a number of optional accessories that can be purchased, such as a portable case, maintenance kits, etc., to complement the 1780R-Series V ideo Measurement Set.
Installation 1780R-Series Service Manual 2–3 Figure 2–1: Rear panel for the T ektronix 1780R-Series Measurement Set EXT REF . High impedance bridging loop through connector for either composite sync or black burst. AUX IN. 75 W input for video signals.
Installation 2–4 1780R-Series Service Manual Installation Requirements The 1780R-Series is designed for efficient use of rack space. It can be mounted flush with other equipment, eliminating the need for air circulation above and below the cabinet.
Installation 1780R-Series Service Manual 2–5 Figure 2–2: Settings for the rear-panel mains selector switch In addition to being able to configure the 1780R-Series through user interaction with a s.
Installation 2–6 1780R-Series Service Manual T able 2–3: Plug Jumpers for Waveform Board (Assembly A2) (Schematic Diagrams 3 through 15) Jumper Number Name Plug Position Purpose J192 <9> Rem.
Installation 1780R-Series Service Manual 2–7 T able 2–4: Plug Jumpers and DIP Switch on the Microprocessor Board (Assembly A5) (Schematic Diagrams 16 through 19) Jumper Number Name Plug Position P.
Installation 2–8 1780R-Series Service Manual T able 2–5: Plug Jumpers for V ectorscope Board (Assembly A6) and Oscillator Board (Assembly A7) (Cont.) Jumper Number Purpose Plug Position Name J320 (A7) <34> Diff Phase Display 1-2 { 2-3 Double (H)/4 Single (V)/2 { Factory installed position.
Installation 1780R-Series Service Manual 2–9 The rear-panel REMOTE connector is a subminiature 15-pin D-type receptacle with female contacts. All the active remote control lines can be forced low by remote ground closures or TTL levels. Pin assignments for the REMOTE connector are shown in Figure 2–4.
Installation 2–10 1780R-Series Service Manual The rear-panel SERIAL interface connector is a 9-pin, sub-miniature, D-type connector . It is used as an RS422A or RS232D interface to the 1780R-Series microcontroller , drivers for both interfaces are resident.
Installation 1780R-Series Service Manual 2–1 1 (of the 9-pin male connector) and pin 7 (of the 25-pin female connector). In addition, pins 4 and 5 and pins 6, 8, and 20 of the 25-pin connector will need to be wired together .
Installation 2–12 1780R-Series Service Manual Responses from the 1780R-Series SERIAL interface are shown in T able 2–7. T able 2–7: Serial Remote Responses Command Description A The transmission was successful (ACK) C Command not known. (The # character was received, but was not followed by a U, u, D, d, P , or p.
Installation 1780R-Series Service Manual 2–13 8 1 9 15 Figure 2–7: Rear-panel XY connector diagram showing the function of each pin Mechanical Installation All qualification testing for the 1780R-Series was performed with the rack- mount cabinet installed.
Installation 2–14 1780R-Series Service Manual Rack Mounting The 1780R-Series The 1780R-Series rack-mounting cabinet is designed for permanent mounting. The instrument slides in and out of the cabinet with relative ease. The instrument is secured in the cabinet with four 6–32 TORX R drive screws.
Installation 1780R-Series Service Manual 2–15 Figure 2–9: Dimensions used for rack mounting the 1780R-Series Video Measurement Set Figure 2–10: Dimensions of the adjustable rear rackmounting bra.
Installation 2–16 1780R-Series Service Manual T o install the instrument in the rack: First remove the four securing screws and take the instrument out of the rack-mounting cabinet. (All 1780R-Series instruments are shipped in the rack-mounting cabinet to provide extra shipping protection.
Installation 1780R-Series Service Manual 2–17 The 1780R-Series can be mounted in a portable case. This case is an optional accessory , and is nomenclated 1780F02. The portable case consists of a metal cabinet with feet, front elevating bail, carrying handle (all installed), and front and back protective covers.
Installation 2–18 1780R-Series Service Manual In the procedures that follow the 1780R-Series front-panel control names are in ALL CAPIT ALS and menu items are enclosed in <>. The Calibration menu is available for both vector and waveform, and uses both CR T s.
Installation 1780R-Series Service Manual 2–19 2. Push the front-panel CONFIGURE button and touch <FIXED CAL AMPL> until 1000 (1.0 V olt) is outlined. 3. Push the front-panel CALIBRA TE button. Push the button below the W aveform CR T . 4. <READOUT INTENSITY> will be circled on the V ectorscope CR T .
Installation 2–20 1780R-Series Service Manual 10. Select <VER T CAL> as shown in Figure 2–13. The large knob will now adjust signal amplitude with respect to the graticule. Adjust for a 1 V olt display on the W aveform CR T . Leave the CALIBRA TE button set to On.
Installation 1780R-Series Service Manual 2–21 12. Apply a 1.0 volt signal to the EXT HORIZ input. T ouch <EXT HORIZ CAL>. The large knob will now adjust sweep length (time) with respect to the graticule. Do not change the MAG setting (automatically set to 100 mV/div).
Installation 2–22 1780R-Series Service Manual 7. T ouch <TRACE ROT A TION> to obtain a test axis, then use the large knob to adjust trace rotation on the V ectorscope CR T . Align the horizontal lines of the electronic graticule parallel with the V ectorscope CR T graticule.
Installation 1780R-Series Service Manual 2–23 Figure 2–14: 1780R (NTSC) V ectorscope Calibration menu display with CAL OSC on Figure 2–15: 1781R (P AL) V ectorscope Calibration menu display.
Installation 2–24 1780R-Series Service Manual Repackaging If the instrument is to be shipped to a T ektronix Service Center , attach a tag to the instrument showing: 1. Owner (with complete address) and the name of the person at your firm that can be contacted.
Installation 1780R-Series Service Manual 2–25 Figure 2–16: 1780R-Series repackaging.
Installation 2–26 1780R-Series Service Manual.
1780R-Series Service Manual 2–27 Operating Information In order to effectively service the 1780R-Series it is essential to understand how the controls work.
Operating Information 2–28 1780R-Series Service Manual 1 23 48 56 7 9 1 0 19 1 8 1 7 16 15 11 1 2 13 14 Figure 2–18: Front panel of the 1780R-Series Video Measurement Set Front-panel Controls W it.
Operating Information 1780R-Series Service Manual 2–29 7. VER T POS. Positions the selected display up and down. Positioning range depends on the display selected; range is much greater for the waveform monitor displays than it is for the vectorscope displays.
Operating Information 2–30 1780R-Series Service Manual 19. < >. A pair of momentary contact switches that provide stepped levels that duplicate the function of the Precision Measurement control.
Operating Information 1780R-Series Service Manual 2–31 Functional Measurement Controls Functional Measurement Controls are shown in Figure 2–19. Note that the numerical entries are enclosed in rectangles instead of the circles that were used in Figure 2–18.
Operating Information 2–32 1780R-Series Service Manual 3. P ARADE / OVERLA Y . Momentary contact switch that cycles through selections of sequential displays that can be up to 3 lines or 3 fields on a single display , depending on the selected waveform sweep.
Operating Information 1780R-Series Service Manual 2–33 transitions) display . Small front-panel light-emitting diodes indicate the selected filter . 11 . ONE / TWO / THREE. Momentary contact switch that toggles through two sweep positions (1-line or 1-field and 2-line or 2-field; 3-line or 3-field is activated by holding the button in).
Operating Information 2–34 1780R-Series Service Manual.
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1780R-Series Service Manual 3–1 Theory of Operation Contents of this section are designed to work with the block and schematic diagrams in Section 9, at the back of this manual.
Theory of Operation 3–2 1780R-Series Service Manual This diagram contains the interface to the front-panel switches, indicators, and touch panels along with the rear-panel serial and remote connectors. In addition, it contains circuitry that controls internal switching functions and generates readout for both CR T s.
Theory of Operation 1780R-Series Service Manual 3–3 T able 3–1: Schematics and Circuit Board Assemblies Diagram Number Schematic Name Assembly Name Assembly Number 1 Input Amplifiers A and B1 Inpu.
Theory of Operation 3–4 1780R-Series Service Manual T able 3–1: Schematics and Circuit Board Assemblies (Cont.) Diagram Number Assembly Number Assembly Name Schematic Name 32 Digital Shifter Oscil.
Theory of Operation 1780R-Series Service Manual 3–5 Diagrams 1 & 2 Input Amplifiers The Input board contains four amplifiers that give the input signal gain, DC restore it, and send it to the + and – Amplifiers. Since they are identical circuits, only the operation of Channel A will be described.
Theory of Operation 3–6 1780R-Series Service Manual inverting input, pin 2 of U418) form a low-pass filter , with a notch at the subcarrier frequency .
Theory of Operation 1780R-Series Service Manual 3–7 Diagram 3 Probe Input and DC Restorer The 1780R-Series is equipped with a front-panel Probe Input, which allows it to be used to make some measurements not normally possible with a waveform monitor or vectorscope.
Theory of Operation 3–8 1780R-Series Service Manual The voltage follower drives a current-mode feedback amplifier consisting of Q492, Q390, and Q294.
Theory of Operation 1780R-Series Service Manual 3–9 hum is not attenuated. The DC Restorer is turned off by the absence of the sample pulses at the sample input (pin 5) of U1217. Hold capacitors C1216 and C1313 discharge to 0 volts through R1314, and the emitter of Q1215 stays at 0 volts.
Theory of Operation 3–10 1780R-Series Service Manual Diagram 4 Input & Reference Selection The + and – Amplifiers select the appropriate input signal for display . The + Amplifier output goes to the + input of the Difference Amplifier , while the – Amplifier output goes to the – input.
Theory of Operation 1780R-Series Service Manual 3–1 1 Video Input Selection. Each video switch is an operational amplifier connected for unity gain, and consists of six differential amplifier inputs. An input is selected by biasing the appropriate differential pair with current from current sources Q1427 and Q1438.
Theory of Operation 3–12 1780R-Series Service Manual Diagram 5 Difference Amplifier & Video Filters The signal at the output of the Difference Amplifier is distributed to many internal circuits. Seventy-five-ohm video is provided to the Auxiliary Output and Picture Monitor BNC connectors.
Theory of Operation 1780R-Series Service Manual 3–13 Only one signal is switched through the saturating transistor at a time, although Flat, Luminance, and Chroma may be time multiplexed. The luminance filter has a 1 MHz bandwidth and a transmission zero at the subcarrier frequency .
Theory of Operation 3–14 1780R-Series Service Manual Chrominance Filter . The chrominance filter is a Lerner -type filter , exhibiting arithmetic symmetry and linear phase across its bandwidth. U827 amplifies the filtered chrominance signal to drive both the W aveform Monitor and V ectorscope circuits.
Theory of Operation 1780R-Series Service Manual 3–15 Diagram 6 V ertical Deflection The current output of the filters passes through a common base amplifier which drives a Gilbert multiplier (V ariable Gain Amplifier). Output current from the V ariable Gain Amplifier drives inputs to two separate differential amplifiers (X1 and X5).
Theory of Operation 3–16 1780R-Series Service Manual gives them five times greater transconductance. Current from U415B is switched to the appropriate differential pair by U415A and U415D. The dif ferential pair that is off has a high impedance so that it does not af fect the other pair .
Theory of Operation 1780R-Series Service Manual 3–17 Diagram 7 V ertical Control Logic, Calibrator , & Cursors The Microprocessor controls the vertical functions through three 8-bit latches.
Theory of Operation 3–18 1780R-Series Service Manual T able 3–2: Input Channel Selection Logic per i M e p (U1415) (U1415) Par Mode Internal Reference O per at i ng M od e In p ut(s) I 1 I 2 I 3 I.
Theory of Operation 1780R-Series Service Manual 3–19 DC Restorer and Reference Selection. Data for the reference and DC Restorer is latched in by U1506. This latch controls input coupling and DC Restorer operation along with the internal/external reference selection.
Theory of Operation 3–20 1780R-Series Service Manual U1 105 is a logic array that selects the timing rate (pin 16) for the logic on this schematic. HSYNC or VSYNC is selected depending on whether the horizontal sweep rate is at a line rate or field rate.
Theory of Operation 1780R-Series Service Manual 3–21 Diagram 8 Reference Sync Generation Both Internal and Reference sync inputs are filtered by active low-pass filters. The Internal Sync Separator is a descrete clamped operational amplifier circuit that is clamped just above sync tip level to clip off active video.
Theory of Operation 3–22 1780R-Series Service Manual R1 156 and R1253 setting the AC gain. CR1155, CR1254, U1 159A, and C1254 form the feedback clamp. The clamp sets sync tip to +3 V at the operational amplifier output (U1 159 pin 1). U1159B and R1260 provide a constant current discharge path for C1254 during sync time.
Theory of Operation 1780R-Series Service Manual 3–23 pulse when the 50% sync point corresponds with a negative subcarrier zero crossing ± 80 ° . This positive-going output pulse drives the SCH color framing logic on Diagram 14.
Theory of Operation 3–24 1780R-Series Service Manual Diagram 9 H & V Sync Generators The Horizontal and V ertical (line and field) Sync Generators extract the synchronizing signals from the output of the Reference Sync Separator (Diagram 8) or the Remote Sync Input to supply the required sync signals for the rest of the instrument.
Theory of Operation 1780R-Series Service Manual 3–25 U185D or U185A being gated through. The output of U185C is Reference Sync and Direct Remote Sync. V Sync Detector . Q385 and Q391 form an integrating Sync Detector that has an output when the vertical broad pulse occurs.
Theory of Operation 3–26 1780R-Series Service Manual Ref H Sync Generator . The Reference Horizontal Sync Generator is made up of two one-shot multivibrators. U596B is triggered by the direct or AFC sync from the Direct or AFC switch. Its Q output is a 0.
Theory of Operation 1780R-Series Service Manual 3–27 too long for P AL signals, a jumper (on Diagram 10) is provided to realign the Fld Retrace Gate with V sync. See Field Sweep Gate description, on Diagram 10, for details. Clamp Pulse Generator for W aveform Display .
Theory of Operation 3–28 1780R-Series Service Manual Diagram 10 Ramp Generator The Ramp Generators produce the line and field sweep ramps for the waveform displays. The slope of the ramp, for 1- 2- or 3-line or field sweep, is controlled by a Digital-to-Analog Converter (DAC).
Theory of Operation 1780R-Series Service Manual 3–29 When the sweep ramp has reached approximately 3/4 of its final amplitude the End of Sweep Detector outputs a high on the pin 1 input of U775A (OR gate) to provide a high on one input of U780A (an AND gate).
Theory of Operation 3–30 1780R-Series Service Manual In 3-field sweep modes the FLD Retrace Gate is always high. The Field Ramp Generator End of Sweep Detector outputs a high in the last third of the ramp.
Theory of Operation 1780R-Series Service Manual 3–31 Whenever either End of Sweep Detector goes high U790B outputs a correspond- ing high (T rig En) to synchronize cursor display , calibrator display , and differential gain and phase displays. Retrace Switch Blanking.
Theory of Operation 3–32 1780R-Series Service Manual Diagram 1 1 Horizontal Magnifier & Output Amplifiers The Magnifier Amplifier provides selection of fixed voltage gains for the Line and Field Ramp Generator sweep ramps. This provides the time per division variation on the horizontal axis of the CR T display .
Theory of Operation 1780R-Series Service Manual 3–33 gain of the amplifier is increased. When a gain greater than X5 is selected, the lower gain transistors are also saturated, turning on up to all six attenuator transistors for X100 magnification. The capacitors C572 and C575 provide compensation for the amplifier at gains less than X50.
Theory of Operation 3–34 1780R-Series Service Manual Readout Switching. When /WFM READOUT EN is high, the H RO DA T A WFM signal is disconnected from the Output Amplifier by turning on Q267 to short the readout signal to the –2.
Theory of Operation 1780R-Series Service Manual 3–35 Diagram 12 Horizontal Latches & DAC Eight-bit digital data from the Microprocessor , used to control horizontal as well as some vertical functions, is latched onto the circuit board. A Latch Select Decoder , using three address bits, controls the Data Latch operation.
Theory of Operation 3–36 1780R-Series Service Manual Sample-and-Holds. The sample-and-holds sample the output of the DAC when its analog switch is closed. U708 is an analog multiplexer employed as a single- pole, 8-throw switch. U245 is a dual-in-line switch package using three sections.
Theory of Operation 1780R-Series Service Manual 3–37 Diagram 13 Slow Sweep & Ext Horiz Input The External Horizontal Input Amplifier is a non-inverting amplifier that inputs a ramp voltage of ≈ 5 volts to produce a 10-division sweep ramp.
Theory of Operation 3–38 1780R-Series Service Manual 50% to above, the output of the amplifier changes from being limited at the positive supply to being limited at the negative supply . This negative transition is coupled through C557, turning on Q658 to begin the ramp.
Theory of Operation 1780R-Series Service Manual 3–39 Diagrams 14 & 15 SCH Phase Timing & Sync Locked Oscillator The 1780R-Series displays the horizontal sync to subcarrier phase relationship as a polar plot on its V ectorscope CR T .
Theory of Operation 3–40 1780R-Series Service Manual Logic and T iming to control the oscillator is generated, based upon the burst- sync relationship of reference video. Also, field identification information is provided to the MPU for line select.
Theory of Operation 1780R-Series Service Manual 3–41 The oscillator output is divided by 4 with a Johnson counter internal to U990. The counter has four outputs that are 90 _ apart. These four signals drive a 4:1 multiplexer , also internal to U990, which is controlled by a flip-flop, U985 on Diagram 14, through pins 8 and 9.
Theory of Operation 3–42 1780R-Series Service Manual U1497B is a D-type flip-flop that generates a negative pulse ( Q ) to turn on U1397 immediately after the Sample Gate again goes low . This flip-flop-gener- ated TSC pulse is approximately 1 subcarrier cycle in duration.
Theory of Operation 1780R-Series Service Manual 3–43 flip-flops drive U980 where a color field 1 pulse is output on pin 20 during line 1 1 (NTSC) or line 7 (P AL). The 1781 also outputs a Bruch frame pulse, on pin 21, during line 7 of fields 1 and 5.
Theory of Operation 3–44 1780R-Series Service Manual Diagrams 16 & 17 Master MPU, ROM & NVRAM The Master MPU kernel consists of the NS32CG16 processor , running at 10 MHz, and its associated clock, memory , and buffering circuitry . Also included here are the Internal Chip Select and W ait State Generator P ALs.
Theory of Operation 1780R-Series Service Manual 3–45 The Master MPU normally does not use the Non-Maskable Interrupt (NMI) signal and it is held high by a pull-up voltage from one segment of R360. It can, however , be asserted for troubleshooting by placing a jumper across J342.
Theory of Operation 3–46 1780R-Series Service Manual Diagram 17 Dynamic RAM The Dynamic Random Access Memory (DRAM) is a 16-bit wide memory used by the readout engine for its instructions. The system consists of three major components; the memory array , an address multiplexer , and a control P AL.
Theory of Operation 1780R-Series Service Manual 3–47 The Master MPU memory access sequence starts when /ADS goes low , forcing Master MPUGO to be latched high by U595A&B and start the P AL sequence. /RASO, which is in-line terminated by R361 and becomes /RAS, goes low to enable the memory chip RAS input.
Theory of Operation 3–48 1780R-Series Service Manual high to remove the readout engine’ s address from the bus. The Control P AL then waits until the Master MPU raises /HOLDA, signifying its return to bus control. At this point the P AL enters the normal idle state to wait for the first Master MPU cycle.
Theory of Operation 1780R-Series Service Manual 3–49 Diagram 18 Line Rate Controller The Line Rate Controller provides real time control of the readout and line select functions for both the waveform monitor and vectorscope CR T s. It issues instructions to start, stop, hold, or skip readout.
Theory of Operation 3–50 1780R-Series Service Manual currently being used and a T askData stack that is being built for a new line number selection, or a different line rate, etc. The two bytes that are actually T askData consist of data bits that go to control lines (WLS LINE, WRO ST AR T , etc.
Theory of Operation 1780R-Series Service Manual 3–51 are ANDed together in U167 to produce a frame sync pulse. The frame sync pulse interrupts the Line Rate Controller and causes the line counter to be reset to zero, and resets the Static RAM stack pointer .
Theory of Operation 3–52 1780R-Series Service Manual line allows execution of the instruction set to continue. By inserting one WFS per instruction set, the VRO ST AR T signal will control the refresh rate of the readout. V UNBLANK (P4.4) controls the blanking of the Z-Axis for the vectorscope CR T .
Theory of Operation 1780R-Series Service Manual 3–53 The output of the WRO ST AR T LINE is wire ANDed with the VRO ST AR T to provide an RO ST AR T control line at pin 12 of U165. WRO INHB (P5.4) is wire ANDed with the control line from pin 7 of U167 and fed to the one-shot, U453A.
Theory of Operation 3–54 1780R-Series Service Manual Diagram 19 UART & A/D The Universal Asynchronous Receiver/T ransmitter (UAR T) has both RS-232 and RS-422 buffers for communication between the Master MPU (Diagram 16) and external peripherals.
Theory of Operation 1780R-Series Service Manual 3–55 J595. Pins 7 and 8 of U495 go to connector J495. This connector is used by the factory to connect to peripheral equipment when developing software. A to D Converter . The A/D Converter , U217, combines a 16-bit analog multiplex- er with an 8-bit A/D Converter .
Theory of Operation 3–56 1780R-Series Service Manual provide a 2-field sweep. Remote sync is AC-coupled with an input impedance of approximately 1 M W . Q392 is a switching transistor that is turned off when Remote Sync Enable is present and saturates when there is no enable present.
Theory of Operation 1780R-Series Service Manual 3–57 Diagram 20 Readout Engine & Read Output The asynchronous Readout Engine outputs the readout characters that are displayed on the vectorscope and waveform monitor CR T s. Digital data from the Dynamic RAM is converted to an analog output for display .
Theory of Operation 3–58 1780R-Series Service Manual State Machine Latch. The 4-bit output of the Data Latch is input to the State Machine Latch (U171, U376, and U385).
Theory of Operation 1780R-Series Service Manual 3–59 edge of the /Sample RO from the Readout State Machine. U560B drives the V ertical Output Amplifiers of the CR T s; R555 (V Shape) is a gain control.
Theory of Operation 3–60 1780R-Series Service Manual Diagram 21 Interconnect All inputs to and outputs from the MPU circuit board are through the Intercon- nect. There are two connectors on the MPU Interconnect, one that ties into the 1780R-Series main Interconnect circuit board, and one that serves as the I/O for the MPU Annex board.
Theory of Operation 1780R-Series Service Manual 3–61 Enable (/ANDBE) controls communication with the circuitry on the Annex circuit board. Address Latch.
Theory of Operation 3–62 1780R-Series Service Manual Diagrams 22, 23, & 24 MPU Annex, Front Switch Panel, & T ouch Panel Circuits on the Annex circuit board (Diagram 22) tie the 1780R-Series data bus to the front-panel switches, touch screens, indicators, and the Optical Encoder .
Theory of Operation 1780R-Series Service Manual 3–63 MPU enables U437, Read (RD) enables the buffers to read from the bus, and W rite (WR) enables the buffers to write to the bus. RL0-RL7 are data inputs from the Front Switch Panel (Diagram 23) and T ouch Panel (Diagram 24).
Theory of Operation 3–64 1780R-Series Service Manual Rotary Encoder / Decoder . U441 is the decoder for the optical rotary encoder on the touch panel. U441 compares the current inputs to CHA and CHB to the previous reading and, if there is a difference, starts an up/down binary counter .
Theory of Operation 1780R-Series Service Manual 3–65 Diagram 25 V ectorscope Input & Gain The Data Latches decode the V ectorscope operating instructions from the Master MPU. T wo of the circuits controlled by these instructions, Chroma Amp and T est Circle Oscillator , appear on this schematic.
Theory of Operation 3–66 1780R-Series Service Manual Chroma Amp. U486D is one section of a dual-in-line package (DIP) of switches that closes on a low control input (pin 16) and opens on a high. When the switch is open, Q573 turns on and parallels R566 with a network made up of C570, R571, and R568 to lower the Gain Cell gain by 25%.
Theory of Operation 1780R-Series Service Manual 3–67 Diagram 26 Diff Phase/Gain The Differential Gain and Phase Demodulators change a subcarrier rate signal into DC currents proportional to chroma amplitude (gain) and phase.
Theory of Operation 3–68 1780R-Series Service Manual The DP Zero adjustment, C172, provides a small amount of delay to the switching signal in order to have the demodulator timed to the R-Y Demodulator (Diagram 28).
Theory of Operation 1780R-Series Service Manual 3–69 for a DC level of 1 volt, with no chroma, to accommodate the Recursive Filter (Diagram 35). Demodulator Switching. U386A and B control the selection of the demodulators. For either dG or dP the Preset and Clear for U386B controls the selection of the demodulators.
Theory of Operation 3–70 1780R-Series Service Manual Diagram 27 V ector Timing & Blanking The V ectorscope display selection, chroma clamp, center dot clamp, and SCH blanking signals for the V ectorscope are generated by the V ector T iming circuits.
Theory of Operation 1780R-Series Service Manual 3–71 The input H sync pulse width, which is regenerated, is approximately a half line in duration. In order to provide a uniform duration, usable H sync is shaped by a monostable pulse shaper . Its output is supplied to the Differential Gain and Phase circuits as well as to the Blanking Logic.
Theory of Operation 3–72 1780R-Series Service Manual deflected away from the center , one or two of the comparators will drive a summing point, at the emitter of Q323 (a common base amplifier) and turn it on. When Q323 turns on, its collector goes low to disable U327C.
Theory of Operation 1780R-Series Service Manual 3–73 Diagram 28 Demodulators Chrominance from the Gain Cell is clamped to 0 volts. The V ertical and Horizontal Center Dot Clamps provide a fixed bias level to the demodulators when the Chroma Clamp forces the signal input to 0 volts.
Theory of Operation 3–74 1780R-Series Service Manual al transconductance amplifiers used in sample-and-hold circuits. The demodu- lated chrominance that is fed back drives the negative input; the positive input is driven by a Position control DC reference voltage (from the Master MPU).
Theory of Operation 1780R-Series Service Manual 3–75 Diagram 29 XY Inputs & PIX Monitor Picture monitor sweeps and XY input signals drive the Deflection Amplifiers through switching circuits on the Deflection Amplifier schematic diagram. The Sweep Generators have sufficient gain range to accommodate either 525/60 or 625/50 scanning rates.
Theory of Operation 3–76 1780R-Series Service Manual XY Input Amplifiers. U21 1 is a quad, J-FET input operational amplifier . U211A and C are balanced Differential Input Amplifiers intended for audio use. In a 600 W system, R1 13 and R308 can be adjusted to normalize signals from 0 dBm to +12 dBm (2 -9 volts p-to-p).
Theory of Operation 1780R-Series Service Manual 3–77 Diagram 30 V ector Deflection Amps Demodulated R-Y (V) and B-Y (U) is amplified and input to a switching circuit controlled by the Master MPU acting on front-panel switch selections.
Theory of Operation 3–78 1780R-Series Service Manual Horizontal and vertical readout (from the MPU), X and Y output, and picture monitor sweeps are input directly to the switching circuit for display on the V ectorscope CR T .
Theory of Operation 1780R-Series Service Manual 3–79 Deflection Amplifiers. The amplifiers are nearly identical. The V ertical Amplifier , which has VHF Compensation (C614), consists of Q61 1 and Q6.
Theory of Operation 3–80 1780R-Series Service Manual Diagram 31 Subcarrier Regenerator The Reference V ideo signal from the W aveform Monitor Reference switch (Diagram 4) is buffered and bandpass filtered before being mixed with the V oltage-Controlled Crystal Oscillator (VCXO) output to produce a control signal for the VCXO.
Theory of Operation 1780R-Series Service Manual 3–81 provide a TTL pulse at F SC to the Digital Phase Shifter and the comparison input of the Mixer stage. The External CW loop-through input is buffered, to common mode out ground currents, and bandpass filtered.
Theory of Operation 3–82 1780R-Series Service Manual present on the sync backporch. This effectively locks out black and white signals or the vertical interval, where there is backporch but no burst. U383B is one half of a dual comparator that samples the output of the Mixer stage low-pass filter .
Theory of Operation 1780R-Series Service Manual 3–83 C394 is lowered ≈ 1/3 for P AL instruments. U397 is a strobe-controlled complementary output comparator . U397 provides TTL outputs, at External CW frequency , to the Input Switch, U469, from the bandpass filtered EXT CW signal.
Theory of Operation 3–84 1780R-Series Service Manual Diagram 32 Digital Phase Shifter The Digital Phase Shifter uses the input subcarrier frequency to generate an intermediate and somewhat lower subcarrier frequency .
Theory of Operation 1780R-Series Service Manual 3–85 In addition, the divided by 7200 F SC ’ produces the counter load pulse for a Programmable Divide by 7200 Counter that outputs the reference phase to the Phase Detector in the output phase-lock loop.
Theory of Operation 3–86 1780R-Series Service Manual U338. RCO from U342 is the counter load for the programmable counter ( ÷ M and ÷ N). The input register for the programmable counter (U235 and U238) is loaded with a count from the Microprocessor Data Bus.
Theory of Operation 1780R-Series Service Manual 3–87 Diagram 33 Horizontal AFC & Post Regulators REF SYNC, originating from the H Sync Generator on Diagram <9>, is compared to the H rate sync divided down from the VCO by a Phase Detector .
Theory of Operation 3–88 1780R-Series Service Manual up, the output of the Phase Detector falls below the trigger threshold of the unijunction-wired Acquisition Sweep (Q41 1 and Q412), to turn off the ramp.
Theory of Operation 1780R-Series Service Manual 3–89 Diagram 34 Diff Gain/Phase Alt Mode Switch The 1780R-Series offers a choice of either single display mode or a double display mode that can be nulled. The Alternate, or double mode, is switched about itself to display a mirror image.
Theory of Operation 3–90 1780R-Series Service Manual Diff Gain/Phase Alternate Mode Switch. U425 implements a Switchable Polarity Amplifier , which outputs a differential current.
Theory of Operation 1780R-Series Service Manual 3–91 Diagram 35 Digital Recursive Filter The Digital Recursive Filter reduces the noise content of differential phase and differential gain signals without impacting the spectral response below 500 kHz by reinforcing the harmonic frequencies that are multiples of line rate.
Theory of Operation 3–92 1780R-Series Service Manual The D/A Converter latches data off the M Data Bus at the same time that the Adder data is loaded into the Filter Latch. The analog signal is output to a low-pass output filter to remove sampling artifacts above approximately 750 kHz.
Theory of Operation 1780R-Series Service Manual 3–93 Storage. The data stored in Static Random Access Memory (U251 and U260) is from the conversion of the previously-sampled video line and is at the same point that the A/D Converter is outputting from the current line.
Theory of Operation 3–94 1780R-Series Service Manual U400B is clocked by U261 when either /RD or /WR goes low while /Fltr Brd is low . An Exclusive OR gate internal to U261 outputs the INC pulse and increments the Address Counter .
Theory of Operation 1780R-Series Service Manual 3–95 Diagram 36 Z-Axis The W aveform and V ectorscope Z-Axis circuits act on blanking/unblanking signals from several sources to control the intensity of the CR T displays. Intensity control signals for both active display and readout are independently input to the Z-Axis circuits.
Theory of Operation 3–96 1780R-Series Service Manual from the vector intensity current source, U383C. V ector intensity is blanked if any one of the inputs to U289A is low .
Theory of Operation 1780R-Series Service Manual 3–97 Diagrams 37 & 38 Timing Cursors & Counters The timing cursors for the 1780R-Series are narrow bright-up pulses applied to the CR T cathode. They can be moved independently in 5-nanosecond intervals.
Theory of Operation 3–98 1780R-Series Service Manual will not start quickly at sync pulse time to be synchronous with the sweep. An LC Oscillator is used and calibrated to a crystal frequency reference during the vertical interval.
Theory of Operation 1780R-Series Service Manual 3–99 Sample-and-Hold. During the time that the LC Oscillator is being checked against the 10 MHz Reference, U406A is closed and U406B is open; during the time that timing cursor information is being output, the switches are in the opposite configuration.
Theory of Operation 3–100 1780R-Series Service Manual The output from U429B drives U223B, which enables the Digital Delay Counters. U429B and U223B are both cleared with the /RAMP ST AR T signal, which becomes true at the end of the digital count from the delay counters.
Theory of Operation 1780R-Series Service Manual 3–101 information. This delay information is loaded into the three counters, U333, U336, and U339. At any given time, only one cursor delay can be active; Cursor 1 and Cursor 2 time share at a 30 Hz rate.
Theory of Operation 3–102 1780R-Series Service Manual Diagram 39 CRT Display DAC The CR T Display DAC decodes digital information from the Microprocessor Data Bus to drive 16 analog control voltage outputs.
Theory of Operation 1780R-Series Service Manual 3–103 Analog Multiplexers. U346 and U348 are Analog Multiplexers. Each has one input and eight outputs; the input is the analog signal level from the DAC. The outputs are normally high impedance disconnects, except when one is selected by the digital word at inputs A, B, and C.
Theory of Operation 3–104 1780R-Series Service Manual Diagrams 40 & 45 Scale Illum & T race Rotation – Graticule Lights A T riangle Generator is employed to provide a triangular waveform to drive one input of the Pulse W idth Modulators.
Theory of Operation 1780R-Series Service Manual 3–105 Rotation Drivers. The Rotation Drivers are simple push-pull, discrete transistor , emitter followers. Each driver consists of a pnp and npn transistor pair (Q377 & Q378, Q374 & Q375) between –15 volts and +15 volts.
Theory of Operation 3–106 1780R-Series Service Manual S130 is a push-button switch with an LED that is directly beneath the W aveform CR T . It assigns Focus, Intensity , Scale Illum, and Position controls to the W aveform Monitor .
Theory of Operation 1780R-Series Service Manual 3–107 Diagram 41 V ector High V olts The W aveform Monitor high voltage supply generates all of the potentials required to power the CR T , except for the deflection voltages. The high voltage is derived from an Armstrong Oscillator-generated 33-kHz signal.
Theory of Operation 3–108 1780R-Series Service Manual C130 provides a low impedance current path for the base drive winding of T240. R222 limits Q221 base current. Power Supplies. CR151 is a potted assembly of diodes and capacitors which provides a DC output equal to four times the peak input voltage.
Theory of Operation 1780R-Series Service Manual 3–109 Focus Amp. The Focus Amp consists of Q380 and Q381 with R379 as the input resistor and R382 as the feedback resistor . Coarse focus is adjusted with R182, which is located at the Focus divider resistor string.
Theory of Operation 3–1 10 1780R-Series Service Manual Diagram 42 W aveform High V olts The W aveform Monitor high voltage supply generates all of the potentials required to power the CR T , except for the deflection voltages (however , +160 volts for the Horizontal Deflection Amplifier is generated by these circuits).
Theory of Operation 1780R-Series Service Manual 3–1 1 1 Osc. Q300 is the active element of an Armstrong Oscillator , with C410 and the primary of T210 resonating at 25 kHz. L200 and C100 filter the 25-kHz signal out of the +60 volt supply . C500 provides a low impedance current path for the base drive winding of T250.
Theory of Operation 3–1 12 1780R-Series Service Manual Grid Drive Rectifier . Z-axis high frequency information is fed to the CR T control grid through C240. Low frequency information is through C241. The Grid Drive Rectifier , consisting of CR140 and CR141, is a voltage doubler that converts peak-to-peak voltage from the PP Clamp to DC.
Theory of Operation 1780R-Series Service Manual 3–1 13 Diagram 43 Low V oltage Power Supply The low voltage power supply is a line operated switcher , of the discontinuous flyback type, running at 40 kHz. The switching transistor saturates, placing the primary voltage across the primary winding.
Theory of Operation 3–1 14 1780R-Series Service Manual The primary side of the circuit is not referenced to chassis ground and typically , the line common rides at – 150 volts, unless an isolation transformer is used.
Theory of Operation 1780R-Series Service Manual 3–1 15 R140, and C240, which protects Q250 from over-voltage. C240 and CR141 arrest the voltage spike on the flyback pulse at a safe level (approximately 650 to 700 volts). L240 and R140 limit the rise time of the current pulse in C240, quieting the noise spike.
Theory of Operation 3–1 16 1780R-Series Service Manual Pin 1 of U460 is the Error Amplifier output. Pin 2 is the minus input to the Error Amplifier , the positive terminal is internally connected to +2.5 volts. Pin 3 is the current sense input, and pin 6 is the controller output, driving the base drive circuit.
Theory of Operation 1780R-Series Service Manual 3–1 17 Output Filters. The filters are all the standard pi configuration except the –8 volt filter . There are three powdered iron beads (L420, L421, and L422) on the +5 volt secondary wires to help raise the other output voltages to the proper values.
Theory of Operation 3–1 18 1780R-Series Service Manual.
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1780R-Series Service Manual 4–1 Performance V erification This section consists of the Performance Check, used to determine compliance with the Performance Requirements listed in the Specifications section. Controls and connectors on the 1780R-Series front panel and rear panel are fully capitalized (e.
Performance V erification 4–2 1780R-Series Service Manual T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements NOTE: The 1410 Series generators with standard SPG and TSG modules can be used, but this will not allow all checks and adjustments to be made.
Performance V erification 1780R-Series Service Manual 4–3 T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 9. Video Amplitude Calibration Fixture Signal; adjustable square wave 0.0 to 999.9 mV p-p with a resolution of 0.
Performance V erification 4–4 1780R-Series Service Manual T able 4–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 21. X Y Input Connector Fifteen-pin, subminiature D-type connec- tor modified to input the audio signal for X Y checks and adjustments.
Performance V erification 1780R-Series Service Manual 4–5 Figure 4–2: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.
Performance V erification 4–6 1780R-Series Service Manual Figure 4–4: RGB Parade Display T est Connector.
Performance V erification 1780R-Series Service Manual 4–7 Short Form Procedure The Short Form Performance Check is provided for those familiar with the complete check procedure, and the Standard Performance Check Procedure is provided for those who need more detailed instructions.
Performance V erification 4–8 1780R-Series Service Manual 23. Check V ertical Overscan 24. Check DC Restorer Shift V ersus Burst 25. Check Filter DC Matching 26. Check Common Mode Rejection 27. Check Differentiated Steps 28. Check Non-Linear W aveform Distortion 29.
Performance V erification 1780R-Series Service Manual 4–9 51. Check V ector Display Clamp Stability and Position Range 52. Check V ector Display V ariable Gain Range 53. Check V ariable Gain Phase Shift 54. Check X and Y Input Phase Matching 55. Check X Y Frequency Response 56.
Performance V erification 4–10 1780R-Series Service Manual Performance Check Procedure This Performance Check Procedure is a continuous sequential procedure. If a step is performed out of sequence, pertinent control settings are given within the step.
Performance V erification 1780R-Series Service Manual 4–1 1 NOTE . Leave the 1780R-Series internal jumpers in their factory-set positions unless dir ected otherwise.
Performance V erification 4–12 1780R-Series Service Manual H Set the 1780R-Series front-panel controls and Configure menu selection to the settings given in T able 4–2. Adjust the controls for best viewing of the display . 1. Check Power Supply Operation Requir ement: .
Performance V erification 1780R-Series Service Manual 4–13 b. Set the V AC output amplitude to 999.9 mV . Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that the correct television standard (NTSC, P AL, or P ALM) is selected.
Performance V erification 4–14 1780R-Series Service Manual i. Check that the CAL readout on the W aveform CR T is 1000 mV ± 2 mV . j. Set the W A VEFORM GAIN–V AR–X5 to Off.
Performance V erification 1780R-Series Service Manual 4–15 b. Select W A VEFORM GAIN–V AR. Check that RIGHT DISPLA Y–WFM and INPUT–CH A are selected. c. Use the VER T POS control to position the waveform backporch or blanking level to the graticule 0 IRE graticule line for NTSC (0.
Performance V erification 4–16 1780R-Series Service Manual Figure 4–7: Identification of marks and divisions on the graticule baseline.
Performance V erification 1780R-Series Service Manual 4–17 6. Check V oltage Cursor Accuracy Requir ement: Accuracy: ± 0.2%. Resolution: 1 mV . a. W ith no signal applied to CH A INPUT , set the fr.
Performance V erification 4–18 1780R-Series Service Manual d. Connect a coaxial cable from the 1780R-Series AUX OUT connector , through a precision (0.2%) 75 W feed-through terminator , to Ch 1 Input on the test oscilloscope. NOTE . The pr ecision terminator is listed under Auxiliary Equipment.
Performance V erification 1780R-Series Service Manual 4–19 l. Remove the four terminators used in part b. of this step and the coaxial cable from the AUX OUT connector to the test oscilloscope. 9. Check Noise Measurements Requir ement: Accuracy: T o 56 dB within 1 dB; 60 dB within 2 dB.
Performance V erification 4–20 1780R-Series Service Manual 1 to 1 ± 0.005 (0.995 to 1.005). Ch A Input to Picture Monitor Output: 1 to 1 ± 0.02 (0.98 to 1.02). a. Connect the V AC output to the 1780R-Series CH A INPUT connector . Do not terminate.
Performance V erification 1780R-Series Service Manual 4–21 r. Move the V AC output signal from the CH B3 INPUT to the CH A INPUT . Connect a coaxial cable from the CH A INPUT loop-through connector to the +Input of the test oscilloscope Differential Comparator .
Performance V erification 4–22 1780R-Series Service Manual ae. Select RELA TIVE on the V ectorscope CR T menu. Press the REF- ERENCE SET button. Note that the D V readout is 100.0% on the W aveform CR T . af. Move the coaxial cable with the 50 W -to-75 W minimum loss attenuator from the CH A INPUT connector to the AUX IN connector .
Performance V erification 1780R-Series Service Manual 4–23 Figure 4–8: T est equipment connections for checking CH A frequency response NOTE . Leave the termination connected to the PIX MON OUT connector for steps 1 1 thr ough 15 unless dir ected otherwise.
Performance V erification 4–24 1780R-Series Service Manual k. Check set the generator to each of the following frequencies: 3.58 MHz (4.43 MHz for P AL), 5 MHz, 8 MHz, and 10 MHz. Use parts i. and j. as a guide for checking the frequency response at each given frequency .
Performance V erification 1780R-Series Service Manual 4–25 a. Connect the leveled sine wave generator output, through a 50 W -to-75 W minimum loss attenuator , to the CH B2 INPUT connector . Do not terminate the loop-through connector . b. Select INPUT–CH B2.
Performance V erification 4–26 1780R-Series Service Manual c. Set the generator output frequency to 50 kHz (reference). Set the generator output amplitude so the W aveform CR T display is exactly 714 mV or 100 IRE for NTSC (or 700 mV for P AL) in amplitude.
Performance V erification 1780R-Series Service Manual 4–27 Figure 4–9: Connections for checking AUX OUT frequency response. (Only Ch 1 of the test oscilloscope dual-trace unit is used.) g. Set the generator to each of these frequencies: 3.58 MHz (4.
Performance V erification 4–28 1780R-Series Service Manual b. Select INPUT–PROBE and WFM HORIZONT AL ONE–FIELD mode of operation. Check that PROBE–X1 is selected on P AGE 2 of the Configure menu. c. Set the generator output frequency to 50 kHz (reference).
Performance V erification 1780R-Series Service Manual 4–29 19. Check Lum/Chroma Gain Ratio Requir ement: X1 Gain Ratio: 1:1 ± 1%; X5 Gain Ratio: ± 0.
Performance V erification 4–30 1780R-Series Service Manual c. Set the generator frequency to 50 kHz (reference). Set the generator output amplitude so the waveform CR T display is exactly 714 mV or 100 IRE in amplitude for NTSC (700 mV for P AL). d.
Performance V erification 1780R-Series Service Manual 4–31 x. Check that the displayed amplitude is equal to or greater than 500 mV or 70 IRE for NTSC (490 mV for P AL). y. Set the generator frequency to 2.68 MHz (3.53 MHz for P AL). z. Check that the displayed amplitude is equal to or less than 500 mV or 70 IRE for NTSC (490 mV for P AL).
Performance V erification 4–32 1780R-Series Service Manual k. Check that the signal blanking level moves less than 3 IRE for NTSC (21 mV for P AL). l. Move the coaxial cable with its terminator from the CH A INPUT connector to the CH B1 INPUT connector .
Performance V erification 1780R-Series Service Manual 4–33 c. Set the 1780R-Series WFM HORIZONT AL buttons to TWO–LINE. d. Press the CONFIGURE button to On.
Performance V erification 4–34 1780R-Series Service Manual b. Set the generator Luminance button to On (pressed in). c. Set the 1780R-Series controls as follows: INPUT to CH A, WFM HORIZONT AL to ONE–LINE, MAGNIFIER to 1.0 m s/DIV , and W A VEFORM GAIN to X5.
Performance V erification 1780R-Series Service Manual 4–35 25. Check Filter DC Matching Supplemental: (not listed in Section 2); Matching: W ithin 10 IRE for NTSC (70 mV for P AL). a. Check that a Pulse & Bar signal is applied to the 1780R-Series CH A INPUT connector .
Performance V erification 4–36 1780R-Series Service Manual e. Set the 1780R-Series controls as follows: INPUT to AB1 and W A VE- FORM GAIN to X5. f. Check that the amplitude is 3.5 IRE or less for NTSC (25 mV for NTSC or P AL) as displayed on the W aveform CR T .
Performance V erification 1780R-Series Service Manual 4–37 button to CH B1 when setting the display reference amplitude and then select INPUT B1B3 to check common mode rejection). u. Disconnect the dual-input coupler and the sine wave signal from the instrument.
Performance V erification 4–38 1780R-Series Service Manual a. Check that a 5-Step, 40 IRE Modulated Staircase signal is applied to the 1780R-Series CH A INPUT connector .
Performance V erification 1780R-Series Service Manual 4–39 d. Check that the 2T pulse amplitude is 1 IRE or less for NTSC (7 mV for P AL) than the 2T bar amplitude. e. Check that the 2T bar tilts 1 IRE or less for NTSC (7 mV for P AL). f. Change the generator output signal to Field Square W ave.
Performance V erification 4–40 1780R-Series Service Manual l. Disconnect the V AC signal from the PROBE input connector . 31. Check Calibrator Output V oltage for Probe Requir ement: CAL OUT V oltage: 1.0 V ± 0.5%. a. Connect the BNC connector end of a 1X probe to the 1780R-Series PROBE input connector .
Performance V erification 1780R-Series Service Manual 4–41 32. Check Probe T ilt and Non-Linear Distortion Requir ement: Tilt: Less than 5% on a 50 Hz square wave (less than 4% when using a 60 Hz square wave).
Performance V erification 4–42 1780R-Series Service Manual h. Select CURSOR 1 on the W aveform CR T . i. T urn the Precision Measurement knob so that CURSOR 1 bright-up spot overlays CURSOR 2 bright-up spot. j. Check that the D T readout on the W aveform CR T is between 63.
Performance V erification 1780R-Series Service Manual 4–43 c. Use the 1780R-Series VER T POS and HORIZ POS controls to position the trace on the graticule baseline so that it starts at the first major graticule mark (located at the start or left end of the baseline) on the W aveform CR T .
Performance V erification 4–44 1780R-Series Service Manual n. Set the TIME CURSORS button to Off and the MAGNIFIER to OFF . 35. Check V ariable Sweep Range Requir ement: Range: > ± 20%. a. Connect the television test signal generator Color Bar signal through a 75 W feed-through terminator to the 1780R-Series CH A INPUT connector .
Performance V erification 1780R-Series Service Manual 4–45 c. Rotate the Precision Measurement control to select Line 263 for the 1780R NTSC instrument. For P AL, go to parts e. and f. d. Check that there is a one-half color display line located on the left side of the W aveform CR T screen.
Performance V erification 4–46 1780R-Series Service Manual h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 0 V to +10 V square waves as displayed on the test oscilloscope CR T .
Performance V erification 1780R-Series Service Manual 4–47 c. Check and/or set the 1780R-Series controls as follows: LEFT DIS- PLA Y–VECT , RIGHT DISPLA Y–WFM, REF–EXT , and WFM HORIZONT AL ONE–LINE. d. Press the MEASURE button to On. Select DIFF GAIN, SINGLE, and NOISE REDUCTION–OFF on the V ectorscope CR T menu.
Performance V erification 4–48 1780R-Series Service Manual t. Select SINGLE and NOISE REDUCTION–OFF on the V ectorscope CR T menu. Press the MEASURE button to exit the menu.
Performance V erification 1780R-Series Service Manual 4–49 o. Leave the MEASURE button set to On. p. Leave the 5-Step Staircase test signal from the CH A INPUT connector . 41. Check Recursive Filter SUPPLEMENT Approximately 15 dB signal-to-noise reduction with filter selected.
Performance V erification 4–50 1780R-Series Service Manual e. Set the television test signal generator V ariable Sync to On. Adjust the V ariable Sync control to obtain minimum output amplitude (14 dB reduction; i.e., <8 IRE amplitude for NTSC; <57 mV for P AL).
Performance V erification 1780R-Series Service Manual 4–51 a. Check that the television test signal generator Color Bar signal is applied to the 1780R-Series CH A INPUT connector . Check that the generator Black Burst signal is applied to the EXT REF connector and this connector is terminated into 75 W .
Performance V erification 4–52 1780R-Series Service Manual b. Select REF–INT on the 1780R-Series front panel. Adjust the generator Linearity Rate control so the signal bounce rate is approximately two seconds. c. Set the 1780R-Series V AR/SLOW button to SLOW .
Performance V erification 1780R-Series Service Manual 4–53 e. Disconnect the Remote Sync Input Connector from the instrument. Leave the Color Bar signal connected to CH A INPUT . 47. Check Digital Phase Shifter Requir ement: Phase Accuracy: 0.1 _ . a.
Performance V erification 4–54 1780R-Series Service Manual o. T urn the Subcarrier dial on the television test signal generator to place the red vector dot on the 210 _ graticule line on the 1780R-Series V ectorscope CR T . T urn the 1780R-Series Precision Measurement control to reposition the red vector dot back to the 180 _ graticule line.
Performance V erification 1780R-Series Service Manual 4–55 Figure 4–10: V ector graticule showing the –3 dB points for checking frequency response f. Set the generator output frequency to 2.979545 MHz for NTSC (3.833619 MHz for P AL). g. Check that the circle displayed on the V ectorscope CR T is smaller than the 3 dB marks.
Performance V erification 4–56 1780R-Series Service Manual d. Check that the color vector dots are located within 50% of the distance between the center of the boxes and edges of the boxes. e. Check that the button under the V ectorscope CR T is On.
Performance V erification 1780R-Series Service Manual 4–57 f. Set the test oscilloscope dual trace amplifier controls as follows: Ch 1 V olts/Div to 0.1 V , Input Coupling to DC, Display Mode to Ch 1, and the T rigger Source to Ch 1. Set the Time Base controls as follows: Mode to Auto, Coupling to DC, Source to Int, and the T ime/ Div to 1 m s.
Performance V erification 4–58 1780R-Series Service Manual v. Move the Color Bar signal to the CH B3 INPUT connector and terminate into 75 W . Select INPUT–CH B3. w. Check Use parts p. through s. as a guide for checking CH B3. x. Set the VECTOR GAIN–V AR to Of f.
Performance V erification 1780R-Series Service Manual 4–59 d. Set the 1780R-Series VECTOR GAIN to V AR. T urn the variable VECTOR GAIN control counterclockwise until the circle is its smallest size. e. Note the amplitude of the display on the W aveform CR T .
Performance V erification 4–60 1780R-Series Service Manual h. Adjust the variable VECTOR GAIN control so that the burst vector length reaches the 20% DG mark on the 180 _ graticule line. i. T urn the Precision Measurement control to null the burst. j.
Performance V erification 1780R-Series Service Manual 4–61 Figure 4–1 1: Properly adjusted xy input gains 55. Check X Y Frequency Response Requir ement: Frequency Response: DC to >500 kHz. a. Connect the leveled sine wave generator output signal to pin 3 of the 1780R-Series rear panel X Y INPUT connector .
Performance V erification 4–62 1780R-Series Service Manual NOTE . Perform parts i. thr ough o. of this step only if the internal jumpers for A6J108 and A6J205 ar e installed to operate the instrument in the High Gain mode. i. Connect the sine wave oscillator to pin 1 1 and ground pin 9 of the X Y INPUT connector .
Performance V erification 1780R-Series Service Manual 4–63 e. Check that the SCH dot is located near the compass rose and that it is within 5 _ of the 180 _ axis for NTSC or P AL. f. Connect the Frame/Black (NTSC) or Frame Ref (P AL) signal from the television generator to the CH 1 Input to the test scope dual trace amplifier .
Performance V erification 4–64 1780R-Series Service Manual Check that the generator is internally connected so that the SCH can be varied. (Refer to P339 on the generator A21 Sync Lock board.) l. Check that by turning the generator Subcarrier Phase control clockwise, the SCH dot “flips” between 80 _ and 1 15 _ (typical range).
Performance V erification 1780R-Series Service Manual 4–65 e. T urn the Precision Measurement control so that the waveform blanking level is aligned parallel with the CR T graticule baseline (0 IRE for NTSC; 0.3 V for P AL). The electronic graticule horizontal line will also be parallel with its nearest CR T graticule line.
Performance V erification 4–66 1780R-Series Service Manual Figure 4–13: Setting up the Return Loss Bridge: a) setup 500 mV amplitude; b) Nulling the bridge NOTE .
Performance V erification 1780R-Series Service Manual 4–67 Figure 4–14: Measuring return loss of 1780R-Series CH A INPUT f. Check that the return loss of the CH A INPUT is better than 40 dB for a frequency range from 50 kHz (reference) to 5 MHz. Make this check, within this frequency range, with instrument power on and off.
Performance V erification 4–68 1780R-Series Service Manual.
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1780R-Series Service Manual 5–1 Adjustment Procedures This section of the 1780R-Series Service Manual consists of an Adjustment Procedure. The Performance V erification is used to evaluate operation of the instrument as specified in the Performance Requirements in Specifications .
Adjustment Procedures 5–2 1780R-Series Service Manual Figure 5–1: Simplified representation of the 1780R-Series Video Measurement Set, showing the location of the four control groups The Precision Measurement Control is multifunctional. Its function is assigned either by the accompanying switches or through one of the CR T displayed menus.
Adjustment Procedures 1780R-Series Service Manual 5–3 The <> switches below the Precision Measurement Control knob duplicate its function, allowing a single increment of change per push. The instrument is made up of a number of etched circuit boards.
Adjustment Procedures 5–4 1780R-Series Service Manual Recommended Equipment List T able 5–1: Recommended Equipment Electrical Instrument Performance Requirements Example Electrical Instruments 1. T est Oscilloscope V ertical Amplifier Differential Comparator with 30 MHz bandwidth and 1 mV sensitivity .
Adjustment Procedures 1780R-Series Service Manual 5–5 T able 5–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements 5. Leveled Sine W ave Generator Flatness 1%, 250 kHz to 50 MHz. The flatness can be characterized (a chart made of variations) with the TEKTRONIX Peak-to-Peak Detector (015-0408-00).
Adjustment Procedures 5–6 1780R-Series Service Manual T able 5–1: Recommended Equipment (Cont.) Electrical Instrument Example Performance Requirements Auxiliary Equipment 14. 75 W T erminators Five required, three must be a feed- through type. T wo 75 W End-line T erminators (T ektronix Part No.
Adjustment Procedures 1780R-Series Service Manual 5–7 Figure 5–4: Rear view of the X Y plug connections. (Pins 2, 4, 6, 10, 12, and 14 can be used to make ground connections.
Adjustment Procedures 5–8 1780R-Series Service Manual Adjustment List T able 5–2 lists all of the adjustments by step number sequence. This table can be used as a short form adjustment procedure for those who are familiar with the adjustment procedure for the 1780R-Series.
Adjustment Procedures 1780R-Series Service Manual 5–9 T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 14 Cal Gain A2 R1 137 .
Adjustment Procedures 5–10 1780R-Series Service Manual T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 33 H Mag Reg A2 R344 .
Adjustment Procedures 1780R-Series Service Manual 5–1 1 T able 5–2: 1780R-Series Adjustments for Calibration Procedure (Cont.) Step # Diag # Circuit Number A # Adjustment Name 42 RGB/YRGB Staircas.
Adjustment Procedures 5–12 1780R-Series Service Manual Procedure This Adjustment Procedure is a continuous sequential procedure. If a step is performed out of sequence, pertinent control settings are given within the step.
Adjustment Procedures 1780R-Series Service Manual 5–13 1. Equipment Connections a. Connect the television test signal generator Color Bar signal, through a 75 W feed-through terminator , to the 1780R-Series CH A INPUT connector . See Figure 5–6. Figure 5–6: Initial signal connections for re-adjustment of the 1780R-Series b.
Adjustment Procedures 5–14 1780R-Series Service Manual f. Set the PHASE SHIFT button to Off, the CALIBRA TE button to On, and the button below the V ectorscope CR T to On. g. Use the Precision Measurement control to adjust for desired V ectorscope CR T readout intensity .
Adjustment Procedures 1780R-Series Service Manual 5–15 Figure 5–7: Adjustment and test point locations on the W aveform HV Supply circuit board (Assembly 16.) NOTE . The +5 V supply is the r eference supply for the instrument. If it is adjusted, the entir e instrument will need to be recalibrated.
Adjustment Procedures 5–16 1780R-Series Service Manual <HORIZ POS POT> Select <CONTINUOUS>. This indicates that the instrument has a continuous Horizontal Position control (dual wiper potentiometer). <TC ON VC IN LS> Select <ENABLE>.
Adjustment Procedures 1780R-Series Service Manual 5–17 d. Set the 1780R-Series front-panel SCALE and INTENSITY controls for normal brightness. Figure 5–8: Adjustment locations on the V ectorscope HV Supply circuit board (Assembly A3) 7. Adjust V ector Astigmatism and Focus a.
Adjustment Procedures 5–18 1780R-Series Service Manual Figure 5–9: Adjustment locations on the Microprocessor circuit board (Assembly A5) e. Press the CALIBRA TE button. Select VOL T AGE CURSORS ZERO SET on the V ectorscope CR T menu. f. Use the VER T POS control to center the nulled cursors on the W aveform CR T .
Adjustment Procedures 1780R-Series Service Manual 5–19 Figure 5–10: W aveform circuit board (Assembly A2) adjustment, test point, and jumper locations.
Adjustment Procedures 5–20 1780R-Series Service Manual q. Select RIGHT DISPLA Y -WFM mode. Press the CONFIGURE button to On and select COUPLING-DC on P AGE 1. Press the CONFIGURE button to exit the menu. r. Disconnect the DMM test leads from A2U810.
Adjustment Procedures 1780R-Series Service Manual 5–21 11 . Adjust V ector CR T T race Rotation, Orthogonality , and Geometry a. Press the button under the V ectorscope CR T to On. b. T ouch the TRACE ROT A TION pad on the W aveform CR T . Be sure that the circle surrounds the words TRACE ROT A TION.
Adjustment Procedures 5–22 1780R-Series Service Manual d. Press the CALIBRA TE button to exit the menu. 13. Adjust Picture Monitor a. Set 1780R-Series INPUT selection to CH A.
Adjustment Procedures 1780R-Series Service Manual 5–23 d. Set the V AC for a 999.9 mV output amplitude. Check that the +Lum button is pressed in and the Lum/Sync button is out. Check that the correct television standard (NTSC, P AL, or P AL-M) is selected.
Adjustment Procedures 5–24 1780R-Series Service Manual remain lit but not the A-B1 selection.) The display should become a nearly flat trace and the left CR T should display the messages: g.
Adjustment Procedures 1780R-Series Service Manual 5–25 Figure 5–13: Input & BNC circuit board (A8) adjustments, shown as they would appear with the instrument on its left side 17. Match Input Gains a. Connect the V AC output cable to a dual input coupler .
Adjustment Procedures 5–26 1780R-Series Service Manual Figure 5–14: T est equipment connections for matching CH A and CH B1 input gains. j. Move the side of the dual input coupler from the 1780R-Series CH B2 INPUT to the CH B3 INPUT . k. Select 1780R-Series B1-B3 INPUT .
Adjustment Procedures 1780R-Series Service Manual 5–27 NOTE . T o eliminate generator signal DC level error , if pr esent, when performing parts e. thr ough h. of this step, select COUPLING-GND on P AGE 1 of the Configur e menu. Use the VERT POS control to position the trace to the W aveform CRT graticule baseline.
Adjustment Procedures 5–28 1780R-Series Service Manual e. Adjust V ar Gain Centering (A2R514) for a Calibrator signal amplitude of 65 IRE for NTSC (or 450 mV for either NTSC or P AL). f. Press the CONFIGURE button and select COUPLING-DC. g. For NTSC only: Check that ABS UNITS-mV is selected on P AGE 2.
Adjustment Procedures 1780R-Series Service Manual 5–29 e. Check that the V oltage Cursors menu on the V ectorscope CR T indicates that ABSOLUTE and SEP ARA TE are selected. If not, make this selection. f. Use the Precision Measurement control to overlay CURSOR 1 trace on the calibrator upper trace.
Adjustment Procedures 5–30 1780R-Series Service Manual NOTE . T ypically , A2R612 is set fully counter clockwise and A2R418 is set fully clockwise. A2R534 is set nearly fully clockwise. f. Set the W A VEFORM GAIN to X5. g. Set the generator multiburst frequency range to Low .
Adjustment Procedures 1780R-Series Service Manual 5–31 Figure 5–15: T est equipment connections for adjusting CH A frequency response t. Adjust A2C527 for 100 IRE (700 mV for P AL) signal amplitude on the W aveform CR T . u. Recheck the amplitudes at 3.
Adjustment Procedures 5–32 1780R-Series Service Manual NOTE . Repeat parts v . thr ough y . of this step, as necessary , to obtain the fr equency response described. z. Adjust the generator frequency and check for a decreased amplitude of 1% to 3% at 15 MHz, and 4%to 7% at 20 MHz.
Adjustment Procedures 1780R-Series Service Manual 5–33 c. Select the following 1780R-Series settings: INPUT A-B1, W A VEFORM HORIZONT AL-ONE-FIELD, and W A VEFORM GAIN-X5-On. NOTE . Do not turn the CMR adjustments given in parts d., g., and j. of this step if chr ominance nulls within 14 IRE for NTSC (100 mV for P AL).
Adjustment Procedures 5–34 1780R-Series Service Manual amplitude so the W aveform CR T display is 100 IRE (700 mV for P AL) in amplitude. f. Adjust the peak-to-peak detector amplifier +Level control to turn on the green light. Note the DMM reading. g.
Adjustment Procedures 1780R-Series Service Manual 5–35 e. Disconnect the equipment from CH B3 INPUT . f. Disconnect the termination from the PIX MON OUT connector . 27. Adjust Luminance Filter T ransient Response (Chroma Rejection) a. Connect a Color Bar signal to the 1780R-Series CH A INPUT .
Adjustment Procedures 5–36 1780R-Series Service Manual c. Set the leveled sine wave generator output frequency to 3.58 MHz (4.43 MHz for P AL) and its output amplitude to 100 IRE for NTSC (700 mV for P AL). d. Select FIL TER-CHROM mode. Check that WFM HORIZONT AL-ONE- LINE is selected.
Adjustment Procedures 1780R-Series Service Manual 5–37 p. Check that FIL TER-CHROM and ONE-LINE are still selected. q. Set the television test signal generator for Horizontal Unlock. r. Use the 1780R VER T POS and HORIZ POS to center the green-magenta transition on the W aveform CR T .
Adjustment Procedures 5–38 1780R-Series Service Manual j. Select the FIL TER-FLA T mode. Select COUPLING-DC on the Configure menu. Press the CONFIGURE button to exit the menu. 32. Adjust Horizontal T iming NOTE . Perform Step 39, Adjust T iming Cursors, befor e checking and adjusting horizontal timing.
Adjustment Procedures 1780R-Series Service Manual 5–39 k. Adjust the Precision Measurement control so that the CURSOR 1 and CURSOR 2 dots are exactly 10 divisions apart (The bright-up dots should coincide with the 2nd and 12th major graticule marks when the D T readout is exactly 100.
Adjustment Procedures 5–40 1780R-Series Service Manual d. Use the HORIZ POS control to position the center of the vertical sync to the mid-screen graticule mark. e. Set the WFM HORIZONT AL-MAGNIFIER to OFF . f. Adjust H Mag Reg (A2R344) to center the vertical sync on the screen.
Adjustment Procedures 1780R-Series Service Manual 5–41 V ariable resistors are shown rotated 90 _ from the way they are mounted on the assembly; variable resistors are adjustable from the top of the circuit board. Figure 5–16: Adjustment and test point (TP) locations for the Oscillator circuit board (Assembly A7).
Adjustment Procedures 5–42 1780R-Series Service Manual m. Adjust DC Balance (A7R286) so that the NTSC demodulated burst pulse overlays the demodulated baseline as displayed on the test oscilloscope. (For P AL, there are two bursts. Adjust the burst that will null.
Adjustment Procedures 1780R-Series Service Manual 5–43 l. Use the variable VECTOR GAIN control to place the burst vector dot(s) to the graticule reference 75% mark(s). If necessary , use the VER T and HORIZ POS controls to center the vector display center dot.
Adjustment Procedures 5–44 1780R-Series Service Manual ab. Note the exact phase position of the burst vector(s) for use as a reference. NOTE . The fr ont-panel variable VECTOR GAIN contr ol can be used to move the burst vector to the compass r ose while performing parts bb.
Adjustment Procedures 1780R-Series Service Manual 5–45 d. Set the VECTOR GAIN to V AR. e. Move the subcarrier vector to the V ectorscope CR T compass rose using the variable VECTOR GAIN control. f. Connect the 10X probe from the test oscilloscope to A6TP379 on the V ectorscope board.
Adjustment Procedures 5–46 1780R-Series Service Manual NOTE . Repeat parts p. thr ough t. of this step, if necessary , for pr oper deflection. u. T ouch the GO TO DIFF GAIN pad on the V ectorscope CR T . Check that SINGLE is selected. Use the variable VECTOR GAIN control to position the burst vector to the CR T compass rose.
Adjustment Procedures 1780R-Series Service Manual 5–47 ah. T ouch the GO TO DIFF PHASE pad on the V ectorscope CR T . Check that DOUBLE is selected. ai. Press the button located below the left CR T . Use the VER T and HORIZ POS controls to position the vector center dot to the center of the V ectorscope CR T .
Adjustment Procedures 5–48 1780R-Series Service Manual Figure 5–18: Noise Reduction-OFF . Demod offset properly adjusted 38. Adjust SCH Phase a. Connect a Color Bar signal from a TEKTRONIX TSG-170A NTSC T elevision Generator to the 1780R CH A INPUT connector .
Adjustment Procedures 1780R-Series Service Manual 5–49 –Slope and Normal mode triggering. (For P AL, set the time base to 20 m s/Div .) g. Check that the 1780R-Series WFM HORIZONT AL-ONE-LINE (or TWO-LINE) is selected. Press the LINE SELECT button to On.
Adjustment Procedures 5–50 1780R-Series Service Manual r. If necessary , move the jumper on A2J986 so the SCH dot is closest to the burst vector reference line as displayed on the V ectorscope CR T . (That is, close to the 0 _ mark on the graticule d Q scale.
Adjustment Procedures 1780R-Series Service Manual 5–51 Figure 5–19: Z-Axis circuit board (A4) adjustment and test point locations e. Disconnect the probe from A4TP108. f. Connect a 10X probe from the test oscilloscope vertical input to A4TP100. Set the test oscilloscope vertical deflection factor to 2 V/ Div and the sweep rate to 2 ms/Div .
Adjustment Procedures 5–52 1780R-Series Service Manual a. Connect a Pulse & Bar signal from a TEKTRONIX TSG170A NTSC T elevision Generator to the 1780R CH A INPUT connector . (For the 1781R, use the TSG271 P AL Generator .) b. Select REF-INT on the 1780R-Series front panel.
Adjustment Procedures 1780R-Series Service Manual 5–53 Figure 5–20: V ector graticule x- and y-axis markings for adjusting xy input gains f. Move the generator output connections to pin 5 (–Y) and pin 7 (+Y) on the XY Input connector .
Adjustment Procedures 5–54 1780R-Series Service Manual Figure 5–21: Properly adjusted xy input gains 42. Adjust RGB/YRGB a. Connect a Color Bar signal from the television test signal generator , through a 75 W feed-through terminator , to the 1780R-Series CH A INPUT .
Adjustment Procedures 1780R-Series Service Manual 5–55 h. Connect the output of the function generator to the test oscilloscope vertical amplifier input. Set the generator controls for 1 kHz, 0 V to +10 V , square waves as displayed on the test oscilloscope CR T .
Adjustment Procedures 5–56 1780R-Series Service Manual j. Press the LINE SELECT button to turn it off. If necessary , readjust the INTENSITY and FOCUS controls for best readout and trace definition. k. Disconnect the Color Bar signal from the CH A INPUT .
Adjustment Procedures 1780R-Series Service Manual 5–57 e. Adjust Probe Calibrator Amplitude (A6R795) to obtain a null on the test oscilloscope CR T display . f. Disconnect the test oscilloscope from the V AC and the 1X probe from the 1780R-Series CAL OUT connector .
Adjustment Procedures 5–58 1780R-Series Service Manual h. Disconnect the Pulse & Bar signal from the front-panel PROBE input connector . 47. Adjust Probe Frequency Response a. Connect the television test signal generator Multiburst signal, through a 75 W feed-through terminator , to the 1780R-Series front-panel PROBE input connector .
Adjustment Procedures 1780R-Series Service Manual 5–59 o. Set the generator output frequency to 3.58 MHz (4.43 MHz for P AL), 5 MHz, 8 MHz, and then to 10 MHz. p. Check that the displayed amplitude on the W aveform CR T is within ± 3% or ± 21.4 mV for NTSC ( ± 21.
Adjustment Procedures 5–60 1780R-Series Service Manual.
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1780R-Series Service Manual 6–1 Preventive Maintenance Preventive maintenance consists of cleaning, visual inspection, performance checks, and (if needed) readjustment. The preventive maintenance schedule established for the instrument should be based on the amount of use it receives and the environment in which it is operated.
Preventive Maintenance 6–2 1780R-Series Service Manual The instrument should be cleaned often enough to prevent dust and dirt from accumulating. Dirt acts as a thermal insulator , preventing effective heat dissipation, and can also provide high-resistance electrical leakage paths between conductors or components in a humid environment.
1780R-Series Service Manual 6–3 Static-Sensitive Components This instrument contains electrical components that are susceptible to damage from static discharge. Static voltages from 1 kV to 30 kV are common in unprotected environments. T able 6–1 shows the relative static discharge susceptibility of various semiconductor classes.
Static-Sensitive Components 6–4 1780R-Series Service Manual 7. Do not slide components over any surface. 8. A void handling components in areas that have a floor or work surface covering capable of generating a static charge. 9. Use a soldering iron that is connected to earth ground.
1780R-Series Service Manual 6–5 Corrective Maintenance CAUTION. A 2% RMA flux content solder is r ecommended for making repairs in this instrument. Cleaning of r osin residue is not r ecommended. Most cleaning solvents tend to r eactivate the rosin and spr ead it under components wher e it may cause corr osion under humid conditions.
Corrective Maintenance 6–6 1780R-Series Service Manual Mechanical Disassembly/Assembly Use these instructions for disassembly and then reverse them for reassembly , unless noted otherwise.
Corrective Maintenance 1780R-Series Service Manual 6–7 Use the following procedure to replace the graticule lights. 1. Remove the SCALE, FOCUS, INTENSITY , VER T POS, and HORIZ POS knobs by loosening their set screws. 2. Use pliers to grip the CR T Panel protrusion where the SCALE control shaft is located.
Corrective Maintenance 6–8 1780R-Series Service Manual Use the following procedure to remove the instrument from the cabinet or case. 1. Check that the power cord is disconnected. Disconnect all the coaxial cables from the rear-panel BNC connectors.
Corrective Maintenance 1780R-Series Service Manual 6–9 Figure 6–2: Positions of the waveform CRT deflection leads 6. For the CR T being removed: Disconnect the appropriate Trace Rotation connector from the Interconnect board (A1 1). For the waveform CR T , the connector is J165; for the vectorscope CR T , the connector is J143 on A1 1.
Corrective Maintenance 6–10 1780R-Series Service Manual Use the following procedure to replace the CR T . 1. Slide the CR T partially into position so the CR T base pins will align with the socket. Push the socket into position onto the CR T pins. CAUTION.
Corrective Maintenance 1780R-Series Service Manual 6–1 1 6. Clean the face of the CR T to remove fingerprints. 7. Reconnect the PROBE connector to J498 on the V ectorscope board (A6). Install the parts removed in steps 1 through 4 of the CR T Removal proce- dure.
Corrective Maintenance 6–12 1780R-Series Service Manual Use the following procedure to remove the W aveform HV Supply board. 1. Remove the two screws that hold the clear plastic cover in position. 2. Remove the two 1/4-inch hex-shaped posts. W ARNING.
Corrective Maintenance 1780R-Series Service Manual 6–13 Use the following procedure to remove the L V Power Supply board. 1. Remove the MPU Annex (A10), W aveform HV Supply (A16), and the Fuse (A17) boards using the procedures given previously . 2. Remove the screws and one nut that hold the large and small metal shields in place.
Corrective Maintenance 6–14 1780R-Series Service Manual 7. T o re-assemble, reverse the procedure. Use the following procedure to remove the Oscillator board. 1. Unsolder the ground and center conductor wires from the EXT CW REF rear-panel BNC connector .
1780R-Series Service Manual 6–15 T roubleshooting Since this manual is a troubleshooting aid, its organization is described here. This material is general, and does not cover specific cases. T roubleshooting Aids The foldout pages at the back of the manual contain block and schematic diagrams, circuit board illustrations, and look-up charts.
T roubleshooting 6–16 1780R-Series Service Manual Look Up Charts. Each schematic diagram is assigned an alpha-numeric grid and a look-up chart which lists the grid location of components on that schematic.
T roubleshooting 1780R-Series Service Manual 6–17 Assembly and Circuit Numbering. All circuit board assemblies are assigned assembly or “A” numbers. T able 6–3 and Figure 6–5 show the assembly numbers and their locations for this instrument.
T roubleshooting 6–18 1780R-Series Service Manual Figure 6–5: 1780R-Series circuit board assembly locations.
T roubleshooting 1780R-Series Service Manual 6–19 General T roubleshooting T echniques 1. Be sure the instrument is malfunctioning. See Section 2 to determine whether the instrument is operating properly . Check the operation of front-panel controls, associated equipment, and input signal connections.
T roubleshooting 6–20 1780R-Series Service Manual.
1780R-Series Service Manual 6–21 T roubleshooting Procedures Board Accessibility Servicing some circuit assemblies in this instrument requires removal of other components (shields, cables, circuit boards, etc.). Some procedures call out special equipment such as cable extenders or external power supplies.
T roubleshooting Procedures 6–22 1780R-Series Service Manual W ARNING. Danger ous potentials exist on the L V Power Supply boar d. Use car e when tr oubleshooting to prevent personal injury . Read the instructions given in the T r oubleshooting portion of this section.
T roubleshooting Procedures 1780R-Series Service Manual 6–23 DC Power Supply: V ariable voltage supply , 0–20 V DC at 1A. For example: A TEKTRONIX PS 503A Power Supply . (Requires a TM500-Series mainframe.) Isolation T ransformer: For example: Stancor GIS 1000.
T roubleshooting Procedures 6–24 1780R-Series Service Manual 5. Slowly increase DC power supply voltage. At about 16 V U460 turns on and the base of the Switcher (Q250) has a waveform with a 90% duty cycle, 5 V peak-to-peak amplitude (+1 V to –4 V), and a 20 m s period.
T roubleshooting Procedures 1780R-Series Service Manual 6–25 13. Set the V ariac to 40 V . Adjust the external DC supply for 18 V . 14. Use the test oscilloscope to check the waveform on the base of Q460 has approximately 20% duty cycle and a period of about 4 m s.
T roubleshooting Procedures 6–26 1780R-Series Service Manual D. U460 pin 3 E. U460 pin 4 23. Connect the test oscilloscope probe to the emitter of Q250. W ith the variac set to 1 10 V , temporarily short the +5 V supply to ground, and check that the voltage on Q250 does not rise above 1.
T roubleshooting Procedures 1780R-Series Service Manual 6–27 Figure 6–8: A. Q250 collector waveform. B. Q250 base waveform. C. Q350–Q451 emitter waveform. D. U460 pin 3 waveform. E. U460 pin 4 waveform 24. Install a plug jumper on J122. Connect the test oscilloscope probe to the +5 V supply .
T roubleshooting Procedures 6–28 1780R-Series Service Manual Figure 6–9: +5 V supply output waveform when over voltage protection is operating Current Limit Adjustment (A1R466) V ariable Auto T ransformer: See Equipment Required List in the Adjustment Procedures section.
T roubleshooting Procedures 1780R-Series Service Manual 6–29 4. Set the 1780R-Series instrument POWER switch to ON. 5. Set the 1780R-Series front-panel controls for best viewing of the color bar vectors on the V ectorscope CR T and of the waveform displayed on the W aveform CR T .
T roubleshooting Procedures 6–30 1780R-Series Service Manual T ouch Panel Sensitivity Adjustment (A9R292) T est Oscilloscope: See Equipment Required List for the Performance Verification or Adjustment Procedures. 1. Check that the 1780R-Series instrument POWER switch is set to OFF (ST ANDBY).
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1780R-Series Service Manual 7–1 Options CRT Options The standard instrument is shipped with a P31 (green) phosphor CR T s installed. If Option 74 is ordered, the instrument is shipped with P4 (white) phosphor CR T s installed. The Option 74 CR T part numbers are given at the end of the Replaceable Electrical Parts List.
Options 7–2 1780R-Series Service Manual.
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1780R-Series Service Manual 8–1 Replaceable Electrical Parts This section contains a list of the electrical components for the <instrument>. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local T ektronix field office or representative.
Replaceable Electrical Parts 8–2 1780R-Series Service Manual Parts list column descriptions Column Column name Description 1 Component number The component number appears on diagrams and circuit board illustrations, located in the diagrams section.
Replaceable Electrical Parts 1780R-Series Service Manual 8–3 Manufacturers cross index Mfr . code Manufacturer Address City , state, zip code 00779 AMP INC.
Replaceable Electrical Parts 8–4 1780R-Series Service Manual Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 12954 MICROSEMI CORP – SCOTTSDALE 8700 E THOMA.
Replaceable Electrical Parts 1780R-Series Service Manual 8–5 Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 33095 SPECTRUM CONTROL INC 8061 A VONIA RD FAIRV.
Replaceable Electrical Parts 8–6 1780R-Series Service Manual Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer 62703 MICRO QUALITY SEMICONDUCTOR 1000 N SHILOH .
Replaceable Electrical Parts 1780R-Series Service Manual 8–7 Manufacturers cross index (cont.) Mfr . code City , state, zip code Address Manufacturer TK2601 MAXTEK COMPONENTS CORPORA TION 13335 SW T.
Replaceable Electrical Parts 8–8 1780R-Series Service Manual Replaceable electrical parts list Component number T ektronix part number Serial no. effective Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–9 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–10 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1C462 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 1 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–12 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1L420 108–1520–00 INDUCTOR,FXD:POWER,47UH,10%,I<1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–13 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–14 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1R223 322–3001–00 RES,FXD,FILM:10 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–15 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1S250 260–2485–00 SWITCH,THRMSTC:SPST ,NC,OPEN 80.
Replaceable Electrical Parts 8–16 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1W520 131–0566–00 BUS,CONDUCT OR:DUMMY RES,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–17 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–18 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C414 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–19 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C651 283–0189–00 CAP ,FXD,CER DI:0.
Replaceable Electrical Parts 8–20 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2C842 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–21 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–22 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–23 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–24 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–25 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–26 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2CR1 142 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A,1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–27 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–28 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2J1203 131–4752–00 CONN,HDR::PCB,MALE,45 DEG,1 X 2,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–29 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2L1350 108–0317–00 INDUCTOR,FXD:CUST OM,POWER,15UH,10%,IDC<460 MA,RDC<1.
Replaceable Electrical Parts 8–30 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–31 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–32 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–33 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–34 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–35 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–36 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R281 322–3318–00 RES,FXD,FILM:MET AL FILM,20K OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–37 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R374 322–3487–00 RES,FXD,FILM:500 OHM,1%,0.
Replaceable Electrical Parts 8–38 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R425 322–31 14–00 RES,FXD,FILM:150 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–39 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R487 322–3300–00 RES,FXD,FILM:13K OHM,1%,0.
Replaceable Electrical Parts 8–40 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R536 31 1–2239–00 RES,V AR,TRMR:CERMET ,100K OHM,20%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–41 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R610 322–3310–00 RES,FXD,FILM:16.
Replaceable Electrical Parts 8–42 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R665 322–3254–00 RES,FXD,FILM:4.
Replaceable Electrical Parts 1780R-Series Service Manual 8–43 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R727 322–3335–00 RES,FXD,FILM:30.
Replaceable Electrical Parts 8–44 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R818 322–3356–00 RES,FXD,FILM:49.
Replaceable Electrical Parts 1780R-Series Service Manual 8–45 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R912 322–3485–07 RES,FXD,FILM:5K OHM,0.
Replaceable Electrical Parts 8–46 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R985 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–47 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1037 322–3147–00 RES,FXD,FILM:332 OHM,1%,0.
Replaceable Electrical Parts 8–48 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1 1 17 322–3226–00 RES,FXD:MET AL FILM,2.
Replaceable Electrical Parts 1780R-Series Service Manual 8–49 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1 178 322–3306–00 RES,FXD:MET AL FILM,15K OHM,1%,0.
Replaceable Electrical Parts 8–50 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1252 322–3258–00 RES,FXD:MET AL FILM,4.
Replaceable Electrical Parts 1780R-Series Service Manual 8–51 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1312 322–3243–00 RES,FXD:MET AL FILM,3.
Replaceable Electrical Parts 8–52 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1357 322–3385–00 RES,FXD:MET AL FILM,100K OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–53 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1417 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.
Replaceable Electrical Parts 8–54 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1476 322–3258–00 RES,FXD:MET AL FILM,4.
Replaceable Electrical Parts 1780R-Series Service Manual 8–55 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2R1578 322–3097–00 RES,FXD,FILM:100 OHM,1%,0.
Replaceable Electrical Parts 8–56 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2TP1273 214–4085–00 TERM,TEST POINT :0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–57 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U565 156–2460–00 ICSC:BIPOLAR,MODULA TOR/DEMODULA TOR, BALANCED,MC1496P ,DIP14.
Replaceable Electrical Parts 8–58 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U905 156–2584–00 IC,DIGIT AL:HCMOS,FLIP FLOP ,OCTAL D–TYPE,CLEAR,74HC273,DIP20.
Replaceable Electrical Parts 1780R-Series Service Manual 8–59 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–60 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2U1270 156–1335–00 IC,DIGIT AL:LSTTL,MUL TIVIBRA TOR,DUAL RETRIG MONOST ABLE,96LS02,DIP16.
Replaceable Electrical Parts 1780R-Series Service Manual 8–61 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A2VR462 152–0760–00 DIODE,ZENER:6.
Replaceable Electrical Parts 8–62 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–63 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–64 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3L1 1 1 108–1262–00 INDUCT OR,FXD:POWER,100UH,10%,I<0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–65 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3R180 315–051 1–02 RES,FXD,FILM:510 OHM,.
Replaceable Electrical Parts 8–66 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A3R460 315–0102–03 RES,FXD,FILM:1K OHM,5%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–67 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–68 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–69 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–70 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4C598 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–71 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4L1 15 1 14–0438–00 INDUCTOR,V AR:SHIELDED,0.
Replaceable Electrical Parts 8–72 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–73 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R293 322–3308–00 RES,FXD,FILM:15.
Replaceable Electrical Parts 8–74 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R397 322–3261–00 RES,FXD,FILM:5.
Replaceable Electrical Parts 1780R-Series Service Manual 8–75 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4R483 322–3308–00 RES,FXD,FILM:15.
Replaceable Electrical Parts 8–76 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4U167 156–2558–00 IC,LINEAR:BIPOLAR,VOL T AGE REGULA TOR, POSITIVE,12V ,1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–77 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A4U346 156–0513–03 ICSC:CMOS,ANALOG MUX,8 CHANNEL,4051B,DIP16.
Replaceable Electrical Parts 8–78 1780R-Series Service Manual.
Replaceable Electrical Parts 1780R-Series Service Manual 8–79 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no.
Replaceable Electrical Parts 8–80 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5C335 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–81 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5C572 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 8–82 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5J515 131–3277–00 CONN,HDR:PCB,MALE,STR,2 X 30,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–83 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5R315 322–3385–00 RES,FXD:MET AL FILM,100K OHM,1%,0.
Replaceable Electrical Parts 8–84 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5R492 322–3130–00 B030488 RES,FXD,FILM:221 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–85 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *MOUNTING P ARTS* 136–0752–00 SOCKET ,DIP:PCB,FEMALE,STR,2 X 10,0.
Replaceable Electrical Parts 8–86 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *MOUNTING P ARTS* 136–0752–00 SOCKET ,DIP:PCB,FEMALE,STR,2 X 10,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–87 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number *END MOUNTING P ARTS* A5U330 156–3669–00 IC,PROCESSOR:NMOS,PERIPHL,DUAR T ,2681,DIP24.
Replaceable Electrical Parts 8–88 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5U384 156–2096–00 IC,DIGIT AL:ALSTTL,FLIP FLOP ,QUAD D–TYPE,CLEAR,74ALS175,DIP16.
Replaceable Electrical Parts 1780R-Series Service Manual 8–89 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A5U548 156–1312–00 IC,MISC:BIPOLAR,SAMPLE/HOLD,LOW DROOP RA TE,SMP–1 1,DIP14.
Replaceable Electrical Parts 8–90 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–91 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–92 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C383 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–93 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–94 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6C747 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–95 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6CR672 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A,1.
Replaceable Electrical Parts 8–96 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–97 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–98 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–99 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R157 322–3164–00 RES,FXD,FILM:499 OHM,1%,0.
Replaceable Electrical Parts 8–100 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R234 322–3164–00 RES,FXD,FILM:499 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–101 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R296 322–3226–00 RES,FXD:MET AL FILM,2.
Replaceable Electrical Parts 8–102 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R368 322–3097–00 RES,FXD,FILM:100 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–103 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R441 322–3273–00 RES,FXD:MET AL FILM,6.
Replaceable Electrical Parts 8–104 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R513 322–3193–00 RES,FXD:MET AL FILM,1K OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–105 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R602 322–3289–00 RES,FXD:MET AL FILM,10K OHM,1%,0.
Replaceable Electrical Parts 8–106 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R726 308–0549–00 RES,FXD,WW:6.
Replaceable Electrical Parts 1780R-Series Service Manual 8–107 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6R841 322–3222–00 RES,FXD:MET AL FILM,2K OHM,1%,0.
Replaceable Electrical Parts 8–108 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A6U21 1 156–1200–00 IC,LINEAR:BIFET ,OP–AMP ,QUAD,TL074CN/LF347N/MC 34004P ,DIP14.
Replaceable Electrical Parts 1780R-Series Service Manual 8–109 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number 136–0925–00 SOCKET ,DIP::PCB,24 POS,2 X 12,0.
Replaceable Electrical Parts 8–1 10 1780R-Series Service Manual.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 1 1 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no.
Replaceable Electrical Parts 8–1 12 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 13 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7C308 281–0773–00 CAP ,FXD,CERAMIC:MLC,0.
Replaceable Electrical Parts 8–1 14 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7C395 281–0775–01 CAP ,FXD,CERAMIC:MCL,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 15 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–1 16 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7L202 108–1212–00 INDUCTOR,FXD:CUST OM,SIGNAL,9UH,2%,IDC<300 MA,RDC<1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 17 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–1 18 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R209 322–3147–00 RES,FXD,FILM:332 OHM,1%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–1 19 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R289 322–3269–00 RES,FXD,FILM:6.
Replaceable Electrical Parts 8–120 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R355 315–0396–00 RES,FXD,FILM:39M OHM,5%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–121 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7R423 322–3210–00 RES,FXD:MET AL FILM,1.
Replaceable Electrical Parts 8–122 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7TP148 214–4085–00 TERM,TEST POINT :0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–123 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7U307 156–1852–00 IC,DIGIT AL:HCMOS,GA TE,HEX INVERTER,UNBUFFERED,74HCU04,DIP14.
Replaceable Electrical Parts 8–124 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A7VR196 152–0195–00 DIODE,ZENER:5.
Replaceable Electrical Parts 1780R-Series Service Manual 8–125 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–126 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8C278 290–0848–00 CAP ,FXD,ALUM:47UF ,20%,16V ,ESR=7.
Replaceable Electrical Parts 1780R-Series Service Manual 8–127 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–128 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–129 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–130 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R132 322–3481–00 RES,FXD,FILM:1M OHM.
Replaceable Electrical Parts 1780R-Series Service Manual 8–131 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R278 322–3258–00 RES,FXD:MET AL FILM,4.
Replaceable Electrical Parts 8–132 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R356 322–3201–00 RES,FXD:MET AL FILM,1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–133 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A8R433 315–0755–00 RES,FXD,FILM:7.
Replaceable Electrical Parts 8–134 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–135 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–136 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–137 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9DS428 150–1 168–00 DIODE,OPT O:LED,940NM,100MW ,50MA IF ,5V REVERSE,1.
Replaceable Electrical Parts 8–138 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–139 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–140 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–141 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A9U297 156–1 191–00 IC,LINEAR:BIFET ,OP–AMP ,DUAL, TL072CN/LF353N,DIP08.
Replaceable Electrical Parts 8–142 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–143 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A10R208 322–3093–00 RES,FXD,FILM:90.
Replaceable Electrical Parts 8–144 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A10U420 156–1917–00 IC,DIGIT AL:LSTTL,REGISTER,8–BIT SHIFT ,OUTPUT LA TCH,74LS595,DIP16.
Replaceable Electrical Parts 1780R-Series Service Manual 8–145 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–146 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A1 1R127 31 1–2442–02 RES,V AR,PNL:CP ,10K OHM,10%,0.
Replaceable Electrical Parts 1780R-Series Service Manual 8–147 Replaceable electrical parts list (cont.) Component number T ektronix part number Serial no.
Replaceable Electrical Parts 8–148 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12DS206 150–121 1–00 L T EMITTING DIO:GREEN,2.
Replaceable Electrical Parts 1780R-Series Service Manual 8–149 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–150 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A12DS334 150–121 1–00 L T EMITTING DIO:GREEN,2.
Replaceable Electrical Parts 1780R-Series Service Manual 8–151 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–152 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–153 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–154 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–155 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–156 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–157 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15CR300 152–0066–00 DIODE,RECT :400V ,1A,IFSM=30A, 1.
Replaceable Electrical Parts 8–158 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15U251 156–2992–00 IC,MEMOR Y :CMOS,SRAM,2K X 8,35NS,OE,DIP24.
Replaceable Electrical Parts 1780R-Series Service Manual 8–159 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A15U470 156–1722–00 IC,DIGIT AL:FTTL,GA TE,HEX INVERTER,74F04,DIP14.
Replaceable Electrical Parts 8–160 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 1780R-Series Service Manual 8–161 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no.
Replaceable Electrical Parts 8–162 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16L560 108–1450–00 INDUCTOR,FXD:SIGNAL,5.
Replaceable Electrical Parts 1780R-Series Service Manual 8–163 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16R122 31 1–2239–00 RES,V AR,TRMR:CERMET ,100K OHM,20%,0.
Replaceable Electrical Parts 8–164 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A16R440 315–0155–00 RES,FXD,FILM:1.
Replaceable Electrical Parts 1780R-Series Service Manual 8–165 Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number A17 671–0883–04 CIRCUIT BD ASSY :FUSE 80009 671–0883–04 A17C310 285–1222–00 CAP ,FXD,PLASTIC:0.
Replaceable Electrical Parts 8–166 1780R-Series Service Manual Replaceable electrical parts list (cont.) Component number Mfr . part number Mfr . code Name & description Serial no. discont’d Serial no. effective T ektronix part number CHASSIS P ARTS B1 1 19–1545–03 FAN,TUBE AXIAL:12V , 1.
Diagrams and Circuit Board Illustrations This section contains the troubleshooting procedures, block diagrams, circuit board illustrations, component locator tables, waveform illustrations, and schematic diagrams. Symbols Graphic symbols and class designation letters are based on ANSI Standard Y32.
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SCHEM LOCA TION CIRCUIT NUMBER C103 B2 C126 B4 C208 D1 C218 B2 C221 B2 C222 G1 C223 B2 C230 D3 C231 D3 C242 B4 C245 B3 C246 G3 C247 B3 C307 D1 C313 D1 C319 F1 C336 D3 C343 F3 C41 1 E2 C412 F2 C424 B3 .
TL072 R311 301.0 +12VE VIDEO AMPLIFIER C307 .001UF CR307 R307 301.0 +12VE +12VE PA NE L REAR CH-A J8 L116 48NH C218 .1UF R114 37.4 1 CR212 D-0141 1 10 9 2 5 6 K213 R115 1.00M AC/DC +12VE C208 47UF R203 6.2M Q204 R223 6.19K R211 20.0K R209 121.0 R210 562.
SCHEM LOCA TION CIRCUIT NUMBER C150 B2 C173 B5 C255 D1 C266 B2 C268 B3 C269 G1 C270 B3 C278 D4 C289 B4 C291 B3 C292 B3 C293 G4 C354 D1 C360 D1 C367 F1 C379 D3 C383 D4 C390 F4 C459 E2 C460 F2 C472 B3 C.
+12VC R358 301.0 VIDEO AMPLIFIER CR355 D-0141 C354 .001UF +12VC +12VC R354 301.0 PA NE L REAR CH-B2 J4 L163 48NH C266 .1UF R165 37.4 CR268 D-0141 1 10 9 2 5 6 K261 AC/DC +12VC R166 1.00M C255 47UF Q251 Q-1059 R250 6.2M +12VC R256 121.0 R258 562.0K R257 20.
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SCHEM LOCA TION CIRCUIT NUMBER A2 C1 1 13 F2 C1 1 16 G2 C1 1 18 F1 C121 1 F3 C1212 F3 C1213 F4 C1216 G4 C1220 G4 C1221 H4 C1222 G2 C1312 F4 C1313 G4 J1203 E2 L1220 H4 Q1 1 10 F3 Q1 1 1 1 F2 Q1 1 13 F2.
SHIELD BOX C297 10UF -12VDCPL R397 20.0 PROBE INPUT AMPLIFIER +12V R490 3.32K 6.2V BEC Q492 Q390 Q295 GAIN TO TP389 APPROX. 1.15 (X1) Q390 Q-0712 VR390 D-0166 C391 .1UF +12V 2 TP389 1 2 1 2 P389 1 2 J389 AND 11.5 (X10) Q294 Q-0190 C392 4.7PF R395 *SEL +12V -12V R393 1.
SCHEM LOCA TION CIRCUIT NUMBER C1024 C1 C1029 C1 C1036 D1 C1040 D1 C1 131 A3 C1232 A3 C1329 A2 C1426 C5 C1440 E5 C1441 H5 C1443 F4 C1536 F3 C934 B1 C936 E1 CR1022 B1 CR1040 D1 CR1430 E4 CR1433 D5 CR14.
– AMPLIFIER +12V1 TP1130 C1036 .1UF -12V1 R1037 332.0 R1038 332.0 R1044 10.0 + AMPLIFIER Q1025 Q-0719 +12V1 R1028 332.0 R1023 22.1 R1029 100.0 CR1022 D-0141 C934 .1UF +12V1 R1021 332.0 R934 10.0 <1> H2 J1322 CONNECTS A8 INPUT BOARD SIG A TO P1322 & BNC 1 2 J1322 2 VOL TS P-P 1 <7> E2 SEL_A+ -12V1 R1321 953.
SCHEM LOCA TION CIRCUIT NUMBER C1028 E5 C1041 D1 C1042 D1 C1046 E2 C1047 E2 C1 134 B1 C303 G5 C825 D5 C826 E2 C829 D2 C830 D3 C831 D2 C832 C2 C835 B1 C836 B1 C837 F4 C838 E4 C842 G4 C844 D4 C845 D4 C8.
+12V1 CR928 +12V1 R928 4.99K R929 2.00K FLA T 6.2V C836 .1UF +12V1 VR936 C835 10UF R835 47.5 DIFFERENCE AMPLIFIER D1 <4> E1 SIGNAL_+ R1036 750.0 LF CMR C1134 4700PF R1033 250 1 5 1 2 1 3 89 1 8 1 6 15 1 7 1 4 7 4 2 U935 H2243 +12V1 -12V1 R1134 487.
SCHEM LOCA TION CIRCUIT NUMBER C212 G4 C318 G4 C320 E3 C410 B3 C41 1 B4 C412 B3 C414 C3 C415 E4 C418 F4 C422 F3 C423 F3 C429 F1 C435 E1 C522 E2 C523 F3 C527 F1 C533 F2 C609 D4 C610 D4 C61 1 D4 C614 C4.
TO CRT VERTICAL CONNECTS BLUE CRT+ +30V R437 1K C435 .1UF R637 1K L638 2.7UH L437 2.7UH L339 64UH +60V DEFLECTION AMP L626 2.7UH R527 1.00K ORTHOGONALITY OUTPUT HF RESP COMP C630 27PF R534 100 Q630 Q628 Q635 +12V1 R629 150.0 R631 61.9 R636 100.0 R535 61.
SCHEM LOCA TION CIRCUIT NUMBER C1003 B1 C101 1 E4 C1016 F4 C1019 H4 C1 1 17 E4 C1414 C1 C1415 C2 C1517 B5 C713 C4 C812 C4 C817 C4 C913 F5 CR101 1 G4 CR1 1 1 1 G4 CR1304 B5 CR1312 C1 CR1313 C1 CR1405 B.
U1019A 1 2 3 4 5 LINE STROBE OUT REAR PA NE L J1103 LINE STROBE 1-2 LINE SELECT 2-3 FIELD 1 PULSE P1103 C2 SEL_GND- A 1 B 2 C 3 G1 6 G2A 4 G2B 5 Y0 15 Y1 14 Y2 13 Y3 12 Y4 11 Y5 10 Y6 9 Y7 7 U1523 74HCT238 SEL_B1- C1414 15PF Q1415 A- B- +5VD C1003 .1UF +5VD +5VD R1414 6.
C1010 B3 C1066 D4 C1067 B3 C1070 B4 C1071 B3 C1072 B3 C1075 F3 C1079 F3 C1 160 G5 C1 171 D3 C1 179 E3 C1247 E5 C1251 D5 C1252 E5 C1254 F4 C1267 B5 C1272 A5 C1276 D3 C1281 E3 C1365 C5 C1370 C2 C1374 C1.
1 +14V POWER SUPPL Y REFERENCE SYNC SEP ARA TOR LOW P ASS FIL TER Q1475 +12V2 R1575 100.0 1 H4 <4> R1570 887.0 R1576 887.0 C1575 87PF REF_VIDEO C1571 77PF C1374 130PF C1473 47PF +12V2 +12V2 -12V2 R1474 2.21K R1475 806.0 R1473 806.0 R1472 100.0 R1467 100.
C196 B3 C198 C3 C285 D2 C287 C2 C290 E2 C380 B2 C390 D2 C495 E3 C496 F3 C767 B5 C771 C5 C855 G4 C858 G4 C861 E5 C870 C5 CR385 D2 CR386 D2 CR392 E2 J192 B1 J858 G5 J865 D4 J866 D4 J867 D4 P192 B1 P858 .
74HC04 74HC04 B5 DIR_REMSYNC 1 R187 200.0 9 10 8 U185C 74HC00 12 13 11 U185D 74HC00 REF OR REMOTE SYNC SWITCH B4 G2 <8> COMP_SYNC /REM_SYNC_EN J147-4 J147-6 <12> <12> REMOTE SYNC POLARITY B3 J192 1-2 POSITIVE 2-3 NEGATIVE 123 J192 P192 REM_SYNC 1 2 U190A 74HC04 11 10 U190E /DIR_REMSYNC_EN +5VD R283 20.
SCHEM LOCA TION CIRCUIT NUMBER C394 E3 C485 E4 C587 E2 C593 F2 C690 E2 C693 F4 C786 D1 C793 C4 C795 B5 CR485 E2 CR488 E2 CR590 F2 CR592 F4 CR775 D1 CR777 D2 CR778 D1 CR795 B4 J585 G3 J694 B4 P585 G3 P.
74HC04 SWITCH BLANKING RETRACE & +5VD B4 <12> LINESEL_RETR LINE SWEEP GA TING 1 2 3 U775A 74HC32 1 2 3 U780A 74C08 NC E3 <7> C786 270PF SWITCH_BLANK +5VD R786 3.
SCHEM LOCA TION CIRCUIT NUMBER C267 F2 C352 G2 C368 F2 C381 B5 C469 D3 C474 C3 C477 C3 C478 C3 C482 A1 C549 G3 C571 D3 C572 D3 C575 D3 C576 A2 C580 C2 C586 B4 C649 G4 C651 G2 C670 D2 C675 C1 C765 B2 C.
74HC04 J130-2 B1 <12> /W_RO_EN 1 4 12 1 3 U580C CA3046 B3 C482 .1UF -2.2V W A VEFORM BLANKING 8.2V J147-22 B5 <12> VR578 D-0217 /WFM_BLANK +5VD R681 2.21K R679 2.21K R675 1.00K 1 1 9 1 0 U580B CA3046 8 6 7 U580A CA3046 J130-22 B2 <12> E3 <12> C675 51PF CR675 T_CUR+LN_SEL CURS_SEL +5VD R676 30.
SCHEM LOCA TION CIRCUIT NUMBER C248 G1 C250 G1 C252 G2 C707 H4 C708 H4 C710 H3 C71 1 G3 C808 H3 C810 H3 C906 H2 C907 H5 C908 H4 J130 A1 J147 A3 R231 E2 R232 E2 R255 G2 R256 G2 R710 G3 R808 G3 U207 C3 .
SAMPLE & HOLDS DAC LA TCHES VECT_GAIN <7> A1 ED_[0..7] <6> H4 V_RO_DATA_WFM 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 .
SCHEM LOCA TION CIRCUIT NUMBER C758 E5 CR1060 F4 CR1061 F4 CR1 141 E4 CR1 142 D4 CR1 150 D3 CR1 151 E3 CR1365 F3 CR1366 F3 CR1588 B4 CR1593 B4 CR1597 B3 CR358 F2 CR359 G2 CR458 E2 CR459 E2 CR462 D2 CR.
CR658 D-0141 Q658 Q-0188 +12V2 F1 SLOW SWEEP TRIGGER 3 2 1 4 1 1 U458A TL074 +12V2 R761 200K <8> AGC_VIDEO TRIG LEVEL SLOW SWEEP <12> SLW_SWP_+/- E5 C661 .1UF 5 6 7 U458B TL074 -12VDCPL -12VDCPL R663 121.0K 3 4 U260B 74HC04 C457 .1UF C557 .
SCHEM LOCA TION CIRCUIT NUMBER C875 B3 C969 D2 J1081 E2 J1085 F3 J870 C2 P1081 E2 P1085 F3 Q969 D2 Q970 D2 R1070 D2 R1085 F3 R872 B4 R968 C2 R969 D2 R970 D2 R985 E2 TP981 F3 U975A B3 U975B B4 U977 C3 .
OSCILLA TOR PHASE CONTROL E5 <15> FLOP1 +5VD E5 <15> FLOP2 H4 +5VD D 2 Q 5 CK 3 Q 6 P R 4 C L 1 U985A 74HC74 D 12 Q 9 CK 11 Q 8 P R 1 0 C L 1 3 U985B 74HC74 <15> J1081 FRAME PULSE SELECT 1-2 INTERNAL 2-3 EXT VIDEO 1 2 3 J1081 P1081 SYNC_GATE +5VD +5VD R985 1.
SCHEM LOCA TION CIRCUIT NUMBER C991 G1 C1086 E3 C1090 G1 C1091 E3 C1093 H1 C1094 E3 C1 194 E3 C1 195 C3 C1284 C4 C1287 D3 C1288 D3 C1291 D3 C1347 B2 C1351 E2 C1364 G3 C1386 B3 C1390 B3 C1391 B4 C1394 .
C1490 .1UF C1497 .1UF +5VD +5VD 50% PT C1093 .1UF C991 1UF C1090 1UF +5VD +5VD +5VD COMPARA TOR +12V2 +12V2 R1457 825.0 R1352 3.92K R1354 2.00K R1353 2.00K SYNC 50% DETECTOR IN 2 S/H 14 VLC 13 OUT 7 NUL 4 +V 9 HOLD 11 N/C 12 N/C 10 NUL 3 -V 5 U1460 SMP-11F C1561 .
SCHEM LOCA TION CIRCUIT NUMBER C135 G3 C137 H3 C140 H3 C142 G4 C145 H4 C240 H4 C335 G4 C336 H4 C342 H4 C344 G4 C433 B3 C434 B2 C440 H4 C445 H4 C450 G4 C534 H4 C540 A5 C541 A5 J342 B4 J344 A5 R355 E1 R.
+5V +5V <19> B1 A1 F5 A5 <17> IA[0..23] IA[0..23] LA TCH/BUFFER F1 1 61 9 60 44 43 27 26 10 32CG16 (TOP) U340 VISUAL AID <17> AD[0..15] AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD0 47 AD1 46 AD2 .
SCHEM LOCA TION CIRCUIT NUMBER C150 A2 C155 A2 C210 B2 C215 A3 C220 A3 C255 B3 C257 A3 C261 A3 C457 B3 J453 B1 P453 B1 R361 C5 R362 C5 R363 C4 R364 C5 R450 C3 R456 C3 R460 C4 U150 E1 U151 F1 U155 E2 U.
NC NC +5V +5V +5V H2 ROM <16> C1 AD[0..15] AD[0..15] ADDRESS MUL TIPLEXER IA[0..23] <16> H1 IA[0..23] J453 RAM PART SELECTION 2-3 512K RAM INSTALLED 1-2 128K RAM INSTALLED (NORM) 1 2 3 J45.
SCHEM LOCA TION CIRCUIT NUMBER C177 H4 C185 H4 C187 H4 C264 C2 C265 C2 C285 H4 C455 E5 C476 H4 C480 H4 R370 G1 R455 E4 U165 F3 U167 B3 U367 D1 U375 E1 U453A E5 U453B D5 U475 G1 U476 F1 W475 D1 Y264 D2.
+5V PROGRAM ST A TIC 44 43 80C451 27 26 2 11 26 27 28 43 44 45 80C451 ONL Y PROCESSOR Y264 12MHZ C265 33PF W475 0 OHM EA/VP 1 X1 53 X2 52 RESET 35 INT0 38 INT1 39 T0 40 T1 41 P1.0 27 P1.1 28 P1.2 29 P1.3 30 P1.4 31 P1.5 32 P1.6 33 P1.7 34 P0.0 17 P0.1 16 P0.
SCHEM LOCA TION CIRCUIT NUMBER C1 17 G5 C130 G5 C190 G5 C195 G4 C290 G5 C294 G3 C295 H3 C315 D3 C390 G5 C492 D1 C493 D1 C495 G5 C496 G5 C592 D1 C593 D1 CR295 G4 CR394 H3 CR395 H3 DS491 D2 DS492 D2 DS4.
+5V +5V NC SERIAL PORT RS422_TXL RS422_TXH RS422_RXL RS232_TX RS232_RX 1 6 2 7 3 8 4 9 5 J595 +5V R393 1.00K RS422_TXH RS422_TXL RS422_RXH RS422_RXL 7 4 5 6 3 8 1 2 U395 75179A 9 10 8 U595C 74ALS00 12.
SCHEM LOCA TION CIRCUIT NUMBER C170 B4 C171 G4 C175 G4 C180 G4 C276 G4 C284 G4 C448 G1 C465 G3 C485 G4 C487 G4 C539 H1 C550 G4 C551 G4 C553 G4 C554 G4 C558 H3 C567 F2 C568 E2 C569 E3 C570 E3 C571 E2 C.
NC NC R537 1.00K +5V +5V R566 2.00K <21> J415-5 F1 C539 1000PF H SHAPE SAMPLE & HOLD R536 5K +12V 1 2 3 1 4 1 1 U541A TL074 IN 2 S/H 14 VLC 13 OUT 7 NUL 4 +V 9 HOLD 11 N/C 12 N/C 10 NUL 3 -V 5 U548 SMP-11F W548 0 OHM +12V R438 1.00K R437 499.
SCHEM LOCA TION CIRCUIT NUMBER C105 A3 C205 A3 J1 15 D2 J415 F1 J515 H1 R105 B1 R1 1 1 C1 R1 12 C1 R1 13 C1 R1 14 C1 R1 15 C2 R1 16 C2 R1 17 C2 R1 18 C2 R305 B2 R402 C4 R403 C5 R404 C4 R405 C3 R406 C3.
NC NC NC NC NC NC NC NC NC +5V NC J415 <20> D3 CURS_SEL -15V +15V +5V +5V C4 C3 C4 C4 C4 C4 <18> INTENS_1 H_POS_1 H_POS_2 V_POS_1 V_POS_2 SCALE_1 /WLS_FIELD C3 FOCUS_1 V_SYNC REM_SYNC RGB_.
A23 A2 R1234 # " .
NC NC RL0 RL1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 23 23 24 24 25 25 26 26 27 27 28 28 29 29 30 30 31 31 32 32 33 33 34 34 J112 |J-3364| CR107 CR106 Y0 SCANL0 RL[0.
A23 A2 R1234 # " .
LUM/ X5 RIGHT DISPLA Y 8 7 6 5 4 3 2 1 DS124 FANODE0 LEFT DISPLA Y 3 12 4 S135 RIGHT DISPLA Y 3 12 4 S115 3 12 4 S125 LEFT DISPLA Y RL1 3 12 4 S105 VECT/ SCH CH A/ RL0 3 12 4 S205 PIX X Y/ PARADE/ OVE.
A23 A2 R1234 # " .
C298 .1UF 5 6 7 U297B TL072 TP_OUT +5V C288 .1UF +5V SL[0..3] TP_OUT +5V +5V +5V +5V +15V IN 3 OUT 1 G 2 U498 78L05 +5V C105 .1UF TCATH0 TANODE2 TANODE2 +5V Q113 DS106 DS206 Q120 Q128 Q136 X0 X0 X1 X2 X3 X4 X5 X6 X7 SL0 SL1 X4 X5 X6 X7 +5V +5V Q143 Q243 TOUCH P ANEL SENSITIVITY C292 680PF IN 2 OUT 3 G 1 U296 79L12 C297 .
A23 A2 R1234 # " .
SCHEM LOCA TION CIRCUIT NUMBER C183 F4 C184 G4 C185 G4 C188 F5 C190 F5 C288 G4 C290 E4 C292 E5 C294 F5 C464 F2 C471 E2 C474 E2 C483 H3 C484 H3 C486 H3 C562 F1 C570 E3 C571 E3 C573 E3 C576 D2 C582 B5 C.
A6 V ectorscope W aveforms and J885 Connections.
TO COMPASS ROSE 800mV P-P GAIN CELL 6.2V VR577 D-0461 +12V +12V R561 47.5 R477 619.0 +12V R469 4.32K 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 .
SCHEM LOCA TION CIRCUIT NUMBER C131 D5 C156 E1 C157 E1 C162 F2 C165 F3 C166 F3 C171 D4 C172 D4 C257 D2 C264 E5 C273 G3 C277 G3 C357 C2 C358 C2 C360 C3 C365 D3 C369 G4 C373 H3 C377 H4 C383 G5 C481 C4 C.
C156 .1UF +12V <25> H1 AMP_CHROMA 1 C357 .01UF R357 1.00K DIFFERENTIAL GAIN DEMODULA TOR R257 100.0 MIRROR CURRENT C157 51PF R158 499.0 R156 150.0K R155 1.00K R157 499.0 2 1 36 4 5 Q158 Q-0261 LOW P ASS FIL TER Q160 Q-0188 C162 10UF +12V R164 4.
SCHEM LOCA TION CIRCUIT NUMBER C324 F5 C330 F5 C350 F2 C351 E2 C420 B4 C421 B4 C450 F3 C454 E2 C456 E2 C457 G2 C521 B4 C554 F2 C555 E2 C648 F5 C659 F3 C660 G3 C661 G3 C664 H3 C693 F5 C695 C5 C747 F5 C.
A4 <25> +5V +5V +5V R753 1.00K R748 1.00K +V 1 IN1 3 IN2 4 -V 6 STB1 13 OUT1 11 OUT2 9 STB2 8 U757 LM361 C756 .1UF +12V <28> D4 CONTROL SIGNAL C758 .
SCHEM LOCA TION CIRCUIT NUMBER C1 16 E1 C1 18 G2 C120 G2 C126 F3 C136 D2 C137 C1 C140 C2 C221 G2 C225 G2 C238 B1 C336 C5 C339 C5 C341 D5 C438 B5 C443 D3 C538 F5 C641 E3 C645 D2 C738 G4 C742 G4 C744 D3.
CENTER DOT VER TICAL VECTOR 1 Q239 Q-0188 R241 6.81K <27> E2 /CENTER_DOT_CLAMP J885-45 <25> <30> VECT_V_POS -12V R240 47.5K POSITION CLAMP A4 C1 CR236 D-0141 CR237 D-0141 C238 .01UF C137 .1UF R238 8.25K R235 10.0K R237 604.0 R141 22.
SCHEM LOCA TION CIRCUIT NUMBER C105 C4 C1 10 C4 C205 C5 C208 G4 C213 G4 C305 C3 C401 D2 C404 G4 C503 C1 C605 G4 C672 G3 C673 G3 C761 G3 C861 G3 CR671 H3 CR672 G3 CR860 G3 CR861 H3 J100 A5 J108 C4 J205.
TL074 PICTURE MONITOR SWEEPS <27> E5 Q602 R601 10.0K R604 20K H_SYNC_A R603 10.0K 4V P-P C503 .01UF R606 100K 6 5 7 U506B TL074 2 3 1 4 1 1 U506A +12V -12V R602 10.0K R605 49.9K R506 20.0K R501 10.0K ~7V P-P 0V <30> E4 ~ PIX_HORIZ POST REGULA TORS ~6V P-P POS 0V <30> E2 PIX VERT ~ 9 10 8 U506C TL074 PIX_VERT +12V R406 20.
SCHEM LOCA TION CIRCUIT NUMBER C146 C5 C148 D5 C150 D5 C153 C4 C216 B1 C218 B1 C243 B5 C248 B5 C249 B5 C251 C5 C318 B1 C319 B1 C343 E5 C344 E5 C346 F5 C41 1 E2 C412 E2 C417 F2 C529 E4 C530 E4 C537 F4 .
BUFFER R–Y C805 22PF R804 1.00K C218 *SEL R218 5.62K AMPLIFIER R–Y 1 <28> H2 C319 .1UF DEMOD_R-Y -12V R317 332.0 R315 1.10K R316 100.0 R219 499.0 <28> B2 C318 .1UF C216 .1UF VERT_CLAMP_FB +12V -12V R806 2.00K R802 1.50K 3 2 6 1 7 5 8 4 U216 EL2020 (0 +/- 2.
A23 A2 R1234 # " .
SCHEM LOCA TION CIRCUIT NUMBER C167 F1 C173 A3 C174 F1 C177 E1 C178 G1 C179 F1 C180 F1 C182 F1 C186 A3 C187 C1 C190 C3 C191 E1 C193 C1 C196 C1 C273 F2 C276 B3 C279 E3 C280 D3 C281 E1 C282 E1 C283 A3 C.
A7 Oscillator Board W aveforms.
VCXO +12V R174 1.21K C174 .1UF R279 806.0 C179 82PF SAMPLING C191 .01UF 5.1V TRANSDUCT ANCE AMPLIFIER LOWP ASS FIL TER +12V VR196 C196 100UF REF VIDEO J499 CONNECTS TO J1446 <4> H4 A2 WAVEFORM BOARD 1 2 J499 1 BANDP ASS FIL TER C392 220PF C298 100UF +12V +12V R397 909.
SCHEM LOCA TION CIRCUIT NUMBER C151 G4 C153 B2 C155 A2 C156 A2 C161 A1 C228 G4 C246 G4 C248 C2 C249 C2 C250 C2 C252 B2 C253 G2 C256 A2 C260 G1 C327 H4 C334 G5 C338 H4 C340 F4 C343 G4 C344 G4 C348 H3 C.
+5A +5A +5A +5A +5A +5A +5A +5A C365 330PF R260 100.0 LOWP ASS FIL TER MIXER C358 .022UF +5D1 R258 2.21K 1 2 3 7 1 4 U256A 74F86 NC F4 <31> Q_INVERT 12 13 11 U256D 74F86 ERROR AMPLIFIER C364 330PF +5A R462 825.0 1 LOWP ASS FIL TER MIXER C367 .022UF R266 2.
SCHEM LOCA TION CIRCUIT NUMBER C131 A5 C133 B5 C139 C5 C142 B5 C143 F5 C144 A5 C149 B5 C165 F5 C202 E2 C203 E2 C206 E2 C207 F5 C209 C5 C210 E1 C212 C5 C226 F5 C259 D5 C261 D5 C302 F2 C303 A2 C304 D3 C.
C307 .1UF +12V +12V Q409 Q-0221 Q408 Q-0221 R410 332.0 R409 332.0 C413 .1UF C513 .022UF +12V R413 4.02K 5 6 7 U415B TL072 ERROR AMPLIFIER C311 47UF C415 .1UF +12V R406 3.01K R411 150.0K R310 3.01K C210 33PF C202 56PF Q309 Q-0188 R203 10.0K CR310 VCO C302 22PF 23 24 1 Q307 Q-0190 CLOCK /CLOCK +5A R307 4.
SCHEM LOCA TION CIRCUIT NUMBER C219 E4 C225 E4 C227 E4 C320 F4 C417 H1 C418 H1 C419 H1 C433 C4 J1 15 A2 J320 D1 P320 D1 Q322 F2 R213 E2 R214 E1 R314 E1 R315 F4 R317 E2 R318 F2 R319 F4 R320 F4 R321 F4 .
C419 .1UF +12V AL TERNA TE MODE SWITCH +12V R430 750.0 SWITCH CONTROL +5A DIFF . PHASE DISPLAY J320 P320 +5A 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 1.
A23 A2 R1234 # " .
SCHEM LOCA TION CIRCUIT NUMBER C100 H3 C1 10 G2 C1 1 1 H2 C130 A1 C140 A1 C141 A1 C150 B1 C151 B1 C160 A1 C161 A1 C170 A1 C171 A1 C180 A1 C181 B1 C210 G2 C21 1 G2 C212 G1 C220 G1 C300 G3 C310 H3 C31 1.
A15 Filter Board W aveforms and J310 Connections.
NC NC 10 3 FL TR_DEMOD +5VA W123 0 OHM R210 1.00K VCC A 40 GND D 35 VEE D 3 A IN 21 A OUT 1 DO_0 34 DO_1 33 DO_2 32 DO_3 31 DO_4 30 DO_5 29 DO_6 28 VREF 25 DO_7 27 DI_0 13 DI_1 12 DI_2 11 DI_3 10 DI_4.
A23 A2 R1234 # " .
SCHEM LOCA TION CIRCUIT NUMBER C164 G3 C165 G3 C197 G1 C264 H3 C265 H3 C289 G4 C291 E2 C293 H4 C299 G1 C384 E4 C385 C4 C390 B2 C391 D1 C397 F2 C399 G1 C598 F1 CR296 H2 CR394 D2 CR395 E2 CR481 C5 CR498.
A4 Z–Axis Board W aveforms.
+100V +100V R197 2.00K R196 475.0 W A VEFORM Z–AXIS AMP <40> C3 <38> A3 J180 23 28 30 /RY_SCH_BLNK /WFM_BLANK W_BLANK_EN WLS_LINE 9 10 12 13 8 U289B 74ALS20 4 5 6 U357B 74HC32 HI = BLANK W A VEFORM Z–AXIS C391 47PF R391 4.75K <38> H2 /CURSOR_LOCATE 1US C598 .
SCHEM LOCA TION CIRCUIT NUMBER C100 G1 C101 G1 C102 H4 C104 H1 C108 C2 C109 H1 C1 10 H1 C1 12 B4 C1 13 C2 C1 15 B2 C1 16 B2 C1 18 E4 C120 E4 C206 F2 C207 C3 C21 1 B4 C214 B2 C215 C2 C218 D4 C219 E5 C3.
C219 .1UF -12V 15.0K C416 .1UF -12V C104 .1UF +12V R100 511.0 CR307 D-0141 OSCILLA TOR 10MHZ C215 .1UF +5V R113 200.0 SAMPLE AND HOLD +12V PHASE DETECTOR C402 .001UF CR402 D-0141 R303 6.19K Q204 Q-0188 C206 .1UF CR204 TP108 +5V +12V R205 10.0K R206 2.
SCHEM LOCA TION CIRCUIT NUMBER C133 D5 C136 E5 C139 E5 C143 E5 C217 F4 C220 E5 C223 F5 C320 F5 C323 F5 C327 G5 C329 G5 C333 F5 C336 G5 C339 G5 J156 A1 J180 A1 R217 F4 U218B F4 U223A D5 U223B G3 U233 D.
D11 D10 D9 D8 +5V +5V D7 D6 D5 D4 +5V +5V +5V +5V CURSOR & CURSOR ENABLE CURSOR VS SWEEP SYNCHRONIZA TION W_FOCUS CURSOR J156 CONNECTS TO J550 A16 WAVEFORM HIGH 1 1 2 2 3 3 J156 BOARD <42> A.
SCHEM LOCA TION CIRCUIT NUMBER C148 A2 C151 B2 C250 A1 C251 G1 C343 A1 C346 B2 C348 B2 C350 G3 C351 G1 C352 G3 C353 B1 C354 E1 C355 E1 C357 B1 C440 B1 C444 B2 C452 G2 C453 G2 C454 E2 C455 E2 C456 G4 C.
J180-60 <38> A5 VECT_V_POS C351 .1UF 5 6 7 U355B TL074 J156-2 <38> A1 ANAL OG MUL TIPLEXERS W_FOCUS 3 2 1 4 1 1 U451A TL074 C355 .1UF +12V +12V +12V +12V +12V C353 .1UF C343 .1UF C557 .1UF C250 .1UF C357 .1UF C440 .1UF C489 .1UF +12V +12V +12V -12V -12V -12V C588 .
SCHEM LOCA TION CIRCUIT NUMBER C226 A5 C263 G1 C267 G2 C269 G3 C272 G4 C361 A4 C364 F1 C366 F2 C369 F3 C372 F4 C463 A5 C469 A5 C476 D2 C478 A5 C566 A5 C571 B5 C578 B5 CR466 F1 CR467 F2 CR472 F3 CR473 .
SCALE DRIVERS PULSE WIDTH MODULA TORS +12V R465 14.3K <39> H4 V_SCALE_INTENS R463 18.2K R464 4.75K VECT EXT/INT 10 9 8 U466C TL074 5 6 7 U466B TL074 R466 10.0K C364 10UF 3 2 1 4 1 1 U466A TL074 CR466 D-0141 +12V -12V R364 332.0 J180-13 J180-20 <38> <38> A2 A2 C263 100UF Q363 Q-0710 Q362 Q-0622 VECT_INT_LAMP +15VA +15VA R264 47.
SCHEM LOCA TION CIRCUIT NUMBER C100 C3 C101 F3 C102 F3 C1 10 C2 C1 1 1 B3 C1 12 B2 C120 B2 C130 A3 C200 F4 C210 C4 C21 1 B3 C230 B1 C260 D1 C261 C2 C262 D2 C263 E2 C264 D2 C280 E2 C300 B5 C31 1 C4 C32.
HV CONNECTOR +9KV IN 2 OUT 3 G 1 CR151 HV SUPPL Y INDICATOR DS340 OSC 33KHZ R102 4.7 +60V C230 .01UF L110 100UH C120 10UF 5 4 3 2 1 16 15 11 6 7 8 T240 CR150 R161 15 J156 J155 -2750V POWER SUPPLIES R160 22K R162 47K R180 510 C260 .001UF DS160 C262 .01UF C261 .
SCHEM LOCA TION CIRCUIT NUMBER C100 B1 C101 F4 C102 F4 C1 10 B2 C1 1 1 B2 C1 13 F4 C120 F3 C121 F3 C210 B2 C230 C1 C231 D1 C240 D2 C241 D2 C242 D1 C243 D2 C250 E3 C251 E3 C300 A2 C365 E5 C410 A1 C41 1.
R330 HV CONNECTOR +16KV 4X IN 2 OUT 3 G 1 U220 L200 100UH R200 4.7 C100 10UF +60V Q300 MOUNTED ON CHASSIS 1 1 2 2 3 3 J300 OSC 25KHZ HV SUPPL Y INDICATOR DS300 R300 15 C411 680PF C410 .01UF 3 1 5 4 16 11 7 6 2 15 T210 T-1765 POWER SUPPLIES J130 J135 CR220 D-0409 C419 1UF R320 10.
SCHEM LOCA TION CIRCUIT NUMBER C100 G3 C120 F4 C121 F4 C130 F3 C132 D5 C134 E5 C135 E5 C140 D5 C141 E2 C160 C1 C170 C1 C234 E5 C240 E2 C260 A5 C270 D1 C271 D1 C300 F3 C301 G3 C310 A1 C320 F2 C321 F1 C.
-8V NC NC NC NC +60V -15V +15V ANLG GND +5V CURSOR /W_FOCUS PWR_SW_1 PWR_SW_2 NC NC NC NC +160V NC NC W400 0 OHM +60V -15V +15V +160V +5VA CURSOR /W_FOCUS 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 .
SCHEM LOCA TION CIRCUIT NUMBER J303 E1 J308 D1 J516 H1 J531 A1 J547 A3 J565 H3 A1 1 Interconnect Board <44> Component Locator A23 A2 R1234 .
NC NC NC NC NC NC NC NC NC NC NC NC /WLS_FIELD V_SYNC /FL TR_BD /ERD +V_OUT /EWR ED_4 ED_5 ED_6 ED_7 +5V -8V NC DEMOD FL TR_DEMOD -12V NC +12V -5V /MA /BYP AS S /FL /LSE AFC_SYNC CLOCK2 /CLOCK2 CLOCK .
SCHEM LOCA TION CIRCUIT NUMBER A1 1 J1 16 D1 J133 D4 J143 D3 J150 D2 J165 D4 J492 A1 J497 H1 S100 F5 A13 DS1 1 1 E2 DS121 E1 DS131 E2 DS141 E1 DS151 E2 P1 16 D1 S131 E1 A14 DS1 10 E3 DS120 E3 DS130 E3.
1 1 2 2 3 3 4 4 5 5 6 6 7 7 J116 J375-39 J375-42 J375-43 <46> SC3 LED_R1 SW_R1 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 11 11 12 12 13 13 14 14 15 15 16 16 17 17 18 18 19 19 20 20 21 21 22 22 2.
SCHEM LOCA TION CIRCUIT NUMBER J375 A1 J380 H1 R109 E2 R123 E3 R127 E3 R138 E4 R158 E4 R185 D4 R191 D4 R198 D3 A1 1 Interconnect Board <46> Component Locator A1 1 Interconnect Board <46> C.
J308-34 J308-36 J492-57 J547-22 MICROPROCESSOR <44> <45> H_RO_DATA_VEC V_RO_DATA_VEC /WFM_BLANK /DAC_SEL /ERD NC NC J303-55 J565-3 J303-54 J492-58 J565-4 J565-34 J492-17 J531-9 J531-32 <.
.
1780R-Series Service Manual 10–1 Mechanical Parts List This section contains a list of the replaceable mechanical components for this instrument. Use this list to identify and order replacement parts. Parts Ordering Information Replacement parts are available through your local T ektronix, Inc.
Mechanical Parts List 10–2 1780R-Series Service Manual Using the Replaceable Mechanical Parts List T able 10–1 describes each column in the replaceable parts list. T able 10–1: Replaceable parts list column descriptions Column Name Description Fig.
Mechanical Parts List 1780R-Series Service Manual 10–3 Manufacturers Cross Index Mfr . Code Manufacturer Address City , State, Zip Code 06383 P ANDUIT CORP 17301 RIDGELAND TINLEY P ARK IL 07094–29.
Mechanical Parts List 10–4 1780R-Series Service Manual Replaceable Parts List Fig. & Index Number T ektronix Part Number Serial No. Effective Serial No.
Mechanical Parts List 1780R-Series Service Manual 10–5 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No.
Mechanical Parts List 10–6 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –44 21 1–0721–00 13 SCREW ,MACHINE:6–32 X 0.
Mechanical Parts List 1780R-Series Service Manual 10–7 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No. Discont’d Serial No. Effective T ektronix Part Number –67 _____ _____ 1 FAN,TUBE AXIAL:12V , 1.
Mechanical Parts List 10–8 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No.
Mechanical Parts List 1780R-Series Service Manual 10–9 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No.
Mechanical Parts List 10–10 1780R-Series Service Manual Replaceable Parts List (Cont.) Fig. & Index Number T ektronix Part Number Serial No. Effective Serial No.
Mechanical Parts List 1780R-Series Service Manual 10–1 1 Replaceable Parts List (Cont.) Fig. & Index Number Mfr . Part Number Mfr . Code Name & Description Qty Serial No.
Mechanical Parts List 10–12 1780R-Series Service Manual.
1780R–Series Figure 1 Exploded View.
1780R–Series Figure 2 Cabinet & Accessories.
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Tektronix 070-8030-01 è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Tektronix 070-8030-01 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Tektronix 070-8030-01 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Tektronix 070-8030-01 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Tektronix 070-8030-01, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Tektronix 070-8030-01.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Tektronix 070-8030-01. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Tektronix 070-8030-01 insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
