Manuale d’uso / di manutenzione del prodotto 340 SC del fabbricante JVC
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SERVICE MANUAL Model 330 Model 340 SC Model 370 SC Hughes-JVC Technology Corporation 2310 Camino Vida R oble, Carlsbad, C A 92009-1504 ☎ 760-929-5300 F AX 760-929-5410 e - ✉ servic e@hjt.
iii Model 330, 340SC and 370SC Service Manual Manufacturer: Hughes-JVC Technology Corporation 2310 Camino Vida R oble Carlsbad, C A 92009-1504 USA Hughes-J VC declares that this product conforms to th.
Safety Model 330, 340SC, and 370SC Service Manual v Safety Information Introduction Before operating or working on a Model 330, 340SC and 370SC Projector, especially with the cover off, please read this safety information section thoroughly .
Safety vi Model 330, 340SC, and 370SC Service Manual must accept any interference received including interference that may cause undesired operation. Operation of this equipme nt in a residential are a is likely to cause ha rmful interference, in which case the use r will be required to correct the inte rference at their own expense.
Safety vii Model 330, 340SC, and 370SC Service Manual Avoid Projector Angles of 15 ° to 23 ° Due to voids in the prism fluid there is a dead zone of 19 ° ± 4 ° . For this reason, avoid projector angles of 15 ° to 23 ° . Maximum Projector to Screen Angle is 15 ° The maximum vertical tilt ang le from projector to scree n is 15 ° .
Safety viii Model 330, 340SC, and 370SC Ser v ice Manual WA RNING! !! High temperatur e, ultravi olet and infrared li ght. Refer all serv ice to factory author ized per sonnel. Ultraviolet radiation, dangerous glare, and hig h internal gas pressure is present at the Xenon Arc La mp.
Safety ix Model 330, 340SC, and 370SC Service Manual ! CRT y oke assemblies and other proximity electrical assemblies, components and wiring—if performing the y oke rotation or width adjustment (outline d in Section 3.2), alway s use an ! ANSI /ASTM 10,000 volt rated safety glove.
Safety x Model 330, 340SC, and 370SC Service Manual WA RNING! !! Various procedures in thi s manual inv olve the remov al and replacement of system subassembli es. Ensure that the projector AC power plug is removed from the AC outl et prior to attempting any of these procedures.
Safety xi Model 330, 340SC, and 370SC Service Manual.
Chapter 1---Introduction Model 330, 340SC and 370SC Service Manual 1-1 1.0 Introduction This Model 330, 340SC and 370SC Service Manual combines three (3) similar projector models into one (1) reference book, and should be used in conjunction with the appropriate projector Operator’s Manual.
Chapter 1---Introduction 1-2 Model 330, 340SC and 370SC Service Manual RTG Raster Timing Generator SCB Sy stem Control Board SPS Sy stem Power Supply TTL Transistor-Transistor Log ic VAB Video Amplifi.
Chapter 1---Introduction Model 330, 340SC and 370SC Service Manual 1-3 Printed Circui t Boards 330 340SC 370SC Video Amplifier Board 103774 103774 103774 Sy stem Controller Board 104668 104668 104668 .
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Manual 2–1 2.0 Functional Descriptions Contents 2.1 Cover and Base............................................................................................ 2–2 2.2 External Power Requirements .
Chapter 2—Functional Descript ions 2–2 Model 330, 340SC, and 370SC Service Manual System Power Supply Line Vo ltag e System Controller Lamp Ignito r Video Processor Low Vol tage Power Supply Arc L.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Manual 2–3 WA RNING! !! The HJT Model 330, 340SC and 370SC projectors use hi gh vol tages and high cur rents. Operation w ith covers removed ex poses personnel to these danger ous conditions and may resul t in serious injur y or death.
Chapter 2—Functional Descript ions 2–4 Model 330, 340SC, and 370SC Service Manual horizontal and 45Hz to 120Hz vertical. The projected image is continuously variable from 6 ft to 60 ft over throw distances (varies by projector model) from 10 ft to over 360 ft.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Manual 2–5 The Raster Timing Generator provides timing signals to the Sy stem Controller Board, se lects the appropriate inc oming sy nc sig nal and produces the timing signals for controlling the geometry of the raster.
Chapter 2—Functional Descript ions 2–6 Model 330, 340SC, and 370SC Service Manual All of the SPS output voltag es except Arc La mp power are indicated by a L ED display (see ). The LEDs are located on a bar-ty pe display on the backplane at the left side of the card cage.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Manual 2–7 The Arc La mp power supply is a current-controlled supply with an open circuit voltage of about 170V. When the Arc L amp is operating at steady state, the power supply provides the current set by the technician.
Chapter 2—Functional Descript ions 2–8 Model 330, 340SC, and 370SC Service Manual 2. +24V Standby and Arc L amp power supplies turn on. 3. When Arc Lamp lig hts (run voltage sensed by a window comparator in the SPS), SPS pulls /L AMPL I T line low.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Manual 2–9 *Current depends on projector model (see Table 0-1 in Safety Chapter).
Chapter 2—Functional Descript ions 2-10 Model 330, 340SC, and 370SC Serv ice Manual When the Arc Lamp supply first turns on, it supplies 170V to the ignitor. The ignitor then senses this voltage , activates it’s on-board supply , and produces a 1 µ S, 38KV pulse to the Arc L amp.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Model 2-11 High Voltage Pow er Supply The High Voltage Power Supply is a DC-DC converter (see Figures 2-6 and 2-7) and is located on the left side of the CRT housing. I t provides all necessary voltages for the CRTs except the cathode drive, which comes from +107V from the SPS.
Chapter 2—Functional Descript ions 2-12 Model 330, 340SC, and 370SC Serv ice Manual The HVPS provides several voltages to the CRTs: Anode Grid 1 Grid 2 Focus RED ANOD E GREEN ANODE BLUE ANODE RED FO.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Model 2-13 CRT anode voltages are not user controllable. They are fixed at 32KV with a maximum output of 2.1mA total or 0.7mA per CRT. The anode voltage is the primary acceleration volt age for the CRT.
Chapter 2—Functional Descript ions 2-14 Model 330, 340SC, and 370SC Serv ice Manual As with the other indicators on that LED bar, the L ED is in series with current limiting resistor, so a lit L ED indica tes only the presence of a voltage, not necessarily the correct voltage.
Chapter 2—Functional Descript ions Model 330, 340SC and 370SC Service Model 2-15 The card cage is hinged in the rear to all ow it to be folded backward for access t o the CRT housing (when folding the card cag e backward be sure that nothing is plugge d into the rear electronic jacks or the plugs could be severely damaged).
Chapter 2—Functional Descript ions 2-16 Model 330, 340SC, and 370SC Serv ice Manual Figure 2-10 on the following pag e provides an overall view of how the raster is produced. Details on the individual PCBs are provided in separate sections in this chapter.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-17 Figure 2-10 Raster Generation Block Diag ram.
Chapter 2 — Functional Descript ions 2-18 Model 330. 340SC, and 370SC Serv ice Manual Raster Timing Generator Board (RTG) p/n 100568 The Raster Timing Generator board is loca ted in the electronics ca rd cage a nd plugs into the backplane.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-19 The following functions are provided by the RTG: I nternal sy nc generation. Sy nc detection and selection. Serration and equalization pulse removal. Timing clock pulse generation.
Chapter 2 — Functional Descript ions 2-20 Model 330. 340SC, and 370SC Serv ice Manual Serrati on and Equaliz a ti on Lockout The Serration and Equalization Lockout takes a composite sy nc sig nal and removes any equalization and serration pulses from it.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-21 shaped to be three (3) horizontal periods in length. This signal, /VSYNCSC (pulse- shaped vertical sy nc) is then sent to the SCB and the VPB.
Chapter 2 — Functional Descript ions 2-22 Model 330. 340SC, and 370SC Serv ice Manual method as the /CORSTRT signal but has a separate command from the SCB. I t controls the timing of the top and bottom pincushion correction, top and bottom key stone correction, and horizontal linearity correction.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-23 I T Blank Commanded position of top blanking. I B Blank Commanded position of bottom blanking. I /STBP Command for DC restore timing on either leading or tra iling edge of sy nc pulse.
Chapter 2 — Functional Descript ions 2-24 Model 330. 340SC, and 370SC Serv ice Manual /Hx112 112 times the horizontal frequency for convergence and Z axis correction address generator clocking . (TP 20) /CORSTRT Signal used to start the convergence and overlay address generators during each horizontal sweep.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-25 Sy stem Pow e r Supply Inputs Description +15V Power for the analog section of the RTG including the PL L . (TP 30) -15V Power for the analog section of the RTG including the PL L .
Chapter 2 — Functional Descript ions 2-26 Model 330. 340SC, and 370SC Serv ice Manual Figure 2-12 Horizontal Deflection Board Block Diagram Vertical Oscillator The function of the vertic al oscillator is to lock to the vertic al signal, /VFB ST, sent by the RTG, and produce a pulsed output, VERTDR, of the same frequency .
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-27 The purpose for having an oscillator for the vertica l sweep circuit is to maintain a swe ep even in the event of loss of vertical sy nc signal to prevent damage to the CRT.
Chapter 2 — Functional Descript ions 2-28 Model 330. 340SC, and 370SC Serv ice Manual The first is an input derived from the F to V in the horizontal PLL circuit. This presets the output of the supply to a voltage that will provide a nominal raster size for the horizontal frequency applied.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-29 The three (3) horizontal deflection coils (B, G, and R) are driven in parallel by a single drive circuit and transistor. This is the reason for the inability to remotely c ontrol the three (3) raster widths independently .
Chapter 2 — Functional Descript ions 2-30 Model 330. 340SC, and 370SC Serv ice Manual Bus I/O Information Description IIC I Serial data load Command to the serial data receiver t hat the incoming data is to be read. Seria l I HPHASE Commanded horizontal phase of picture.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-31 IIC D AT A I IC data line. Bi-directional serial line for sy nchronous data transfer between SCB and other circuit boards. See detailed description for list of signals transferred and data direction.
Chapter 2 — Functional Descript ions 2-32 Model 330. 340SC, and 370SC Serv ice Manual Sy stem Pow e r Supply Inputs Description +48V Power for horizontal deflection +15V Power for the analog section.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-33 Vertical raster cent ering. Top and bottom pincushion correction. Top and bottom key stone adjustment. Horizontal overall and edge linearity adjustment. Le ft and right pincushion and key stone correction waveform generation.
Chapter 2 — Functional Descript ions 2-34 Model 330. 340SC, and 370SC Serv ice Manual Figure 2-13 Vertical Deflection Board Vertical Preamps The vertical preamps (B, G, and R ) each generate a ramp signal with the frequency determined by the incoming signal VERTDR from the Horizontal Deflection Board.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-35 Vertical A mplifiers The Vertical Amplifiers ta ke the ramp signa ls generated by the Vertical Preamps and provide further modification prior to driving the vertical deflection coils.
Chapter 2 — Functional Descript ions 2-36 Model 330. 340SC, and 370SC Serv ice Manual A form of the vertical frequency parabolic waveform that is derived from the red ramp is also sent out to the VPB as VPARAB for use in the dy namic focus circuit.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-37 Correctio n A mp lifiers There are six (6) correction amplifiers. Each one receives a real-time convergence correction signal: RXCORR. RYCORR. GXCORR. GYCORR. BXCORR.
Chapter 2 — Functional Descript ions 2-38 Model 330. 340SC, and 370SC Serv ice Manual Table 2-8 VDB Serial Bus I nformation Bus I/O Information Description IIC O Front/Rear convergence indication TTL level that indicates whether the X- convergence is in front screen mode (high) or rear screen (pulled low).
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-39 +SERDATA Serial data transfer. Unidirectional, differential, sy nchronous serial data communication line. Used for transferring data from SCB to other circuit boards.
Chapter 2 — Functional Descript ions 2-40 Model 330. 340SC, and 370SC Serv ice Manual Outputs Description FL RCL I NG Low sig nal generated from jumper on connector J400 indicates non- inverted operation. GEOCORR Output from L/R pincushion and key stone correction circuits.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-41 Interlocks and Shutdow ns Input HSENSRED - Used to shut down the CRT beams in the event of horizontal sweep failure. HSENSGRN - Identical to HSENSERED. HSENSBLU - I dentical to HSENSERED.
Chapter 2 — Functional Descript ions 2-42 Model 330, 340SC and 370SC Service Manual Figure 2-14 Video Generation Block Diag ram. This diagram provides an overall view of how the image is produced. Separate sections of this chapter detail the individual PCBs.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-43 Video Processor Board P/N 104672 (VPB) The Video Processor Board (VPB) plugs into t he electronics card cage. It is the rear-most card in th e card cage. The VPB is the only card in the card cage that is held in by fasteners.
Chapter 2 — Functional Descript ions 2-44 Model 330. 340SC, and 370SC Serv ice Manual Figure 2-15 Video Processor Board, Block Diag ram Decoder The optional decoder is a daughter board installed on the VPB. Since the VPB can only operate on an RGB/sy nc signal, use of the decoder is necessary in order for the projector to use a composite signal.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-45 further use in the Video Processor Board. The I IC bus is used by the decoder to select either Channel 3 (NTSC) or Channel 4 (S-Vid). The two (2) signals are multiplexed together on the decoder board for export to the Video/Sy nc Mux .
Chapter 2 — Functional Descript ions 2-46 Model 330. 340SC, and 370SC Serv ice Manual Adding a DC offset to the output of the amplifier controls brightness. The brightness is controlled by the SCB via the II C interface. The operator control s contrast level by pressing the B RI GHT button and using the up and down arrows on the remote control.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-47 A defective video amp is detected by the state of the /RVI DOK, /GVIDOK, and /BVI DOK signals arriving from the VABs. A loss of +5V power to the VPB is detected by observing it internally to this circuit.
Chapter 2 — Functional Descript ions 2-48 Model 330. 340SC, and 370SC Serv ice Manual Video signal cutoff is accomplished by pulling blanking to zero. ILA ® Bias ILA ® Assembly biasing is accomplished by generating a pseudo-square-wave with frequency set by the operator.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-49 IIC O VI DOK Tells SCB that no VABs are reporting problems. IIC O SWEEPOK Tells SCB that all swe eps are opera ting. IIC O BEAMDET Tells SCB that bea m current limiting is occ urring.
Chapter 2 — Functional Descript ions 2-50 Model 330. 340SC, and 370SC Serv ice Manual RTHRESH Threshold (Z-axis offset) correction information for red. Real time data at 0V to 1V. GTHRESH Similar to RTHRESH. BTHRES H Similar to RTHRESH. +SERCL K Serial data transfer clock (+).
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-51 Vertical Deflection B oard Inputs Description VPARAB A periodic, positive-g oing, parabolic wa veform with the vertical scan frequency , used for dy namic focus.
Chapter 2 — Functional Descript ions 2-52 Model 330. 340SC, and 370SC Serv ice Manual BVIDCH1 Blue video input to channel 1. BVIDCH2 Blue video input signal to channel 2. HSYNCCH1 Horizontal or composite sy nc signal to channel 1. HSYNCCH2 Horizontal or composite sy nc signal to channel 2.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-53 High Voltage Pow e r Supply Outputs Description VDFOCUS Parabolic waveform of vertical frequency . HDFOCUS Parabolic waveform of horizontal frequency modulated by the VDFOCUS waveform.
Chapter 2 — Functional Descript ions 2-54 Model 330. 340SC, and 370SC Serv ice Manual high resulting in shutdown of grid bias at the Vide o Amplifier Boards. Also, the SWEEPOK status bit will be transmitte d as a low to the SCB. /GVI DOK Similar to /RVI DOK.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-55 Circuit failure detec tion. Beam current sense. Arc protection. This section uses Figure 2-16 for reference. The description provides information to perform module-level troubleshooting.
Chapter 2 — Functional Descript ions 2-56 Model 330. 340SC, and 370SC Serv ice Manual Beam Current Sense The cathode current is sensed at the output of the video amplifier, then filtered and amplified so that the output is a 1mV/1uA signal averaged over several horizontal lines (the number of lines depending on the horizontal frequency ).
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-57 General I/O This section provides a comprehensive description of the inputs to and outputs from the VAB.
Chapter 2 — Functional Descript ions 2-58 Model 330. 340SC, and 370SC Serv ice Manual Table 2-11 Video Amplifier Board I /O Signals Video Processor Board Input Description VI N COAX input from VPB via the backplane. Video signal of 1V peak- to-peak maximum.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-59 Sy stem Pow e r Supply Inputs Description +107V Power supply to cathode drive amplifier. +6.3V Power supply to filament. +15V Power for analog components. -15V Power for analog components.
Chapter 2 — Functional Descript ions 2-60 Model 330. 340SC, and 370SC Serv ice Manual General Functi onal Descr iption The sy stem controller board receives ex ternal commands, int erprets those com.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-61 Figure 2-17 Sy stem Controller Board, B lock Diagram CPU The central processor (CPU) is a Motorola MC68302 embedded controller and is the main controlling component of the projector.
Chapter 2 — Functional Descript ions 2-62 Model 330. 340SC, and 370SC Serv ice Manual As the CPU processes information, it is stored in the Working and Compressed Memory . This includes all te mporary storage as well as the cha nnel data that the operator sets while ‘ twee king up ’ the projector.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-63 The digital informa tion that is to be used for raster c orrection is stored in bit-map form. The bit-map is 96 fields (out of 112) wide by the number of horizontal lines in a frame wide.
Chapter 2 — Functional Descript ions 2-64 Model 330. 340SC, and 370SC Serv ice Manual drives the correction amplifiers. The raw (compressed) data is stored in the WCM while the smooth (expanded) data is stored in the EXM.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-65 each line in the raster. The starting address is timed by the /MAPST signal. When that comes along, it indicates the top of the raster is beginning so the address generator should beg in counting at the beginning.
Chapter 2 — Functional Descript ions 2-66 Model 330. 340SC, and 370SC Serv ice Manual There are three (3) ports for receiving I R radiation. One (1) is located on the front of the projector just above the Green projection lens and the other two (2) are located on the rear panel .
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-67 Table 2-12 Sy stem Controller Board I /O Signals Video Processor Board I/O Description IIC D AT A Data line for transferring the following information (I = input, O = output).
Chapter 2 — Functional Descript ions 2-68 Model 330. 340SC, and 370SC Serv ice Manual Raster Timing Generator I/O Description IIC D AT A Data line for transferring the following data (I = input, 0 = output). The input data are associated with an interrupt pulse.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-69 SYSCL K 4.05MHz clock signal I I CCLK Clock signal for the I I C data bus. +SERCL K Serial data transfer clock. -SERCL K Serial data transfer clock. +SERDATA Serial data transfer.
Chapter 2 — Functional Descript ions 2-70 Model 330. 340SC, and 370SC Serv ice Manual Horizontal Deflection B oard I/O Description IIC D AT A Data line for transferring the following data (I = input, O = output).
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-71 /L EDBL 1 Brig htness /L EDBL O Brig htness RS-232 Interface Signals RS232 #1 RS232 #2 Description RXD1 RXD2 Receiv.
Chapter 2 — Functional Descript ions 2-72 Model 330. 340SC, and 370SC Serv ice Manual Figure 2-18 Backplane I nterface Block Di agram 2.7 Optical Section The Optical sec tion consists of the CRT Assembly , the Arc L amp Assembly , and the Optical subassemblies, which provides the image to be viewed on the screen.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-73 light. The vertically polarized light then passes throug h the prism to the projector lens. The I LA ® assembly combines the input signal from the CRT with the high intensity light from the arc lamp.
Chapter 2 — Functional Descript ions ! 2- 2-74 HJT Model 330, 340SC, and 370SC Service Manual CRT Rela y Lens IL A Projecti on Lens Screen CRT Imag e Combine d Image and Hi gh Intens ity Ligh t=Brig.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2-75 Prism The prism receives the high intensity light from the xenon arc lamp and polarizes the light horizontally . The prism reflects virtually all of this lig ht toward the I L A ® assembly .
Chapter 2 — Functional Descript ions 2-76 HJT Model 330, 340SC, and 370SC Serv ice Manual Optical Subassemblies Cold Mirror The Cold Mirror lets most of the infrared light pass through and reflects the rest of the light toward the prism through an ultraviolet filter/condensing lens, dichroic mirrors and down-steering mirrors.
Chapter 2 — Functional Descript ion Model 330, 340SC and 370SC Service Manual 2- 2-77 horizontally polarized light is sent through the liquid cry stal lay er of the I L A ® assembly, reflected by a dielectric mirror surface, and then sent back through the liquid cry stal lay er on the way out of the I LA ® assembly .
Chapter 2 — Functional Descript ions 2-78 HJT Model 330, 340SC, and 370SC Serv ice Manual Figure 2-21 Simplified illustration of the Series 300 Projector optical path The phase modulated light exiti.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-1 3.0 Service Adjustments Contents 3.1 Service (Cover-Off) Power-On Sequence .................................................. 3-1 3.2 CRT Yoke Rotation.......................
Chapter 3---Service A djustments 3-2 Model 330, 340SC, 370SC Service Manual with the r emote. Then turn the projector power back off with the remote. This all ows pow er to be reappli ed to the fans to cool the arc lamp that r emains very hot even after pow er is removed.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-3 1. Press the Power ON key to turn on the projector (press both power key s simultaneously if using the tethered remote ). The I gnitor circuit will ig nite the arc la mp and power will be applied to the electronics sy stem.
Chapter 3---Service A djustments 3-4 Model 330, 340SC, 370SC Service Manual Figure 3-2 View of the CRT Assembly showing deflection y okes, width coils, CRTs and Video Amplifiers. 5. Remove the 2.5mm Allen screw holding the electronics module in place and tilt the electronics module (see CAUTI ON following) back to expose the CRT necks and y oke.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-5 9. View B. 10. Rotate the blue CRT deflection y oke to achieve a level image at the center of the screen (it should be parallel to the green and red gr id center lines). 11. Retighten the y oke clamp so it is secure.
Chapter 3---Service A djustments 3-6 Model 330, 340SC, 370SC Service Manual R 328 R 411 R 311 R 211 R 228 R 428 Blu e Vertical Siz e Red Vertical Linea rity Blu e Vertical Linea rity Green Vertical Li.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-7 3.5 Horizontal Size Tracking The horizontal width coils are factory adjusted and will not norma lly need adjustment. I n gene ral, if the R and B vertic al lines are within two (2) crossha tch lines of each other, they can be brought in line with the Convergence procedure.
Chapter 3---Service A djustments 3-8 Model 330, 340SC, 370SC Service Manual 8. After Yoke rotation, readjust Geometry , Convergence and CRT Mechanical focus.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-9 1. Select IL A ® Menu, from the Main Menu. 2. Select Frequency Adjust from the I L A ® Bias Menu. 3. A frequency of 1.8 kHz is acceptable for general video viewing. A lower frequency (as low as 1.
Chapter 3---Service A djustments 3-10 Model 330, 340SC, 370SC Service Manual the mechanical CRT focus should not be adjusted. I f the image is not sharp enough, proceed with the CRT mechanical focus adjustment below. There are three (3) adjustment rods for each C RT making a total of nine (9).
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-11 Figure 3-5 On-Screen Focus Points. Adjust t he focus rods for best focus at these points. Using Test Pattern 8, H-Grid, adjust t he focus rods for the best mechanical focus as follows: 1.
Chapter 3---Service A djustments 3-12 Model 330, 340SC, 370SC Service Manual 9. Cutoff R and view B. 10. Repeat Steps 2-4 for Blue. 3.8 Electronic Focus The Electronic Focus adjustment is factory -set and should not need to be adjusted.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-13 Figure 3-6 Electronic Focus and G2 Adjustments NOTE: The Electronic focus and G2 adju stments are located on the hi gh voltage power supply on the rear-left side of the projector under the cover.
Chapter 3---Service A djustments 3-14 Model 330, 340SC, 370SC Service Manual indicates the proper location for front and rear projection. The HJT Series 300 Projector is shipped with the jumper plug inserted in J500 for front projection. For a rear projection setup, insert this jumper plug into J501.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-15 4. Pull out the Horizontal Deflection board and verify that the horizontal scan jumper is properly inserted for front (J500) or rear (J 501) projection, depending on y our application (refer to Figure 3-6 and Table 3-1).
Chapter 3---Service A djustments 3-16 Model 330, 340SC, 370SC Service Manual 4. Pull out the Vertical Deflection Board and verify the vertical jumpers are inserted in the correct jacks, depending on y our application (refer to Table 3-1 and Figure 3-7).
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-17 8. Adjust Menu Position using the Gre y Scale and the Timing Setup Menu. (Refer to the Menu Position section). To set G2: 1. Cut off R and B and view G. 2. Select the Plug e test patte rn.
Chapter 3---Service A djustments 3-18 Model 330, 340SC, 370SC Service Manual 3.11 A rc Lamp A lignment and Focus The Arc La mp must be realigned and refocused whenever the lamp is replaced or becomes defocused or misaligned from phy sical shock to the projector.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-19 4. When the hot spot is at the center of the screen, retighten the four (4) Arc La mp holding screws. Figure 3-10 Model 330 Arc L amp Adjustments (the Heat Sink has been removed for photograph).
Chapter 3---Service A djustments 3-20 Model 330, 340SC, 370SC Service Manual Model 340SC and 370SC A rc Lamp Alignment and Focus To check Model 340SC and 370SC Arc La mp alignment, observe the anode shadow on the blue dichroic mirror (the blue dichroic mirror is the first mirror after the condensing lens).
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-21 Figure 3-9. Model 340SC and 370SC A rc Lamp A djustments 3. Verify that the condensing (collimating) lens assembly has not moved (see Figure 4-1 or 4-2 and Photo 4-4). Check to see if the assembly is loose.
Chapter 3---Service A djustments 3-22 Model 330, 340SC, 370SC Service Manual 2. Measure the numbe r of millivolts between pins 3 and 4 on SPS J505. NOTE: This circuit is designed so tha t the number of millivolts between these pins (for Models 340 and 370, it is millivolts divided by 10) represents the lamp current in amps.
Chapter 3 ---Service Ad justments Model 330, 340SC, 370SC Service Manual 3-23.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-1 4.0 Maintenance Remove/Replace) Contents 4.1 Maintenance Rem ove/Replace) .................................................................... 4-1 4.2 Projector Covers ............
Chapter 4—Maintenance 4-2 Model 330. 340SC, 370SC Serv ice Manual ➨ Wait at least a minute after turning off power and removing the power plug for the high voltag e to bleed off. ➨ Observe all cautions and warnings printed on labels. ➨ Observe proper electrostatic discharge procedures.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-3 Figure 4-1 Major components of the Model 330 Projector..
Chapter 4—Maintenance 4-4 Model 330. 340SC, 370SC Serv ice Manual Figure 4-2 Major components of the Model 340SC and 370SC Projectors..
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-5 4.2 Projector Cov ers To remove the two-piece proj ector cover: CA UTION! W hen removing the projector cov ers do not bump any inter nal components of the projector.
Chapter 4—Maintenance 4-6 Model 330. 340SC, 370SC Serv ice Manual NOTE: This filter can also be removed, while leaving the re ar cover in place, by removing the two screws at the t op of the side panel where the filter is located. Slide the panel up and out.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-7 Figure 4-3 Model 330 Arc L amp and I gnitor Assembly (P/N 900611S), shown without Heat Sink attached) 5. Remove the three (3) Hex-head screws that attac h the I gnitor Assembly to the Arc L amp rails.
Chapter 4—Maintenance 4-8 Model 330. 340SC, 370SC Serv ice Manual Table 4-1 I gnitor Connections for Model 330 Projector Ignitor Terminal Location on Ignitor Wire Color Wire goes to: POS IN P UT Right Side of I gnition Coil Red J 504 (+) terminal on Sy stem Power Supply .
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-9 10. Remove the two (2) ground straps (not shown in Photo 4-2 or Photo 4-3) from the top, right side of the Arc L amp assembly housing. L eave these straps attached to the Collimating L ens housing.
Chapter 4—Maintenance 4-10 Model 330. 340SC, 370SC Serv ice Manual their correct t erminals in accordance wi th the way they were labeled above. Be sure that the connections are tightened securely . NOTE: Whenever an Arc Lamp is replaced the Collimating L ens may need to be readjusted to obta in maximum brightness.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-11 Example: If the center brightness is 20 foot-candles, the ideal edge brightness should be 10 foot-candles. CA UTION! Do not allow rol l-off to be greater than 4:1 or damage to the Col d Mirror could result.
Chapter 4—Maintenance 4-12 Model 330. 340SC, 370SC Serv ice Manual Figure 4-7 Sy stem Power Supply (rig ht side of projector) 7. Remove the grounding cable from the right side of the power supply ( see Figure 4-7 ).
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-13 J501 J500 J502 Wire Bu ndle Clam p CARD CAGE SYSTEM POWER SUPPLY ARC LAMP ASSEMBLY HIGH VOLTAGE POWER SUPP LY TIE WR AP BACKPLANE ANODE LE ADS CAPT IVE SC REWS } SYSTEM P OWER SUPPLY CONNECTORS Figure 4-8 Sy stem and HV Power Supply (left side of projector) 4.
Chapter 4—Maintenance 4-14 Model 330. 340SC, 370SC Serv ice Manual 4. At the rear of the projector, remove the three (3) filter housing screws (located under the rear lip of the projector base-plate) and remove the filter housing.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-15 4.7 Cathode Ray Tube (CRT) Three (3) cathode ray tubes are located in the CRT assembly below the card cage and sy stem power supply . The following procedure is used to remove any CRT: WA RNING !!! Handle a CRT wi th extreme caution.
Chapter 4—Maintenance 4-16 Model 330. 340SC, 370SC Serv ice Manual module. This is not absolutely necessary and it is up to the technician’s discretion whether or not to remove it (Section 4.5). 3. After removing the Sy stem Power Supply , remove the sy stem power supply mounting plate that covers the top front area of the CRT Assembly .
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-17 Figure 4-10 Model 340SC and 370SC CRT Assembly Figure 4-11 CRT Z- Axis Focus Adjustment Rods (circled ).
Chapter 4—Maintenance 4-18 Model 330. 340SC, 370SC Serv ice Manual Model 340SC and 370SC CRT Removal To remove a Model 340SC and 370SC CRT ( see Figure 4-10 ): 1. Unplug the projector. Wait at least one (1) minute before proceedi ng for the high voltage to bleed off.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-19 3. Ensure that all control cables are disconnected from the back of t he cardca ge then tilt the c ard cag e back to expose the inside of the CRT housing. 4. Unplug and label the five cables connected to the VAB.
Chapter 4—Maintenance 4-20 Model 330. 340SC, 370SC Serv ice Manual 7. Perform a CRT mechanical focus adjustment (Section 3.7) and y oke alignment (Section 3.2) after y oke replacement. 4.10 High Voltage Pow er Supply (HVPS) The HVPS is located on the left side of the projector next to the CRT housing assembly .
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-21 4.11 Card Cage (Printed Circuit Boards) The card cage is located at the rear of the projector above the CRT housing. CA UTION! Printed circuit boards i n the electronics module are susceptible to electr ostatic damage.
Chapter 4—Maintenance 4-22 Model 330. 340SC, 370SC Serv ice Manual To ensure a proper connection between J11 and P11 follow the procedure below: Before installing the Horizontal Deflection B oard, remove the Vertic al Deflection Board. This allows for a full inspection of the proper connection of J11 and P11.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-23 4.13 Projection Lens Projection lenses are l ocated at the front of th e projector and are held in place by friction clamps called Le ns Locking Rods. Figure 4-12 Projection L ens L ocking Rods To remove a projection lens ( see Figure 4-12 ): 1.
Chapter 4—Maintenance 4-24 Model 330. 340SC, 370SC Serv ice Manual Table 4-2 for reference to part numbers, if necessary ..
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-25 Table 4-2 Len s Replacement Lens Throw Lens Part Number or Designation Ratio Red Green B lue 1.
Chapter 4—Maintenance 4-26 Model 330. 340SC, 370SC Serv ice Manual Figure 4-13 Sy stem Controller Board SRAM Chips L ocation. CA UTION! Never place the socket batt ery on a metal surface! The positiv e and negativ e terminals of the battery w ill short out and destroy the battery! 3.
Chapter 4—Maintenance Model 330, 340SC, and 370SC Service Manual 4-27 4.15 Recommended Spares I t may be advisable to maintain a supply of spares to max imize performance. This is particularly important if projectors are being operated on a continuous basis or when multiple projectors ar e used.
Chapter 5---Troubleshooting 5-1 Model 330, 340SC, and 370SC Serv ice Manual 5.0 Troubleshooting Contents 5.1 General I nformation .................................................................................... 5-1 5.2 Troubleshooting ............
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-2 Table 5-1 Error Codes for the Model 330, 340SC and 370SC Projectors LED On-Screen Text Description Codes shown along with operator message s. b A RAM BATTERY IS LO W Memory problem—data may be lost if power-off.
Chapter 5---Troubleshooting 5-3 Model 330, 340SC, and 370SC Serv ice Manual LED On-Screen Text Description x Problem with decoder module data. y Problem with decode input. # Loss of horizontal sweep detected. Codes indicating a software bug—sy stem should keep running.
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-4 STB +5volts or +24volts are still not present after verify ing that the circuit breaker is on and the projector is plugge d in, the Sy stem Power Supply may be defective.
Chapter 5---Troubleshooting 5-5 Model 330, 340SC, and 370SC Serv ice Manual 5.3 Break Points Break Points (or Trap Processing) handle internal interrupts g enerated by the processor, such as: bus errors, illegal instruction, and divide by zero commands.
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-6 Resetting the Proj ector The projector’s processor must be reset if a break (trap) condition occurs. The processor can be reset by either of the following methods: 1. Cy cle main power off, then back on (allow ten minutes for Arc La mp to cool).
Chapter 5---Troubleshooting 5-7 Model 330, 340SC, and 370SC Serv ice Manual 5.4 Main Menu Structure 1. CH AN NE L ME NU > 2. ST ATU S MENU 3. ILA M ENU > 4. D IAGNOSTIC MENU > 5. TI MIN G MENU > 6. VIDEO QU ICKSET > 7. GR APHIC ENHANCE > CHAN NEL MENU 1.
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-8 Table 5-5 Troubleshooting Guide Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual No Pow er Main input power. Reset circuit breaker. 3-1 Sy stem Power Supply main circuit breaker.
Chapter 5---Troubleshooting 5-9 Model 330, 340SC, and 370SC Serv ice Manual Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual L EDs 200, 300, or 400 on the vertical deflection are unlit. Replace Vertical Deflection Board.
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-10 Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual Image out of f ocus Spacer balls not visible. Set projection lens focus so ILA ® spacer balls are visibl e.
Chapter 5---Troubleshooting 5-11 Model 330, 340SC, and 370SC Serv ice Manual Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual Video has shadow on left or right edge. Correct using M ENU P OSITION and P INCUSHION P OSITION .
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-12 Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual Bright Red, Green or Blue area on screen limite d to corners or edge. Adjust I LA ® Assembly Bias and S HADING .
Chapter 5---Troubleshooting 5-13 Model 330, 340SC, and 370SC Serv ice Manual Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual Data lost when projector is turned off and back on. SCB socket batt eries weak. “RAM BATTERY L OW” may appear on screen.
Chapter 5---Troubleshooting Model 330, 340SC, and 370SC Service Manual 5-14 Problem and Sy mptom to Check Possible Solution Serv ice Manual Operator Manual I ntermittent operation. Replace I/R remote battery or move closer to projector. I f not possible to move closer to projector, use an I /R repeater for distances of 50’ or more.
Glossary Model 330, 340SC, and 370SC Service Manual Glossary of Terms Adjust Flat Fld Flat field test pattern used for shading purposes, (adjusts in 7º increments). Amor phous Without definite form; not cry stallized. Arc Lamp The xenon arc lamp in the Series 300 series projectors.
Glossary Model 330, 340SC, and 370SC Service Manual Cold Mirror Mirror that absorbs infrared light so that its reflection contains only "cold' light that does not tran smit appreciable hea t. As a result of this absorption of infrared heat radiation, "cold" mirrors get quite hot.
Glossary Model 330, 340SC, and 370SC Service Manual Gray Scale Test pattern of black-to-white gradation bars. The more levels of gray scale that can be handled, the more realistic an image can be display ed, especially a photograph that has been scanned into the computer.
Glossary Model 330, 340SC, and 370SC Service Manual Intensity Concentration of information or what would be seen if a black and white version of the image is display ed. Interlacing The t echnique that refreshes a display screen by alternately display ing all the odd lines (field one) and then all the even lines (field two) of one frame.
Glossary Model 330, 340SC, and 370SC Service Manual Lume n A unit of measure of the flow, or rate of emission, of light. An ordinary wax candle generates 13 lumens while a 100 watt bulb generates 1,200 lumens. Luminanc e Abbreviated as "Y." The portion of the sig nal that contains the black and white information, which affects brightness.
Glossary Model 330, 340SC, and 370SC Service Manual Phase adjustm ent Positions the input image (test pattern, video, graphics, etc.) on the CRT raster. I f the phase is misadjusted, the ima ge may "wrap around" the edg es or be positioned off the screen.
Glossary Model 330, 340SC, and 370SC Service Manual 2) A display misadjustment that results in unnaturally bright colors. Scan To scan is to move a cross a picture frame a line at a time, either to detect the image, as in an analog or digital camera, or to refresh a CRT-based video screen.
Glossary Model 330, 340SC, and 370SC Service Manual temporarily with the Ex ecutive I /R remote. Vertical Resolution The amount of detail that can be perceived in the vertical direction; the maximum number of alte rnating white and black horizontal lines that can be counted from the top of the picture to the bottom.
Glossary Model 330, 340SC, and 370SC Service Manual.
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 JVC 340 SC 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 JVC 340 SC - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso JVC 340 SC imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul JVC 340 SC ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il JVC 340 SC, 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 JVC 340 SC.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il JVC 340 SC. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo JVC 340 SC 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.
