Manuale d’uso / di manutenzione del prodotto 250 del fabbricante JVC
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SERVICE MANUAL Model 250 Projector Phone: (760) 929-5300 Fax: (760) 929-5410 2310 Camino Vida Roble Carlsbad, California 92009.
ii Model 250 Service Manual DECLARATION OF CONFORMITY PER ISO/IEC GUIDE 22 AND EN 45014 Manufacturer : Hughes JVC 2310 Camino Vida Roble Carlsbad, Ca 92009 USA Hughes-JVC declares that this product co.
Model 250 Projector Ser vice Manual iii Table of Contents Safety Information .................................................................................... v Chapter 1 Introducti on 1.1 Safety ....................................................
iv Model 250 Service Manual 6.5 I R Detectors ............................................................................................ 6-4 6.6 EMI Shield .............................................................................................
Chapter 1---Introduction Model 250 Service Manual 1-1 1.0 Introductio n Contents 1.1 Safet y............................................................................................................ 1-1 1.2 Updates ..................................
Chapter 1---Introduction 1-2 Model 250 Service Manual When performing procedures th at call for the projector’s powe r to be on, alwa ys wear high voltage gloves (ANS I/ASTM 10,000 volt rated) when workin g around the CRTs, Arc Lamp or power supplies.
Chapter 1---Introduction Model 250 Service Manual 1-3 SECAM Sequentia l couleur a memoire (sequencial color with memory SRB Scan R eversal Boa rd SYNC Synchronization TTL Transistor-Transistor L ogic .
Chapter 2---System Description Model 250 Service Manual 2-1 2.0 Sy stem De s c r i ption Contents 2.1 Introduction .................................................................................................. 2-1 2.2 Electrical Section...........
Chapter 2---System Description 2-2 Model 250 Service Manual Figure 2-1 Overview of the Model 250 projector showin g major components 2.2 Electrical Section The electri cal section consi sts of the Incoming Power C ircuit, and th e Power Supplies and the Ig niter Assembly.
Chapter 2---System Description Model 250 Service Manual 2-3 Igniter A ssembly The Igniter Assembly provides the high voltage pulse that lights the Arc Lamp and acts as a link from the Arc Lamp Power Supply to the Arc Lamp after the Arc Lamp has bee n lit.
Chapter 2---System Description 2-4 Model 250 Service Manual ! Condensing Lenses (2) - The Primar y Condensing L ens collects all the light from the Light Pipe and begins to bend the light rays into a straig ht path.
Chapter 2---System Description Model 250 Service Manual 2-5 Relay Lens A ssemblies (3) There are thr ee Rela y Lenses, one for each color. The Rel a y Lens focuses the image light from the CRT onto the photosensitive layer on the input side of the ILA ® .
Chapter 2---System Description 2-6 Model 250 Service Manual Printed Circuit Boards (PCB) The Model 250 Projector has eight main PCBs: ! System Controller PCB - System Controller PCB controls much of the electronics s ystem.
Chapter 2---System Description Model 250 Service Manual 2-7 provides an interconnection interfac e for all the electroni c components in the projector. CRT/Y oke Assemblies The CRT/Yoke Assemblies bridge between the Optical and the El ectronic sections.
Chapter 2---System Description 2-8 Model 250 Service Manual projector. These air-borne p articles can land on optics such as the ILA ® and cause large diffuse dark areas on the scr een.
Chapter 2---System Description Model 250 Service Manual 2-9.
Chapter 3---Electr ical Model 250 Service Manual 3-1 3.0 Electrical Contents 3.1 Safet y............................................................................................................ 3-1 3.2 Incoming Power Circuit .......................
Chapter 3---Electr ical 3-2 Model 250 Service Manual Left/ Right Orientati on: W hen ref er r ing t o th e l ef t or r ig h t i n t hi s c h apt e r , i t i s wi th reference to standing at the rear of the projector, f acing the screen. Connectors on subassemblies and PCBs hav e tabs that must be released first before pulling on the connector.
Chapter 3---Electr ical Model 250 Service Manual 3-3 3.3 Power Supplies All Series 200 projectors including the Model 250 have three power supplies. These include: ! Low Voltage Power Supply ! Arc Lam.
Chapter 3---Electr ical 3-4 Model 250 Service Manual Figure 3-1 Low Voltage Power Supply I/O Diagram. LVPS - Operation: AC power is delivered to the Low Voltage Power Supply from the AC line filter.
Chapter 3---Electr ical Model 250 Service Manual 3-5 ! +5.1V for digital components ! +6.2V for CRT filaments ! ±15V for analog circuits ! +80V supply used b y the High Voltage Power Suppl y, Video Amplifier PCB, and the Horizontal/Vertical Deflection PCB.
Chapter 3---Electr ical 3-6 Model 250 Service Manual ALPS - Inputs : AC input power: Directly from the AC Line Filter. The input ran ge is from 220- 240 VAC, at 50/60 Hz. /LAMP_ENA - from the S ystem Controller PCB. Turns on the ALPS. /COVER_ON - signal enabling the Arc Lamp Power Suppl y.
Chapter 3---Electr ical Model 250 Service Manual 3-7 Figure 3-2 Arc Lamp Power Supply signals and voltages. ALPS - Operation: Three signals (/LAMP_ENA, /COVER_ON, and /LAMP_OK) are required in order for the Arc Lamp Power Supply to light the Arc Lamp.
Chapter 3---Electr ical 3-8 Model 250 Service Manual The Arc Lamp Power Suppl y sends the /LAMP_LIT signal bac k to the System Controller when the Arc Lamp is lit.
Chapter 3---Electr ical Model 250 Service Manual 3-9 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord. 3. Remove the front cover ( see se ction 6.1 Projector Covers ). 4. Remove the lower-right-side pan el by removing the five Pozi-drive screws securing it.
Chapter 3---Electr ical 3-10 Model 250 Service Manual Figure 3-4 High Voltage Power Supply I/O signals. HVPS - Inputs HVPS_SYNC - this signal is g enerated on the Raster Timing Generator PCB. Square wave HCT level with 50 or 33% dut y cycle. The signal is synchronized to horizontal sync.
Chapter 3---Electr ical Model 250 Service Manual 3-11 RGB Anode Voltage - goes directl y to each CRT RGB Focus Vol tage - goes di rectl y to each CRT Arc Ground - The Arc Gr ound protection for each CRT from the Video Amplifier PCB. HVPS - Operation The High Voltage Power Supply has three basic functions.
Chapter 3---Electr ical 3-12 Model 250 Service Manual HVPS - Remove and Replace Tools Needed #1 Pozi-drive Phillips-head screwdriver #2 Pozi-drive Phillips-head screwdriver small Flat head screwdri ver Parts Needed High Voltage Power Supply p/n 102566 To remove the High Voltage Power Suppl y: 1.
Chapter 3---Electr ical Model 250 Service Manual 3-13 Table 3-1 HVPS - P45 I/O Pinout PIN # Description PIN # Description 1 GND (+ 80V) 9 +15V 2 GND (+ 15V) 10 -15V 3 GND (- 15V) 11 G1 SUPPLY 4 GND (G1) 12 /HV_ENA 5 /HV_OK 13 V PARABOLA 6 H PARABOLA 14 H DRIVE (HVPS_SYNC 7 GND (DAF) 8 +80V Figure 3-6 High Voltage Power Supply.
Chapter 3---Electr ical 3-14 Model 250 Service Manual 10. Disconnect P45 (“Control”) at upper l eft of HVPS. 11. Disconnect and label the three Fo cus cables. The square tabs on thes e cables ( see Figure 3-6 ) ma y have to be lifted up. Gentl y pry up with a small Flat head screwdri ver.
Chapter 3---Electr ical Model 250 Service Manual 3-15 3.4 Igniter A sse mbly The Igniter Assembly consists of the Igniter and the Laser Power Supply. The Igniter and Laser Power Supply are replaced as one unit.
Chapter 3---Electr ical 3-16 Model 250 Service Manual Figure 3-7 Ig niter Assembl y. Igniter Assembly - S ervice Adju stments There are no s ervice adjust ments performed on t he Igniter Assem bl y. Igniter Assembly - Remove and Replace Replace the Igniter and the Laser Po wer Suppl y as one unit.
Chapter 3---Electr ical Model 250 Service Manual 3-17 5. Disconnect the orange cable attached to the input side of the Igniter Transformer using the 7/16-inch wrench. This ca ble will have black shrink sleeving on it. It goes to the negative terminal of the Arc Lamp Power Supply.
Chapter 4---Optical Model 250 Service Manual 4-1 4.0 Optical Contents 4.1 Arc Lamp...................................................................................................... 4-2 4.2 Optical Path .............................................
Chapter 4---Optical 4-2 Model 250 Service Manual 4.1 Arc Lamp The Arc Lamp is the beg inning of the high intensity Light Path. It is loc ated inside a housing on the right side of the Optical Support Assembl y ( see Figure 4-5 ).
Chapter 4---Optical Model 250 Service Manual 4-3 CA U T IO N ! Fan di sconnection is acceptable for a shor t period of time only (pr eferably <20 minut es--max imum 45 minutes).
Chapter 4---Optical 4-4 Model 250 Service Manual Hot spot off-center Figure 4-1 Arc Lamp “Hot Spot” (bri ghtest area) i s off-ce nter verti call y and horizontally.
Chapter 4---Optical Model 250 Service Manual 4-5 Figure 4-3 Arc Lamp Assembl y access door. Arc Lamp - Remove and Replace The Arc Lamp Enclosure Assembl y consists of the Xenon Arc Lamp module and blower. Replace the blower together with the Arc Lamp Module.
Chapter 4---Optical 4-6 Model 250 Service Manual 5. Disconnect the orange Cathode cable from the Igniter, using the 7/16-inch wrench ( see Figure 3-7 ). 6. Cut the cable tie that is wrapped around the fer rite inductor (metal tube with white cap below the blower).
Chapter 4---Optical Model 250 Service Manual 4-7 Figure 4-4 Arc Lamp Assembly top view. 4.2 Optical Path Optical Path - Main Function ! Transports the Arc Lamp high inte nsity light from the Arc Lamp .
Chapter 4---Optical 4-8 Model 250 Service Manual Figure 4-5 Upper level view of Optical Path (top view). Optical P ath - Inputs Arc Lamp high intensity white light Component RGB Image light from each .
Chapter 4---Optical Model 250 Service Manual 4-9 The Dichroic Beamsplitter Asse mbly separates the white light into its re d, green, and blue components.
Chapter 4---Optical 4-10 Model 250 Service Manual Figure 4-6 Optical Path.
Chapter 4---Optical Model 250 Service Manual 4-11 Figure 4-7 Optical Path Optical Path - Servi ce Adjustmen ts Tools Needed 3-mm Hex wrench Parts Needed No serviceable parts The one adjustment that can be performed on th e optical path is with the XY Positioner that moves the #1 Condensing Lens in the X- and Y-axis.
Chapter 4---Optical 4-12 Model 250 Service Manual Positioner adjusts the light beam coming out of the Light Pipe so that it projects squarel y onto the face of the ILA ® . NOTE: Do not adjust the XY Positioner unless there is a dark edge visible on screen.
Chapter 4---Optical Model 250 Service Manual 4-13 4.3 ILA ® ILA ® Main functions ! Modulates image light from the CRT onto the high intensity polarized light from the Arc Lamp ! Reflects hig h inten.
Chapter 4---Optical 4-14 Model 250 Service Manual ILA ® Operation The ILA ® plays a critical part in bringing the image to the screen. The ILA ® receives the i mage light when th e CRT proje cts the image throu gh the Rela y Lens and focuses it onto the photoconductive la yer on the input side of the ILA ® .
Chapter 4---Optical Model 250 Service Manual 4-15 NOTE: Reset the IL A ® bias after setting the Compe nsator and check G 2 Sensitivity Offset, and Threshold Offset level ( see Model 250 User’s Guide, section 5.8 Black Level G 2 and Sensitivity Offset ).
Chapter 4---Optical 4-16 Model 250 Service Manual CA U T IO N! To av oid damagi ng the con nector, grasp the I LA ® assembly itself, not the connector at the top . Figure 4-10 ILA ® Assembl y top view. The overlap screws shown are under the ILA ® .
Chapter 4---Optical Model 250 Service Manual 4-17 19. Retighten the two wing nuts and tighten the two hex nuts. 20. Reset the ILA ® biases to their previous levels from Step 2.
Chapter 4---Optical 4-18 Model 250 Service Manual W A RNIN G !!! Always wear an ANSI/AS TM 10,000 volt rated safety glov e when wor king around CR Ts due to th e High Voltage pr esent th ere.
Chapter 4---Optical Model 250 Service Manual 4-19 8. Loosen the two hex bolts ( see Figure 4-10 ) on the ILA ® assembly in front of the Relay Lens. 9. Slide the Relay ILA ® /Lens/CRT assembly forward or back ward to achiev e the sharpest spacer b all focus.
Chapter 4---Optical 4-20 Model 250 Service Manual 4.4 Relay Lenses The Rela y Lens focuses the image light r eceived from th e CRT on the photoconductive layer of the ILA ® ( see Figure 4-9 ). Ther e are no service adjustments for the Relay Lens. The Rela y Le ns rar el y needs service and is not considered a servic eable part .
Chapter 4---Optical Model 250 Service Manual 4-21 3. Loosen (do not remove) the Lens holding screw at the ri ght side ( see Figure 4-11 ) of the Projection Lens. Figure 4-11 Projection L ens holding screw and removal notch. NOTE: The 0.96:1 Projection Lens has an adapter sleeve installed on it.
Chapter 5 Optical 3-4-22 Model 100 Service Manual.
Chapter 5---Electronics Model 250 Service Manual 5-1 5.0 Electronics Contents 5.1 Safet y............................................................................................................ 5-1 5.2 Introduction ................................
Chapter 5---Electronics 5-2 Model 250 Service Manual W A RNING !! ! Nev er look directly at the Arc La mp, the lighted Projectio n Lens or into th e lamp housi ng, fr om any dista nce, when the projector is on. Di rect ex posure to lig ht of this brightness can cause severe ey e injury .
Chapter 5---Electronics Model 250 Service Manual 5-3 Figure 5-2 Model 250 Electronics Module with PCBs (side view). CA UT IO N ! It is ver y stro ngl y reco mm en ded tha t set up data be dow nloaded ( Expor ted, see s ection 8.2 Im porting/Exportin g ) before performi ng any o f the follow ing pr ocedures.
Chapter 5---Electronics 5-4 Model 250 Service Manual ! I/O control for VIC selection ! Two RS-232 serial interface ports ! Infrared ( IR) remote control interface. Acc epts input from front or rear IR detectors. ! External 3 color system sta tus LEDs.
Chapter 5---Electronics Model 250 Service Manual 5-5 Figure 5-4 System Controller PCB I /O Di agram for Power Supplies and peripher als..
Chapter 5---Electronics 5-6 Model 250 Service Manual Figure 5-5 System Controller PCB I/O Dia gram for other PCBs. System Controller PCB - Inputs /LV_OK - signal from the Low Voltage Power Suppl y; it tells the Sy stem Controller PCB that all the non-standby supply voltages are working.
Chapter 5---Electronics Model 250 Service Manual 5-7 280_CLK - Square wave signal from the Raster Timing Generator PCB, with 50% duty cycle, s y nchronized to the horizontal s ync at 280 times the frequency of the horizontal sync. This signal is used by the System Controller PCB to properly output shading and convergence data.
Chapter 5---Electronics 5-8 Model 250 Service Manual RGB_THRES - red, green, or blue Threshold corr ection information to the Video Processor PCB. RGB_SENS - red, green, or blue Sensitivity correction information to the Video Processor PCB.
Chapter 5---Electronics Model 250 Service Manual 5-9 Figure 5-6 Power On timing seque nce. Normal Operation Functions During normal projector operation, the S ystem Controller PCB receives commands through the remote control, tethered remote control, or a PC.
Chapter 5---Electronics 5-10 Model 250 Service Manual Controller PCB also enables the selected VICs through the IIC bus based on the VIC selected on the Channel Menu. The System Controller PCB generates the on-screen menus and test pattern overlays and sends them to the Video Processor PCB.
Chapter 5---Electronics Model 250 Service Manual 5-11 5.4 Video Processor PCB Video Processor PCB - Main Fun ctions ! Video signal input and multiplexing ! Sync signal stripping ! Overlay signal multi.
Chapter 5---Electronics 5-12 Model 250 Service Manual Figure 5-7 Video Processor PCB I/O diagram for VICs and Power Supplies..
Chapter 5---Electronics Model 250 Service Manual 5-13 Figure 5-8 Video Processor PCB I/O diagram for PCBs. Video P rocessor PCB - Output s RGB_VID - red, green, or blue video si gnal to Video Amplifier PCB, typicall y 0- 1 V. H&V_SYNC - horizontal sync pulse goes to the Ra ster Timing Generator PCB.
Chapter 5---Electronics 5-14 Model 250 Service Manual RGB_G 2 - red, green, or blue G 2 voltage adjust control signal to the Video Amplifier PCB. G 1 _BIAS - G 1 a djust control voltage (g lobal adjustment) to the Video Amplifier PCB. IIC_INT - IIC interrupt output to System Controller PCB.
Chapter 5---Electronics Model 250 Service Manual 5-15 The G 2 voltage accelerate s the electrons that are emitted from the c athode of the CRT. The CRT filament emits the electrons and G 1 voltage regulates the amount of electrons that are emitted from the cathode.
Chapter 5---Electronics 5-16 Model 250 Service Manual 6. Pull the black card extractor h andles back to disconnect the Video Processor PCB connector and pull the PCB out of the Electronics Module. 7. Reverse the p rocedure to in stall the Vi deo Processor P CB.
Chapter 5---Electronics Model 250 Service Manual 5-17 Figure 5-11 Raster Timing Generator for other PCBs. Raster Timing Gener ator PCB - Inputs V_SYNC - input vertical s ync from the Video Processor PCB. H_SYNC - input horizontal sync from the Video Processor PCB.
Chapter 5---Electronics 5-18 Model 250 Service Manual IIC_CLK - IIC clock line. Unidirectional clock line for control of s ynchronous data transfer over the IIC bus. IIC_DATA - IIC data line. Bi-dir ectional serial line for s ynchronous data transfer between System Controlle r PCB and Raster Timing Generator PCB.
Chapter 5---Electronics Model 250 Service Manual 5-19 V_DRIVE - square wave negative going pulse to the Convergence Defle ction PCB, synchronized to the selected vertical s ync with the pulse width of about four horizontal periods.
Chapter 5---Electronics 5-20 Model 250 Service Manual Vertical Deflection PCB to break the range of horiz ontal scan frequencies into four smaller ranges called bands ( see Figure 5-12 ).
Chapter 5---Electronics Model 250 Service Manual 5-21 5.6 Horizontal Ve rtical Deflection PCB Horizontal Verti cal Def lection PCB - Main Fun ctions ! Drive the main horizontal deflection coils to pro.
Chapter 5---Electronics 5-22 Model 250 Service Manual IIC_CLK - IIC clock line IIC_DATA - IIC data line IIC_SINT - IIC interrupt ±15 V - input power from the Low Voltage Power Supply, for the analog circuitry. +5.1 V - input power from the Low Volta ge Power Supply, for the digital circuitry.
Chapter 5---Electronics Model 250 Service Manual 5-23 Figure 5-14 Horizontal/Verti cal I/O Dia gram for Scan R eversal and Vi deo Amplifier PCBs..
Chapter 5---Electronics 5-24 Model 250 Service Manual Figure 5-15 Phy si cal layout of the Horiz ontal/Vert ical PC B (note the Vertical Siz e Adjustment Pots (Red-137, Grn-148, and Blu-160) on the lower ri ght).
Chapter 5---Electronics Model 250 Service Manual 5-25 Horizontal Verti cal Def lection PCB - Operation The Horizontal Vertical Deflection PCB consists of a RGB horizontal deflection amplifier and separate vertical deflection amplifiers.
Chapter 5---Electronics 5-26 Model 250 Service Manual the V_PARAB waveform. The output waveform V_RG B+ goes to the Scan Reversal PCB and then drives the Vertical Deflection Yokes. The V ertical Deflection Yoke return signal to the Horiz ontal Vertical Deflection PCB is V_RGB-.
Chapter 5---Electronics Model 250 Service Manual 5-27 Figure 5-17 Red image needs verti cal adjustm ent (increas e). If Red is higher than Green at the top and bottom, or lower than Green at the top and bottom, the Red image may not being centered corr ectl y.
Chapter 5---Electronics 5-28 Model 250 Service Manual Horizontal Vertical Deflection PCB - Remove and Replace The Horizontal/Vertical (H/V) De flection PCB is located in the upper portion of the Electronic Module card ca ge.
Chapter 5---Electronics Model 250 Service Manual 5-29 ! Convergence output amplifiers for all colors and both horizontal and vertical ax es ! Convergence enable and raster fill function ! ILA ® assem.
Chapter 5---Electronics 5-30 Model 250 Service Manual Figure 5-19 Convergence Deflection PCB I/O Diagram..
Chapter 5---Electronics Model 250 Service Manual 5-31 Figure 5-20 Convergence Deflection PCB I/O Diagram..
Chapter 5---Electronics 5-32 Model 250 Service Manual Figure 5-21 Phy si cal layout of the Convergence/Deflection PCB. Convergence Deflecti on PCB - O peration The Convergence Deflection PCB performs fou r main functions. It generates the vertical deflection sawtooth waveform.
Chapter 5---Electronics Model 250 Service Manual 5-33 temperatur e of the green I LA ® increases, the bia s is increased to mainta in a constant ILA ® output. The Convergence Defle ction PCB receives commands for x and y-axis convergence from the S ystem Controller PCB.
Chapter 5---Electronics 5-34 Model 250 Service Manual 8. Reinstall the Convergence/Deflection PCB by lowering the right side in first until it clears the electronic module ed ge, then lowering the left side in.
Chapter 5---Electronics Model 250 Service Manual 5-35 Y_RGB_YOKE (neg.) - bottom of red, green, and blue y-axis convergence yokes. RGB_LOCK (neg.) - interlock for red, green, and blue deflection yokes (5 V when closed or 0 V when op en). Scan Reversal PCB - Outputs H_LOCK (neg.
Chapter 5---Electronics 5-36 Model 250 Service Manual Figure 5-22 Scan Reversal PCB I/O Diagram ..
Chapter 5---Electronics Model 250 Service Manual 5-37 Figure 5-23 Scan Reversal PCB I/O Dia gram for Horizontal Vertical Deflection PCB ..
Chapter 5---Electronics 5-38 Model 250 Service Manual Figure 5-24 Scan Reversal PCB I/O Dia gram for CRT Yokes. Scan Reversal PCB - Operation The Scan Reversal PCB has several functions. It provides an interface for scan reversal, and provides for horizontal width adjustment.
Chapter 5---Electronics Model 250 Service Manual 5-39 front/upright projection. This means the horizontal scan jumper is plugged into J100, the vertical scan jumper is plugged into J 53, and the convergence jumper is plugged into J50.
Chapter 5---Electronics 5-40 Model 250 Service Manual Scan Reversal PCB - Service Ad justmen ts Figure 5-25 Phy s ical layout of the Scan Revers al PCB. Horizontal Size adjustment The Horizontal size adjustment must be performed after the Ho rizontal Vertical Deflection PC B is repl aced.
Chapter 5---Electronics Model 250 Service Manual 5-41 10. Recheck all Geometr y and Convergence settings and readjust wherever necessar y. 11. Replace the rear cover.
Chapter 5---Electronics 5-42 Model 250 Service Manual Table 5-1 Projection orie ntation jumper setting s. Orientatio n Conver gence. P50 goes to: Vertical.
Chapter 5---Electronics Model 250 Service Manual 5-43 7. Power ON the projector and allow it to stabilize for a minimum of 15 minutes. It is recommended that the projector be op erating for a least one hour before performing shading adjustments.
Chapter 5---Electronics 5-44 Model 250 Service Manual Video Am plifier P CB - Inputs RGB_VIDEO - image pre-amp signals from the Video Pro cessor PCB (about 0.5 Vpp). RESTORE - image DC restorations pulse from Video Processor PCB, logic level positive going 4% dut y c ycle.
Chapter 5---Electronics Model 250 Service Manual 5-45 Figure 5-26 Video Amplifier PCB I/O Diagram.
Chapter 5---Electronics 5-46 Model 250 Service Manual Figure 5-27 Video Amplifier PCB I /O Diagram for th e Video Processor PCB and CRTs. Video Amplifier PCB - Outputs RGB_BEAM - Cathode beam current sens e lines (about 1 V per 100 µ A). RGB_CATHODE - image output signal to CRTs (about 40 Vpp with peak voltage of 70 V).
Chapter 5---Electronics Model 250 Service Manual 5-47 RGB_HEAT (neg.) - negative side of CRT heater volta ge (ground level). ARC_GND - CRT ground back to High Voltage Power Suppl y (CRT Protection against arcin g). /VA_OK - CRT Protection signal to the High Voltage Power Supply (low = good, high = bad).
Chapter 5---Electronics 5-48 Model 250 Service Manual The Video Amplifier PCB detects all the necessar y supply voltages (+80 V, +15 V, and the +6.2 V) for the CRT and includes that as part of the /VA_O K signal. If any of the supply voltages is not present, /VA_OK goes high, again shutting down the G1 and G2 regulators.
Chapter 5---Electronics Model 250 Service Manual 5-49 5. Remove the green CRT by loosening the green CRT Holder Ring ( see Figure 5-29 ). Perform this step with the CRT Socke t Connector still connected to the Green CRT and the ground wire still connected from the CRT/Yoke Assembly to the CRT Socket Connector.
Chapter 5---Electronics 5-50 Model 250 Service Manual 12. Disconnect the thr ee Focus c ables that run f rom the CRT S ocket Connectors to the Focus connectors on the HVPS.
Chapter 5---Electronics Model 250 Service Manual 5-51 5.10 CRT/Yoke A ssemblies CRT/Yoke Assemblie s - Main Function ! CRTs converts image signal to image light ! Yokes provide horizontal and vertical defl ection for CRTs ! Yokes provide x-axis and y-axis convergence correction for CRTs CRT/Yoke A ssemblies - Input s To Yokes H_RGB_YOKE (pos.
Chapter 5---Electronics 5-52 Model 250 Service Manual Image - image lig ht that passes throu gh Relay Lens and focuses on photosensitive layer on input side of ILA ® . CRT/Yoke Assemblies - Ope ration The CRTs receiv e image signals t hat come from t he VICs to the Vi deo Processor PCB, to the Video Amplifier PCB.
Chapter 5---Electronics Model 250 Service Manual 5-53 CRT Mechanical Focus The CRT Mechanica l focus is factory-set and normally will not require additional adjustment unless a CRT has been replaced. After repla cing a CRT, reset the mechanical focus.
Chapter 5---Electronics 5-54 Model 250 Service Manual Figure 5-29 CRT Mechanical Focus adj ustments. CRT Rotation The CRT tilt adjustment a ligns the CRT level with the screen. This is a fac tor y-set adjustment and should not need adjusting unless the CRT or yoke is moved.
Chapter 5---Electronics Model 250 Service Manual 5-55 5. View the color for the CRT that requires rotation. Hide the othe r two colors. 6. In the Geometry menu, set “Reg Enable” to of f b y unchecking the box.
Chapter 5---Electronics 5-56 Model 250 Service Manual CRT Electroni c Focus The Electronic Focus is fac tor y-set a nd normall y will not ne ed to be adjusted except after component replacement, maintenance, o r if wide temperature variations exist between the factor y and the field location.
Chapter 5---Electronics Model 250 Service Manual 5-57 CRT/Yoke Assemblies - Remove and Replace Three CRT/Yoke Assemblies ar e located in the CRT Assembly a rea below the card cage ( see Figure 5-30 ). W A RNIN G !!! Handle the C RT/Yoke Asse mblies w ith extreme ca ution.
Chapter 5---Electronics 5-58 Model 250 Service Manual NOTE: For the Green CRT/Yoke Assembly only, it is best to perform Step 10 with the CRT socket connector still connected to the Green CRT and the ground wire still connected from the CRT to the socket connector.
Chapter 5---Electronics Model 250 Service Manual 5-59 ! YPbPr (Optional) ! Quad Standard Decoder (Optional) ! Quad Standard Decoder/Line Double r (Optional) The are three V ICs slots on the Model 250, however the 4-I np ut RGBHV, and the Quad Standard Decoder/Line Doubler requir e two slots.
Chapter 5---Electronics 5-60 Model 250 Service Manual RGBHV VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.7-1.0 Vpp). H - horizontal sync from source input V - vertical sync from source input +15 V - (not used) -15 V - (not used) +5.
Chapter 5---Electronics Model 250 Service Manual 5-61 Parts Needed RGBHV VIC p/n 102597 To remove the RGBHV VIC: 1. Power off the projector by IR Remote or PC, and allow the coolin g fans to run until they shut off. 2. Turn the AC Circuit Breaker to the OFF position and unplug the AC Power Cord.
Chapter 5---Electronics 5-62 Model 250 Service Manual Figure 5-34 Graphics Enhancer Plus faceplate. Graphics Enhancer P lus VIC - Inputs R - red image from source input (0.7-1.0 Vpp). G - green image from source input (0.7-1.0 Vpp). B - blue image from source input (0.
Chapter 5---Electronics Model 250 Service Manual 5-63 Graphics E nhan cer Plus VIC - Ope ration The RGBHV VIC receives the sepa rate red, green, blue image inputs and horizontal, and vertical sync inputs from the source input device.
Chapter 5---Electronics 5-64 Model 250 Service Manual 4-Input (Quad) RGBHV VIC 4-Input (Quad) RGBHV VIC - Main Func tions ! Interface for four s ets of Red, Green, and Blue image inputs ! Interface fo.
Chapter 5---Electronics Model 250 Service Manual 5-65 IIC CLK - IIC clo ck line IIC DATA - IIC data line IIC SINT - IIC interrupt line Figure 5-36 4-I nput (Quad) RGBH V VIC.
Chapter 5---Electronics 5-66 Model 250 Service Manual 4-Input (Quad) RGBHV VIC - Outputs RED_VIC - red image to the Video Processor PCB (0.7-1.0 Vpp). GRN_VIC - green image to the Video Processor PCB (0.7-1.0 Vpp). BLU_VIC - blue image to the Video Processor PCB (0.
Chapter 5---Electronics Model 250 Service Manual 5-67 YPbPr VIC This decoder video input card (YPbPr_VIC) contains three BNC input connectors that can be used for two differ ent inputs, YPbPr or GBR. The YPbPr PCB converts these component signals to RGB t ype image signals.
Chapter 5---Electronics 5-68 Model 250 Service Manual Figure 5-38 YPbPr VIC faceplat e. YPbP r VIC - Inputs YPbPr I nputs Y - green image input with composite horizontal and vertical sync (0.7-1 Vpp ) Pb - blue image input for YPbPr (0.7-1 Vpp) Pr - red image input for YPbPr (0.
Chapter 5---Electronics Model 250 Service Manual 5-69 interface. An operator selects the V IC and input in the Channels Menu (see section 4-6 in the User’s Guide) .
Chapter 5---Electronics 5-70 Model 250 Service Manual Quad Standard Decoder VIC The Quad Standard Decoder VIC provides an interface fo r composite and S-Video formats input. It contains three BNC input connectors, one for Composite Video and two for S-Video (luminance and chrominanc e).
Chapter 5---Electronics Model 250 Service Manual 5-71 Quad Standard D ecoder VIC - Inputs Comp - input for Composite image sig nal includes s ync pulses (.07-1 Vpp) Yin - input for Luminance or brightness information of S-image (0.7-1 Vpp ) Cin - input for Chrominance or color information of S-image (0.
Chapter 5---Electronics 5-72 Model 250 Service Manual when the S-image input is selected. Only one LED will be illuminated at one time. Neither LEDs will be illuminated when the Quad Standard Decoder VIC is not selected as the input to projector.
Chapter 5---Electronics Model 250 Service Manual 5-73 installed in the #2 or 3 VI C slot (it will not fit into the #1 slot), a blank face plate must be installed above it. The blank faceplate is not included with the Quad Standard Decoder/Line Doubl er VIC unless it is installed at the factor y.
Chapter 5---Electronics 5-74 Model 250 Service Manual 5.12 Backplane PCB The Backplane PCB is the spine of the Electronics Module. Ever y major electronic component in the Model 250 projector connects to and throu gh the Backplane PCB. It is hidden in the inside of the Electronics Module ( see Figure 5-2 ).
Chapter 5---Electronics Model 250 Service Manual 5-75 Figure 5-43 Backplane Diagram (middle section). The following is a list of pins that would be helpful for troubleshooting purposes.
Chapter 5---Electronics 5-76 Model 250 Service Manual Figure 5-44 Backplane Diagram (right side)..
Chapter 5---Electronics Model 250 Service Manual 5-77.
Chapter 6---Miscellaneous Items Model 250 Service Manual 6-1 6.0 Miscellaneous Items Contents 6.1 Projector Covers ........................................................................................... 6-1 6.2 Electronics Module Tilt-up .........
Chapter 6---Miscellaneous Items 6-2 Model 250 Service Manual 5. When the Latch Levers are inserted into the holding slots, lift the cover off. Be careful not to brush against an y of the internal components of the projector when removin g the cover. If an y undue resistance is felt, stop to locate the source before p roceeding.
Chapter 6---Miscellaneous Items Model 250 Service Manual 6-3 Figure 6-1 Electronics Module hinge and locking mechanism. 6.3 Ventilation Adequate cooling is a major consideration for the Model 250 p rojector. There are thirteen cooling fans (including the Arc Lamp blower) in this projector.
Chapter 6---Miscellaneous Items 6-4 Model 250 Service Manual 6.4 A ir Filters There are three pol yurethane air filters in the Model 250. Air filters should be cleaned whenever nece ssar y. I n extremel y dusty or dirty conditions, the filte rs should be cleaned more frequentl y.
Chapter 6---Miscellaneous Items Model 250 Service Manual 6-5 The EMI Shield is a me tal plate located in front of the Low Voltage Power Supply and the Arc Lamp Power Supply.
Chapter 6---Miscellaneous Items 6-6 Model 250 Service Manual.
Chapter 7---Troubleshooting Model 250 Service Manual 7-1 7.0 T roubleshooting Contents 7.1 Safet y............................................................................................................ 7-1 7.2 LEDs................................
Chapter 7---Troubleshooting 7-2 Model 250 Service Manual Left/ Right Orientati on: W hen refe rring to the le ft or righ t in th is chap ter, it is with r eference to sta nding at th e rear o f the proj ector, facing the screen . Connectors on subassemblies and PCBs hav e tabs that must be released first before pulling on the connector.
Chapter 7---Troubleshooting Model 250 Service Manual 7-3 Figure 7-1 Rear Panel layout Control Out - The Control Out terminal is another RS232 port similar to the Terminal In port except that it can not be used to Import/Export setup data. Tethered Remote Jack - T he Model 250 projector is shipped with an IR Remote Control.
Chapter 7---Troubleshooting 7-4 Model 250 Service Manual Figure 7-2 Dip Switch Block on System Controller PCB. Reset Switch - The Reset Switch resets the CPU if the projector locks up and does not respond to an IR Remote, PC or Laptop computer.
Chapter 7---Troubleshooting Model 250 Service Manual 7-5 Video Processor PCB LEDs Figure 7-4 Video Processor Test Points and LEDs . Video Processor - Test Points The test points on the Video Processor PCB are visible and accessible from the left side of the Electronics Module when the re ar projector cover is removed.
Chapter 7---Troubleshooting 7-6 Model 250 Service Manual Sync - There ar e three s ync test points: H sync for the horizontal s ync pulse, V sync for the vertical s ync pulse, and G s ync, which is a combination of the horizontal and vertical s ync pulses that are carried with the green image signal.
Chapter 7---Troubleshooting Model 250 Service Manual 7-7 Raster Timing Gener ator PCB LEDs Figure 7-6 Raster Timing Generator LEDs..
Chapter 7---Troubleshooting 7-8 Model 250 Service Manual Raster Timing Generato r PCB LEDs Band LEDs The range horizontal scan fr equencies accepted b y the Model 250 projector is divided into four “bands”.
Chapter 7---Troubleshooting Model 250 Service Manual 7-9 Convergence Deflection PCB LED Figure 7-7 Convergence Deflection PCB LED. The Convergence Deflection PCB has only one LED.
Chapter 7---Troubleshooting 7-10 Model 250 Service Manual Video A mpli fi er PCB LED Figure 7-8 Video Amplifier PCB LED. The VA_OK LED on the Video Amplifier PCB is illuminated g reen when all the CRT deflection circuits are operating properl y (/DEFL_OK), the suppl y voltage s (±15 V, +6.
Chapter 7---Troubleshooting Model 250 Service Manual 7-11 Backplane PCB LEDs Figure 7-9 Backplane PCB LEDs on right side (exposed side)of PCB . The Backplane has t wo status LEDs, the / LV_OK signal from t he Low Volt age Power Supply, and the /HV_OK signal from the Hi gh Voltage Power Supply .
Chapter 7---Troubleshooting 7-12 Model 250 Service Manual 7.3 Diagrams Command ON Timing Figure 7-10 POWER ON and POWER OF F command timing diagram. When the AC Circuit Breaker is powered O N, the Low Voltage Power Suppl y generates a +5.1 V Standb y voltage that goes to the System Controller PCB to power the CPU and IR Detectors.
Chapter 7---Troubleshooting Model 250 Service Manual 7-13 to the Arc Lamp Power Supply low. The Arc Lamp Power Supply delivers 170 V to the Igniter, which generates a 32 kV pulse to the Arc Lamp and the Arc Lamp lights.
Chapter 7---Troubleshooting 7-14 Model 250 Service Manual Image Path Figure 7-11 RGB I mage path f rom VIC to CRT. The image signals can be in the form o f separate red, green and blue component signa.
Chapter 7---Troubleshooting Model 250 Service Manual 7-15 Deflection Path Figure 7-12 CRT Deflec tion path from Raster Timing Generator PCB . The Raster Timing Generator PCB receives the horizontal and vertical sync pulses from the Video Processor PCB, and uses a Phase Locked Loop circuit to lock to the horizontal sync.
Chapter 7---Troubleshooting 7-16 Model 250 Service Manual The Horizontal Vertical Deflection PCB outputs H_OUT_FLYBACK to the Scan Reversal PCB. This is the horizontal deflection waveform that drives the horizontal CRT deflection yokes. The H_RED+, GRN+, and BLU+ are the horizontal deflection returns.
Chapter 7---Troubleshooting Model 250 Service Manual 7-17 Figure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB, Convergence Deflection PCB and Scan R eversal PCB.
Chapter 7---Troubleshooting 7-18 Model 250 Service Manual Figure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT..
Chapter 7---Troubleshooting Model 250 Service Manual 7-19 CRT Protection Figure 7-15 CRT Protection path The CRT Protection circuit is designed to protect the CRTs in case an y of the CRTs is not recei ving a horiz ontal or vertical de flection wav eform.
Chapter 7---Troubleshooting 7-20 Model 250 Service Manual Amplifier PCB the /SWEEP_OK be comes the /VA_OK signal and checks the supply voltages such as +15 V, +6.2 V and +80 V. The /V A_OK LED illuminates ( see Video Amplifier PCB LED ) if the supply voltages are present and the /SWEEP_OK is low.
Chapter 7---Troubleshooting Model 250 Service Manual 7-21 Figure 7-16 CRT Protection path between the Scan Reversal PCB and CRT..
Chapter 7---Troubleshooting 7-22 Model 250 Service Manual 7.4 Error Codes For certain errors that may occur in the Mod el 250 Projector the softwar e provides error cod es that are helpful in determining the nature of the problem. These error codes c an be seen on the left side of the monitor screen when usin g a PC connected to Port A or Port B.
Chapter 7---Troubleshooting Model 250 Service Manual 7-23 1.34 “No mem availabl e” Software error -no heap avail able for memor y allocation. 2.1 “ Invalid Sector” Software error -invalid Flash sector number. 2.2 “Write Timeout” Flash Memory Write Failure.
Chapter 7---Troubleshooting 7-24 Model 250 Service Manual 4.17 “VIC1 Board Not OK” /VI C_OK is High (BAD) on VIC Slot 1. 4.18 “VIC 2 Board Not Ok” /VIC_OK is High (BAD) on VIC Slot 2 4.19 “VIC3 Board Not OK” /VI C_OK is High (BAD) on VIC Slot 3 4.
Chapter 7---Troubleshooting Model 250 Service Manual 7-25 7.5 Troubleshoo ting Guid e Table 7-3 lists some common projector problems, what to check when p roblems occur, and offers possible solutions. It indicates the section in this Service Manual that provides some related information on the problem.
Chapter 7---Troubleshooting 7-26 Model 250 Service Manual Troubleshooti ng on the Backpl ane PCB The connectors on the Backpl ane PCB provide on e of the more a ccessible places to probe voltages and signals that may be useful for troubleshooting purposes ( see Figure 7-18 and associated list of signals and voltages ).
Chapter 7---Troubleshooting Model 250 Service Manual 7-27 Figure 7-18 Backplane Diagram (m iddle secti on) The following is a list of pins that would be helpful for troubleshooting purposes.
Chapter 7---Troubleshooting 7-28 Model 250 Service Manual Figure 7-19 Backplane Diagram (ri ght side).
Chapter 7---Troubleshooting Model 250 Service Manual 7-29.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-1 8.0 Software and Protocol Contents 8.1 Software Updating........................................................................................ 8-1 8.2 Importing/Exporting ..............
Chapter 8---Softwar e and Protocol 8-2 Model 250 Service Manual ! Cursor=Block & Blink ! Terminal Font=Fixedsys 15 ! Translation=None, ! Show Scroll Bars=On ! Buffer Lines=100 ! Use Function Arrow ! Control Keys for Windows=Off Select OK. 6. Under Settings selec t Text Transfer=Standard Flow Control.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-3 ***WARNING: IMPROPER USE MAY MAKE THIS SYSTEM UNBOOTABLE*** (This warning relates to the Flash Memory updating that occurs in Step 11D. Do not turn projector power off while the Flash Memory is updating) Memory buffer reset to 0xff Begin your S-Record upload now (Esc to abort).
Chapter 8---Softwar e and Protocol 8-4 Model 250 Service Manual Boot Manager Ver y.y.0 (Service Mode Startup) Copyright (c) 1994-1996 Hughes-JVC Technology Command: _ 12A. To update the S ystem Software from the Boot Manager prompt: 12B. Type in the command “loads ys” at the prompt.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-5 The software update is complete. To restart the proje ctor, t y pe in the “sys” or “reboot” command and press Enter. Th e projector will now restart with the updated System Software.
Chapter 8---Softwar e and Protocol 8-6 Model 250 Service Manual Exporting 1. Make sure the Windows TERM INAL program is configured for SOFTWARE FLOW CONTROL (XON/XOFF). A corrupt Export file will result if SW flow control is not used. 2. Choose the directory and filename for savin g the Export Data.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-7 . END A similar message is display ed on the projector screen : ================================= | Export Configuration | | EXPORT COMPLETE | | -> STOP Host Download | | -> THEN Press ESC | ================================= 10.
Chapter 8---Softwar e and Protocol 8-8 Model 250 Service Manual | Import Configuration | | Start SEND TEXT Upload from | | Host on Serial PORT A | | -To Abort: | | ->Stop Host Upload, | | ->THEN Press ESC to Abort | ================================= 6.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-9 FINALLY, press ESC to exit the projector Import operation and return to the Maintenance Menu.
Chapter 8---Softwar e and Protocol 8-10 Model 250 Service Manual 8.3 Termi nal s and Communicati on Pr otocols Terminals The projector can be controlled b y a VT-100 terminal. If a VT-100 is not available, a PC with Windows 3.1 or ProComm for DOS can emulate a VT-100.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-11 Communications Protocol Select SETTINGS using the menu bar, then select COMMUNI CAT IONS.
Chapter 8---Softwar e and Protocol 8-12 Model 250 Service Manual Center, H & V (RGB) P POS 80 50 Change channel Number + Enter Channel # + Enter Channel # + Enter 48-57 30-39 + 0D Color Y COL OR C.
Chapter 8---Softwar e and Protocol Model 250 Service Manual 8-13 *The Arrow ke ys are a sequence of Decimal or H ex numbers representing the sequence of Escape, Left Bracket, and A, B, C, or D dep ending on which arrow Is pressed.
Chapter 8---Softwar e and Protocol 8-14 Model 250 Service Manual.
Chapter 9---Parts List Model 250 Service Manual 9-1 9.0 Parts List Contents 9.1 Replacement Parts List ................................................................................. 9-1 9.2 Spares ...................................................
Chapter 9---Parts List 9-2 Model 250 Service Manual Description Part no. Power Cord, USA/Japan 104499 Power Cord, Europe 103939 Power Supply, Arc Lamp 105216 Power Supply, High Voltage 102566 Power Supply, L ow Voltage 102520 Prism Tank Assembly 103942 Projection Lens, 0.
Chapter 9---Parts List Model 250 Service Manual 9-3 9.2 Spares It may be advisable to maintain a supply of spares for the p rojector to minimize downtime. This is particular ly important when projectors are being operate d on a continuous basis or when multiple projectors are needed.
Chapter 9---Parts List 9-4 Model 250 Service Manual.
Glossary Model 250 Service Manual A-1 Glossary of T erms Amor phous Without definite form; not crystallized. Arc Lamp The high intensity light source in the Model 250 projector. The Xenon Arc Lamp operates at high temperatures (160° to 200°) and produces dangerousl y intensive lig ht with hazardous levels of ultraviolet and infrar ed radiation.
Glossary A-2 Model 250 Service Manual Fiel d One half of a complete vid eo frame. Odd lines in one field and even lines in another m ake up one frame. Fra me One complete TV pi cture or scre en of information. It is composed of two fields and has a total of 525 scanning lines in NTSC transmission.
Glossary Model 250 Service Manual A-3 Lume n A unit of measure of the flow, or rate of emission, of light measured with a Light Meter. An ordinary wax candle gener ates 13 lumens while a 100-watt bulb generates 1,200 lumens. Luminanc e Abbreviated as "Y.
Glossary A-4 Model 250 Service Manual S-Vide o An image signal that has the lumina nce (Y) information separate d from chrominance (C) information. Saturated Color 1) A color as far from white, black o r gra y as it can be (i.e., vermilion rather than pink).
Glossary Model 250 Service Manual A-5 alternating white and black horizontal lines that can be counted from the top of the picture to the bottom. Vert ical Scan Freque ncy The number of times per second a display image is written or refreshed. Vertical Scan Reverses the image verticall y for use with Reversal Jumper mirror-bounced displays.
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 250 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 250 - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso JVC 250 imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul JVC 250 ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il JVC 250, 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 250.
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 250. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo JVC 250 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.
