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JVC 250 service manual Video Amplifier PCB - Inputs

Models: 250

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Video Amplifier PCB - Inputs

Chapter 5---Electronics

Video Amplifier PCB - Inputs

RGB_VIDEO - image pre-amp signals from the Video Processor PCB (about 0.5 Vpp).

RESTORE - image DC restorations pulse from Video Processor PCB, logic level positive going 4% duty cycle.

BLANKING - Blanking signal, logic F type.

G1_SUPPLY - supply for G1 grid on CRTs from High Voltage Power Supply (about -150 V).

G1_BIAS - brightness control line from Video Processor PCB (0-5 VDC). RGB_G2 - G2 (black level) control lines from Video Processor PCB (0-3.1 V).

G2_SUPPLY - supply for G2 grid on CRTs from High Voltage Power Supply (about 1200 V).

RGB_ FOCUS - Focus supply for CRTs from the High Voltage Power Supply (approximately 7 kV).

SWEEP_OK - deflection status line from the Horizontal Vertical Deflection PCB. +80 V - from the Low Voltage Power Supply

±15 V - input power for the analog circuitry from the Low Voltage Power Supply.

6.2V - input power for the CRT filaments heaters from the Low Voltage Power Supply.

5-44	Model 250 Service Manual

Image 99

JVC 250 service manual Video Amplifier PCB - Inputs

Contents

2310 Camino Vida Roble Carlsbad, California SERVICE MANUALModel 250 Projector Phone 760 929-5300 Fax 760DECLARATION OF CONFORMITY Manufacturer Hughes JVCChapter 4 Optical Chapter 1 IntroductionChapter 2 System Description Chapter 3 ElectricalChapter 7 Troubleshooting Chapter 8 Software and ProtocolChapter 9 Parts Contents 1.1 Safety1.0 Introductio n 1.3 Acronyms Used 1.2 UpdatesSECAM Contents 2.0 System De scription2.1 Introduction Incoming Power Circuit Power Supplies2.2 Electrical Section Optical Path Igniter Assembly2.3 Optical Section Arc Lamp ModuleCRTs ILA s - Image Light AmplifierInput Cards VICs 2.4 Electronic SectionRelay Lens Assemblies Front Projection LensPrinted Circuit Boards PCB IR Detectors 2.5 Miscellaneous ItemsCRT/Yoke Assemblies Projector CoversEMI Shield Chapter 2---System Description Model 250 Service Manual3.1 Safety 3.0 ElectricalContents AC EMI Filter 3.2. Incoming Power CircuitAC Power Cord AC Circuit BreakerLVPS - Inputs 3.3 Power SuppliesLow Voltage Power Supply LVPS LVPS - Main FunctionsLVPS - Operation 3. Remove the front cover see Projector Covers section Arc Lamp Power Supply ALPSLVPS - Service Adjustments LVPS - Remove and ReplaceALPS - Outputs ALPS - InputsALPS - Operation ALPS - Remove and Replace ALPS - Service AdjustmentsHigh Voltage Power Supply HVPS 3. Remove the front cover see section 6.1 Projector CoversHVPS - Main Functions HVPS - Outputs HVPS - InputsHVPS - Operation HVPS - Service AdjustmentsElectronic Focus Adjustment HVPS - Remove and ReplaceTable 3-1 HVPS - P45 I/O Pinout 10. Disconnect P45 “Control” at upper left of HVPS Igniter Assembly - Operation 3.4 Igniter AssemblyIgniter Assembly - Inputs Igniter Assembly - OutputsIgniter Assembly - Service Adjustments Igniter Assembly - Remove and Replace3. Remove the front cover see Projector Covers section 7. Remove the five #1 Pozi-drive Phillips-head screws Contents 4.0 OpticalArc Lamp - Inputs Arc Lamp - Service Adjustments4.1 Arc Lamp Arc Lamp - Main Functions13. Tighten spider lock down bolt Chapter 4---Optical horizontally. Adjust to center the “hot spot”Model 250 Service Manual Figure 4-2 Arc Lamp alignment fixtureArc Lamp - Remove and Replace 8. Disconnect large blower fan connector Optical Path - Main Function 4.2 Optical PathOptical Path - Inputs Optical Path - OutputsOptical Path - Operation WARNING!!! Wear safety goggles rated X5 when working anywhere near the light path from the arc lamp or the projection lens 4-10 Model 250 Service ManualFigure 4-6 Optical Path Chapter 4---OpticalFigure 4-7 Optical Path Optical Path - Service AdjustmentsTools Needed 3-mm Hex wrench Parts Needed No serviceable parts Model 250 Service ManualTo adjust the XY Positioner ILA Outputs 4.3 ILAILA Main functions ILA InputsILA Operation ILA Service AdjustmentsILA Overlap 14. Loosen the two hex nuts, using a 4-mm hex-head wrench 19. Retighten the two wing nuts and tighten the two hex nuts NOTE Do not use the zoom lens focus while performing this step ILA Remove and Replace Projection Lens - Input Projection Lens - Service Adjustments4.4 Relay Lenses 4.5 Projection LensFigure 4-11 Projection Lens holding screw and removal notch Model 100 Service Manual Chapter 5 Optical3-4-22 5.1 Safety 5.0 ElectronicsContents 5.2 Introduction System Controller PCB - Main Function 5.3 System Controller PCBI/O control for VIC selection Two RS-232 serial interface ports Chapter 5---Electronics Model 250 Service ManualSystem Controller PCB - Inputs System Controller PCB - Outputs System Controller PCB - Operation Figure 5-6 Power On timing sequence Normal Operation Functions System Controller PCB - Remove and Replace 5.4 Video Processor PCB Video Processor PCB - Main FunctionsVideo Processor PCB - Inputs Model 250 Service Manual Chapter 5---Electronics5-12 Video Processor PCB - Outputs Video Processor PCB - Operation Video Processor PCB - Remove and Replace Raster Timing Generator PCB - Main Functions 5.5 Raster Timing Generator PCBRaster Timing Generator PCB - Inputs Raster Timing Generator PCB - Outputs Raster Timing Generator PCB - Operation Raster Timing Generator PCB - Remove and Replace 5.6 Horizontal Vertical Deflection PCB Horizontal Vertical Deflection PCB - Main FunctionsHorizontal Vertical Deflection PCB - Inputs IICSINT - IIC interrupt Figure 5-13 Horizontal/Vertical I/O DiagramModel 250 Service Manual IICCLK - IIC clock line IICDATA - IIC data lineModel 250 Service Manual Chapter 5---Electronics5-23 Vertical Adjustment Pots Horizontal Vertical Deflection PCB - OutputsHorizontal Vertical Deflection PCB - Operation Horizontal Vertical Deflection PCB - Service Adjustments Figure 5-17 Red image needs vertical adjustment increase 5.7 Convergence Deflection PCB Horizontal Vertical Deflection PCB - Remove and ReplaceConvergence Deflection PCB - Main Functions Convergence Deflection PCB - Outputs Convergence Deflection PCB - Inputs5-30 Figure 5-19 Convergence Deflection PCB I/O DiagramModel 250 Service Manual Chapter 5---Electronics5-31 Figure 5-20 Convergence Deflection PCB I/O DiagramModel 250 Service Manual Chapter 5---ElectronicsConvergence Deflection PCB - Operation Convergence Deflection PCB - Remove and Replace 5.8 Scan Reversal PCB Scan Reversal PCB - Main FunctionsScan Reversal PCB - Inputs Scan Reversal PCB - Outputs 5-36 Figure 5-22 Scan Reversal PCB I/O DiagramModel 250 Service Manual Chapter 5---ElectronicsModel 250 Service Manual Chapter 5---Electronics5-37 Scan Reversal PCB - Operation front/upright projection. This means the horizontal scan jumper is plugged into J100, the vertical scan jumper is plugged into J53, and the convergence jumper is plugged into J50 Scan Reversal PCB - Service Adjustments Page Vertical CAUTION! The Model 250 Projector can not beOrientation Convergence5.9 Video Amplifier PCB Scan Reversal PCB - Remove and ReplaceVideo Amplifier PCB - Main Functions Video Amplifier PCB - Inputs 5-45 Figure 5-26 Video Amplifier PCB I/O DiagramModel 250 Service Manual Chapter 5---ElectronicsVideo Amplifier PCB - Outputs Video Amplifier PCB - Operation Video Amplifier PCB - Remove and Replace Page 15. Reinstall in the reverse order from above CRT/Yoke Assemblies - Output 5.10 CRT/Yoke AssembliesCRT/Yoke Assemblies - Main Function CRT/Yoke Assemblies - InputsCRT/Yoke Assemblies - Operation CRT/Yoke Assemblies - Service AdjustmentsCRT Mechanical Focus Figure 5-29 CRT Mechanical Focus adjustments CRT Rotation 12. In the Geometry menu, put a check the Reg Enable box CRT Electronic Focus CRT/Yoke Assemblies - Remove and Replace CAUTION! Use extreme caution to avoid bumping 5.11 Video Input Cards VICsRGBHV VIC - Main Functions Standard RGBHV VICRGBHV VIC - Operation RGBHV VIC - Service AdjustmentsRGBHV VIC - Inputs RGBHV VIC - OutputsGrahics Enhancer Plus RGBHV VIC - Main Functions Graphics Enhancer Plus RGBHV VICGraphics Enhancer Plus VIC - Outputs Graphics Enhancer Plus VIC - InputsGraphics Enhancer Plus VIC - Service Adjustments Graphics Enhancer Plus VIC - OperationGraphics Enhancer Plus VIC - Remove and Replace 4-Input Quad RGBHV VIC 4-Input Quad RGBHV VIC - Main Functions4-Input Quad RGBHV VIC - Inputs Chapter 5---Electronics Model 250 Service ManualIIC CLK - IIC clock line IIC DATA - IIC data line IIC SINT - IIC interrupt line Figure 5-36 4-Input Quad RGBHV VIC4-Input Quad RGBHV VIC - Remove and Replace 4-Input Quad RGBHV VIC - Service Adjustments4-Input Quad RGBHV VIC - Outputs 4-Input Quad RGBHV VIC - OperationYPbPr VIC - Main Functions YPbPr VICYPbPr VIC - Inputs YPbPr VIC - OutputsYPbPr VIC - Operation YPbPr VIC - Remove and Replace YPbPr VIC - Service AdjustmentsQuad Standard Decoder VIC - Main Functions Quad Standard Decoder VICQuad Standard Decoder VIC - Inputs Quad Standard Decoder VIC - OutputsQuad Standard Decoder VIC - Operation Quad Standard Decoder VIC - Service Adjustments Quad Standard Decoder/Line Doubler VICQuad Standard Decoder VIC - Remove and Replace installed in the #2 or 3 VIC 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 Doubler VIC unless it is installed at the factory. The part number for the blank faceplate is p/n 5.12 Backplane PCB see Figure Figure 5-43 Backplane Diagram middle section5-76 Figure 5-44 Backplane Diagram right sideModel 250 Service Manual Chapter 5---ElectronicsModel 250 Service Manual Chapter 5---Electronics5-77 6.0 Miscellaneous Items 6.1 Projector CoversContents 6.2 Electronics Module Tilt-up 6.3 Ventilation 6.4 Air Filters 6.5 IR Detectors6.6 EMI Filter 6.7 Cleaning Lenses, ILA Assemblies and Mirrors Chapter 6---Miscellaneous Items Model 250 Service Manual7.0 Troubleshooting 7.1 SafetyContents Backpanel LEDs 7.2 LEDsFigure 7-1 Rear Panel layout Figure 7-2 Dip Switch Block on System Controller PCB Model 250 Service Manual Video Processor PCB LEDsVideo Processor - Test Points Chapter 7---TroubleshootingVideo Processor - LEDs Figure 7-6 Raster Timing Generator LEDs Raster Timing Generator PCB LEDsChapter 7---Troubleshooting Model 250 Service ManualRaster Timing Generator PCB LEDs Figure 7-7 Convergence Deflection PCB LED Convergence Deflection PCB LEDChapter 7---Troubleshooting Model 250 Service ManualVideo Amplifier PCB LED Backplane PCB LEDs Command ON Timing 7.3 Diagramsto 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. Once the Arc Lamp lights, the Arc Lamp Power Supply, the /LAMPLIT signal goes low and the voltage to the Igniter drops to between 25 V and 31 V. The voltage from the Arc Lamp Power Supply stays at a steady output of 2 kW during normal operation of the projector Image Path Deflection Path The Horizontal Vertical Deflection PCB outputs HOUTFLYBACK to the Scan Reversal PCB. This is the horizontal deflection waveform that drives the horizontal CRT deflection yokes. The HRED+, GRN+, and BLU+ are the horizontal deflection returns. The outputs of the vertical amplifier are VRED+, GRN+, and BLU+. The returns are VRED-, GRN-, and BLU Convergence Deflection PCB and Scan Reversal PCB Chapter 7---TroubleshootingModel 250 Service Manual Figure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB7-18 Chapter 7---TroubleshootingModel 250 Service Manual Figure 7-14 CRT Deflection path between the Scan Reversal PCB and CRTCRT Protection Yoke Connector Detection 7-21 Chapter 7---TroubleshootingModel 250 Service Manual Figure 7-16 CRT Protection path between the Scan Reversal PCB and CRT7.4 Error Codes “No mem available” 4.17 “VIC1 Board Not OK” /VICOK is High BAD on VIC Slot Check 7.5 Troubleshooting GuideProblem Possible SolutionModel 250 Service Manual Troubleshooting on the Backplane PCBFigure 7-17 Backplane Diagram left side Chapter 7---TroubleshootingLow Voltage Power Supply J8 7-28 Figure 7-19 Backplane Diagram right sideChapter 7---Troubleshooting Model 250 Service ManualChapter 7---Troubleshooting Model 250 Service Manual7-29 8.0 Software and Protocol 8.1 Software UpdatingContents Cursor=Block & Blink Terminal Font=Fixedsys Translation=None 11B. From the Windows Terminal Menu normally in Accessories window, select Transfers/Send Text File, then select List Files of Type All Files, and select the disk and/or directory with the Model 250 software. You should see a file named boot.hex. Select this file and press the OK button to begin the upload. Uploading takes about 20 minutes 9600 bps 12A. To update the System Software from the Boot Manager prompt 8.2 Importing/Exporting ConfigurationExporting 4. Windows TERMINAL Transfers + Receive Text FileStop, Pause, Bytes 0, Receiving EXPORT1.TXT Importing Stop, Pause, “% complete bar”, Sending EXPORT1.TXT Null Modem Adapter 8.3 Terminals and Communication Protocols TerminalsTerminal Preferences Action Table 8-3 VT-100 Terminal and Remote Command EquivalentsService Communications ProtocolCenter, H Refer to Section 8.1, Software Updating Model 250 Service Manual Chapter 8---Software and Protocol8-14 Contents 9.0 Parts List9.1 Replacement Parts List DescriptionDescription Power Cord, USA/Japan9.2 Spares QuantityDescription Model 250 Service Manual Chapter 9---Parts ListArc Lamp Cross-member AssemblyGlossary of Terms AmorphousHorizontal Scan Laser Power SupplyField FrameNoise ResolutionLumen LuminanceScan Vertical ResolutionS-Video Saturated ColorFrequency Vertical Scan FrequencyVertical Scan Vertical Synchronization