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JVC 250 service manual Troubleshooting on the Backplane PCB, 17 Backplane Diagram left side, 7-26

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Troubleshooting on the Backplane PCB

Chapter 7---Troubleshooting

Troubleshooting on the Backplane PCB

The connectors on the Backplane PCB provide one of the more accessible places to probe voltages and signals that may be useful for troubleshooting purposes (see Figure 7-18and associated list of signals and voltages).

Figure 7-17Backplane Diagram (left side)

7-26	Model 250 Service Manual

Image 164

JVC service manual Troubleshooting on the Backplane PCB, 17 Backplane Diagram left side, 7-26, Model 250 Service Manual

Contents

SERVICE MANUAL Model 250 ProjectorPhone 760 929-5300 Fax 760 2310 Camino Vida Roble Carlsbad, CaliforniaManufacturer Hughes JVC DECLARATION OF CONFORMITYChapter 1 Introduction Chapter 2 System DescriptionChapter 3 Electrical Chapter 4 OpticalChapter 9 Parts Chapter 7 TroubleshootingChapter 8 Software and Protocol 1.0 Introductio n Contents1.1 Safety 1.2 Updates 1.3 Acronyms UsedSECAM 2.1 Introduction Contents2.0 System De scription 2.2 Electrical Section Incoming Power CircuitPower Supplies Igniter Assembly 2.3 Optical SectionArc Lamp Module Optical PathILA s - Image Light Amplifier CRTs2.4 Electronic Section Relay Lens AssembliesFront Projection Lens Input Cards VICsPrinted Circuit Boards PCB 2.5 Miscellaneous Items CRT/Yoke AssembliesProjector Covers IR DetectorsEMI Shield Model 250 Service Manual Chapter 2---System DescriptionContents 3.1 Safety3.0 Electrical 3.2. Incoming Power Circuit AC Power CordAC Circuit Breaker AC EMI Filter3.3 Power Supplies Low Voltage Power Supply LVPSLVPS - Main Functions LVPS - InputsLVPS - Operation Arc Lamp Power Supply ALPS LVPS - Service AdjustmentsLVPS - Remove and Replace 3. Remove the front cover see Projector Covers sectionALPS - Inputs ALPS - OutputsALPS - Operation ALPS - Service Adjustments ALPS - Remove and ReplaceHVPS - Main Functions High Voltage Power Supply HVPS3. Remove the front cover see section 6.1 Projector Covers HVPS - Inputs HVPS - OutputsHVPS - Service Adjustments HVPS - OperationHVPS - Remove and Replace Electronic Focus AdjustmentTable 3-1 HVPS - P45 I/O Pinout 10. Disconnect P45 “Control” at upper left of HVPS 3.4 Igniter Assembly Igniter Assembly - InputsIgniter Assembly - Outputs Igniter Assembly - Operation3. Remove the front cover see Projector Covers section Igniter Assembly - Service AdjustmentsIgniter Assembly - Remove and Replace 7. Remove the five #1 Pozi-drive Phillips-head screws 4.0 Optical ContentsArc Lamp - Service Adjustments 4.1 Arc LampArc Lamp - Main Functions Arc Lamp - Inputs13. Tighten spider lock down bolt horizontally. Adjust to center the “hot spot” Model 250 Service ManualFigure 4-2 Arc Lamp alignment fixture Chapter 4---OpticalArc Lamp - Remove and Replace 8. Disconnect large blower fan connector 4.2 Optical Path Optical Path - Main FunctionOptical Path - Operation Optical Path - InputsOptical Path - Outputs WARNING!!! Wear safety goggles rated X5 when working anywhere near the light path from the arc lamp or the projection lens Model 250 Service Manual Figure 4-6 Optical PathChapter 4---Optical 4-10Optical Path - Service Adjustments Tools Needed 3-mm Hex wrench Parts Needed No serviceable partsModel 250 Service Manual Figure 4-7 Optical PathTo adjust the XY Positioner 4.3 ILA ILA Main functionsILA Inputs ILA OutputsILA Service Adjustments ILA OperationILA 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 - Service Adjustments 4.4 Relay Lenses4.5 Projection Lens Projection Lens - InputFigure 4-11 Projection Lens holding screw and removal notch 3-4-22 Model 100 Service ManualChapter 5 Optical Contents 5.1 Safety5.0 Electronics 5.2 Introduction 5.3 System Controller PCB System Controller PCB - Main FunctionI/O control for VIC selection Two RS-232 serial interface ports Model 250 Service Manual Chapter 5---ElectronicsSystem 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 Video Processor PCB - Inputs 5.4 Video Processor PCBVideo Processor PCB - Main Functions 5-12 Model 250 Service ManualChapter 5---Electronics Video Processor PCB - Outputs Video Processor PCB - Operation Video Processor PCB - Remove and Replace 5.5 Raster Timing Generator PCB Raster Timing Generator PCB - Main FunctionsRaster Timing Generator PCB - Inputs Raster Timing Generator PCB - Outputs Raster Timing Generator PCB - Operation Raster Timing Generator PCB - Remove and Replace Horizontal Vertical Deflection PCB - Inputs 5.6 Horizontal Vertical Deflection PCBHorizontal Vertical Deflection PCB - Main Functions Figure 5-13 Horizontal/Vertical I/O Diagram Model 250 Service ManualIICCLK - IIC clock line IICDATA - IIC data line IICSINT - IIC interrupt5-23 Model 250 Service ManualChapter 5---Electronics Horizontal Vertical Deflection PCB - Outputs Vertical Adjustment PotsHorizontal Vertical Deflection PCB - Operation Horizontal Vertical Deflection PCB - Service Adjustments Figure 5-17 Red image needs vertical adjustment increase Convergence Deflection PCB - Main Functions 5.7 Convergence Deflection PCBHorizontal Vertical Deflection PCB - Remove and Replace Convergence Deflection PCB - Inputs Convergence Deflection PCB - OutputsFigure 5-19 Convergence Deflection PCB I/O Diagram Model 250 Service ManualChapter 5---Electronics 5-30Figure 5-20 Convergence Deflection PCB I/O Diagram Model 250 Service ManualChapter 5---Electronics 5-31Convergence Deflection PCB - Operation Convergence Deflection PCB - Remove and Replace Scan Reversal PCB - Inputs 5.8 Scan Reversal PCBScan Reversal PCB - Main Functions Scan Reversal PCB - Outputs Figure 5-22 Scan Reversal PCB I/O Diagram Model 250 Service ManualChapter 5---Electronics 5-365-37 Model 250 Service ManualChapter 5---Electronics 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 CAUTION! The Model 250 Projector can not be OrientationConvergence VerticalVideo Amplifier PCB - Main Functions 5.9 Video Amplifier PCBScan Reversal PCB - Remove and Replace Video Amplifier PCB - Inputs Figure 5-26 Video Amplifier PCB I/O Diagram Model 250 Service ManualChapter 5---Electronics 5-45Video Amplifier PCB - Outputs Video Amplifier PCB - Operation Video Amplifier PCB - Remove and Replace Page 15. Reinstall in the reverse order from above 5.10 CRT/Yoke Assemblies CRT/Yoke Assemblies - Main FunctionCRT/Yoke Assemblies - Inputs CRT/Yoke Assemblies - OutputCRT/Yoke Assemblies - Service Adjustments CRT/Yoke Assemblies - OperationCRT 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 5.11 Video Input Cards VICs CAUTION! Use extreme caution to avoid bumpingStandard RGBHV VIC RGBHV VIC - Main FunctionsRGBHV VIC - Service Adjustments RGBHV VIC - InputsRGBHV VIC - Outputs RGBHV VIC - OperationGraphics Enhancer Plus RGBHV VIC Grahics Enhancer Plus RGBHV VIC - Main FunctionsGraphics Enhancer Plus VIC - Inputs Graphics Enhancer Plus VIC - OutputsGraphics Enhancer Plus VIC - Remove and Replace Graphics Enhancer Plus VIC - Service AdjustmentsGraphics Enhancer Plus VIC - Operation 4-Input Quad RGBHV VIC - Inputs 4-Input Quad RGBHV VIC4-Input Quad RGBHV VIC - Main Functions Model 250 Service Manual IIC CLK - IIC clock line IIC DATA - IIC data lineIIC SINT - IIC interrupt line Figure 5-36 4-Input Quad RGBHV VIC Chapter 5---Electronics4-Input Quad RGBHV VIC - Service Adjustments 4-Input Quad RGBHV VIC - Outputs4-Input Quad RGBHV VIC - Operation 4-Input Quad RGBHV VIC - Remove and ReplaceYPbPr VIC YPbPr VIC - Main FunctionsYPbPr VIC - Operation YPbPr VIC - InputsYPbPr VIC - Outputs YPbPr VIC - Service Adjustments YPbPr VIC - Remove and ReplaceQuad Standard Decoder VIC Quad Standard Decoder VIC - Main FunctionsQuad Standard Decoder VIC - Operation Quad Standard Decoder VIC - InputsQuad Standard Decoder VIC - Outputs Quad Standard Decoder VIC - Remove and Replace Quad Standard Decoder VIC - Service AdjustmentsQuad Standard Decoder/Line Doubler VIC 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 Figure 5-43 Backplane Diagram middle section see FigureFigure 5-44 Backplane Diagram right side Model 250 Service ManualChapter 5---Electronics 5-765-77 Model 250 Service ManualChapter 5---Electronics Contents 6.0 Miscellaneous Items6.1 Projector Covers 6.2 Electronics Module Tilt-up 6.3 Ventilation 6.6 EMI Filter 6.4 Air Filters6.5 IR Detectors 6.7 Cleaning Lenses, ILA Assemblies and Mirrors Model 250 Service Manual Chapter 6---Miscellaneous ItemsContents 7.0 Troubleshooting7.1 Safety 7.2 LEDs Backpanel LEDsFigure 7-1 Rear Panel layout Figure 7-2 Dip Switch Block on System Controller PCB Video Processor PCB LEDs Video Processor - Test PointsChapter 7---Troubleshooting Model 250 Service ManualVideo Processor - LEDs Raster Timing Generator PCB LEDs Chapter 7---TroubleshootingModel 250 Service Manual Figure 7-6 Raster Timing Generator LEDsRaster Timing Generator PCB LEDs Convergence Deflection PCB LED Chapter 7---TroubleshootingModel 250 Service Manual Figure 7-7 Convergence Deflection PCB LEDVideo Amplifier PCB LED Backplane PCB LEDs 7.3 Diagrams Command ON Timingto 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 Chapter 7---Troubleshooting Model 250 Service ManualFigure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB Convergence Deflection PCB and Scan Reversal PCBChapter 7---Troubleshooting Model 250 Service ManualFigure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT 7-18CRT Protection Yoke Connector Detection Chapter 7---Troubleshooting Model 250 Service ManualFigure 7-16 CRT Protection path between the Scan Reversal PCB and CRT 7-217.4 Error Codes “No mem available” 4.17 “VIC1 Board Not OK” /VICOK is High BAD on VIC Slot 7.5 Troubleshooting Guide ProblemPossible Solution CheckTroubleshooting on the Backplane PCB Figure 7-17 Backplane Diagram left sideChapter 7---Troubleshooting Model 250 Service ManualLow Voltage Power Supply J8 Figure 7-19 Backplane Diagram right side Chapter 7---TroubleshootingModel 250 Service Manual 7-287-29 Chapter 7---TroubleshootingModel 250 Service Manual Contents 8.0 Software and Protocol8.1 Software Updating 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 Configuration 8.2 Importing/ExportingStop, Pause, Bytes 0, Receiving EXPORT1.TXT Exporting4. Windows TERMINAL Transfers + Receive Text File Importing Stop, Pause, “% complete bar”, Sending EXPORT1.TXT Null Modem Adapter Terminal Preferences 8.3 Terminals and Communication ProtocolsTerminals Table 8-3 VT-100 Terminal and Remote Command Equivalents ServiceCommunications Protocol ActionCenter, H Refer to Section 8.1, Software Updating 8-14 Model 250 Service ManualChapter 8---Software and Protocol 9.0 Parts List 9.1 Replacement Parts ListDescription ContentsPower Cord, USA/Japan DescriptionDescription 9.2 SparesQuantity Chapter 9---Parts List Model 250 Service ManualCross-member Assembly Glossary of TermsAmorphous Arc LampLaser Power Supply FieldFrame Horizontal ScanResolution LumenLuminance NoiseVertical Resolution S-VideoSaturated Color ScanVertical Scan Frequency Vertical ScanVertical Synchronization Frequency