Manuals / JVC / Computer Equipment / Projector

JVC 250 service manual Video Amplifier PCB LED

Models: 250

1 190

Download 190 pages 59.74 Kb

Page 148

Video Amplifier PCB LED

Chapter 7---Troubleshooting

Video Amplifier PCB LED

Figure 7-8Video Amplifier PCB LED.

The VA_OK LED on the Video Amplifier PCB is illuminated green when all the CRT deflection circuits are operating properly (/DEFL_OK), the supply voltages (±15 V, +6.2 V, and +80 V) are present at the Video Amplifier PCB, and all the CRT Yoke connectors are properly installed (see Figure 7-15and Figure 7-16).

7-10	Model 250 Service Manual

Image 148

JVC 250 service manual Video Amplifier PCB LED

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 8 Software and Protocol Chapter 7 TroubleshootingChapter 9 Parts 1.1 Safety Contents1.0 Introductio n 1.2 Updates 1.3 Acronyms UsedSECAM 2.0 System De scription Contents2.1 Introduction Power Supplies Incoming Power Circuit2.2 Electrical Section 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 Chapter 2---System Description 3.0 Electrical 3.1 SafetyContents 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 Replace3. Remove the front cover see section 6.1 Projector Covers High Voltage Power Supply HVPSHVPS - Main Functions 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 - OperationIgniter Assembly - Remove and Replace Igniter Assembly - Service Adjustments3. Remove the front cover see Projector Covers section 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 - Outputs Optical Path - InputsOptical Path - Operation 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 Chapter 5 Optical Model 100 Service Manual3-4-22 5.0 Electronics 5.1 SafetyContents 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 - Main Functions 5.4 Video Processor PCBVideo Processor PCB - Inputs Chapter 5---Electronics Model 250 Service Manual5-12 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 - Main Functions 5.6 Horizontal Vertical Deflection PCBHorizontal Vertical Deflection PCB - Inputs Figure 5-13 Horizontal/Vertical I/O Diagram Model 250 Service ManualIICCLK - IIC clock line IICDATA - IIC data line IICSINT - IIC interruptChapter 5---Electronics Model 250 Service Manual5-23 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 Horizontal Vertical Deflection PCB - Remove and Replace 5.7 Convergence Deflection PCBConvergence Deflection PCB - Main Functions 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 - Main Functions 5.8 Scan Reversal PCBScan Reversal PCB - Inputs Scan Reversal PCB - Outputs Figure 5-22 Scan Reversal PCB I/O Diagram Model 250 Service ManualChapter 5---Electronics 5-36Chapter 5---Electronics Model 250 Service Manual5-37 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 CAUTION! The Model 250 Projector can not be OrientationConvergence VerticalScan Reversal PCB - Remove and Replace 5.9 Video Amplifier PCBVideo Amplifier PCB - Main Functions 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 - Operation Graphics Enhancer Plus VIC - Service AdjustmentsGraphics Enhancer Plus VIC - Remove and Replace 4-Input Quad RGBHV VIC - Main Functions 4-Input Quad RGBHV VIC4-Input Quad RGBHV VIC - Inputs 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 - Outputs YPbPr VIC - InputsYPbPr VIC - Operation YPbPr VIC - Service Adjustments YPbPr VIC - Remove and ReplaceQuad Standard Decoder VIC Quad Standard Decoder VIC - Main FunctionsQuad Standard Decoder VIC - Outputs Quad Standard Decoder VIC - InputsQuad Standard Decoder VIC - Operation Quad Standard Decoder/Line Doubler VIC Quad Standard Decoder VIC - Service AdjustmentsQuad 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 Figure 5-43 Backplane Diagram middle section see FigureFigure 5-44 Backplane Diagram right side Model 250 Service ManualChapter 5---Electronics 5-76Chapter 5---Electronics Model 250 Service Manual5-77 6.1 Projector Covers 6.0 Miscellaneous ItemsContents 6.2 Electronics Module Tilt-up 6.3 Ventilation 6.5 IR Detectors 6.4 Air Filters6.6 EMI Filter 6.7 Cleaning Lenses, ILA Assemblies and Mirrors Model 250 Service Manual Chapter 6---Miscellaneous Items7.1 Safety 7.0 TroubleshootingContents 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 7-28Model 250 Service Manual Chapter 7---Troubleshooting7-29 8.1 Software Updating 8.0 Software and ProtocolContents 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/Exporting4. Windows TERMINAL Transfers + Receive Text File ExportingStop, Pause, Bytes 0, Receiving EXPORT1.TXT Importing Stop, Pause, “% complete bar”, Sending EXPORT1.TXT Null Modem Adapter Terminals 8.3 Terminals and Communication ProtocolsTerminal Preferences Table 8-3 VT-100 Terminal and Remote Command Equivalents ServiceCommunications Protocol ActionCenter, H Refer to Section 8.1, Software Updating Chapter 8---Software and Protocol Model 250 Service Manual8-14 9.0 Parts List 9.1 Replacement Parts ListDescription ContentsPower Cord, USA/Japan DescriptionQuantity 9.2 SparesDescription 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