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JVC 250 service manual Scan Reversal PCB - Operation

Models: 250

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Scan Reversal PCB - Operation

Chapter 5---Electronics

Figure 5-24Scan Reversal PCB I/O Diagram 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. The Scan Reversal PCB outputs the convergence and deflection waveforms that drive the CRT convergence and deflection yokes, and it contributes significantly to the CRT Protection circuit.

The Scan Reversal PCB provides an interface for reversing the projection mode from front to rear projection and from upright to inverted (upside down) mounting projection setups. The projection modes are changed by switching a jumper from one connector to another on the Scan Reversal PCB. J100 and J101 are for horizontal scan connections. J53 and J53A are the vertical scan connections, and J50 and J50A are convergence jumper connections. The Model 250 comes set for

5-38	Model 250 Service Manual

Image 93

JVC 250 service manual Scan Reversal PCB - Operation

Contents

Model 250 Projector SERVICE MANUALPhone 760 929-5300 Fax 760 2310 Camino Vida Roble Carlsbad, CaliforniaDECLARATION OF CONFORMITY Manufacturer Hughes JVCChapter 2 System Description Chapter 1 IntroductionChapter 3 Electrical Chapter 4 OpticalChapter 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 2.3 Optical Section Igniter AssemblyArc Lamp Module Optical PathCRTs ILA s - Image Light AmplifierRelay Lens Assemblies 2.4 Electronic SectionFront Projection Lens Input Cards VICsPrinted Circuit Boards PCB CRT/Yoke Assemblies 2.5 Miscellaneous ItemsProjector Covers IR DetectorsEMI Shield Chapter 2---System Description Model 250 Service Manual3.1 Safety 3.0 ElectricalContents AC Power Cord 3.2. Incoming Power CircuitAC Circuit Breaker AC EMI FilterLow Voltage Power Supply LVPS 3.3 Power SuppliesLVPS - Main Functions LVPS - InputsLVPS - Operation LVPS - Service Adjustments Arc Lamp Power Supply ALPSLVPS - Remove and Replace 3. Remove the front cover see Projector Covers sectionALPS - 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 - Inputs 3.4 Igniter AssemblyIgniter Assembly - Outputs Igniter Assembly - OperationIgniter 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 Optical4.1 Arc Lamp Arc Lamp - Service AdjustmentsArc Lamp - Main Functions Arc Lamp - Inputs13. Tighten spider lock down bolt Model 250 Service Manual horizontally. Adjust to center the “hot spot”Figure 4-2 Arc Lamp alignment fixture Chapter 4---OpticalArc 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 Figure 4-6 Optical Path Model 250 Service ManualChapter 4---Optical 4-10Tools Needed 3-mm Hex wrench Parts Needed No serviceable parts Optical Path - Service AdjustmentsModel 250 Service Manual Figure 4-7 Optical PathTo adjust the XY Positioner ILA Main functions 4.3 ILAILA Inputs ILA OutputsILA 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 4.4 Relay Lenses Projection Lens - Service Adjustments4.5 Projection Lens Projection Lens - InputFigure 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 Model 250 Service Manual Figure 5-13 Horizontal/Vertical I/O DiagramIICCLK - IIC clock line IICDATA - IIC data line IICSINT - IIC interruptModel 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 - InputsModel 250 Service Manual Figure 5-19 Convergence Deflection PCB I/O DiagramChapter 5---Electronics 5-30Model 250 Service Manual Figure 5-20 Convergence Deflection PCB I/O DiagramChapter 5---Electronics 5-31Convergence 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 Model 250 Service Manual Figure 5-22 Scan Reversal PCB I/O DiagramChapter 5---Electronics 5-36Model 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 Orientation CAUTION! The Model 250 Projector can not beConvergence Vertical5.9 Video Amplifier PCB Scan Reversal PCB - Remove and ReplaceVideo Amplifier PCB - Main Functions Video Amplifier PCB - Inputs Model 250 Service Manual Figure 5-26 Video Amplifier PCB I/O DiagramChapter 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 CRT/Yoke Assemblies - Main Function 5.10 CRT/Yoke AssembliesCRT/Yoke Assemblies - Inputs CRT/Yoke Assemblies - OutputCRT/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 - Inputs RGBHV VIC - Service AdjustmentsRGBHV VIC - Outputs RGBHV VIC - OperationGrahics 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 IIC CLK - IIC clock line IIC DATA - IIC data line Model 250 Service ManualIIC SINT - IIC interrupt line Figure 5-36 4-Input Quad RGBHV VIC Chapter 5---Electronics4-Input Quad RGBHV VIC - Outputs 4-Input Quad RGBHV VIC - Service Adjustments4-Input Quad RGBHV VIC - Operation 4-Input Quad RGBHV VIC - Remove and ReplaceYPbPr 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 sectionModel 250 Service Manual Figure 5-44 Backplane Diagram right sideChapter 5---Electronics 5-76Model 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 Video Processor - Test Points Video Processor PCB LEDsChapter 7---Troubleshooting Model 250 Service ManualVideo Processor - LEDs Chapter 7---Troubleshooting Raster Timing Generator PCB LEDsModel 250 Service Manual Figure 7-6 Raster Timing Generator LEDsRaster Timing Generator PCB LEDs Chapter 7---Troubleshooting Convergence Deflection PCB LEDModel 250 Service Manual Figure 7-7 Convergence Deflection PCB LEDVideo 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 Model 250 Service Manual Chapter 7---TroubleshootingFigure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB Convergence Deflection PCB and Scan Reversal PCBModel 250 Service Manual Chapter 7---TroubleshootingFigure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT 7-18CRT Protection Yoke Connector Detection Model 250 Service Manual Chapter 7---TroubleshootingFigure 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 Problem 7.5 Troubleshooting GuidePossible Solution CheckFigure 7-17 Backplane Diagram left side Troubleshooting on the Backplane PCBChapter 7---Troubleshooting Model 250 Service ManualLow Voltage Power Supply J8 Chapter 7---Troubleshooting Figure 7-19 Backplane Diagram right sideModel 250 Service Manual 7-28Chapter 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 Service Table 8-3 VT-100 Terminal and Remote Command EquivalentsCommunications Protocol ActionCenter, H Refer to Section 8.1, Software Updating Model 250 Service Manual Chapter 8---Software and Protocol8-14 9.1 Replacement Parts List 9.0 Parts ListDescription ContentsDescription Power Cord, USA/Japan9.2 Spares QuantityDescription Model 250 Service Manual Chapter 9---Parts ListGlossary of Terms Cross-member AssemblyAmorphous Arc LampField Laser Power SupplyFrame Horizontal ScanLumen ResolutionLuminance NoiseS-Video Vertical ResolutionSaturated Color ScanVertical Scan Vertical Scan FrequencyVertical Synchronization Frequency