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JVC 250 service manual 43 Backplane Diagram middle section, see Figure

Models: 250

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Figure 5-43Backplane Diagram (middle section).

Chapter 5---Electronics

Figure 5-43Backplane Diagram (middle section).

The following is a list of pins that would be helpful for troubleshooting purposes.

Low Voltage Power Supply (J8)		High Voltage Power Supply (J7)
Pin #	Signal or Voltage	Pin #	Signal or Voltage
8	/LV_ENA	5	/HV_OK
9	/LV_OK	8	+80 V
10	+24 V_FANS	9	+15 V
11	_5.1 V Stdby	10	-15 V
12	+5.1 V	11	G1 SUPPLY
13	+6.2 V	12	/VA_OK
14	+15 V	1-4	GND

15-15 V

16+80 V

17/COVER_ON

18/FAN_ENA

1-7 GND

Arc Lamp Power Supply (9)			(28)

Pin #	Signal or Voltage	(see Figure 5-44)
2	/LAMP_LIT		Pin #		Signal or Voltage
3	/LAMP_OK	1			+5.1 V Stdby
4	/LAMP_ENA	2			GND
5	/COVER_ON	3			/COVER_ON
1, 6	GND

Model 250 Service Manual

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JVC 250 service manual 43 Backplane Diagram middle section, see Figure

Contents

Phone 760 929-5300 Fax 760 SERVICE MANUALModel 250 Projector 2310 Camino Vida Roble Carlsbad, CaliforniaManufacturer Hughes JVC DECLARATION OF CONFORMITYChapter 3 Electrical Chapter 1 IntroductionChapter 2 System Description 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 Arc Lamp Module Igniter Assembly2.3 Optical Section Optical PathILA s - Image Light Amplifier CRTsFront Projection Lens 2.4 Electronic SectionRelay Lens Assemblies Input Cards VICsPrinted Circuit Boards PCB Projector Covers 2.5 Miscellaneous ItemsCRT/Yoke Assemblies IR DetectorsEMI Shield Model 250 Service Manual Chapter 2---System Description3.0 Electrical 3.1 SafetyContents AC Circuit Breaker 3.2. Incoming Power CircuitAC Power Cord AC EMI FilterLVPS - Main Functions 3.3 Power SuppliesLow Voltage Power Supply LVPS LVPS - InputsLVPS - Operation LVPS - Remove and Replace Arc Lamp Power Supply ALPSLVPS - Service Adjustments 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 Igniter Assembly - Outputs 3.4 Igniter AssemblyIgniter Assembly - Inputs 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 - Main Functions Arc Lamp - Service Adjustments4.1 Arc Lamp Arc Lamp - Inputs13. Tighten spider lock down bolt Figure 4-2 Arc Lamp alignment fixture horizontally. Adjust to center the “hot spot”Model 250 Service Manual 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 Chapter 4---Optical Model 250 Service ManualFigure 4-6 Optical Path 4-10Model 250 Service Manual Optical Path - Service AdjustmentsTools Needed 3-mm Hex wrench Parts Needed No serviceable parts Figure 4-7 Optical PathTo adjust the XY Positioner ILA Inputs 4.3 ILAILA Main functions 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 4.5 Projection Lens Projection Lens - Service Adjustments4.4 Relay Lenses 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 IICCLK - IIC clock line IICDATA - IIC data line Figure 5-13 Horizontal/Vertical I/O DiagramModel 250 Service Manual 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 - OutputsChapter 5---Electronics Figure 5-19 Convergence Deflection PCB I/O DiagramModel 250 Service Manual 5-30Chapter 5---Electronics Figure 5-20 Convergence Deflection PCB I/O DiagramModel 250 Service Manual 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 Chapter 5---Electronics Figure 5-22 Scan Reversal PCB I/O DiagramModel 250 Service Manual 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 Convergence CAUTION! The Model 250 Projector can not beOrientation VerticalScan Reversal PCB - Remove and Replace 5.9 Video Amplifier PCBVideo Amplifier PCB - Main Functions Video Amplifier PCB - Inputs Chapter 5---Electronics Figure 5-26 Video Amplifier PCB I/O DiagramModel 250 Service Manual 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 - Inputs 5.10 CRT/Yoke AssembliesCRT/Yoke Assemblies - Main Function 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 - Outputs RGBHV VIC - Service AdjustmentsRGBHV VIC - Inputs 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 IIC SINT - IIC interrupt line Figure 5-36 4-Input Quad RGBHV VIC Model 250 Service ManualIIC CLK - IIC clock line IIC DATA - IIC data line Chapter 5---Electronics4-Input Quad RGBHV VIC - Operation 4-Input Quad RGBHV VIC - Service Adjustments4-Input Quad RGBHV VIC - Outputs 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 FigureChapter 5---Electronics Figure 5-44 Backplane Diagram right sideModel 250 Service Manual 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 Chapter 7---Troubleshooting Video Processor PCB LEDsVideo Processor - Test Points Model 250 Service ManualVideo Processor - LEDs Model 250 Service Manual Raster Timing Generator PCB LEDsChapter 7---Troubleshooting Figure 7-6 Raster Timing Generator LEDsRaster Timing Generator PCB LEDs Model 250 Service Manual Convergence Deflection PCB LEDChapter 7---Troubleshooting 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 Figure 7-13 CRT Deflection path between Horiz/Vert Deflection PCB Chapter 7---TroubleshootingModel 250 Service Manual Convergence Deflection PCB and Scan Reversal PCBFigure 7-14 CRT Deflection path between the Scan Reversal PCB and CRT Chapter 7---TroubleshootingModel 250 Service Manual 7-18CRT Protection Yoke Connector Detection Figure 7-16 CRT Protection path between the Scan Reversal PCB and CRT Chapter 7---TroubleshootingModel 250 Service Manual 7-217.4 Error Codes “No mem available” 4.17 “VIC1 Board Not OK” /VICOK is High BAD on VIC Slot Possible Solution 7.5 Troubleshooting GuideProblem CheckChapter 7---Troubleshooting Troubleshooting on the Backplane PCBFigure 7-17 Backplane Diagram left side Model 250 Service ManualLow Voltage Power Supply J8 Model 250 Service Manual Figure 7-19 Backplane Diagram right sideChapter 7---Troubleshooting 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 Communications Protocol Table 8-3 VT-100 Terminal and Remote Command EquivalentsService ActionCenter, H Refer to Section 8.1, Software Updating Chapter 8---Software and Protocol Model 250 Service Manual8-14 Description 9.0 Parts List9.1 Replacement Parts List ContentsPower Cord, USA/Japan DescriptionQuantity 9.2 SparesDescription Chapter 9---Parts List Model 250 Service ManualAmorphous Cross-member AssemblyGlossary of Terms Arc LampFrame Laser Power SupplyField Horizontal ScanLuminance ResolutionLumen NoiseSaturated Color Vertical ResolutionS-Video ScanVertical Synchronization Vertical Scan FrequencyVertical Scan Frequency