Manuals / JVC / Computer Equipment / Projector

JVC 250 service manual Scan Reversal PCB - Main Functions, Scan Reversal PCB - Inputs

Models: 250

1 190

Download 190 pages 59.74 Kb

Page 89

5.8Scan Reversal PCB

Chapter 5---Electronics

8.Reinstall the Convergence/Deflection PCB by lowering the right side in first until it clears the electronic module edge, then lowering the left side in.

NOTE: It may be necessary to fit the top 2 fins of the heat sync over the electronic module frame lip at the left to get enough clearance for the right side to be installed. Carefully fit the board over the mounting screws and slide the PCB into position. Tighten the screws and reconnect the connectors.

5.8Scan Reversal PCB

Scan Reversal PCB - Main Functions

!Reverses of scan in both horizontal and vertical axes

!Outputs deflection waveform to the Deflection Yokes on the CRTs

!Outputs convergence data to Convergence Yokes on the CRT

!Horizontal width adjustment for each color (R, G &B)

!Scan failure detection for (horizontal and vertical) deflection amplifiers

Scan Reversal PCB - Inputs

H_OUT_FLYBACK - output horizontal deflection waveform from the Horizontal Vertical Deflection PCB (about 800 Vpp).

H_LOCK (pos.) - horizontal interlock for the yoke connectors from the Horizontal Vertical Deflection PCB (about 5 V when closed, 15 V when open).

H_RGB (pos.) - return of horizontal deflection waveform to the Horizontal Vertical Deflection PCB.

V_RGB (pos.) - output signals of red, green, and blue from the Vertical Amplifier of the Horizontal Vertical Deflection PCB (about 40 Vpp).

X_RGB (pos.) - output signals of the red, green, and blue from the Horizontal Convergence Amplifier for the X-axis from the Convergence Deflection PCB.

Y_RGB (pos.) - output signals of the red, green, and blue from the Horizontal Convergence Amplifier for the Y-axis from the Convergence Deflection PCB.

±15 V - input power from the Horizontal Vertical Deflection PCB for the analog circuitry.

+5.1 V - input power from the Horizontal Vertical Deflection PCB for the digital circuitry.

From Yokes

H_RGB_YOKE (neg.) - bottom of red, green, and blue horizontal deflection yokes.

V_RGB_YOKE (neg.) - bottom of red, green, and blue vertical deflection yokes.

X_RGB_YOKE (neg.) - bottom of red, green, and blue x-axis convergence yokes.

5-34	Model 250 Service Manual

Image 89

JVC 250 service manual Scan Reversal PCB - Main Functions, Scan Reversal PCB - Inputs

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 9 Parts Chapter 7 TroubleshootingChapter 8 Software and Protocol 1.0 Introductio n Contents1.1 Safety 1.3 Acronyms Used 1.2 UpdatesSECAM 2.1 Introduction Contents2.0 System De scription 2.2 Electrical Section Incoming Power CircuitPower Supplies 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 ManualContents 3.1 Safety3.0 Electrical 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 AdjustmentsHVPS - Main Functions High Voltage Power Supply HVPS3. Remove the front cover see section 6.1 Projector Covers 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 - 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 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 - 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 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 3-4-22 Model 100 Service ManualChapter 5 Optical Contents 5.1 Safety5.0 Electronics 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 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 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 Horizontal Vertical Deflection PCB - Inputs 5.6 Horizontal Vertical Deflection PCBHorizontal Vertical Deflection PCB - Main Functions Model 250 Service Manual Figure 5-13 Horizontal/Vertical I/O DiagramIICCLK - IIC clock line IICDATA - IIC data line IICSINT - IIC interrupt5-23 Model 250 Service ManualChapter 5---Electronics 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 Convergence Deflection PCB - Main Functions 5.7 Convergence Deflection PCBHorizontal Vertical Deflection PCB - Remove and Replace 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 Scan Reversal PCB - Inputs 5.8 Scan Reversal PCBScan Reversal PCB - Main Functions Scan Reversal PCB - Outputs Model 250 Service Manual Figure 5-22 Scan Reversal PCB I/O DiagramChapter 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 Orientation CAUTION! The Model 250 Projector can not beConvergence VerticalVideo Amplifier PCB - Main Functions 5.9 Video Amplifier PCBScan Reversal PCB - Remove and Replace 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 - 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 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 - Operation YPbPr VIC - InputsYPbPr VIC - Outputs YPbPr VIC - Remove and Replace YPbPr VIC - Service AdjustmentsQuad Standard Decoder VIC - Main Functions Quad Standard Decoder VICQuad 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 see Figure Figure 5-43 Backplane Diagram middle sectionModel 250 Service Manual Figure 5-44 Backplane Diagram right sideChapter 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 Chapter 6---Miscellaneous Items Model 250 Service ManualContents 7.0 Troubleshooting7.1 Safety 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 7-287-29 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 8.2 Importing/Exporting ConfigurationStop, 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 Service Table 8-3 VT-100 Terminal and Remote Command EquivalentsCommunications Protocol ActionCenter, H Refer to Section 8.1, Software Updating 8-14 Model 250 Service ManualChapter 8---Software and Protocol 9.1 Replacement Parts List 9.0 Parts ListDescription ContentsDescription Power Cord, USA/JapanDescription 9.2 SparesQuantity 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