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JVC 250 service manual Ventilation, 1Electronics Module hinge and locking mechanism

Models: 250

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Chapter 6---Miscellaneous Items

Figure 6-1Electronics Module hinge and locking mechanism.

6.3Ventilation

Adequate cooling is a major consideration for the Model 250 projector. There are thirteen cooling fans (including the Arc Lamp blower) in this projector.

!4 fans in the main chassis - two in the rear of the projector, one in the right front corner and one on the bottom of the projector. These fans bring cool air into the chassis of the projector. Each of these fans has an air filter in front of it.

!3 fans in the Electronics Module - two smaller fans force cool air across the Horizontal Vertical Deflection PCB on the top of the Electronics Module and one large fan forces cool air into the body of the Electronic Module

!3 fans in the Optics Module - one fan draws hot air from the #1 Cold Mirror, the other two fans draw hot air off of the Prism Assembly.

!3 fans for the Arc Lamp Module - one large fan is mounted on the door of the Arc Lamp housing, with one smaller fan mounted on the top. The large blower is on the side of the Arc Lamp housing. All of these fans force cool air in to cool the Arc Lamp.

All cooling fans are powered by +24 V from the Low Voltage Power Supply except the large blower for the Arc Lamp. The large blower is powered by AC power that is switched on and off by a relay switch. The relay switch is powered by +24 V so effectively, the +24 V turns on all the cooling fans. The cooling fans turn on as soon as the AC Circuit Breaker is powered ON.

Model 250 Service Manual

6-3

Image 135

JVC 250 service manual Ventilation, 1Electronics Module hinge and locking mechanism

Contents

Model 250 Projector Manufacturer Hughes JVC Declaration of ConformityTable of Contents Troubleshooting Software and ProtocolParts Safety ContentsUpdates Acronyms Used Secam Introduction ContentsIncoming Power Circuit Power SuppliesElectrical Section Optical Path Igniter AssemblyOptical Section Arc Lamp ModuleCRTs ILA s Image Light AmplifierInput Cards VICs Electronic SectionRelay Lens Assemblies Front Projection LensPrinted Circuit Boards PCB Miscellaneous Items EMI Shield System Description Electrical SafetyAC EMI Filter Incoming Power CircuitAC Power Cord AC Circuit BreakerLvps Inputs Power SuppliesLow Voltage Power Supply Lvps Lvps Main FunctionsLvps Operation 1Low Voltage Power Supply I/O DiagramAlps Main Functions Arc Lamp Power Supply AlpsLvps Service Adjustments Lvps Remove and ReplaceAlps Outputs Alps InputsAlps Operation 2Arc Lamp Power Supply signals and voltagesAlps Remove and Replace Alps Service AdjustmentsHvps Main Functions High Voltage Power Supply HvpsHvps Outputs Hvps InputsHvps Operation Hvps Service AdjustmentsHvps Remove and Replace 5High Voltage Power Supply coverPIN # Electrical Igniter Assembly Operation Igniter AssemblyIgniter Assembly Inputs Igniter Assembly OutputsIgniter Assembly Remove and Replace Igniter Assembly Service AdjustmentsElectrical Optical Arc Lamp Inputs Arc Lamp Service AdjustmentsArc Lamp Arc Lamp Main FunctionsOptical 2Arc Lamp alignment fixture Arc Lamp Remove and Replace 3Arc Lamp Assembly access doorOptical Optical Path Main Function Optical PathOptical Path Inputs Optical Path OutputsOptical Path Operation Optical 6Optical Path 7Optical Path Optical Path Service Adjustments8XY Positioner adjust holes ILA Outputs ILAILA Main functions ILA InputsILA Operation ILA Service AdjustmentsOptical Optical Optical Optical ILA Remove and Replace Projection Lens Relay LensesOptical Optical Electronics 1Model 250 System Block Diagram System Controller PCB Main Function System Controller PCBElectronics Electronics System Controller PCB Inputs 5System Controller PCB I/O Diagram for other PCBsSystem Controller PCB Outputs System Controller PCB Operation Electronics System Controller PCB Remove and Replace Video Processor PCB Video Processor PCB Main FunctionsVideo Processor PCB Inputs 7Video Processor PCB I/O diagram for VICs and Power Supplies Video Processor PCB Outputs 8Video Processor PCB I/O diagram for PCBsVideo Processor PCB Operation Video Processor PCB Remove and Replace 9Video Processor PCB LEDsRaster Timing Generator PCB Main Functions Raster Timing Generator PCBRaster Timing Generator PCB Inputs 11Raster Timing Generator for other PCBsRaster Timing Generator PCB Outputs Raster Timing Generator PCB Operation Raster Timing Generator PCB Remove and Replace 12LEDs on the Raster Timing Generator PCBHorizontal Vertical Deflection PCB Horizontal Vertical Deflection PCB Main FunctionsHorizontal Vertical Deflection PCB Inputs 13Horizontal/Vertical I/O Diagram Electronics Horizontal Vertical Deflection PCB Outputs Horizontal Vertical Deflection PCB Operation 16Red image needs vertical adjustment decrease Horizontal Vertical Deflection PCB Service AdjustmentsElectronics Convergence Deflection PCB Horizontal Vertical Deflection PCB Remove and ReplaceConvergence Deflection PCB Main Functions Convergence Deflection PCB Outputs Convergence Deflection PCB Inputs19Convergence Deflection PCB I/O Diagram 20Convergence Deflection PCB I/O Diagram Convergence Deflection PCB Operation 21Physical layout of the Convergence/Deflection PCBConvergence Deflection PCB Remove and Replace Scan Reversal PCB Scan Reversal PCB Main FunctionsScan Reversal PCB Inputs Scan Reversal PCB Outputs 22Scan Reversal PCB I/O Diagram Electronics Scan Reversal PCB Operation 24Scan Reversal PCB I/O Diagram for CRT YokesElectronics Scan Reversal PCB Service Adjustments Electronics 1Projection orientation jumper settings Video Amplifier PCB Scan Reversal PCB Remove and ReplaceVideo Amplifier PCB Main Functions Video Amplifier PCB Inputs 26Video Amplifier PCB I/O Diagram Video Amplifier PCB Outputs Video Amplifier PCB Operation Video Amplifier PCB Remove and Replace Electronics 28Video Amplifier PCB showing CRT Socket Connectors CRT/Yoke Assemblies Output 10 CRT/Yoke AssembliesCRT/Yoke Assemblies Main Function CRT/Yoke Assemblies InputsCRT/Yoke Assemblies Operation CRT/Yoke Assemblies Service AdjustmentsElectronics Electronics Electronics 30View of CRTs, Relay lenses and ILA Assemblies CRT/Yoke Assemblies Remove and Replace Video Input Cards VICs Rgbhv VIC Main Functions Standard Rgbhv VICRgbhv VIC Operation Rgbhv VIC Service AdjustmentsRgbhv VIC Inputs Rgbhv VIC OutputsGrahics 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 Input Quad Rgbhv VIC Input Quad Rgbhv VIC Main FunctionsInput Quad Rgbhv VIC Inputs 364-Input Quad Rgbhv VIC Input Quad Rgbhv VIC Remove and Replace Input Quad Rgbhv VIC Service AdjustmentsInput Quad Rgbhv VIC Outputs Input Quad Rgbhv VIC OperationYPbPr 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 Electronics Backplane PCB 42Backplane Diagram left sideSee Figure 44Backplane Diagram right side Electronics Projector Covers Miscellaneous ItemsElectronics Module Tilt-up 1Electronics Module hinge and locking mechanism VentilationAir Filters IR DetectorsEMI Filter Cleaning Lenses, ILA Assemblies and Mirrors Miscellaneous Items Troubleshooting Backpanel LEDs LEDsTroubleshooting Troubleshooting Video Processor Test Points Video Processor PCB LEDsVideo Processor LEDs 6Raster Timing Generator LEDs Raster Timing Generator PCB LEDsRaster Timing Generator PCB LEDs Convergence Deflection PCB LED Video Amplifier PCB LED Backplane PCB LEDs Command on Timing DiagramsTroubleshooting Image Path Deflection Path Troubleshooting Troubleshooting 14CRT Deflection path between the Scan Reversal PCB and CRT CRT Protection Troubleshooting 16CRT Protection path between the Scan Reversal PCB and CRT IIC Handler Error CodesTroubleshooting Troubleshooting Problem Check Possible Solution Section Troubleshooting Guide17Backplane Diagram left side Troubleshooting on the Backplane PCBLamplit Lampok Lampena Coveron GND 19Backplane Diagram right side Troubleshooting Software Updating Software and ProtocolCommand Software and Protocol Updating Importing/Exporting ConfigurationWindows Terminal Transfers + Receive Text File ExportingImporting Similar message is displayed on the projector screenStop, Pause, % complete bar, Sending EXPORT1.TXT Null Modem Adapter Data Transfer Error Example Model 250 Menu will displayTerminals and Communication Protocols TerminalsTerminal Preferences Communications Protocol POS RGB Software and Protocol Software and Protocol Description Replacement Parts ListDescription Description Quantity SparesParts List Aspect Ratio Cross-member AssemblyAmorphous Arc LampHorizontal Scan Laser Power SupplyField FrameNoise ResolutionLumen LuminanceScan Vertical ResolutionVideo Saturated ColorFrequency Vertical Scan FrequencyVertical Scan Vertical Synchronization