2for reference to part numbers, if necessary | JVC 340 SC, 330

Chapter 4—Maintenance

Table 4-2for reference to part numbers, if necessary.

4-24	Model 330. 340SC, 370SC Service Manual

Image 137

JVC 340 SC, 330, 370 SC service manual 2for reference to part numbers, if necessary

Contents

Hughes-JVC Technology Corporation Model Model 340 SC Model 370 SC Confidential and proprietary information Manufacturer Hughes-JVC Technology Corporation Introduction Safety Equipment Projector Weight Installation Safeguards Light Safeguards Heat SafeguardsFans Ultra Violet and Infrared Light Viii Ventilation and Foreign Object Retrieval Fluid SafeguardsPower Supply Safety Safety Acronyms Used In Manual Hardware Compatibility SafetyUpdates Software Graphics enhancement Memories Decoder board option Functional Descriptions Contents Cover and Base 1Model 330, 340SC and 370SC System Block Diagrams Electronics Systems Overview External Power Requirements Functional Descriptions System Power Supply System Power STB STB AC Input CRT SCB HDB VDB VPB RTG VAB Arc Lamp Ignitor 4System Power Supply Input/Output Diagram 22-30V depending on projector model High Voltage Power Supply High Voltage Power Supply Functional Descriptions Card Cage 104668 Backplane Board 100571 Circuit Boards Functional Descriptions 10Raster Generation Block Diagram Raster Timing Generator Board RTG p/n 11Raster Timing Generator Block Diagram Sync Detector and Selector Sync Generator Vsync Detector, Field Separator, and Mux Phase Locked LoopSerration and Equalization Lockout Adjustment Counters Information Description Serial Communication System Controller Board Raster Timing Generator I/OInputs Description Outputs Description Vertical Deflection Board Video Processor Board Horizontal Deflection Board P/N 102523 HDB Interlocks and Protection Vertical Oscillator 12Horizontal Deflection Board Block Diagram Horizontal Centering Horizontal Phase Locked LoopHorizontal Power Supply Output Section Flyback SwitchingGeometric Correction IIC Horizontal Sweep Failure DetectionBus Information Description Horizontal Deflection Board I/O Main Horizontal Deflection Coils Inputs Description Raster Timing Generator Inputs DescriptionVertical Deflection Board Inputs Description GND Vertical Deflection Board P/N 102521VDB Functional Description 13Vertical Deflection Board Vertical Preamps Side Pincushion and Keystone Correction Vertical AmplifiersSweep Failure Detection Top and Bottom Pincushion and Keystone Correction Horizontal Linearity Correction Rxcorr Rycorr Gxcorr Gycorr Bxcorr Correction Amplifiers Input Description General I/O Horizontal Deflection Board Inputs Description System Controller Board Output DescriptionVideo Processor Board Outputs Description Correction Coils System Power SuppliesMain Vertical Deflection Coils Interlocks and Shutdowns Functional Descriptions Video Processor Board P/N 104672 VPB Decoder 15Video Processor Board, Block Diagram Sync Strip Video/Sync MuxSG Sync Strip R Brightness and Contrast Amplifiers Gamma Correction On-Screen SwitchSwitch Logic and Video Enable RGB Sensitivity and Threshold Amplifier Dynamic Focus Amplifier ILA Bias IIC Sweepok IIC VidokIIC Beamdet Redbias Gthresh RthreshBthresh Raster Timing Generator External Video Inputs Description Video Amplifier Board Inputs DescriptionVideo Amplifier Board Outputs Description Decoder Image Light Amplifiers System Power Supply Inputs Description High Voltage Power Supply Outputs DescriptionVdfocus Hdfocus Video Amplifier Board P/N 103567 or 103774 VAB Failure Detection Video Signal Enable Circuit DC RestoreBeam Current Sense Arc Protection General I/O Output Description High Voltage Power SupplyCRTs System Controller Board P/N 104668 SCB General Functional Description CPU Expanded Memory Working and Compressed Memory DACs Correction Address Generator Overlay Address Generator Overlay Memory LED Display Buffers and Logic Overlay InterfaceRS232 Interface IR Interface Serial Interface IIC Interface Video Processor Board Output Description Video Processor Board Description Corrstrt Vertical Deflection Board Description Dot Matrix Status Display Horizontal Deflection Board IR Interface RS-232 Interface SignalsBackplane Board p/n Image Light Amplifier ILA Assembly CRT AssemblyOptical Section Relay Lens Functional Description ILA CRT Image FocusesGenerates high intensity light beam Filters infrared light Projection Lens Arc Lamp AssemblyPrism Optical Subassemblies Image Light AmplifierCold Mirror Ultraviolet Filter and Condensing Lens Functional Description Functional Descriptions Service Cover-Off Power-On Sequence Service Adjustments 1Power Interlock Switch and Main Circuit Breaker CRT Yoke Rotation Service Adjustments Vertical Size Tracking Vertical Linearity Tracking Horizontal Size Tracking ILA Bias Settings CRT Mechanical Focus Service Adjustments Service Adjustments Electronic Focus Front/Rear Jumpers Jumper Settings A R Inverted Vertical Jumpers Sensitivity/Threshold Offset 10 G2 AdjustmentG2 Setting Service Adjustments Model 330 Arc Lamp Alignment and Focus Arc Lamp Alignment and Focus Service Adjustments Axis Plate Model 340SC and 370SC Arc Lamp Alignment and Focus Model 340SC and 370SC Arc Lamp Adjustments Arc Lamp Current Adjustment Watts ± 25W Amps Normal Amps Maximum Service Adjustments Maintenance Remove/Replace Before performing any removal and replacement procedures 1Major components of the Model 330 Projector 2Major components of the Model 340SC and 370SC Projectors Ventilation Filters Projector Covers Model 330 Ignitor and Arc Lamp Assembly P/N 900611S Removal Arc Lamp Assembly J503 J504 Ignitor Assembly Input POSNEG Output Interlock Switch Fan Connector Circuit Breaker Mm Set Screw Mounting Screws Collimating Condensing Lens Adjustment To remove the system power supply see -4and -5and Figure System Power Supply Maintenance Electronics Module System and HV Power Supply left side of projector Maintenance Model 330 CRT Removal Cathode Ray Tube CRT Maintenance 10Model 340SC and 370SC CRT Assembly Model 340SC and 370SC CRT Removal Video Amplifier Board VAB To remove the CRT yoke see -9or Figure CRT Yoke High Voltage Power Supply Hvps Card Cage Printed Circuit Boards Image Light Amplifier Assembly Projection Lens 2for reference to part numbers, if necessary SCB Socket Battery Replacement 13System Controller Board Sram Chips Location Description Quantity 330 340SC 370SC Recommended Spares General Information Troubleshooting On-Screen Text Description First Set Power-On Codes Code Description Second Set Code Meaning Description Break Points Break Trap Data from the Diagnostics Menu Resetting the Projector Main Menu Main Menu Structure Cutoff Problem Possible Solution Service Operator Symptom to Manual Check Raster Edge Video image not Correct using P Incushion Squared Adjust Contrast and Brightness No response Set I/R remote dip switch settings Problem Possible Solution Service Operator Symptom to Manual Glossary of Terms CRT Hdtv ISO MTS VHS Secam Freq Vertical Glossary