Manuals / JVC / Computer Equipment / Projector

JVC 370 SC, 330, 340 SC service manual Acronyms Used In Manual

Models: 340 SC 370 SC 330

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Chapter 1---Introduction

1.0 Introduction

This Model 330, 340SC and 370SC Service Manual combines three (3) similar projector models into one (1) reference book, and should be used in conjunction with the appropriate projector Operator’s Manual. This manual provides more detailed information on troubleshooting and maintaining the projectors and a more in-depth functional description of the system subassemblies than the specific Operator’s Manual, which cover the specific projector system description, installation, adjustments, operation, maintenance, specifications, troubleshooting guide, and parts list.

The areas covered in this Service Manual include any similarities and differences of functional descriptions of Model 330, 340SC and 370SC projector electronics, service adjustments, maintenance (removal and replacement of subassemblies), and troubleshooting.

1.1 Acronyms Used In Manual

ALPS	Arc Lamp Power Supply
CH	Channel
CPU	Central Processing Unit
CRT	Cathode Ray Tube
DSP	Digital Signal Processor
EPROM	Erasable Programmable Read-Only Memory
F to V	Frequency to Voltage
G2	CRT Grid 2
HDB	Horizontal Deflection Board
HDTV	High Definition Television
HSYNC	Horizontal Sync
HVPS	High Voltage Power Supply
ILA®	Image Light Amplifier
I/O	Input/Output
I/R	Infrared
kHz	Kilohertz
LED	Light Emitting Diode
LVPS	Low Voltage Power Supply
NTSC	National Television Standards Committee
PCB	Printed Circuit Board
PLL	Phase Lock Loop
PLUGE	Picture Line-Up Generating Equipment
RAM	Random Access Memory
RGB	Red, Green and Blue
ROM	Read Only Memory

Model 330, 340SC and 370SC Service Manual

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JVC 370 SC, 330, 340 SC service manual Acronyms Used In Manual

Contents

Model Model 340 SC Model 370 SC Hughes-JVC Technology CorporationManufacturer Hughes-JVC Technology Corporation Confidential and proprietary informationSafety Equipment IntroductionInstallation Safeguards Projector WeightFans Heat SafeguardsLight Safeguards Ultra Violet and Infrared LightViii Power Supply Fluid SafeguardsVentilation and Foreign Object Retrieval Safety Safety Acronyms Used In Manual Updates SafetyHardware Compatibility Software Graphics enhancement Memories Decoder board option Contents Functional Descriptions1Model 330, 340SC and 370SC System Block Diagrams Cover and BaseExternal Power Requirements Electronics Systems OverviewFunctional Descriptions System Power System Power SupplySTB STB AC Input CRT SCB HDB VDB VPB RTG VAB 4System Power Supply Input/Output Diagram Arc Lamp Ignitor22-30V depending on projector model High Voltage Power Supply High Voltage Power Supply Functional Descriptions Card Cage Circuit Boards 104668 Backplane Board 100571Functional Descriptions 10Raster Generation Block Diagram 11Raster Timing Generator Block Diagram Raster Timing Generator Board RTG p/nSync Generator Sync Detector and SelectorSerration and Equalization Lockout Phase Locked LoopVsync Detector, Field Separator, and Mux Adjustment Counters Serial Communication Information DescriptionInputs Description Raster Timing Generator I/OSystem Controller Board Outputs DescriptionVideo Processor Board Vertical Deflection BoardInterlocks and Protection Horizontal Deflection Board P/N 102523 HDB12Horizontal Deflection Board Block Diagram Vertical OscillatorHorizontal Power Supply Horizontal Phase Locked LoopHorizontal Centering Geometric Correction Flyback SwitchingOutput Section Bus Information Description Horizontal Sweep Failure DetectionIIC Horizontal Deflection Board I/O Vertical Deflection Board Inputs Description Raster Timing Generator Inputs DescriptionMain Horizontal Deflection Coils Inputs Description Vertical Deflection Board P/N 102521VDB GNDFunctional Description Vertical Preamps 13Vertical Deflection BoardSweep Failure Detection Vertical AmplifiersSide Pincushion and Keystone Correction Horizontal Linearity Correction Top and Bottom Pincushion and Keystone CorrectionCorrection Amplifiers Rxcorr Rycorr Gxcorr Gycorr BxcorrGeneral I/O Input DescriptionVideo Processor Board Outputs Description System Controller Board Output DescriptionHorizontal Deflection Board Inputs Description Main Vertical Deflection Coils System Power SuppliesCorrection Coils Interlocks and Shutdowns Functional Descriptions Video Processor Board P/N 104672 VPB 15Video Processor Board, Block Diagram DecoderSG Sync Strip Video/Sync MuxSync Strip R Brightness and Contrast AmplifiersSwitch Logic and Video Enable On-Screen SwitchGamma Correction RGB Sensitivity and Threshold Amplifier ILA Bias Dynamic Focus AmplifierIIC Beamdet IIC VidokIIC Sweepok RedbiasBthresh RthreshGthresh Raster Timing GeneratorVideo Amplifier Board Outputs Description Video Amplifier Board Inputs DescriptionExternal Video Inputs Description Image Light Amplifiers DecoderVdfocus High Voltage Power Supply Outputs DescriptionSystem Power Supply Inputs Description HdfocusVideo Amplifier Board P/N 103567 or 103774 VAB Video Signal Failure DetectionBeam Current Sense DC RestoreEnable Circuit Arc ProtectionGeneral I/O CRTs High Voltage Power SupplyOutput Description System Controller Board P/N 104668 SCB General Functional Description CPU Working and Compressed Memory Expanded MemoryCorrection Address Generator DACsOverlay Memory Overlay Address GeneratorRS232 Interface Overlay InterfaceLED Display Buffers and Logic IR InterfaceIIC Interface Serial InterfaceVideo Processor Board Description Video Processor Board Output DescriptionCorrstrt Vertical Deflection Board Description Horizontal Deflection Board Dot Matrix Status DisplayBackplane Board p/n RS-232 Interface SignalsIR Interface Optical Section CRT AssemblyImage Light Amplifier ILA Assembly Relay LensFunctional Description Generates high intensity light beam CRT Image FocusesILA Filters infrared lightPrism Arc Lamp AssemblyProjection Lens Cold Mirror Image Light AmplifierOptical Subassemblies Ultraviolet Filter and Condensing LensFunctional Description Functional Descriptions Service Adjustments Service Cover-Off Power-On Sequence1Power 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 Jumper Settings Front/Rear JumpersA R Inverted Vertical Jumpers G2 Setting 10 G2 AdjustmentSensitivity/Threshold Offset Service Adjustments Arc Lamp Alignment and Focus Model 330 Arc Lamp Alignment and FocusService Adjustments Model 340SC and 370SC Arc Lamp Alignment and Focus Axis PlateArc Lamp Current Adjustment Model 340SC and 370SC Arc Lamp AdjustmentsWatts ± 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 Projector Covers Ventilation FiltersArc Lamp Assembly Model 330 Ignitor and Arc Lamp Assembly P/N 900611S RemovalJ503 J504 Ignitor Assembly NEG POSInput OutputInterlock Switch Fan Connector Circuit Breaker Collimating Condensing Lens Adjustment Mm Set Screw Mounting ScrewsSystem Power Supply To remove the system power supply see -4and -5and FigureMaintenance System and HV Power Supply left side of projector Electronics ModuleMaintenance Cathode Ray Tube CRT Model 330 CRT RemovalMaintenance 10Model 340SC and 370SC CRT Assembly Video Amplifier Board VAB Model 340SC and 370SC CRT RemovalCRT Yoke To remove the CRT yoke see -9or FigureHigh 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 Recommended Spares Description Quantity 330 340SC 370SCTroubleshooting General InformationOn-Screen Text Description Power-On Codes First SetSecond Set Code DescriptionBreak Points Code Meaning DescriptionResetting the Projector Break Trap Data from the Diagnostics MenuMain Menu Structure Main MenuProblem Possible Solution Service Operator Symptom to Manual CutoffCheck 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