Arc Lamp Assembly | JVC 340 SC, 330, 370 SC guide

Chapter 4—Maintenance

NOTE: This filter can also be removed, while leaving the rear cover in place, by removing the two screws at the top of the side panel where the filter is located. Slide the panel up and out.

4.4 Arc Lamp Assembly

The Arc Lamp Assembly, which includes the Ignitor, is located in the middle section of the projector. Separate instructions for both the Model 330 and the Model 340SC and 370SC arc lamp assembly removal follow.

WARNING!!! High Voltage points of up to 40,000 volts are exposed inside the projector covers. It takes at least a minute to bleed off high voltage even after the unit has been turned off.

Model 330 Ignitor and Arc Lamp Assembly (P/N 900611S) Removal

To remove the Ignitor Assembly or Xenon Arc Lamp from a Model 330 Projector:

Refer to Photo 4-1 for right and left orientation and to perform the following procedure. Label any connectors prior to removing to ensure they are reconnected correctly.

1.Unplug the projector.

2.Remove the front and rear projector covers (see Section 4.2).

3.Disconnect and label the four (4) high voltage cables that are connected to the Ignitor.

NOTE: If the small, black wire on J503 (where the black negative cable connects from the Ignitor to the System Power Supply) is disconnected in order to remove the Ignitor negative cable, be sure to reconnect it when reinstalling the Ignitor. This wire carries the boost voltage that keys the Ignitor on.

CAUTION! Do not disconnect the cable from the arc lamp end! If returning the arc lamp, leave both cables attached to avoid misaligning the Arc Lamp interior components.

4.Remove the three (3) ground straps from the Ignitor and Arc Lamp. Leave them connected to the projector.

4-6	Model 330. 340SC, 370SC Service Manual

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JVC 340 SC, 370 SC service manual Model 330 Ignitor and Arc Lamp Assembly P/N 900611S Removal

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 Ultra Violet and Infrared Light Heat SafeguardsLight Safeguards Fans 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 Outputs Description Raster Timing Generator I/OSystem Controller Board Inputs 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 R Brightness and Contrast Amplifiers Video/Sync MuxSync Strip SG Sync Strip Gamma Correction On-Screen SwitchSwitch Logic and Video Enable RGB Sensitivity and Threshold Amplifier Dynamic Focus Amplifier ILA Bias Redbias IIC VidokIIC Sweepok IIC Beamdet Raster Timing Generator RthreshGthresh Bthresh External Video Inputs Description Video Amplifier Board Inputs DescriptionVideo Amplifier Board Outputs Description Decoder Image Light Amplifiers Hdfocus High Voltage Power Supply Outputs DescriptionSystem Power Supply Inputs Description Vdfocus Video Amplifier Board P/N 103567 or 103774 VAB Failure Detection Video Signal Arc Protection DC RestoreEnable Circuit Beam Current Sense 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 IR Interface Overlay InterfaceLED Display Buffers and Logic RS232 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 Relay Lens CRT AssemblyImage Light Amplifier ILA Assembly Optical Section Functional Description Filters infrared light CRT Image FocusesILA Generates high intensity light beam Projection Lens Arc Lamp AssemblyPrism Ultraviolet Filter and Condensing Lens Image Light AmplifierOptical Subassemblies Cold Mirror 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 Output POSInput NEG 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