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Hughes JVC Projector 250 Sc Service Manual

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    							SERVICE
    MANUAL
    Model 250 Projector
    Phone: (760) 929-5300
    Fax: (760) 929-5410
    2310 Camino Vida Roble
    Carlsbad, California 92009 
    						
    							iiModel 250 Service Manual
    DECLARATION OF CONFORMITY
    PER ISO/IEC GUIDE 22 AND EN 45014
    Manufacturer
    :
    Hughes JVC
    2310 Camino Vida Roble
    Carlsbad, Ca 92009
    USA
    Hughes-JVC declares that this product conforms to the following Product
    Specifications (Directive/Standard):
    Safety: EN 60950
    IEC 950 (1992)
    EMC: EN 55022 (1988) / CISPR-22 (1986) Class A
    EN 50082-1 (1992) / IEC 801-2(1991)
    EN 50082-1 (1992) / IEC 801-3(1984)
    EN 50082-1 (1992) / IEC 801-4(1988)
    ANSI C63.4-1992, FCC, Part 15, Class A
    In addition, the above product complies with the requirements of the Low Voltage
    Directive 73/23 EEC and the EMC Directive 89/336/EEC.
    106784 First Edition May 1999
    © Copyright 1999 by Hughes-JVC Technology Corporation.
    All worldwide rights reserved.
    This manual was produced by Hughes-JVC Technology Corporation and may be revised
    without prior notice.
    No part of this manual may be reproduced in any form without the express written
    permission of Hughes-JVC Technology Corporation.
    ILA
    ® is a registered trademark of Hughes-JVC Technology Corporation. 
    						
    							Model 250 Projector Service Manual iii
    Table of Contents
    Safety Information.................................................................................... v
    Chapter 1  Introduction
    1.1  Safety...................................................................................................... 1-1
    1.2  Updates ................................................................................................... 1-2
    1.3  Acronyms ............................................................................................... 1-2
    Chapter 2  System Description
    2.1  Introduction ............................................................................................ 2-1
    2.2  Electrical Section.................................................................................... 2-2
    2.3  Optical Section ....................................................................................... 2-3
    2.4  Electronic Section .................................................................................. 2-5
    2.5  Miscellaneous Items ............................................................................... 2-7
    Chapter 3  Electrical
    3.1  Safety...................................................................................................... 3-1
    3.2  Incoming Power Circuit ......................................................................... 3-2
    3.3  Power Supplies ....................................................................................... 3-3
    3.4  Igniter Assembly .................................................................................... -15
    Chapter 4  Optical
    4.1  Arc Lamp................................................................................................ 4-2
    4.2  Optical Path ............................................................................................ 4-7
    4.3  ILA
    ®....................................................................................................... 4-12
    4.4  Relay Lenses........................................................................................... 4-19
    4.5  Projection Lens ....................................................................................... 4-19
    Chapter 5  Electronic
    5.1  Safety...................................................................................................... 5-1
    5.2  Introduction ............................................................................................ 5-2
    5.3  System Controller PCB .......................................................................... 5-3
    5.4  Video Processor PCB ............................................................................. 5-11
    5.5  Raster Timing Generator PCB ............................................................... 5-16
    5.6  Horizontal Vertical Deflection PCB ...................................................... 5-21
    5.7  Convergence Deflection PCB ................................................................ 5-28
    5.8  Scan Reversal PCB................................................................................. 5-34
    5.9  Video Amplifier PCB ............................................................................. 5-43
    5.10 CRT/Yoke Assemblies .......................................................................... 5-51
    5.11 VICs ...................................................................................................... 5-58
    5.12 Backplane .............................................................................................. 5-74
    Chapter 6  Miscellaneous Items
    6.1  Projector Covers ..................................................................................... 6-1
    6.2  Electronics Module Tilt-up .................................................................... 6-2
    6.3  Ventilation .............................................................................................. 6-3
    6.4  Air Filters ............................................................................................... 6-4 
    						
    							ivModel 250 Service Manual
    6.5  IR Detectors............................................................................................ 6-4
    6.6  EMI Shield ............................................................................................. 6-4
    6.7  Cleaning Lenses, ILA
    ® Assemblies, and Mirrors................................... 6-5
    Chapter 7 Troubleshooting
    7.1  Safety...................................................................................................... 7-1
    7.2  LEDs....................................................................................................... 7-2
    7.3  Diagrams ................................................................................................ 7-12
    7.4  Error Codes ............................................................................................ 7-22
    7.5  Troubleshooting Guide........................................................................... 7-25
    Chapter 8 Software and Protocol
    8.1  Software Updating.................................................................................. 8-1
    8.2  Importing/Exporting ............................................................................... 8-5
    8.3  Terminals and Communication Protocol................................................ 8-10
    Chapter 9 Parts
    9.1  Replacement Parts List ........................................................................... 9-1
    9.2  Recommended Spares ............................................................................ 9-3
    Glossary......................................................................................................... A-1 
    						
    							Chapter 1---Introduction
    Model 250 Service Manual 1-1
    1.0 Introductio n
    Contents
    1.1  Safety............................................................................................................ 1-1
    1.2  Updates ......................................................................................................... 1-2
    1.3  Acronyms Used ............................................................................................ 1-2
    The Model 250 Service Manual will provide information on how the each of the
    different components function individually and how they work together to take a
    source input image and project that image onto the screen.  It will provide a list of
    the tools and procedures needed to perform necessary adjustments and to remove
    and replace components. The tools needed to perform any task are included in the
    procedure. The Model 250 Service Manual will provide diagrams and test points
    to help in diagnosing and troubleshooting. It will provide illustrations to show
    location and proper configuration of major and minor components. This manual
    will assist the Hughes-JVC Certified Technician with information to properly
    maintain and when necessary, troubleshoot the Model 250 projector. Use the
    Model 250 Service Manual in conjunction with the Model 250 User’s Guide.
    The User’s Guide covers
    ! Installation,
    ! Operation,
    ! Setup Adjustments
    ! Specifications
    This Service Manual covers:
    ! Projector functional description
    ! Service adjustments
    ! Removal and replacement of subassemblies
    ! Troubleshooting
    Together, the Service Manual and User’s Guide provide a qualified service person
    with information to properly operate and maintain the projector.
    1.1 Safety
    This projector contains high voltages in the power supplies and around the CRTs
    and high intensity light sources in and around the Arc Lamp and optical path.
    Read the entire Safety Chapter at the front of this manual before performing any
    adjustments or maintenance. 
    						
    							Chapter 1---Introduction
    1-2 Model 250 Service Manual
    When performing procedures that call for the projector’s power to be on, always
    wear high voltage gloves (ANSI/ASTM 10,000 volt rated) when working around
    the CRTs, Arc Lamp or power supplies. Wear safety goggles (rated X5) when
    working near the light path from the Arc Lamp or at all times around the
    projection lens.
    1.2 Updates
    Hughes-JVC will periodically provide bulletins and /or manual supplements to
    ensure the continued accuracy of this service manual.
    1.3 Acronyms Used
    ALPS  Arc Lamp Power Supply
    C Chrominance
    CDB Convergence/Deflection Board
    CH Channel
    CPU Central Processing Unit
    CRT Cathode Ray Tube
    EMI Electromagnetic Interference
    EPROM Erasable Programmable Read-Only Memory
    FPGA Field Programmable Gate Array
    F to V Frequency to Voltage
    G1 CRT Grid 1
    G2 CRT Grid 2
    HVDB Horizontal/Vertical Deflection Board
    Hz Hertz
    HSYNC Horizontal Sync
    HVDB Horizontal/Vertical Deflection Board
    HVPS High Voltage Power Supply
    IIC Inter-Integrated Circuit
    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
    PAL Phase Alternating Line
    PCB Printed Circuit Board
    PLL Phase Lock Loop
    PLUGE Picture Line-Up Generating Equipment
    RAM Random Access Memory
    RGB Red, Green and Blue
    RGBHV Red, Green, Blue, Horizontal, Vertical
    ROM Read Only Memory
    RTG Raster Timing Generator
    SCB System Controller Board 
    						
    							Chapter 1---Introduction
    Model 250 Service Manual 1-3
    SECAM Sequential couleur a memoire (sequencial 
    color with memory
    SRB Scan Reversal Board
    SYNC Synchronization
    TTL Transistor-Transistor Logic
    UL Underwriter Laboratories
    UV Ultraviolet
    VAB Video Amplifier Board
    VCO Voltage Controlled Oscillator
    VIC Video Input Card
    VIN Video Input
    VPB Video Processor Board
    VSYNC Vertical Sync
    VTR Video Tape Recorder
    Y Luminance 
    						
    							Chapter 2---System Description
    Model 250 Service Manual 2-1
    2.0  System De s cription
    Contents
    2.1  Introduction .................................................................................................. 2-1
    2.2  Electrical Section.......................................................................................... 2-2
    Incoming Power Circuit ............................................................................. 2-2
    Power Supplies ........................................................................................... 2-2
    Igniter Assembly ........................................................................................ 2-3
    2.3  Optical Section ............................................................................................. 2-3
    Arc Lamp Module ...................................................................................... 2-3
    Optical Path ................................................................................................ 2-3
    ILA
    ®s.......................................................................................................... 2-4
    CRTs .......................................................................................................... 2-4
    Relay Lenses .............................................................................................. 2-5
    Projection Lens........................................................................................... 2-5
    2.4  Electronic Section ........................................................................................ 2-5
    VICs ........................................................................................................... 2-5
    PCBs ........................................................................................................... 2-6
    CRT/Yoke Assemblies ............................................................................... 2-7
    2.5  Miscellaneous Items ..................................................................................... 2-7
    Projector Covers ......................................................................................... 2-7
    IR Detectors................................................................................................ 2-7
    Cooling Fans .............................................................................................. 2-7
    Air Filters ................................................................................................... 2-7
    EMI Shield ................................................................................................. 2-8
    2.1 Introduction
    This chapter is divided into four basic sections: the Electrical Section, the Optical
    Section, the Electronic Section and the Miscellaneous Items. Each section gives a
    basic description of the components in the section and a description of the
    function of those components. This provides an overall view of the projector and
    its subsystems for a general understanding of how these systems contribute to the
    function of the projector. 
    						
    							Chapter 2---System Description
    2-2 Model 250 Service Manual
    Figure 2-1  
    Overview of the Model 250 projector showing major components
    2.2 Electrical Section
    The electrical section consists of the Incoming Power Circuit, and the Power
    Supplies and the Igniter Assembly. The following paragraphs give a list of major
    components and a brief description of those components. For a more detailed
    description of a component, refer to the chapter and section dedicated to that
    particular component.
    Incoming Power Circuit
    ! Power Cord - The AC power comes in through the Power Cord to the AC
    Circuit Breaker.
    ! AC Circuit Breaker - The Circuit Breaker connects and disconnects the
    projector from electrical energy and protects the projector from over-
    voltage conditions.
    ! AC Line Filter - The AC SF Series Line Filter reduces radiation generated
    by a regulated power supply from returning to the AC power source.
    Power Supplies
    ! Low Voltage Power Supply (LVPS) - The LVPS supplies standby
    voltages and the main system voltages to the projector.
    ! Arc Lamp Power Supply (ALPS) - The ALPS supplies power to the
    Igniter Assembly while the Arc Lamp is lighting. After the Arc Lamp has
    lit, ALPS provides the steady state power to the Arc Lamp. The ALPS
    also monitors the condition of the Arc Lamp and sends a feedback signal
    to the System Controller PCB if there is a problem.
    ! High Voltage Power Supply (HVPS) - The HVPS provides the Anode,
    Focus (G3), Black Level (G2), Blanking (G1), and Dynamic Focus voltages
    for the CRT. 
    						
    							Chapter 2---System Description
    Model 250 Service Manual 2-3
    Igniter Assembly
    The Igniter Assembly provides the high voltage pulse that lights the Arc Lamp
    and acts as a link from the Arc Lamp Power Supply to the Arc Lamp after the Arc
    Lamp has been lit.
    ! Igniter - The Igniter actually performs three functions. It is a step-up
    transformer that supplies the high voltage pulse to light the Arc Lamp. It
    also supplies the spark gap for the high voltage pulse. Once the Arc Lamp
    is lit, the Igniter acts as a link between the Arc Lamp Power Supply and
    the Arc Lamp for steady state operation.
    ! Laser Power Supply - The Laser Power Supply provides the voltage for
    the spark gap. The spark gap produces a high voltage pulse in the Igniter
    that lights the Arc Lamp.
    2.3 Optical Section
    The optical section of the Model 250 consists of the Arc Lamp Module, the
    Optical Path, the ILA®, the CRTs, the Relay Lenses and the Projection Lens.
    Arc Lamp Module
    The Arc Lamp Module supplies high intensity light for the Model 250. Its output
    is rated at 2 kW. The Arc Lamp has an expected 50% lifetime (half of initial light
    output) of 1000 hours.
    Optical Path
    The Optical Path consists of all the optical components that transmit, filter,
    separate, bend, or straighten the Arc Lamp light. The Optical Path also includes
    Polarizing Prisms, Prepolarizing Prisms, Steering Prisms and the 4P Combining
    Prism that control the image path inside the Prism Assembly.
    ! Cold Mirrors (3) - The Cold Mirrors remove infrared light rays, which
    contain most of the heat, from the white light coming from the Arc Lamp.
    There are three Cold Mirrors, the first one is located in front of the Arc
    Lamp, and the other two are located after the Light Pipe.
      CAUTION!  The term cold mirror is used because
    the mirror passes infrared light and its reflection contains only cold
    light that does not transmit appreciable heat. As a result of the
    absorption of infrared heat radiation, cold mirrors get very hot
    .
    ! Light Pipe - The Light Pipe acts as an Integrator to spread out the beam of
    light creating a uniform distribution of light across the face of the ILA®.
    This will result in a more uniform image on the screen 
    						
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