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Hughes JVC Projector 250 Sc Service Manual

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Page 1

SERVICE
MANUAL
Model 250 Projector
Phone: (760) 929-5300
Fax: (760) 929-5410
2310 Camino Vida Roble
Carlsbad, California 92009 

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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,...

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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...

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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...

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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...

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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...

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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 

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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...

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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...

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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...
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