Hughes Jvc 220 Projector Service Manual

  Chapter 1---Introduction 
1.0  Introduction 
This Service Manual is designed to be used with the Model 220 
User’s Guide. This service manual provides information on the: 
—  Projector functional description; 
—  Service adjustments, removal and replacement of 
subassemblies; and 
—  Troubleshooting. 
The user’s guide covers the projector’s installation, operation, 
setup adjustments, and specifications.  Together the service 
manual and user’s guide provide a qualified service person with 
information...

Chapter 1---Introduction 
Balldriver, 8mm 
Ballpoint L-Wrench Set, 1.5-5mm 
Delrin .100 Hex Alignment Tool 
Gloves, ANSI/ASTM 10,000 volt rated, Safety 
Goggles, Safety, x3(covers on) and x5(covers off) 
Hex Ballpoint Driver, 3mm 
Hex Ballpoint Driver, 5mm 
Nutdriver, 10mm 
Nutdriver, 11mm (or 7/16”) 
Nutdriver, 5mm 
Nutdriver, 7mm 
Nutdriver, 8mm 
Screwdriver, Phillips, #1 
Screwdriver, Phillips, #2 
Screwdriver, Pozidrive, #1 
Screwdriver, Pozidrive, #2 
Screwdriver, Slot ¼” 
Screwdriver, Slot, ½”...

  Chapter 1---Introduction 
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 
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...

Chapter 1---Introduction 
1-4  Model 220 Service Manual 
  

Chapter 2---System Description 
2.0   System Description 
  Contents 
2.1   Introduction........................................................................\
......2-1 
2.2   Optical System........................................................................\
.2-2 
2.2.1   Image Path...................................................................2-2 
2.2.2   Arc Lamp Light Path....................................................2-4 
2.3   Electronics...

Chapter 2---System Description 
• The Power Supply Section is located at the right front area of 
the projector below and to the rear of the Arc Lamp. It contains 
the Low Voltage Power Supply, the High Voltage Power 
Supply, and the Arc Lamp Power Supply. 
• The Projector Electronics Section is located mainly in the 
back half of the projector. It consists of the Electronics Module 
that houses 6 of the electronics printed circuit boards used in 
the projector, and their associated cabling. It also...

Chapter 2---System Description 
image and to control the amount of modulation the ILA® 
assemblies introduce on the light coming from the Arc Lamp. The 
Red, Green, and Blue image signals are routed to the CRTs from 
the Video Amplifier Board through the CRT socket connectors. 
Relay Lens: The relay lens picks up the image from the face of 
the CRT and focuses the image to the ILA® assembly. 
Image Light Amplifier (ILA®) Assembly: The CRT image is 
received from the relay lens onto the input side of the...

Chapter 2---System Description 
Combining (4P) Prism: The combining prism consists of 
separate prisms that polarize each of the three high intensity 
signals and direct them toward the projection lens. 
Projection Lens: The Projection Lens picks up the high intensity 
image from the Combining Prism and transmits it to the projector 
screen. 
2.2.2   Arc Lamp Light Path 
The Arc Lamp assembly produces the high intensity light used to 
transmit bright images to the screen. It consists of a Xenon Arc 
Lamp...

Chapter 2---System Description 
The high intensity light beam then proceeds toward the Dichroic 
Mirror Assembly. Thus, most of the IR and UV light is filtered out 
before the light beam enters the more sensitive portions of the 
optics, leaving only the visible portion. 
Dichroic Mirror Assembly: The condensed and filtered white 
light beam enters the Dichroic Mirror Assembly which separates 
(dichroic mirrors reflect only one color and pass all others) the 
light into its Red, Green and Blue...

Chapter 2---System
 Description 
Figure 2-1.  Optical Sy
stem Block Diagram
 
2-6
 
 
Model 220 Service Manual