Hughes JVC Projector 250 Sc Service Manual

Chapter 5---Electronics
5-76 Model 250 Service Manual
Figure 5-44  
Backplane Diagram (right side). 

Chapter 5---Electronics
Model 250 Service Manual 5-77 

Chapter 6---Miscellaneous Items
Model 250 Service Manual 6-1
6.0 Miscellaneous Items
Contents
6.1  Projector Covers ........................................................................................... 6-1
6.2  Electronics Module Tilt-up .......................................................................... 6-2
6.3  Ventilation .................................................................................................... 6-3
6.4  Air Filters...

Chapter 6---Miscellaneous Items
6-2 Model 250 Service Manual
5. When the Latch Levers are inserted into the holding slots, lift the cover
off. Be careful not to brush against any of the internal components of the
projector when removing the cover. If any undue resistance is felt, stop to
locate the source before proceeding.
6. Replace the covers in reverse order. When replacing either cover, make
sure the slot in the cover fits over the bottom of the projector case or the
cover will not close correctly....

Chapter 6---Miscellaneous Items
Model 250 Service Manual 6-3
Figure 6-1  
Electronics Module hinge and locking mechanism.
6.3 Ventilation
Adequate cooling is a major consideration for the Model 250 projector. There are
thirteen cooling fans (including the Arc Lamp blower) in this projector.
!
 4 fans in the main chassis - two in the rear of the projector, one in the right
front corner and one on the bottom of the projector. These fans bring cool
air into the chassis of the projector. Each of these fans...

Chapter 6---Miscellaneous Items
6-4 Model 250 Service Manual
6.4 Air Filters
There are three polyurethane air filters in the Model 250. Air filters should be
cleaned whenever necessary. In extremely dusty or dirty conditions, the filters
should be cleaned more frequently. Remove the filters and vacuum them or blow
them clean with compressed air.
The air filters just slide out. No tools are required to remove and reinstall any of
the air filters. They are located as follows:
!
 1 metal-framed filter in...

Chapter 6---Miscellaneous Items
Model 250 Service Manual 6-5
The EMI Shield is a metal plate located in front of the Low Voltage Power
Supply and the Arc Lamp Power Supply. It must be removed before removing
either of these power supplies. Be sure to replace the EMI Shield after replacing
either the Low Voltage Power Supply or the Low Voltage Power Supply.
6.7  Cleaning Lenses, ILA® Assemblies and Mirrors
The projection lens is the only item that requires periodic cleaning. Other
assemblies are covered...

Chapter 6---Miscellaneous Items
6-6 Model 250 Service Manual 

Chapter 7---Troubleshooting
Model 250 Service Manual 7-1
7.0 Troubleshooting
Contents
7.1  Safety............................................................................................................ 7-1
7.2  LEDs............................................................................................................. 7-2
Backpanel LEDs......................................................................................... 7-2
Video Processor PCB...

Chapter 7---Troubleshooting
7-2 
Model 250 Service Manual
Left/Right Orientation: When referring to the left or right in this chapter, it is
with reference to standing at the rear of the projector, facing the screen
.
Connectors
 on subassemblies and PCBs have tabs that must be released first
before pulling on the connector. The proper procedure is to push slightly 
IN on
the connector, then squeeze the tab, then pull the connector out.
7.2 LEDs
Backpanel LEDs
This section covers the various terminals,...