ViewSonic PJ452 - LCD XGA Projector-4.9LBS Service Manual page 20

6-2 Replacing The LCD/PRISM assembly
You should not replace separately the parts of the LCD/PRISM assembly. In case of a failure in any parts of
LCD/PRISM assembly, replace the whole LCD/PRISM assembly.
6-3 Cleaning up dust from panels and optical filters
1. Preparation
Wear sunglasses to protect your eyes when you maintain the projector with its lamp on.
Please prepare cleaning tools and materials as follows. And prepare relatively clean room not to work in
additional dust, while removing operation.
(1) Swab for cleaning "Cotton stick L147"
(2) Air duster (Dust blower, spray can)
(3) Vacuum cleaner
2. Disassemble and open the maintenance hole.
(1) Turn off the projector, and unplug the power cord.
(2) Remove the top cover, according to the notice 1 of chapter 8.
(3) Remove the PWB assembly MAIN, according to the notice-2 of the chapter 8.
(4) Remove the Panel Cover.
Remove Panel Cover
(5) Attach the PWB assembly MAIN in original place, and connect cables indicated above. Note that flexi-
ble cables of LCD panels should come to the upper portion of PWB assembly MAIN, but don't con-
nect them to the connectors. Make sure that flexible cables' terminals don't touch to any other parts
during maintenance, especially when the projector is turned on.
ViewSonic Corporation
Do not disassemble the unit
becaouse replacement of separate
parts is not possible.
LCD/PRISM ASSY
WARNING
Connect cables
PWB assembly MAIN
Flexible cables of LCD panels
17
Confidential - Do Not Copy
PJ452