Canon LV-7545U, Service Manual

Page: 43 / 130

6. CLEANING
Cleaning with air spray
1. Remove the cabinet top according to "Service Mechanical Disassemblies".
2. Clean up the LCD panel and polarizing plate by using the air spray.
Disassembly cleaning
Disassembly cleaning method should only be performed when the unit is considerable
dirty and cannot be sufficiently cleaned by air spraying alone. Be sure to readjust the
optical system after performing disassembly cleaning.
1. Remove the cabinet top and main board according to "Service Mechanical
Disassemblies".
2. Remove the integrator lens ass'y and optical base top according to "Optical Unit
Disassemblies". If the LCD panel needs cleaning, remove the LCD panel unit
according to "LCD panel replacement".
3. Clean the optical parts with a soft cloth. Clean extremely dirty areas using a cloth
moistened with alcohol.
Part 2: Repair Information
2-18
After long periods of use, dust and other particles will accumulate on the
LCD panel, prism, mirror, polarized glass, lens, etc., causing the picture
to darken or color to blur. If this occurs, clean the inside of optical unit.
Remove dust and other particles using air spray. If dirt cannot be
removed by air spray, disassemble and clean the optical unit.
WARNING
Use a commercial (inert gas) air spray designed for cleaning camera and
computer equipment. Use a resin-based nozzle only. Be vary careful not
to damage optical parts with the nozzle tip. Never use any kind of
cleanser on the unit. Also, never use abrasive materials on the unit as
this may cause irreparable damage.
CAUTION
The surface of the optical components consists of multiple dielectric
layers with varying degrees of refraction. Never use organic solvents
(thinner, etc.) or any kind of cleanser on these components.
Since the LCD panel is equipped with an electronic circuit, never use any
liquids (water, etc.) to clean the unit. Use of liquid may cause the unit to
malfunction.
CAUTION