Canon D78-5532, Service Manual, Page: 40 / 119

5. CLEANING
Cleaning with air spray
1. Remove the cabinet top following to “Mechanical Disassemblies”.
2. Clean up the LCD panel and polarizing plate by using the air spray from the cabinet
top opening.
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 units following to “Mechanical Disassemblies”.
2. Remove the optical base top following to “Optical Unit Disassemblies”. If the LCD
panel needs cleaning, remove the LCD panel unit following 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
2-14
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