Canon LV-7105 Service Manual - Page 51

Part 2: Repair Information 6. CLEANING WARNING 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. 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. CAUTION 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. 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. 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. 2-17