Sanyo PLV-55WHD1 Service Manual page 11

● Optical parts care and cleaning
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 inside of the optical unit.
Remove dust or other particles using air spray. If dirt cannot be removed by air spray, disassemble and clean the opti-
cal unit.
Caution:
Use a commercial (inert gas) air spray designed for cleaning camera and computer equipment.
Use a resin-based nozzle only. Be very 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 sufficient-
ly cleaned by air spraying alone.
Be sure to readjust the optical system after performing disassembly cleaning.
Cleaning Procedure
(When no good, progress to next step.)
1. Clean surface of optical parts using air spray.
2. Wipe the dry cleaning with wiping cloth and the wiper.
3. Soak a few medicines in the cloth as follows and wipe up them lightly. After that, always wipe the dry cleaning
cloth.
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 liquid (water,etc.) to clean the unit.
Use of liquid may cause the unit to malfunction.
Screen handling precaution;
1. Wear gloves when handling the screen to prevent fingerprints (also, protection of hand).
2. Do not use force when handling the screen so that edges will not brake or crack.
3. Be careful in handling at the process of disassemblies, because scratch or scrub wound makes transparency
decrease easily.
4. Keep the screen in a dust free environment, because dust may accumurate on the screen by static electricity.
5. Do not stand a screen obliquely for long time.
6. Use thinned synthetic detergent for cleaning, because of the weakness against solvent. Wipe gently with soft
cloth.
7. The screen has laminated Lenticular lens and the Fresnel lens. As scrubbed wound on lens is occured by vibra-
tion, so avoid too much vibration after lamination of Lenticular lens and Fresnel lens.
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Cleaning