JVC 250 service manual Cleaning Lenses, ILA Assemblies and Mirrors

Chapter 6---Miscellaneous Items

The EMI Shield is a metal plate located in front of the Low Voltage Power Supply and the Arc Lamp Power Supply. It must be removed before removing either of these power supplies. Be sure to replace the EMI Shield after replacing either the Low Voltage Power Supply or the Low Voltage Power Supply.

6.7Cleaning Lenses, ILA® Assemblies and Mirrors

The projection lens is the only item that requires periodic cleaning. Other assemblies are covered to prevent dust entering or finger smudging. Cleaning may be needed for special circumstances such as replacing an assembly. Cleaning should only require removing excessive dust (use canned air such as “Office Duster” or "Aero Duster") or removing fingerprint smudges (use “Kodak Lens paper”, or equivalent) from the projection lens. As much as possible, clean the optics only when absolutely necessary.

Projection Lens - Use lens paper and wipe the lens clean in a vertical motion from top to bottom. Use compressed air to blow excess dust from the lens. An optical lens cleaning solution can also be used to remove finger smudges.

ILA® Assembly - Clean the ILA® assembly faces with compressed air only. Do not wipe the ILA assembly faces.

CRT Faces - Use compressed air to blow dust off and lens paper to clean face.

Relay Lens - Same as Projection Lens.

Mirrors and Polarizing Beam Splitter Windows - The Optical Shields cover the Dichroic Mirror Assembly and Polarizing Beam Splitter windows. Normally cleaning is not needed. Clean only if absolutely necessary using compressed air. Do not wipe mirrors.

Model 250 Service Manual 6-5