Cleaning The Optical Parts - Sanyo PDG-DHT8000L Service Manual

Maintenance

Cleaning the Optical Parts

After long periods of use, dust and other particles will accumulate on the optical parts, DMD module, mirror, color
wheel, 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. Before taking the cleaning, turn off the projector and allow the projector to cool for more than 45
minutes.
cleaning with air spray
Remove the cabinet top following to "Mechanical Disassembly". Clean up the optical parts, color wheel, lens by using
the air spray from the cabinet top opening.
caution:
The optical components may have a crack or spot when you use the air spray directly to the optical components
while they are in the state of hot. 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 suffi-
ciently cleaned by air spraying alone.
Be sure to readjust the optical system after performing disassembly cleaning.
Remove the mechanical parts following to "Mechanical Disassembly". 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.
cleaning the color Wheel
- The color wheel is made of thin glass. Be very careful when handing the color wheel.
- In case of fingerprints, etc. on the surface, gently wipe with a Cleaning Cloth for optical parts that contains a small
amount of non-abrasive camera lens cleaner to clean the surface.
- Do not use detergents as this could cause peeling of the color filter.
cleaning the dMd / Prism
- The Prism and DMD surface are glasses and can be cleaned. However, avoid scratches as these can have a direct
influence on the image.
1. Use a commercial (inert gas) air spray designed for cleaning camera and computer equipment to clean the sur-
face. If this does not remove, take next step.
2. Gently wipe the surface with a Cleaning Cloth for optical parts in one direction. Always use a new section of
the Cleaning Cloth. Using the same section of the Cloth has the potential of dragging particles and or adding
contaminant to the glass surface which may scratch the glass.
- Do not use absolute alcohol or other substances that could leave streaks after drying.
cleaning the reflecting Mirror
- Be careful not to touch the reflecting mirror. Touching it directly with the hands may cause reducing the burnish-
ing.
- Do not clean other than with air.
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