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HD400 and HB400 Operator ’ s Manual
6.2
Cleaning Lenses
CAUTION
Do not use polishes, or window cleaning aerosols and liquids for cleaning lenses.
Do not touch the inner surfaces, (those facing away from the workpiece), of the projection or condenser lens. The projection lens is the most critical; a finger mark on the inner surface will degrade the quality of the projected image.
Remove any accumulated dust with a photographic lens brush.
Remove any grease or finger marks with a new photographic cleaning tissue, which may be moistened with Isopropyl Alcohol if necessary.
6.3
Cleaning the Mirrors
CAUTION
The mirrors should be cleaned as infrequently as possible. It is recommended that cleaning is performed by service engineers.
Do not touch the surface of the mirrors.
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