6.0 MAINTENANCE
6 . 1 Cleaning the screen lenses and mirror
Lenses:
Any accumulated dust must be removed from the surface of the
lenses with a photographic lens brush.
The surface of the inner lens (projection or condenser) must not be
touched. The element of the projection lens facing the mirror is most
critical in this respect. A single finger mark on this surface will noticeably
degrade the quality of the projected image. It should be noted that the
projection lens element facing the work piece is far less critical in this
respect.
Any grease or finger marks may be removed with a new photographic
cleaning tissue. If necessary, the tissue may be moistened with methanol
or lens cleaning fluid to assist cleaning.
Mirrors:
Access to the mirrors is gained by removing the screen.
To remove grease or finger marks from the mirror surfaces use a surgical
cotton wool swab soaked with methanol. Apply the swab very lightly to the
mirror surface finally giving a light polish with another clean dry swab.
DO
NOT USE FORCE
. All mirror surfaces should be cleaned as
INFREQUENTLY
as possible.
WARNING! - Never use polishes, window cleaning aerosols or liquids
when cleaning the mirrors or lenses.
Screens:
All screens are made out of ground glass with printed cross lines. The cross lines
can be removed if the screen is not cleaned properly. We recommend that the
screens be cleaned only with soap (a mild non-lotion dishwashing solution) and
plenty of water. Use a lint free soft cotton cloth to gently clean. Let the screen air
dry.
.
