16H Manual Page 18
Revised: 11/2015
6.0 MAINTENANCE
SECTION ONE
6 . 1 Cleaning the lenses, screen and mirrors
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.
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. Wipe the bulk of
water with a (no lotion no oils) plain bathroom tissue paper then let the screen air
dry.