(1) Projector PH-637/PFP.
(a) First remove the pencil-groove section from the front of
the projector housing by removing the two screws that hold
it in place on each side and the single screw that holds it in
place along the bottom. T h e f r o n t s h e l f n e e d n o t b e
removed from the pencil-groove section.
(b) Remove the plate glass by sliding it out from between the
retaining strips that hold it in place. If the glass cannot be
moved easily, loosen the screws that hold one retaining strip
(c) Remove the Fresnel condenser lens
it out from
between the grooves in which it rests. The Fresnel con-
denser lens is an expensive and fragile part of the optical
system. Be careful not to scratch, bend, or break it.
(d) Replace the projection-stage plate glass and the Fresnel
condenser lens by reversing the instructions given in (a)
through (c) above. Be sure to replace the Fresnel con-
denser lens so that the convex side faces the projection lens.
(2) Projector PH-637A/PFP.
(a) Raise the housing cover until it is retained in the open
(b) Unscrew the two screws that hold the cover-glass retaining
strip in position, and remove the retaining strip.
Figure 26. Projector PH-637/PFP, pencil-groove section and front shelf removed.