paper is centered laterally with reference to the lens. T h e n
tighten the support-post clamping screw and the support-
post locating-plug clamping screw.
(2) If `there is a displacement from front to back, raise the
housing cover (PH-637A/PFP) or remove the pencil-groove
section from the front of the housing (PH-637/PFP).
Then loosen the rear surface mirror adjusting screws, and
adjust the position of the mirror up or down until the octagon
of light visible on the paper is centered with reference to
the lens. Tighten the adjusting screws, and lower the
housing cover (PH-637A/PFP) or replace the pencil-groove
section (PH-637/PFP).
e. Close the lamp house door, and latch it in place. Loosen the
two screws that hold the reflector mounting plate in place. While
observing the image on the projection screen, move the reflector mount-
ing plate both vertically and horizontally until a screen image with
the best overall brightness characteristics is obtained. Tighten the
two screws at this position.
Note. If the image shows brown or blue corners, the corners should be of
the same size and symmetrically placed.
f. Place a transparency on the projection stage, focus the projector
until the projected image is sharp, and then remove the transparency.
(1) If the corners of the blank screen image are blue, the lamp
is too close to the condenser lens.
(2) If the corners are brown, the lamp is too far from the con-
denser lens.
(3) If the conditions mentioned in (1) or (2) above are present,
proceed as follows :
(a) Grasp the projector by the projection-head support arm,
and tilt it to one side. Then insert a screwdriver through
the two holes in the bottom cover plate, and loosen the two
lamp-stand mounting screws (fig. 30). Tilt the projector
to the other side, insert a screwdriver through the two holes
in that side of the bottom cover plate, and loosen the other
two lamp-stand mounting screws. Set the projector back
in the normal position.
(b) Reach in through the rear door of the projector housing.
If the corners of the screen image are blue, move the lamp
stand back slightly until the blue disappears. If the
corners are brown, move the lamp stand forward slightly
until the brown disappears. Adjust the lamp stand to a
position where the best combination of clear screen image
and sharp definition is obtained.
Caution: Be careful not to touch the projection lamp.
(c) Close the rear door of the housing. Be very careful not
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