40. Weekly Preventive Maintenance Checks and Servicer
Caution: Be careful not to scratch or
crack mirrors or lenses.
a. Open rear and lamp house doors (par.
11c; figs. 7 and 7.1). Remove and clean
(par. 41) projection lamp. Clean re-
flector surface (fig. 28) and rear sur-
on PH-637C/PFP. Replace projection
lamp, and close rear and lamp house
b. Open door on left side of projector (fig.
2), except on PH-637C/PFP. Raise
projection stage on PH-637C/PFP (fig.
32.2). Clean rear surface mirror (fig.
24), front surface of condenser lens,
and bottom of Fresnel condenser lens
(par. 41). Close door, or lower projec-
Inspect the metal surfaces of the projector. The metal surfaces
should be free from dust, dirt, grease, and fungus.
a. Remove dust and loose dirt with a clean, soft cloth.
Warning: Cleaning compound is flammable and its fumes are
toxic. Provide adequate ventilation. Do not use near a flame.
b. Remove grease, fungus, and ground-in dirt from the case;
use a cloth dampened (not wet) with cleaning compound.
Caution: Be careful not to scratch or crack the mirrors and
lenses during cleaning.
c. Wipe the projection head window and projection stage plate-
glass cover with a clean, damp cloth.
d. Wipe fingerprints from the projection lens, reflector, con-
denser lens, rear surface mirror, and Fresnel condenser lens with
a lens tissue dampened with lens cleaner.
e. Clean the projection lamp with a clean, soft, cloth.
42. Operator`s Troubleshooting
If an abnormal condition is observed during the operator's pre-
ventive maintenance check (par. 39), perform the applicable