checks and corrective measures (a, b, and c below). If the trouble
is not corrected by these corrective measures, higher echelon
repair is required.
a. If the front shelf (PH-637/PFP, PH-637B/PFP, and PH-
637C/PFP) does not stay open, raise it until it snaps into the
locked position. If the left-hand shelf (PH-637/PFP or PH-
637A/PFP) does not stay in position, raise it, and manually pull
out the shelf support.
b. If the female power cable connector does not fit the power
cable receptacle on the front of the projector housing (on PH/
637/PFP and PH-637A/PFP), check the power cable receptacle.
Straighten bent prongs.
c. If the blower motor operates, and the projection lamp does
not light, open the rear and lamp house doors (figs. 7.1 and 24),
and check the projection lamp for secure mounting in its socket.
If the lamp is securely mounted in its socket, replace the lamp.
Section II. ORGANIZATIONAL MAINTENANCE
43. Scope of Organizational Maintenance
a. This section contains instructions covering second echelon
maintenance of Projector PH-637 (*) /PFP. It includes instruc-
tions for performing preventive and periodic maintenance serv-
ices and repair functions to be accomplished by the organizational
b. Second echelon maintenance of Projector PH-637 (*)/PFP
(1) Preventive Maintenance (par. 46 and 47).
(2) Lubrication (par. 47.1).
(3) Troubleshooting (pars. 47.2 and 47.3).
44. Tools, Materials, and Test Equipment Required
a. Tools. Tool Kit, Photographic Repair TK-77/GF.
(1) Cleaning compound, FSN 7930-395-9542.
(2) Lubricating Oil, General Purpose (LO) (FSN 9150-
special), (FSN 9150-273-2389).