TM 11-6730-235-12
3-5.
Operator Daily Preventive Maintenance Checks and Services Chart
Sequence
No.
Item to be inspected
Procedure
References
1
Completeness................ Check to see that all items required for operation are available
2
Cleanliness ..................... Clean all exterior surfaces, except lenses in lens head assembly, and
stage glass in case assembly.
3
Ventilation ....................... Inspect ventilating louvers on ends and bottom of case assembly
(fig. 1-1) to see that they are clean and free of any obstructions
to free circulating air.
4
Focus knobs................... Operate focus knobs to check that holster of arm and post assembly
move smoothly up and down post and is limited by top and bottom
stops.
5
Convenience outlet ........ Check to see that power is available at convenience outlet when
top plate assembly is in closed position.
6
On-off switch .................. Check to see that on-off switch operates smoothly and projection
lamp light when switch is in on position
7
Projection lamp .............. Check to see that projection lamp lights and remains lighted
throughout time on-off switch is in on position.
8
Thermal switch and ....... Check to see that blower motor star operation as soon as projec-
blower motor.
tion lamp comes on and remains on until projection lamp has cooled.
3-6.
Operator Weekly Preventive Maintenance Checks and Services Chart
Sequence
No.
Item to be inspected
Procedure
References
1
Projector ......................... a. Clean lenses in lens head assembly......................................................
b. Clean stage glass.....................................................................................
c. Clean fresnel lens in case assembly......................................................
2
Spring lock button .......... Check to see that spring lock button secures top plate assembly
in closed position.
3
Lens head assembly ..... Check to see that lens head assembly elevation angle can be
pivot
changed by pivoting head assembly. Pivoting action shall be
smooth without interruption.
the open position by the interlock arm (fig. 2-2).
3-7.
Cleaning
NOTE
Cleaning the projector is essential to proper operation.
Dirt on the lenses, stage glass, or fresnel lens can
If the projection lamp is lighted, raising the top
appear as a magnified image on the projection surface.
plate assembly should cause it to extinguish.
Images of this type not only are a nuisance, but can
(3) Press the fresnel lens latch to the side and snap
obscure or alter the information that should be projected.
the fresnel lens free.
a. Lenses. Clean the exterior surfaces of the top
(4) Wipe the underside of the stage glass with a
and bottom lenses in the lens head assembly with the
clean, lint-free cloth moistened in a soap and water
lens tissue supplied with the projector. If dirt particles
solution.
have worked themselves into the rim of the lens frames,
(5) Dry the stage glass with a dry, clean, lint-free
use a camel's-hair brush to work the dirt out.
cloth.
b. Stage Glass and Fresnel Lens. Clean the top of
(6) Repeat (4) and (5) above for the fresnel lens.
the stage glass with a lint-free cloth that has been
(7) Press the fresnel lens latch to the side and press
moistened in a soap and water solution and then wipe
the fresnel lens into place
dry. If the underside of the stage glass or the fresnel
(8) Press the bottom of the interlock arm towards
lens is dirty, proceed as follows: (1) Press the spring lock
the front of the projector to release the top plate
button that secures the top plate assembly; use any
assembly.
suitable pointed object.
(2) Raise the top plate assembly until it is locked in
3-2