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Projector Dusting Guidelines
The most important part of the maintenance program is cleaning. Dust on surfaces that the film touches can scratch the
film and render it useless for future exhibition. Dust does not remain in one place, but migrates to all parts of the
projector, causing film damage and possible bearing failure. Blowing dust off projector parts and surfaces with a high-
pressure air hose is not recommended. This activity drives the dust into the mechanisms, where it can cause damage.
The preferred approach for dusting the projector is to wipe surfaces with a soft cloth or brush them with a camel hair
brush. Vacuuming is also acceptable. If a part does not contain moving parts or dust-trapping cavities, remove it, take it
to a work area away from the projector, and blow it clean with high-pressure air. If desired, these parts can be cleaned on
the machine with the soft cloth or camel hair brush.
Daily Preventive Maintenance Requirements
Table 4.2 contains the daily preventive maintenance checklist/log sheet.
1.
Remove all 4 particle transfer rollers from the projector and, using a damp cloth or cloth with mild soap and water,
clean all debris from the rollers. Insure that the rollers are completely dry before re-installing.
2.
If necessary, clean the projection lens using the lens cleaning kit.
3.
Using the soft cloth, carefully wipe the guide rollers (see Figure 4.2)
4.
Remove the gate (see Figure 4.2) and clean the rails on both the movable and stationary gate portions thoroughly
with a soft cloth and isopropyl alcohol. If necessary, use a wooden or plastic scraping tool to remove heavy build-
up.
4.
While the gate is out, clean the trap (see Figure 4.2) using the soft cloth. Avoid areas near the BOF and EOF
sensors. As with the removable gate, keep dust and debris from entering the clearance spaces. Be certain that the
guide rails are absolutely clean.
5.
The BOF and EOF sensors are optical devices. Therefore, they must be cared for just as the rest of the optics. Due
to their delicacy, they must be cleaned gently with a soft camel hair brush.
6.
Dust and vacuum the film side of the projector to remove any film debris.
7.
Check the two buckle trips in the film path (see Figure 4.2) for proper operation.
8.
Check the sprockets (see Figure 4.2) or smooth movement. Since the two constant-velocity sprockets are driven
together, turn either one to check them both. The pulldown sprocket (see Figure 4.2) is directly driven, and does not
need to be checked.
CHRISTIE INC. - 35/70 Service/PM Manual
July, 1997
Avoid scratching the guide rails with metal objects. Scratches cause dirt to build up
faster in the gate, degrading picture quality.
4 : P e r i o d i c M a i n t e n a n c e
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