Operating instructions

2-1
SECTION 2
MAINTENANCE AND ADJUSTMENTS
The installation of the Dolby CP45 in your theatre indicates a commitment
to providing a high-quality presentation to your audiences. However,
the presence of even the very best equipment does not in itself guarantee
the best results. A number of routine maintenance and adjustment
procedures, requiring no special test equipment or technical knowledge,
are necessary to realize the full potential of the sound system on a day-
to-day basis. These procedures can also prevent costly show
cancellations and service calls.
A Dolby Cat. No. 69T test film is required for proper maintenance of
your sound system. We also recommend that you keep on hand the
Dolby Cat. No.251 Jiffy Test Film and run it regularly to check the
theatre sound system thoroughly (see Appendix B).
A. SOUNDHEAD MAINTENANCE
No single maintenance procedure is more vital to good sound in the
theatre than regular cleaning of the projector soundhead optics. Use
lint-free cotton swabs and isopropyl alcohol to clean the optical barrel
lens surfaces, but, under no circumstances touch or attempt to clean the
solar cell. The solar cell and its adjustment are extremely delicate. We
strongly recommend that you use compressed air, available in convenient
pressure cans, to blow dirt and debris away from the cell. But be
absolutely certain that the nozzle cannot ever touch the cell.
Figure 1 Cleaning the Soundhead Optics