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CHAPTER XXXII MAINTENANCE OF SOUND EQUIPMENT
When trouble of any kind occurs (if, for example, sound stops) the usual condition confronting the projectionist is that his difficulty may be almost anywhere in the entire theatre. It may be backstage among the speakers, or down cellar at the meter fuses, or up in the hanging ceiling in the speaker supply lines, or it may be, and most likely is, somewhere in the varied apparatus and wiring of the projection room.
Finding Trouble
(1) Therefore the first step in finding any kind of trouble is to find out, not what, but where it is. Until that much has been done the projectionist cannot even begin to look for its cause because he will have little or no idea of where to start.
How any particular kind of trouble may be traced down to some one piece of apparatus or some one circuit is explained further on under appropriate headings.
(2) When the difficulty has been so far isolated that the projectionist is able to say with certainty that it lies in this amplifier or that control cabinet or whatever the apparatus may be, the exact fault is hunted inside that apparatus. How to find troubles inside each component part of a sound installation has already been explained in detail.
(3) When trouble occurs during the course of a show speed in finding it and repairing it is of the greatest importance. Every minute of delay in restoring the performance may mean another dollar or another ten dollars in box office refunds (depending upon the class of theatre) and just that much more patron dissatisfaction. Therefore the projectionist confronted with unexpected
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