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158 SOUND MOTION PICTURES
selves familiar with the findings, in order to insure smooth operation. It is important to remember that, when the sound is not coming over as it should, the fader may be employed to suspend it until the trouble has been located and remedied. It is much better to do this than to continue an accompaniment that is obviously bad. If the fader is manipulated properly, difficulties may be handled by the projectionist with a minimum of audience discomfort. Whenever any trouble occurs use the emergency equipment or emergency set-up if one is provided. Try to locate and remedy the difficulty, if possible, by following the instructions given here.
Replace a burned-out fuse with a new one of the same type. If it blows out a second time, however, do not renew it until the cause of the trouble has been found and remedied. The installation has fuses at various points: reference must be made to the instruction furnished with each equipment, for specific details in this connection.
Before removing the rear cover of any piece of amplifier equipment be sure to turn off the power and to keep it off till the cover is replaced. Likewise throw off the power on the battery switching and charging panel before replacing any fuses.
If, although all conditions are normal, no sound comes from the horns and no relief is afforded by any of the procedures described, a break exists somewhere in the sound circuit. In such case listen in with the headset along the circuit, starting at the disk or film pick-up with a record playing, and working on toward the horns, until the bad spot is located. Be sure to use very little gain, since otherwise the headset will be overloaded and may be damaged, and the quality will be spoiled. Use the same method to locate the source of a foreign noise or any bad tone quality.
Use a battery and buzzer to test lines for opens or shorts, but never to test the amplifier or reproducer circuits. To