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610 RICHARDSON'S BLUEBOOK OF PROJECTION
possible has been done to prevent re-appearance of the same trouble.
Let us now apply these necessary generalities to the problems of finding different classes of trouble. The treatment of individual troubles which follows may profitably be contrasted with the more detailed prescriptions of the trouble charts, and in particular should prove useful in modifying those charts to meet individual projection room conditions as recommended in the instructions that precede them.
Loss of Sound
(11) This is usually the easiest trouble to find. Headphones applied to the sound transmission lines should quickly locate the apparatus or circuit at fault. The difficulty is then checked through that apparatus as has previously been explained in connection with the description of each sound system component.
However, if the equipment is provided with meters and signal lamps even the brief time necessary for a headphone test can sometimes be avoided. A momentary glance at those indicators may locate the difficulty at once by revealing the component that has failed.
The remedy to be applied depends, of course, upon the cause, and involves repair of the broken circuit, elimination of the short, or replacement of the faulty tube or other part, as the case may be.
Low Volume
(12) This trouble is harder to trace than complete loss of sound. It may be possible to judge by a headphone test at what point the amplification is insufficient or the line loss excessive, but such investigation may also result in nothing more than doubts and surmises. It is, however, simple enough to determine whether the fault is associated with either projector. If it is, then all voltages to the faulty machine should be checked with a meter, if not, then those supply voltages that are common to both projectors, and after them to the amplifier should be investigated in the ways hereafter explained. In some cases, finding the cause of low volume may require a