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Low Volume
This may be caused by low voltage, by a film with a low recording level, or by too high a print density. Check such a film with one known to be good. See that the exciter light is correctly aligned and as bright as it should be.
Low sound may be caused by dust covering some part of the sound optical system, and this should be cleaned as previously directed. In exciter ray systems the lower end of the projector lamp must also be cleaned, as it often gets completely covered by dust drawn into the lamphouse by the cooling system. Other faults within the amplifier are extremely difficult to find, and their location is best left to an expert to find with the aid of proper instruments.
Sound Poor and Distorted
First try to locate the fault by careful listening. A crackling noise from the speaker usually indicates sparking somewhere, so look for a loose connection. If the sound has a "wow" to it, check the smoothing system and examine the lacing of the film. The crackling noise may also be caused by a faulty valve or by a valve not making proper contact. See that the prongs fit properly and are perfectly clean and free from oil. If necessary, clean them with No. oo sandpaper, but wipe them afterwards.
Other causes of poor sound may be due to a faulty switch, a defective valve or exciter lamp, improperly fitted speakerleads, metal objects adhering to the magnetic base of the speaker, a deteriorating condenser in the amplifier, or irregular speed of the projector drive, which in turn may be due to fluctuating voltage or failure of the automatic speed-governor. There are many other possible causes, and among which may be a faulty fuse or the radio set next door.
The faults listed above are the ones most likely to worry the beginner, but there are lots of other faults which may occur from time to time, which may be peculiar to the individual's own particular brand of carelessness or to the idiosyncrasies of his own machine. But all, or nearly all of these faults may be prevented by the operator carefully following the manufacturers' instructions on the use and correct operation of his equipment. And, refraining from the urge to experiment, as it sometimes takes two people to put the machine together again !
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