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1340 HANDBOOK OF PROJECTION FOR
which the trouble lies is definitely located, though this does not mean that you must locate the particular part "itself. Each circuit in the amplifier, treated by itself, is very simple and easily tested. When the trouble breeding circuit is located, it is an easy matter to locate the particular part of the circuit which is upsetting things, whereupon it is likely the projectionist will be able to effect at least a temporary remedy with material at hand.
Starting with the assumption that no sound comes through the PEC amplifier, though the tubes and filament circuits test out O. K., it is more than likely we shall find the trouble in one of the plate circuits, remembering, however, that the fuses, PEC batteries, et cetera, are a part of the plate circuits.
Test voltage at the 6-pole switch on the wall first. In event of failure to get a reading on one or more of the terminals, then test the voltage at the batteries. If the voltage there is O. K., then we may conclude that one or more fuses are either blown or are not making current carrying contact.
With your battery and buzzer, test each fuse. If they all test O. K., then find the open by removing the fuses one by one, cleaning and tightening the contacts. Should a fuse blow immediately, with the 6-pole switch in open position you may look for a ground or short between the batteries and switch. Of course if the test shows the battery defective, then replace the battery.
WATCH THIS. — Sometimes, unless one watches closely, the screws under which the wires are clamped on the terminal strip in the battery box may extend through the strip and come into contact with the lead covering of the wires underneath. Make certain before