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1358 HANDBOOK OF PROJECTION FOR
kills the sound, whereas an open circuit in the line connecting the disc equalizer does not. In the case of the equalizer two wires are tapped to the line at the film disc transfer switch and then run over to the equalizer panel. From the film amplifier the ouput is taken to the attenuator and then a line is run back to the transfer switch, so that a break here results in no sou7nd. The continuity test must be made either with the voltmeter or with phones, using a battery with either of them. Battery and buzzer will not work because not enough current will flow through the resistances of the attenuator, which are in series with the test circuit, to actuate the buzzer.
The line from film amplifier to the attenuator can be tested for grounds and shorts with a battery and buzzer without disconnecting the attenuator. This also applies to the line from the attenuator to the transfer switch, the switch itself and the wiring from the switch to the fader. If you intend to use a battery and voltmeter to make this test, you must first disconnect the attenuator and the output transformer in the film amplifier, then place the film disc switch in the center position if testing only this far. If you also want to test the wiring from here to the fader for grounds you must disconnect the wires at the fader which are coming from the particular machine being tested. This is because the meter will give a reading due to the connection caused by the circuits across the line, that is, the output transformer, the attentuator, or the fader.
It isn't likely that the attenuator itself will become grounded or shorted, but should you wish to test for this, first disconnect the input and the output, and take off the small bar that is used to make the adjustments.