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1360 HANDBOOK OF PROJECTION FOR
To test the next series of resistances, test from the input terminal that was not part of the circuit just discussed, to one of two remaining rows of screws. The procedure now is the same as that described.
The last resistances are connected to the remaining output terminal. Proceed as before.
When the fader is suspected, first see if the keys at the top are in the proper position. Next, throw over the key at the left, to the side that is causing the trouble. If this clears the trouble, it shows that the cause lies in that side of the fader. When there is still no sound, the trouble is probably in one of the two keys or in the wiring between them and the fader. If this is due to a ground, no sound will be heard at the input terminals when listening with the phones, but on removing the two wires from the input terminals, and connecting the phones to the wires the sound will come through O. K. If trouble is an open, sound will be present with wires on the terminals.
To locate the ground, first disconnect the wire that is fastened to the ground stud in the fader. Next, with a battery and voltmeter, test from ground to various blades of the keys, separating the contacts with a piece of paper or disconnecting the wires, as required, until the actual part or wire that is causing the trouble is discovered.
When sound is present at the input but not at the output, this will be caused by an open anywhere in the fader or the keys, a ground in the output end of the fader or in that part of the left-hand key used to switch from the fader to the emergency pad, or in a ground or short between the fader and the input transformer in the 41.