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MAINTENANCE AND INSPECTION 161
causing the others to receive no power. Turn off all the horns by means of keys on the output control panel. If these are not provided, then shut down by means of switches in the horn cut-out box backstage; then try to locate the bad receiver by turning the horns on and off, one at a time. They should all give volume except the bad one. When the defective receiver is found replace with a spare.
4. Possibly the fuses in the horn supply circuit on the battery panel have blown out.
5. Check the reproducers by switching from one to the other on the fader. If one is bad replace it as described under "Replacements." If neither gives any sound, check the fader and its circuit by means of the headset or as follows:
6. In systems using 41, 42, and 43 type amplifiers, the left-hand key at the top of the fader (called the fader cut-out key) can be used to cut out either side of the fader circuit. If this key is thrown to the left (red), for example, the reproducing equipment on the "red" machine will be connected directly to the amplifiers without going through the "red" side of the fader. Similarly, when the key is thrown to the right (white) side, the "white" machine is connected directly to the amplifiers. To determine whether the trouble is due to a defect in fader try using the cut-out key in this manner. If this act eliminates trouble, use the cut-out key for change-overs, instead of the fader, until a service engineer can repair or replace the latter. Regulate the volume by means of the gain control on the 41-A amplifier.
7. In film reproduction, the exciting lamp may be out of focus or burned out, or the opening in the photoelectric cell may be out of line with the opening leading to the film compartment. Adjust the cell properly.
8. If the system uses one or more 43-type amplifiers, and the plate current reading on one of these is very