a. repair of the visual indicator.
b. repair to the press-to-talk switch.
c. replacement of the buzzer volume control.
d. replacement of the moisture-preventing diaphragms.
14. When the buzzer volume control knob on the TA-1/PT is turned to OFF, no sound is produced by
incoming signals. The production of sound is prevented by
a. opening the circuit to the buzzer.
b. clamping the armature of the buzzer.
c. shunting the circuit around the buzzer.
d increasing the separation between the armature and the diaphragm.
15. The incoming voice signals to the TA-1/PT pass only through the receiver unit (fig 1, para 5-3 TM 5805-
243-13) current are prevented from passing thorough the transmitter element by
a. generator switch S2.
b. limiting resistor R1.
c. press-to-talk switch S1.
d. high impedance in the buzzer winding.
16. Telephone Set TA-1/PT consists of four local circuits which can be traced from L1 to L2 in figure 1 of
TM 11-5805-243-35. Tracing these circuits will disclose that capacitor C1 is common to the
a. voice transmission circuit and the voice reception circuit.
b. voice reception circuit and the outgoing signaling circuit.
c. outgoing signaling circuit and the incoming signaling circuit.
d. incoming signaling circuit and the voice transmission circuit.
17. Assume that troubleshooting procedures show that the buzzer operates satisfactorily on incoming signals,
but the visual indicator does not. The probable trouble is a defective
a. buzzer coil.
b. buzzer diaphragm.
c. visual indicator coil.
d. visual indicator mechanism.
410 L4
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