ARMY TM 9-6115-464-34
AIR FORCE TO 35C2-3-445-2
NAVY NAVFAC P-8-624-34
Inspect cover and chassis for cracks, corrosion, warping, dents, and defective paint.
Inspect relays for cracked casing, corroded terminals and evidence of shorting or overheating.
Inspect overload protective device for cracked casing, corroded terminals, and evidence of shorting
Inspect tactical relay resistor assembly for burns, cracked or damaged components, and evidence of
Inspect terminal board assembly for cracks, corroded terminals and terminal jumpers, and evidence
Inspect wiring harness assembly for excessive wear, cracks, stripped threads, damaged or loose
pins in connectors, and burned wires indicating shorts. Check individual wires for continuity using
figure 3-112 as a guide.
Check all threads for crossing, stripping, and peening.
Test reverse power relay as follows:
Install reverse power relay in test circuit shown in figure 3-113.
Place all switches in the open position and activate power source G1. Adjust output until voltmeter
V1 indicates 3 volts.
Place switch S2 in position B and activate power source G3.
Place switches S1, S4, and S5 in the closed position.
Test lamp DS2 shall illuminate.
Activate power source G2 and adjust output until voltmeter V2 indicates 5 volts.
Adjust output of power source G1 until voltmeter V1 indicates less than 1 volt.
Position switch S2 in A position and switch S3 in closed position.
Slowly increase output of power source G1 until test lamp DS2 extinguishes and test lamp DS1
Check indication of voltmeter V1. Indication shall be 1 to 3 volts.
(10) Test over voltage relay as follows:
Install relay in test circuit shown on figure 3114.
Activate power source G1 and adjust voltage to 120 Vac at 50 Hz.
Activate power source G2 and close switch S2.
Test lamp DS1 shall illuminate and test lamp DS2 shall remain extinguished.
Vary frequency output of power source G1 from 50 to 450 Hz. There shall be no change in test
Slowly increase output voltage of power source G1 to 149 Vac. Vary frequency from 350 to 450 Hz.
DS1 shall remain illuminated and DS2 shall extinguish.
Slowly increase output voltage of power source G1 to 154 Vac. Vary output frequency from 50 to
100 Hz. DS1 shall remain illuminated and DS2 shall remain extinguished.