Quarterly Preventive Maintenance Checks and Services Chart

TM 11-6625-1635-12

Sequence

Item to be

References

Procedure

inspected

No.

VHF COMM VOL control. . . . . . . . Leave equipment adjusted as described in

sequence No. 17. Vary VHF COMM VOL

control from minimum to maximum. Signal

in the headset should increase as control is

turned maximum clockwise.

I n t e r c o m c o n t r o l V O L c o n t r o l Leave equipment adjusted as described in

(maintenance kit modified only)

s e q u e n c e 17. Vary VOL control from

minimum to maximum. Signal in H-

1 0 1 A / U should increase as control is

turned clockwise.

PTT switch. . . . . . . . . . . . . . . . . . . . . . Perform the procedure given in paragraph 2-

6d (5) and then the procedure in paragraph

2-6e. A power output indication should be

observed on the AN/URM-43A and, on

the maintenance kit modified, the dc am-

meter should indicate between 6 and 9 amps.

MIKE jack (maintenance kit un- Perform the procedure given in paragraph 2-

modified)

6f. The AN/ARC-134 sidetone should be

heard in the H-216/U.

SIDETONE jack (maintenance kit Perform the procedure given in paragraph 2-

6 f (1) through (4). The AN/ARC-134

unmodified)

sidetone should be heard in the headset.

MIKE INPUT jack (maintenance Perform the procedure given in paragraph 2-

kit unmodified)

6h (1) through (7). A modulation indication

should be observed in the AN/ARC-134.

Transmit-Interphone Selector Switch Perform the procedure given in paragraph 2-

(maintenance kit modified only)

6g. Sidetone should be heard when transmit-

interphone selector switch is in Position

INT.PVT. and 3. Power output should be

observed on the AN/URM-43A only when

the selector switch is in position 3.

DBM INPUT jacks. . . . . . . . . . . . Perform the procedure given in paragraph 2-

6h. A modulation indication should be

observed on yhe AN/AQRC-134 meter.

DATA LINK INPUT jacks . . . . . . Perform the procedure given in paragraph 2-

6h. A modulation indication should be

obtained on the AN/ARC-134 meter.

See paragraph 6i. Modulation should be

DETECTOR METER

indicated by a meter deflection on the TS-

DETECTOR INPUT and

352/B/U and by an increase in the

SCOPE OUTPUT jacks

AN/URM-43A indication.

3-7. Quarterly Preventive Maintenance Checks and Services Chart

App B.

3-3