Table 3-3. Resistance and Continuity Tests

TM 11-6623-2609-34

Table 3-3. Resistance and Continuity Tests-Continued

Normal indication

Isolating procedure

Point of measurements

Between test panel jack J19 and Short circuit ------------------------------ Check wiring between J19 and ground.

ground.

Between test panel jack J17 and Short circuit---------------------------------- Check wiring between J17 and

W1P2A-16.

Between test panel jack J16 and Short circuit----------------------------------- Check wiring between J16 and

W1P2A-15.

Between test panel jack J15 and Short circuit ------------------------------ Check wiring between J15 and

W1P2A-23.

Check wiring between J14 and

Between test panel jack J14 and Short circuit--------------------------------

W1P2A-22.

Between test panel jack J13 and Short circuit -------------------------------- Check wiring between J13 and

W1P2A-21.

Between test panel jack J12 and Short circuit ---------------------------------- Check wiring between J12 and

W1P2A-28.

Between test panel jack J11 and Short circuit ---------------------------------- Check wiring between J11 and

W1P2A-27.

Between test panel jack J10 and Short circuit --------------------------------- Check wiring between J10 and

W1P2A-26.

Between test panel terminal board Short circuit --------------------------------- Check wiring between TB1-3 and

TB1-3 and W1P2A-5 and W1P2A-6.

W1P2A-5 and W1P2A-6.

Between black alligator clip and W1P2A- Short circuit --------------------------------- Check wiring between black alligator

and W1P2A-2.

clip and W1P2A-1 and W1P2A-2.

With POWER CB circuit breaker at ON, This is forward-biased resistance of Check CR1, Ml, and wiring between

between alligator clip + 28V and

alligator clip +28V and W1P2A-3

CR2 and resistance of Ml. Resis-

W1P2A3 and W1P2A-4 (positive ter-

tance will vary with applied voltage.

and W1P2A-4.

minal of ohmmeter connected to alli-

gator clip).

With VHF COMM OFF-PWR switch at 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S4 and

PWR, between W1P2A-9 and ground.

wiring between S4 and W1P2A9.

With VHF COMM OFF-PWR switch at Approximately 30 ohms . . . . . . . . Check radio control lamps DS3, DS4,

OFF, between TB1-4 and ground (pos-

and DS5, and intercom control

itive probe of ohmmeter to TB1-4).

lamps DS1 and DS2.

With VHF COMM OFF-PWR switch at Approximately 20 ohms. . . . . . . . .

Check radio control lamps DS1 and

PWR, between TB1-4 and ground

DS2 and switch S4.

(positive probe of ohmmeter to TBl-

4).

Between test panel jack J5 sleeve and 0 ohm ------------------------------------------- Check wiring between J5 and W1P2B-

W1P2B-29.

29.

Between test panel jack J5 tip and 0 ohm. . . . . . . . . . . . . . . . . . . . . . . . Check wiring between J6 and

W1P2B-28.

Between test panel jack J6 and W1P2B- 0 ohm. . . . . . . . . . . . . . . . . . . . . . . . . . . Check wiring between J6 and

28.

W1P2B-28.

Between test panel jack J7 and W1P2B- 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . Check wiring between J7 and

29.

W1P2B-29.

Between test panel jack J8 and W1P2B- 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check wiring between J8 and

36.

W1P2B-35.

Between test panel jack J9 and W1P2B- 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . Check wiring between J9 and

36.

W1P2B-36.

With AUDIO switch at ON, between Approximately 500 ohms . . . . . . . . . . . . Check radio control potentiometer R1

W1P2B-35 and W1P2B-36.

and wiring between W1P2B-35 and

W1P2B-36 and radio control.

With radio control and intercom control Approximately 150 ohms . . . . . . . Check radio control potentiometer R1,

VOL controls both fully clockwise, be-

intercom control, and wiring to J4.

tween test panel jack J4 tip and sleeve

contacts.

Between W1P2B-37 and W1P2B-39.

Approximately 10,000 ohms . . . . . . . Check test panel potentiometer RI and

wiring between R1 and W1P2B-37

and W1P2B-39.

3-4