Table 3-3. Resistance and Continuity Tests-Continued

TM 11-6625-2609-34

Table 3-3. Resistance and Continuity Tests-Continued

Isolating procedure

Normal indication

Point Of measurements

With EXTERNAL SQUELCH switch at A p p r o x i m a t e l y 10,000 ohms

Check test panel switch S2, potentio-

meter RI, and wiring between RI

ON and EXT. SQUELCH CONTROL

and W1P2B-38.

fully clockwise, between W1P2B-38

and W1P2B39.

With SQUELCH DISABLE switch at Infinite resistance. . . . . . . . . . . .

Check test panel switch S4 and wiring

between W1P2B30 and W1P2B-31.

OFF, between W1P2B-30 and W1P2B-

31.

Check radio control switch S3.

With SQUELCH DISABLE switch at

0 ohm . . . . . . . . . . . . . . . Check test panel switch S4 and wiring

between W1P2B-30 and W1P2B-31.

ON, between W1P2B-30 and W1P2B-

31.

With SQUELCH DISABLE switch at 0 ohm. . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S3 and

OFF, press COMM TEST switch and

wiring between W1P2B-30 and

W1P2B-31.

measure between W1P2B-30 and

W1P2B-31.

Connect alligator clips to + 28-vdc power 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check test panel relay K1 and wiring

supply. With POWER CB circuit

between K1 and P4-15 and P4-17.

breaker at ON and U-94A/U transmit

switch depressed; measure between

P4-15 and ground, then between P4-

17 and ground.

With VHF COMM frequency-selector

switches set to 116.000, measure from

W1P2B-27 to following points:

W1P2B-24 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S1A

(front).

W1P2B-23 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S1A

(rear).

0 ohm . . . . . . . . . . . . . . . . . . . . . . . . .. Check radio control switch S1A

W1P2B-19. . . . . . . . . . . . . . . . . . . . . . . .

(rear).

W1P2B-17 . . . . . . . . . . . . . . . . . . . . .

0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch SIB

(rear).

W1P2B-13 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch SIB

(rear).

W1P2B-9 . . . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S2A

(rear).

W1P2B-11 . . . . . . . . . . . . . . . . . . . . . . . . .

0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S2A

(rear).

W1P2B-1 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S2B

(rear).

W1P2B-2 . . . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S2B

(rear).

With VHF COMM frequency-selector

switches set to 127.125, measure from

W1P2B-27 to following points:

W1P2B-26 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S1A

(front).

W1P2B-18 . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S1A

(rear).

W1P2B-21 . . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S1A

(rear).

W1P2B-12. . . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch SIB

(rear).

W1P2B-10 . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . . Check radio control switch S2A

(rear).

W1P2B-3 . . . . . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check radio control switch S2B

(rear).

With VHF COMM frequency-selector

switches set to 138.250, measure from

W1P2B-27to following points:

W1P2B-21. . . . . . . . . . . . . . . . . . . . . . 0 ohm . . . . . . . . . . . . . . . . . . . . . . . . . . .

Check radio control switch S1A

(rear).

3-5