Figure 4-2. Synthesizer test tray A3, trouble localization test equipment.

TM 11-6625-847-12

Figure 4-2. Synthesizer test tray A3, trouble localization test equipment.

4-19.

Common Module Tray A2, Trouble Isolation Chart

Item

No.

Trouble symptom

Probable trouble

Checks and corrective measure

POWER indicator lamp

a. Defective external 27-volt

a. Higher category repair re-

will not illuminate

dc power supply.

quired.

b. Improper seating of input

b. Tighten power connector.

power connector.

c. Defective test set fuse-------------------------

c. Replace fuse (para 4-26a).

d. Defective indicator light ----------------------

d. Replace indicator light (para

4-26b).

e. Defective POWER switch -------------------

e. Higher category repair re-

quired.

f. Higher category repair re-

f. Defective test set SERV SEL

switch. quired.

When AN/PSM-6 dc tests

a. Improper seating of input

a. Tighten power connector.

leads are connected to

power connector.

RCVR IF test points

b. Defective RCVR IF TEST

b. Higher category repair re-

HI and LO, voltage

SELECTOR switch.

quired.

varies more or less than

limits of 29 to 31 volts

dc.

When RCVR IF TEST

a. Improper seating of input

a. Tighten power connector.

SELECTOR switch is

power connector.

placed at 2, and RCVR

b. Defective RCVR IF TEST

b. Higher category repair re-

IF GAIN control is ro-

SELECTOR switch.

quired

tated from fully counter-

c. Defective RCVR IF RF

c. Higher category repair re-

clockwise to clockwise,

GAIN control.

quired.

voltage varies more or

less than limits of 0.35

to 2.5 volts dc.

4-10