Troubleshooting Chart.

TM 11-6130-243-14-2

d. Troubleshooting Chart.

Probable trouble

Corrective measures

Symptom

1. Indicator lamp DS1 does not light a. No ac power is applied to power

a. Check for input voltage.

supply.

when POWER ON circuit breaker

b. Defective circuit breaker switch

b. Check circuit breaker switch; re-

switch is get to ON.

place if defective.

c. Open in output circuit . . . . . . . . . . . . c. Check for loose connections, broken

leads, or faulty components.

d. Open transformer T1 . . . . . . . . . . . d. Replace T1.

2. Low output voltage . . . . . . . . . . . . . . . . . . a. Defective resistor R2 . . . . . . . . . . . . a. Check resistor R2, replace if de-

fective.

b. Defective rectifier CR1, CR2, CR3,

b. Replace defective rectifier.

CR4, CR6, CR6, or CR7.

c. Defective power transformer T1 . . c. Replace defective power trans-

former.

3. Indication on DIRECT CURRENT Defective meter M2 . . . . . . . . . . . . . . . Replace meter M2.

VOLTS meter M2 differs from

voltage present at output.

4. With S1 depressed, no indication on a. Power supply not connected to a . Check connections to load.

DIRECT CURRENT AMPERES

load.

b. Defective switch S1 . . . . . . . . . . . . . b. Replace switch S1.

meter M1.

c. Defective M1 . . . . . . . . . . . . . . . . . . . .c. Replace M1.

5. Indication on meter M1 differs from a. Defective shunt resistor R1 . . . . . a. Replace shunt resistor R1.

b. Defective meter M1 . . . . . . . . . . . . . . b. Replace meter M1.

current present at output.

5-5. General Parts Replacement Techniques

All power supply parts can be reached and re-

placed easily without special procedures. Refer

to figures 5-1 through 5-4 for the location of

all parts.