Fault Isolation Tests

TM 11-6130-392-34

wiring. Apply 0.04-0.08 inch coat of red staking

terminals. Go to section V.

j. Measure AC voltage across T1-6 and T1-7.

compound (SM-A-852314) to A14-CR1-2 positive

(+). Go to section V.

(1) If the voltage is more than 30 VAC; go to

Test 9. VOLTAGE TEST SELECT Switch (S12)

step k.

Short Circuit Test.

(2) If voltage is equal to or less than 30 VAC;

a. Set POWER to OFF.

set POWER to OFF, replace T1 (Section IV, para

b. Remove wire on S12-1 (fig. 4-2) that runs from

4-18). Go to section V.

TB1-E2 (fig. 3-3).

k. Set multimeter (F =

V, R = 200 V). Set

c. Set multimeter (F = Ω, R = 200 Ω). M e a s u r e

POWER to OFF.

l. Peel or pick away red staking compound from

resistance between S12-1 and S12-3.

(1) If resistance is less than 2 ohms; replace

Cl positive (+) terminal (fig. 3-3). Connect negative

S12 (Section IV, para 4-30). Go to section V.

lead () of multimeter to C1 negative () and con-

(2) If resistance is equal to or more than 2

nect positive lead to C1 positive (+).

m. Set POWER to ON; check multimeter.

ohms; check to find low resistance to ground at

either TB1-E2 (fig. 3-3) or S4A-C2 (fig. 4-2). Repair

(1) If voltage is more than 30 VDC; set POWER

fault; reconnect wire on S12-1. Go to section V.

to OFF, check for faulty wiring between A14-CR1-2

Test 10. Metering Circuit Test.

(fig. 4-2) and C1 positive (+) terminal (fig. 3-3) and

a. Set CHANNEL SELECT switch to position 1.

between C1 (+) and A6-21 connector (fig. 3-7). Re-

b. Check continuity from A6-4 connector (fig. 3-2

pair faulty wiring. Apply 0.04-0.08 inch coat of red

and 3-7) to TB1-E2 (fig. 3-3).

staking compound (SM-A-852314) to T1-1 through

T1-5 and C1 (+). Go to section V.

(1) If continuity is good; go to step c.

(2) If continuity is not good; go to step e.

(2) If voltage is equal to or less than 30 VDC;

c. Set multimeter (F = Ω, R = 200 K Ω). Measure

replace A14-CR1 (fig. 4-2) resistor assembly compo-

resistance between TB1-E2 and TB1-E15 (fig. 3-3)

nent (Section IV, para 4-22). Apply 0.04-0.08 inch

with VOLTAGE TEST switch depressed.

coat of red staking compound (SM-A-852314) to

(1) If resistance is less than 32,000 ohms; go to

C1 (+) and to T1-1 through T1-5. Go to Section V.

step d.

Test 8. High Voltage Power Supply Test.

a. Set multimeter (F = ~V, R = 200 V). Measure

(2) If resistance measured is equal to or more

voltage across T1-6 and T1-7.

than 32,000 ohms; go to step f.

d. Check continuity between VOLTAGE TEST

(1) If voltage is more than 10 VAC; go to step

switch S5-2 NC (fig. 4-2) and TB1-E22.

(2) If voltage is equal to or less than 10 VAC;

(1) If continuity is good; replace S5 (Section

set POWER to OFF, replace T1 (Section IV, para

IV, para 4-33). Go to section V.

4-18). Go to section V.

(2) If continuity is not good; repair faulty wire

between S5-2 NC and TB1-E22. Go to section V.

b. Measure AC voltage across two AC terminals

e. Check continuity between TB1-E2 and S4A-C2

of A14-CR1 (fig. 4-2) resistor ass embly component.

(fig. 4-2).

(1) If voltage is more than 10 VAC; go to step c.

(1) If continuity is good; replace CHANNEL

(2) If voltage is equal to or less than 10 VAC;

SELECT switch S4 (Section IV, para 4-29). Go to

s e t POWER to OFF, check for faulty wiring

section V.

between A14-CR1-3 (AC) and T1-6 (fig. 4-2) and

between A14-CR1-1 (AC) and T1-7. Repair faulty

(2) If continuity is not good; repair faulty wire

between TB1-E2 and S4A-C2. Go to section V.

wiring. Go to section V.

f. Set multimeter (F = Ω, R = 200 K Ω). Measure

c. Set POWER to OFF. Peel or pick away red

r e s i s t a n c e between TB1-E1 and TB1-E2 with

staking compound on A14-CR1-2 positive (+) ter-

VOLTAGE TEST switch depressed.

minal (fig. 4-2 and FO-1).

d. Set multimeter (F =

(1) If resistance is less than 17,500 ohms, go to

V, R = 200 V). Con-

step g.

nect negative () lead to A14-CR1-4 negative () and

(2) If resistance measured is 17,500 or more

connect positive (+) lead to A14-CR1-2 positive (+).

ohms; replace TB1-R1 (Section IV, para 4-31). Go to

e. Set POWER to ON; check multimeter

section V.

(1) If voltage is equal to or less than 20 VDC;

g. Set multimeter (F = Ω, R = 20 K Ω). Measure

set POWER to OFF, replace A14-CR1 (Section IV,

resistance between TB1-E5 and TB1-E6 (fig. 3-3).

para 4-22). Go to section V.

(1) If resistance is less than 9,500 ohms; go to

(2) If voltage is more than 20 VDC; set POWER

step h.

to OFF, check for faulty wiring between A14-CR1-2

(+) and C1 (+), C1 (+) and A6-21 connector, and C1

(2) If resistance measured is 9,500 or more

(+) and A14-R13-2 (fig. 4-2 and 3-3). Repair faulty

ohms; replace TB1-R11 (Section IV, para 4-31). Go

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