Fault Isolation Tests

TM 11-6130-392-34

(1) If resistance is equal to or less than 50,000

(2) If continuity is not good; replace CB1 (Sec-

ohms; replace panel meter M1 (Section IV, para

tion IV, para 4-19), apply 0.04-0.08 inch coating of

4-24). Go to section V.

red staking compound (SM-A-852314) on S6, T1,

terminals through 5. Go to section V.

(2) If resistance is more than 50,000 ohms;

replace TB1-R2 (Section IV, para 4-31). Go to sec-

g. Peel back red shrink sleeving on FL1 and FL2

tion V.

terminals (fig. 4-1 and FO-1). Check continuity be-

Test 4. Internal Battery (B-1) Test.

tween each filter and flat blades of power cable

V, R = 20 V). Con-

a. Set multimeter (F =

plug; should be continuity between FL1 and one

nect negative lead to C1 () negative (fig. 3-3). Con-

blade, FL2 and other blade.

nect positive lead to S12-9 (fig. 4-2 and FO-1); check

(1) If continuity is good; check for faulty wiring

voltage reading.

between FL1 and S6A-C (fig. 4-2), FL2 and S6B-C,

S6A-NO and CB1-2, S6B-NO and CB1-4, CB1-1 and

(1) If voltage is more than 1 VDC; go to step b.

T1-1, or CB1-3 and T1-5. Repair fault; apply 0.04-

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

to step f.

0.08 inch coating of red staking compound (SM-A-

b. Remove positive lead of multimeter from

852314) on S6 and CB1, and T1, terminals 1 through

S12-9; connect it to S12-C2 (fig. 4-2 and 3-3). Check

5, and replace heat shrink sleeving (Section IV, para

voltage reading.

4-23) on FL1 and FL2 terminal leads. Go to section

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

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

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

h. Peel back red shrink sleeving on FL1 and FL2

to step j.

c. Set POWER to OFF; check continuity between

and disassemble to gain access to filters (fig. 4-3 and

S12-C2 (fig. 4-2 and 3-3) and panel meter M1 posi-

para. 4-23). Check continuity of each filter.

tive (+) while VOLTAGE TEST switch is depressed.

(1) If continuity is good; replace power cable

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

(para 3-18), apply 0.04-0.08 inch coating of red stak-

ing compound (SM-A-852314) on S6 and CB1 and

(2) If continuity not good; check for faulty wir-

ing between S12-C2 and S5-3 NO (fig. 4-2 and FO-1)

T1, terminals 1 through 5, replace heat shrink sleev-

or between S5-3C and M1 positive (+). If wiring not

ing on FL1 and FL2 (Section IV, para 4-23), and

faulty; replace S5 (Section IV, para 4-33). Go to sec-

reassemble filter bracket. Go to section V.

tion V.

(2) If continuity is not good; replace faulty

d. Check for continuity between panel meter M1

filter(s) (Section IV, para 4-23), apply 0.04-0.08 inch

negative () and TB1-E13 (fig. 3-3) while VOLT-

coating of red staking compound (SM-A-852314) on

AGE TEST switch is depressed.

S6 and CB1 and T1, terminals 1 through 5. Go to sec-

(1) If continuity is good; replace M1 (Section

tion V.

IV, para 4-24). Go to section V.

i. Peel or pick away red staking compound cov-

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

ering T1 terminals (fig. 4-1 and FO-1). Set POWER

e. Check continuity between S12-C1 and S12-3

to OFF. Connect power cable to power source, and

(fig. 4-2).

set POWER to ON.

(1) If continuity is good; check for faulty wiring

j. Set multimeter (F = ~V, R = 200 V); measure

between panel meter M1 negative () and S5-2 C,

voltage between T1-4 and T1-5.

S5-2 NO and S12-C1, or between S12-3 and TB1-

(1) If meter reading is between 20 and 30 VAC;

E13 (fig. 3-3). If wiring is not faulty: replace S5

set POWER to OFF, apply 0.04-0.08 inch coat of red

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

staking compound (SM-A-852314) over T1 termi-

nals 1 through 5, and go to step k.

(2) If continuity not good; replace S12 (Section

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

(2) If meter reading is not between 20 and 30

f. Remove positive (+) lead from S12-9; connect it

VAC; set POWER to OFF, replace T1 (Section IV,

to CB1-NO (fig. 4-2).

para 4-18). Go to section V.

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

k. Check continuity from XDS1-1 to T1-4 and

to OFF, check for faulty wiring between S12-9 and

from XDS1-2 to T1-5 (fig. 4-2 and FO-1) using

S5-1 NO, or between S5-1 NO and CB1-NO. Repair

multimeter.

faulty wiring. Go to section V.

(1) If no fault found; replace power indicator

holder DS1 (Section IV, para 4-34). Go to section V.

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

go to step g.

(2) If a fault is found; resolder connection or

g. Remove positive lead (+) from CB1-NO (fig.

replace faulty lead. Go to section V.

Test 3. TB1-R2 Test.

4-2) and connect it to CB1-C.

a. S e t P O W E R t o O F F ; m e a s u r e r e s i s t a n c e

(1) If voltage is more than 1 VDC; replace CB1

between TB1-E7 and TB1-E8 (fig. 3-3) using mul-

(Section IV, para 4-19). Go to section V.

timeter setting (F = Ω. R = 200 K Ω ).

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

4-12