Fault Isolation Tests

TM 11-6130-392-34

Table 4-3. Troubleshooting Test Procedures Continued

Column 2

Column 3

Column 1

Malfunction Indication

Reference or Instruction

Test Procedure

None.

( 1 1 ) If troubleshooting tests are now

completed, turn POWER switch to

OFF. Remove power cable from 115

VAC source. Remove band from in-

terlock switch and remove clip leads

from REMOTE BATTERY jacks. As-

semble retainer and cover and set

controls per para 3-10e. Refer to

figure 3-1.

None; lamp lights.

Go to section V for performance testing

(12) Connect power cable to 115 VAC. Set

POWER switch to ON. POWER ON

lamp should light.

( S M - A - 8 5 2 3 1 4 ) over T1 terminals 1 through 5.

4-12. Fault Isolation Tests

Replace S1 (Section IV, para 4-21). Go to section V.

Tests, for use by general support (GS) maintenance

( 2 ) If POWER switch trips OFF; reconnect

personnel, are included or referenced for compo-

w i r e s to T1-1, T1-2, T1-3, and T1-5. Apply a

nents authorized for test, replacement, or repair at

0.04-0.08 inch coat of red staking compound

GS level.

( S M - A - 8 5 2 3 1 4 ) over T1 terminals 1 through 5.

a. Refer to tests, used at direct support level, in

Replace CB1 (Section IV, para 4-19). Go to section

Chapter 3, paragraph 3-12.

b. Numbered tests, specifically added for use at

Test 2. Power Input Circuit Test.

GS level, areas follows:

a. Set POWER to OFF. Remove power cable

from 115 VAC source. Set POWER switch to ON.

Test 1. Power Supply Assembly (A11) Short Cir-

M e a s u r e resistance between two flat blades of

cuit Test 2 .

power cable plug with multimeter (set F = Ω, R =

a. Peel or pick away red staking compound on

200 Ω ).

positive (+) terminal of filter capacitor C1 (fig. 4-1)

and disconnect leads from terminal.

(1) If meter reading is 5 ohms or more; go to

step b .

b. Set POWER switch ON.

(2) If meter reading is less than 5 ohms; set

(1) If POWER switch remains ON, replace C1

POWER switch to OFF, reconnect power cable to

(Section IV, para 4-17). Go to section V.

115 VAC source, and go to step i.

(2) If POWER switch trips OFF, connect leads

b. Peel or pick away red staking compound on T1

to Cl and apply a coating of red staking compound

(fig. 4-1 and FO-1). Check for continuity between

(SM-A-852514) over connection. Disconnect trans-

T1-1 and each of two flat blades of power cable plug;

former lead T1-6 (fig. 4-1) on transformer.

c. Set POWER switch ON.

c h e c k also between T1-5 and same two blades.

There should be continuity (less than 0.2 ohms) from

(1) If POWER switch remains ON, set POWER

T1-1 to one blade, and from T1-5 to other blade.

switch OFF and replace A14-CR1 (Section IV, para

4-22). Go to section V.

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

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

(2) If POWER switch trips OFF, reconnect lead

c. Measure resistance between T1-1 and T1-2,

to T1-6. Peel or pick away red staking compound on

and between T1-3 and T1-5 (F = Ω, R = 200 Ω ).

T1 and disconnect leads from T1-2 and T1-3 (fig.

4-1).

(1) If resistance is less than 5 ohms; go to step

d. Set POWER switch ON.

(2) If resistance is equal to 5 ohms, or is

(1) If POWER switch remains ON, set POWER

greater; replace T1 (Section IV, para 4-18). Go to

switch OFF. Replace T1 (Section IV, para 4-18). Go

section V.

to section V.

d. Peel or pick away red staking compound on S1

(2) If POWER switch trips OFF, disconnect

leads from T1-1 and T1-5.

(fig. 4-2 and FO-1). Check for continuity between

S1-1 and S1-2, and between S1-4 and S1-5.

e. Set POWER to ON.

(1) If POWER switch stays ON; set POWER to

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

between T1-1 and S1-4, T1-2 and S1-2, T1-3 and

OFF, reconnect wires to T1-1, T1-2, T1-3, and T1-5.

S 1 - 5 , or T1-5 and S1-1. Repair fault; apply a

Apply a 0.04-0.08 inch coat of red staking compound

4-7