Section II. DIRECT SUPPORT REPAIR PROCEDURES AND ADJUSTMENTS

TM 11-6760-238-34

Table 3-3. Direct Support Troubleshooting-Continued

SYMPTOM

PROBABLE TROUBLE

CORRECTIVE ACTION

c. Defective control panel test board and components assembly A4

Replace control panel test board and components assembly A4 (para 3-8d)

19. AUTO LAMP A7DS1 DOES NOT LIGHT (step 27), DC POWER LAMPS ON

a. Defective AUTO lamp A7DS1 or indicator lamp assembly A7

Replace lamp or indicator assembly A7 (para 3-8t)

b. Defective MASTER switch S3

Refer to higher category of maintenance

c. Defective control panel test board and components assembly A4

Replace control panel test board and components assembly A4 (para 3-8d)

20. D LAMP A2DS3 DOES NOT LIGHT (step 29), DC POWER LAMPS ON

a. Defective D lamp A2DS3 or indicator lamp assembly A2

Replace lamp or indicator assembly A2 (para 3-8t)

b. Defective MASTER switch S3

Refer to higher category of maintenance.

c. Defective relay assembly test board and components assembly A1.

Replace relay assembly test board and components assembly A1 (para 3-8f).

Section II. DIRECT SUPPORT REPAIR PROCEDURES AND ADJUSTMENTS

Replace shutter assembly test board (5) in position on

WARNING

test panel (2) and secure with hardware removed in step

When making repairs or adjustments, be

b above.

extremely careful of the ac line voltage.

d. Removal of Control Panel Test Board.

Always disconnect the power source

(1) Unsolder and tag all wires attached to

from the equipment making repairs.

the control panel test board (9).

3-7. General Parts Replacement Techniques

(2) Remove four screws (6), lockwashers

All of the parts and assemblies m the shutter test set can

(7), flatwashers (8), and remove control panel test board

easily be reached without any special procedures.

(9) and two spacer assemblies (22) from test panel (2)

NOTE

e. Replacement of control panel test board.

Before any part is removed, note the

(1) Place lockwasher (7), and flatwasher (8)

position of the part and its leads. Wire

on screw (6) and insert in control panel test board. Place

replacement parts in essentially the

spacer (22) on screw (6) and mount on test panel (2)

same position to avoid undesired

Repeat this procedure for the rest of the hardware.

coupling and shorting together of wires.

(2) Replace and solder all wires removed in

If necessary, use tags.

step d(1) above.

3-8. Direct

Support

Disassembly/Assembly

f. Removal of Relay Assembly Test Board.

Procedures

(1) Unsolder and tag all wires attached to

(FO-4)

the relay assembly test board (14).

NOTE

(2) Loosen two setscrews (p/o 13) and

Localizing trouble in the shutter test set

remove RELAY ASSY switch knob (13).

(para 3-2) can simplify repairs by limiting

(3) Remove nut, lockwasher and flatwasher

the work to the defective area. Repair or

(p/o 14) from the front of test panel (2) and remove relay

replace

the

defective

assembly,

assembly test board (14) from test panel (2).

subassembly or part; then assemble the

g. Replacement of Relay Assembly Test Board.

shutter test set. Disassembly of the test

(1) Mount relay assembly test board (14) in

set should be limited to major

test panel (2) and secure with hardware removed in step

subassemblies

and/or

major

f(3) above.

components.

(2) Replace RELAY ASSY switch knob (13)

a. Removal of test Panel. Remove 14 screws (1)

removed m step f(2) above and tighten the set screws.

from test panel (2) and move test panel away from cat

(3) Replace and solder all wires removed in

(3)

step f(1) above.

b. Removal of Shutter Assembly Test Board.

NOTE

Remove two screws (4) from shutter assembly test

Removal and replacement instructions

board (5) and carefully remove shutter assembly test

listed

board from test panel (2).

c. Replacement of Shutter Assembly Test Board.

3-7