TM-9-2350-274-BD

M109/M110/M578 VEHICLES HOWITZER, MEDIUM, SELF-PROPELLED FULL-TRACKED

TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE

JANUARY 1984

TM-9-2350-274-BD - Page 153 of 219

TM 9-2350-274-BD

COMMUNICATIONS SYSTEM

Detailed Assessment Steps (Cont):

3.

4.

Disconnect CX-4723 cable leading to the non-operational control box at the AM-

1780, and switch it with another CX-4723 cable at the AM- 1780 receptacles.

a. If the same problem occurs in the control box now connected to that receptacle,

repair or replace the AM-1780.

b. If the problem stays with the same control box, go to step 4.

Switch the CX-4723 cables back to their original positions on the AM-1780, and

replace the non-operational control box with a-known operational control box.

a. If the problem no longer exists, replace or repair the control box.

b. If the problem still exists, replace or repair the CX-4723 cable between the

control box and the AM-1780. (Refer to para. 11-12 or 11-13.)

5.

If the cable and/or the control box cannot be repaired or replaced, install the field

expedient intercom described in para. 11-10 or 11-11.

11-7