TM-9-2350-275-BD

M113 FAMILY CARRIER, PERSONNEL SELF-PROPELLED FULL-TRACKED

TECHNICAL MANUAL; OPERATORS, ORGANIZATIONAL, DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE; BATTLEFIELD DAMAGE ASSESSMENT AND REPAIR

TM-9-2350-275-BD - Page 113 of 223

TM 9-2350-275-BD

COMMUNICATIONS SYSTEM

11-6.

OBSERVABLE SYMPTOM:

THE INTERCOM DOES NOT WORK ON ANY

CONTROL BOX

Detailed Assessment Steps

1.

Make sure the DC power is available to the turret by checking the dome light or

other electrical equipment in the turret.

2.

Make sure the MK-2096 Transient Voltage Suppressor is operational by checking for

a red light on the suppressor. If the light is lit, replace or remove the suppressor.

3.

Make sure that the MX-7777 or MX-7778 Transient Voltage Suppressor is

operational by depressing the Battle-Override switch. If the suppressor is bad, replace

or repair as necessary.

4.

Check that communication equipment is turned on and the switches are in the

proper positions.

5.

Check that cables are connected to the proper connectors, correctly aligned, and

tightly connected to the receptacles.

6.

Jiggle the cables to check for intermittent opens or shorts.

a.

If a defective cable is found, follow the procedures listed below:

(1) Replace

the defective cable in accordance with standard repair

procedures.

(2) Replace the defective cable with an acceptable replacement cable (refer

to para. 11-35.

(3) Repair the defective cable in accordance with the repair procedures in

para. 11-30.

b. If a defective cable is not found, then follow the troubleshooting procedures in

TM 11-5820-401-12.

11-7. OBSERVABLE SYMPTOM THE INTERCOM WORKS ON SOME CONTROL

BOXES BUT NOT ALL

Detailed Assessment Steps

1.

Repeat steps 4 thru 6 in para. 11-6.

2.

Replace CVC helmet and connecting cable with a known operational CVC helmet

and connecting cable.

a.

If the problem no longer exists, replace the defective CVC helmet or

connecting cable.

11-7