TM-9-2350-273-BD

M48/M60 SERIES TANK, COMBAT FULL-TRACKED 105-MM GUN

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

TM-9-2350-273-BD - Page 162 of 288

11-6. OBSERVABLE

CONTROL BOX

TM 9-2350-273-BD

COMMUNICATIONS SYSTEM

SYMPTOM: THE INTERCOM DOES NOT WORK ON ANY

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 Mini-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. (Refer to para. 11-4.)

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 11-34.

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

in para. 11-30 or TM

-

9-2350-276-BD.

b.

If a defective cable is not found, then follow the

procedures in TM 11-5820-401-12.

troubleshooting

11-7. OBSERVABLE SYMPTOM:

THE INTERCOM WORKS ON SOME CONTROL

BOXES BUT NOT ALL

Detailed Assessment Steps:

1.

2.

and

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

Replace CVC helmet and connecting

connecting cable.

cable with a known operational CVC helmet

11-7