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 164 of 219

TM 9-2350-274-BD

COMMUNICATIONS SYSTEM

11-15. ISOLATION OF VOLTAGE SUPPRESSORS

General Information

This procedure gives instructions for the isolation and by-passing the MX-7777/MX-7778

Transient Voltage Suppressor.

Limitations:

●

Possible loss of all communications

Personnel/Time Requied:

●

1 soldier

●

5-10 minutes

Procedural Steps:

CAUTION

Without the transient voltage suppressor in the circuit, voltage spikes will be

routed through the communications equipment and damage could occur. Use

only as a last resort.

1.

Removal of MX-7777/MX-7778 transient voltage suppressor:

a.

Locate the MX-7777/MX-7778 in the vicinity of the driver's compartment.

b.

Remove the CX 10613/G cable which runs between the vehicle power

receptacle and the rear of the voltage suppressor.

c.

Remove the Bendix connector which is attached to one of two possible plugs

on the top of the suppressor.

d.

Plug this Bendix connector directly into vehicle power receptacle.

e.

The suppressor is now out of the circuit.

2.

Record the BDAR action taken. When the mission is complete, as soon as

practicable, repair vehicle using standard maintenance procedures.

11-18