TM-9-2350-311-20-2

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR CAB, ARMAMENT, SIGHTING AND FIRE CONTROL, ELEVATING AND TRAVERSING SYSTEMS AND ASSOCIATED COMPONENTS

DECEMBER 1993

TM-9-2350-311-20-2 - Page 231 of 828

TM 9–2350–311–20–2

3–119

i.

INTERCOMMUNICATION SYSTEM

— CONTINUED

(5)

TELEPHONE OPERATOR CANNOT COMMU-

NICATE.

INITIAL SETUP

Test Equipment

Multimeter (item 6, Appx H)

Tools

Artillery and turret mechanic’s tool kit

(SC 5180–95–CL–A12)

Personnel Required

2

Personnel Required

TM 9–2350–311–20–1

Equipment Condition

Amplifier AM 1780/VRC POWER switch to OFF

(TM 9–2350–311–10)

Vehicle MASTER switch to OFF (TM 9–2350–311–10)

1.

Clean and adjust electrical contact arm assembly

(para 9–3).

2.

Place one multimeter lead in wire L2 and other

lead on terminal L2 of telephone connector on

back of vehicle.

3.

Check for continuity.

Is continuity present?

1.

Disconnect wire L2 at contact arm assembly

quick-disconnect.

2.

Place one multimeter lead in wire L2 and other

lead on terminal L2 of telephone connector on

back of vehicle.

3.

Check for continuity.

Is continuity present?

NOTE

Two personnel are required to perform the

following steps. Steps A through D must be

repeated for each contact arm assembly.

yes

no

A

B

CONTINUED ON NEXT PAGE

Go to step C.

–

+

WIRE L2

TERMINAL L2

CONTACT

ARM

ASSEMBLY