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 217 of 828

TM 9–2350–311–20–2

3–105

Replace amplifier

AM1780/VRC (para 8–16).

END OF TASK

Replace cable CX4720

(para 8–16).

yes

no

E

CONTINUED FROM STEP D

CABLE CX4720

SOCKETS A AND B

1.

Reconnect power relay box to intercom power

supply harness to cable CX4720.

2.

Disconnect cable CX4720 from J508 connector

at amplifier AM 1780/VRC.

3.

Turn MASTER switch to ON.

4.

Place red multimeter lead in socket B and black

lead in socket A.

5.

Check for voltage.

Is battery voltage present?

J508

AMPLIFIER

AM 1780/VRC

+–