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 502 of 828

TM 9–2350–311–20–2

8–78

8–16 AMPLIFIER AND CONTROL BOX — CONTINUED

a.

Removal

NOTE

Check with unit communications personnel before removal or installation of the intercommunica-

tions system.

1

Disconnect four electrical connectors (1) on amplifier AM1780/VRC (2) at J504, J508, J506, and J505.

2

Remove four hex nuts (3), four lockwashers (4), amplifier AM1780/VRC (2), and shock mounts (5). Discard

lockwashers.

3

Disconnect three electrical connectors (6) from control box (7) at J804, J802, and J803.

4

Remove four hex nuts (8) and remove four lockwashers (9) to remove control box (7). Discard lockwashers.

b.

Installation

1

Install control box (7) using four new lockwashers (9) and four hex nuts (8).

2

Connect three electrical connectors (6) to control box (7) at J804, J802, and J803.

3

Install shock mounts (5), amplifier AM1780/VRC (2), four new lockwashers (4) and four hex nuts (3).

4

Connect four electrical connectors (1) to amplifier AM1780/VRC (2) at J504, J508, J506, and J505.

3

4

5

2

1

8

9

6

7