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 226 of 828

TM 9–2350–311–20–2

3–114

3–3

TROUBLESHOOTING — CONTINUED

i.

INTERCOMMUNICATION SYSTEM

— CONTINUED

(3)

DRIVER CANNOT COMMUNICATE.

— CONTINUED

CONTINUED FROM STEP N

CONTINUED ON NEXT PAGE

1.

Place one multimeter lead in socket H of J801 or

J804 connector and other lead to pin C of J803

connector.

2.

Check for continuity.

Is continuity present?

O

yes

no

Replace control box (para

8–16).

P

Check ground connection

of control box and repeat

step P. If malfunction per-

sists, replace control box

(para 8–16).

yes

no

1.

Place one multimeter lead in socket A of J801 or

J804 connector and other lead to ground.

2.

Check for continuity.

Is continuity present?

DRIVER’S CONTROL BOX

J801 OR

J804 CONNECTOR

SOCKET A

+–

DRIVER’S CONTROL BOX

+

J801 OR J804

CONNECTOR

SOCKET H

–

J803 CONNECTOR

PIN C