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 222 of 828

TM 9–2350–311–20–2

3–110

3–3

TROUBLESHOOTING — CONTINUED

i.

INTERCOMMUNICATION SYSTEM

— CONTINUED

(3)

DRIVER CANNOT COMMUNICATE.

— CONTINUED

A

B

C

D

E

F

G

K

L

M

N

P

A

B

E

F

G

H

J

K

L

M

N

P

A

B

C

D

E

F

G

H

J

K

L

M

N

P

1.

Reconnect cable CX9640 connector to power

system wiring harness connector.

2.

Disconnect cable CX9640 from

telephone/intercom wiring harness connector in

driver’s compartment of hull.

3.

Place one multimeter lead on wire 41 terminal

and other lead in socket A of telephone/intercom

wiring harness connector.

4.

Check for continuity.

Is continuity present?

CONTINUED ON NEXT PAGE

CONTINUED FROM STEP E

yes

no

F

–

TELEPHONE/INTERCOM WIRING

HARNESS CONNECTOR SOCKET A

1.

Place one multimeter lead on wire 42 terminal

and other lead in socket B of telephone/intercom

wiring harness connector.

2.

Check for continuity.

Is continuity present?

G

yes

no

1.

Place one multimeter lead on wire 43 terminal

and other lead in socket C of telephone/intercom

wiring harness connector.

2.

Check for continuity.

Is continuity present?

H

Repair or replace wire 42

(TM 9–2350–311–20–1).

CONTACT

ARM

ASSEMBLY

TELEPHONE/INTERCOM WIRING

HARNESS CONNECTOR SOCKET B

TELEPHONE/INTERCOM WIRING

HARNESS CONNECTOR SOCKET C

Repair or replace wire 41

(TM 9–2350–311–20–1).

+

–

–