TM-9-2350-311-20-1

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

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 400 of 1275

TM 9-2350-311 -20-1

3-3 TROUBLESHOOTING CHART —

CONTINUED

aa. PERSONNEL VENTILATION BLOWER CIRCUIT —

PERSONNEL VENTILATION BLOWER FAILS TO

CONTINUED

OPERATE — CONTINUED

CONTINUED FROM STEP G

H

1. Reconnect lead 10 to accessory control b

OX

.

2. Remove accessory control box cover (para 8-

20).

2. Disconnect lead 10A from circuit breaker

input.

3. Place red lead of multimeters in lead 10 and

black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

I Is voltage Present?

Repair or replace lead 10/10A of

accessory control box wiring

harness (para 8-53).

1. Reconnect lead 10A to circuit breaker input.

2. Disconnect lead 159 from circuit breaker

output.

3. Place red lead of multimeters in circuit breaker

output and black lead to ground.

4. Turn MASTER switch ON and check for

voltage.

5. Turn MASTER switch OFF.

Is voltage present?

Replace circuit breaker (para 8-20).

CONTINUED ON NEXT PAGE

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