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 396 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

T

OO

I

S

General mechanic’s tool kit (item 64, Appx H)

Multimeters (item 36, Appx H)

TA-1 probe kit (item 43, Appx H)

A

1. Disconnect accessory control box-to-heater/

blower wiring harness from personnel

ventilation blower.

2. Place a jumper wire from socket B (lead

159A) to ground.

3. Place red lead of multimeters in socket A (lead

159C) and black lead to ground.

4. Turn MASTER switch ON, VENTILATOR

BLOWER switch in EXHAUST position

and check for voltage.

5. Place VENTILATOR BLOWER switch in

INTAKE position and check for voltage.

6. Turn MASTER and VENTILATOR

BLOWER INTAKE switches OFF.

Is voltage present in one position?

Go to step D.

CONTINUED ON NEXT PAGE

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