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 373 of 1275

TM 9-2350-311-20-1

(1) ONE OR MORE INSTRUMENT PANEL LIGHTS FAIL

TO OPERATE

INITIAL SETUP

Tools

. .

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

Portable instrument panel cover removed (para 8-17)

Multimeters (item 36, Appx H)

Driver’s instrument panel released (para 8-17)

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

Before troubleshooting instrument panel lights, be sure

that service drive lights are operational. The following

procedure applies to both portable and driver’s

instrument panels and accessory control box lights.

m

A

1. Remove inoperative panel light bulb

(para 8-17).

2. Place red lead of multimeters in center contact

of socket and black lead to ground.

3. Turn MASTER switch ON, instrument panel

light switch on, and check for voltage.

4. Turn MASTER and instrument panel light

switches OFF.

Is voltage present?

I

Replace panel light bulb (para 8-1 7).

For portable instrument panel, go to step B.

For driver’s instrument panel, go to step F.

For accessory control box, go to step D.

3-273

NOTE