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 1187 of 1275

TM9-2350-311-20-1

GO 1 VTM CONNECTIONS AND CHECKOUT—

CONTINUED

4

RUN CONFERENCE TEST.

.

- Set TEST SELECT switches to 66,

press and release TEST button.

-

Wait

for readout of 0066 on VTM.

Does VTM display and hold 0066?

- PULL OFF VTM power switch.

- Repeat steps 2 and 4 one time.

Does VTM display and hold 0066?

Set TEST SELECT switches to 99, press

and release TEST button. Look for this

.

STE/lCE-R is bad;

display.

replace.

Check display to ensure that

0099 and .8.8.8.8 appear

correctly. If all segments of

display are not on, refer to TM

9-4910-571-12&P to replace

display module.

4

At this point in test, several numbers will

appear on display. Numbers displayed

Go to Figure 2,

indicate VTM is going through

sheet 5.

confidence test. You are looking for

disp!av and hold of PASS.

Figure 2, Sheet 4 of 20

I-10