TM-9-2320-272-23-2
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 2 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-2 - Page 288 of 1417
DC VOLTAGE TEST - Continued
T0013DAA
Figure 2.
CAL Prompt Message.
e.
Release test.
f.
Wait for offset value to appear on display.
CONDITION/INDICATION
Is offset value within limits of -6.8 to +6.8?
DECISION
YES - Go to Step (2).
NO - STE/ICE bad, replace.
STEP
NOTE
DC VOLTAGE (TEST 89). This test allows VTM to be used as a voltmeter. Voltmeter is
automatically ranged (autoranged) through three voltage ranges: 0-0.5 volt, 0-4.5 volts, and
0-45 volts DC. Decimal point will automatically move to correct position. Each time you want
to make a measurement, connect read lead to positive (+) side and black lead to negative (-)
side of cable or item being tested. If polarity is reversed, you will get a minus (-) sign in readout;
numerical value is correct.
2.
Connect test equipment.
a.
Connect red clip lead to voltage test point. This is positive (+) point if a + voltage is being tested.
b.
Connect black clip lead to ground.
STEP
3.
Perform voltage test.
a.
Turn ON circuit if voltage is not voltage is not already present.
b.
Press TEST.
c.
If VTM reads .9.9.9.9, voltage measured is greater than 45 volts.
CONDITION/INDICATION
Displaced value is the test result.
DECISION
END OF WORK PACKAGE
TM 9-2320-272-23-2
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