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TM 10-3930-631-34
waveshape (fig. 9-7). Replace defective circuit control
switch module or defective conduction limit circuit in the
control board, defective power
switch module or
(e) Shorted drive regulator input.  Disconnect
defective drive regulator could exist.
the white wire from the S1 terminal of  the #1 drive
9-9. Drive Regulator Module Test
regulator.  Remove the S1 bus bar  (fig.  9-6) from
a. Connect the positive lead of a voltmeter or
between the drive regulator modules. Connect one end
oscilloscope to the test point (1) (fig. 9-6) on the first
of a jumper to the white wire and connect the other end
drive regulator module. Connect the negative lead to
to each drive  regulator terminal and individually and
the test point (2).
observe wave form (fig. 9-7) to determine if the module
(1) Sit on the operator's seat.
is shorted. Replace defective drive regulator module
(2) Turn the key switch to ON.
(3) Place the forward and reverse switch into a
c.  If the pulse width does not vary with ac-
direction.
celerator depression, a defective conduction limit circuit
(4) Depress  the  accelerator  sufficiently  to
in the control board, defective power
energize the contactor.
b. The meter should read 1.0 + 0.1 volts or the
wave form should be as shown on figure 9-8. Repeat
this check on all drive regulator modules and replace
defective modules (para. 9-28).
VERTICAL 0.1V/CM
HORIZONTAL 0.1MS/CM
SWITCH:
VERTICAL 0.5V/CM OR 1.0V/CM
HORIZONTAL 1MS/CM
S1 NOT CONNECTED
S1 CONNECTED
0.3V-
2.0V
0.2V-0.1V-
2 PULSES SHOWN
1 PULSE SHOWN
0.1V-
FREQUENCY WILL
FREQUENCY WILL
0V-
BE 3 TO 5 KHZ
0V
BE 300 HZ
Figure 9-8. Wave forms for drive regulator module.
c.  Connect the positive lead of a voltmeter or
frequency, and it will be pulse width modulated. Repeat
this check for each drive regulator module and replace
oscilloscope to the D1 terminal (fig. 9-6) on the first
defective drive regulator modules.
drive regulator.  Connect the negative lead to  B-.
Disconnect the white wire from the S1 terminal and the
9-10.  Drive Current Test
S1 bus bar from the drive regulator. Connect a jumper
a. Connect a current shunt on the battery leads.
wire to the white wire.
Use a scope to measure the peak locked motor current
(1) Sit on the operator's seat.
as follows:
(2) Turn the key switch to ON.
(1) Sit on operator's seat.
(3) Place the forward and reverse lever into a
(2) Turn key switch to ON.
direction.
(3) Set the forward and reverse lever into a
(4) Depress  the  accelerator  sufficiently  to
direction.
energize the contactor.
(4) Apply the brake.
d. The voltage on the meter should be less than
(5) Depress the accelerator completely.
0.40 volts or the wave form should be as shown on
(6) The peak current should be 600 amperes
figure 9-8.  Apply the white wire jumper to the S1
minimum.
terminal. The magnitude will be approximately 2.0 volts,
b. When using an oscilloscope to check current
the frequency will be the control board
limit the prime consideration is the peak of the
9-13

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