Motor Phase Test - Maytag Neptune MAH3000 Service Manual

Motor & Motor Contr Motor & Motor Contr Motor & Motor Control T Motor & Motor Contr Motor & Motor Contr
1. Set the timer knob into the delay incre-
ments.
2. Press the push-to-start switch to start the
washer in the delay mode. Confirm the
delay light is ON.
3. Check for 120 VAC between the L and N
terminals (black wire no.27 and white wire
no. 13) on the motor control board. If not
present, check wiring between the ma-
chine control and the motor control
boards.
4. Unplug the washer power cord. Test cord
to the same board terminals.
5. Remove JP4 Interface connector wire har-
ness on front end of motor control board.
6. Plug the washer power cord into a 120 VAC
power source. The motor control will im-
mediately execute a test routine and the
motor should run, rotating the spinner at
50 rpm.
Figure 2-6 Figure 2-6 Figure 2-6 Figure 2-6 Figure 2-6
16008373-01
ol Test ol T ol T ol T est est est est
© 1998 Maytag Corporation
If the motor runs, If the motor runs,
6. If the motor runs, If the motor runs, and the spinner rotates If the motor runs,
at the proper RPM speed, the problem lies
outside of the motor and motor control
circuit. Disconnect power to the washer
and reconnect the JP4 Interface connec-
tor to the motor control.
7. If the motor does not run: If the motor does not run: If the motor does not run: If the motor does not run: If the motor does not run:
A. Check the 10-amp fuse located on the
control board, either visually or with an
ohm meter. If bad, completely replace mo-
tor control/wire harness assembly
(Figure 2-6). (Figure 2-6). (Figure 2-6). (Figure 2-6). (Figure 2-6).
B. If the fuse is functioning, visually check
the six semiconductors on the heat sink
for any damage. If damaged, replace mo-
tor control/wire harness assembly com-
plete and check motor windings for dam-
age (See Drive Motor). (See Drive Motor). (See Drive Motor). (See Drive Motor). Replace motor if (See Drive Motor).
(Figure 2-6) (Figure 2-6) (Figure 2-6)
necessary (Figure 2-6) (Figure 2-6)
C. If fuse and semiconductors show no
visible damage, perform the motor phase
test.
8. Unplug the washer power cord and re-
place motor control board connector JP4
when finished.
Motor Phase T

Motor Phase Test

Motor Phase T est est est
Motor Phase T Motor Phase T est
It is possible for the motor to still run under
light loads when one of the phases of the
motor is nonfunctional. One possible symp-
tom would be a "growling" noise from the
motor. Torque is decreased when the motor
is out of phase. This could result in a cus-
tomer complaint that the load is not spinning
out properly or it does not tumble consistently
with a large load (See Section 3: T (See Section 3: T (See Section 3: T (See Section 3: Tr r r r r ouble- (See Section 3: T
shooting). shooting). shooting). shooting). shooting).
SECTION 2. ELECTRICAL COMPONENTS & TESTING
. . . . .
ouble- ouble- ouble- ouble-
2-8 2-8 2-8 2-8 2-8