Maytag MAH5500BWW Service Manual - Page 28

Motor & Motor Contr, Motor & Motor Control T, ol Test, Motor Phase T, Motor Phase Test - problems

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Motor & Motor Control Test 1. Set the timer knob into the delay increments. 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 machine 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 harness on front end of motor control board. 6. Plug the washer power cord into a 120 VAC power source. The motor control will immediately execute a test routine and the motor should run, rotating the spinner at 50 rpm. 6. If the motor runs, and the spinner rotates 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 connector to the motor control. 7. 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 motor control/wire harness assembly (Figure 2-6). B. If the fuse is functioning, visually check the six semiconductors on the heat sink for any damage. If damaged, replace motor control/wire harness assembly complete and check motor windings for damage (See Drive Motor). Replace motor if necessary(Figure 2-6) . C. If fuse and semiconductors show no visible damage, perform the motor phase test. 8. Unplug the washer power cord and replace motor control board connector JP4 when finished. Figure 2-6 Motor Phase Test It is possible for the motor to still run under light loads when one of the phases of the motor is nonfunctional. One possible symptom would be a "growling" noise from the motor. Torque is decreased when the motor is out of phase. This could result in a customer complaint that the load is not spinning out properly or it does not tumble consistently with a large load (See Section 3: Troubleshooting). 16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING 2 - 8 © 1998 Maytag Corporation

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© 1998 Maytag Corporation
16008373-01
SECTION 2.
ELECTRICAL COMPONENTS & TESTING
2-8
2-8
2-8
2-8
2-8
Motor & Motor Contr
Motor & Motor Contr
Motor & Motor Contr
Motor & Motor Contr
Motor & Motor Control T
ol T
ol T
ol T
ol Test
est
est
est
est
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.
6.
If the motor runs,
If the motor runs,
If the motor runs,
If the motor runs,
If the motor runs, and the spinner rotates
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).
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).
(See Drive Motor).
Replace motor if
necessary
(Figure 2-6)
(Figure 2-6)
(Figure 2-6)
(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 T
Motor Phase T
Motor Phase T
Motor Phase Test
est
est
est
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: T
(See Section 3: T
r
ouble-
ouble-
ouble-
ouble-
ouble-
shooting).
shooting).
shooting).
shooting).
shooting).