Whirlpool MVWC400XW Technical Education page 77

to J16-5 (N), red probe to J16-7 (CCW Winding).
If 120VAC is cycling ON during CCW

rotation, go to step 9.
TROUBLESHOOTING GUIDE (continued)
If 120VAC is not present, go to Test #1:

Main Control, page 12.
FOR SERVICE TECHNICIANS ONLY
9. Unplug washer or disconnect power.
9. Unplug washer or disconnect power.
10. Remove connector J16 from main
10. Remove connector J16 from main control.
control. With an ohmmeter, verify resistance
With an ohmmeter, verify resistance
values shown below across the following J16
values shown below across the following
connector pinouts:
J16 connector pinouts:
Motor Winding
CW Winding
CCW Winding
Resistance should be between 3.5 and 6 Ω .
If values are open or out of range, go to step 11.

If values are open or out of range, go to step 11.

If values are correct, go to step 15.
If values are correct, go to step 15.

If values are correct, go to step 15.

Main Control
11. Tilt washer back to access the bottom
11. Tilt washer back to access the bottom
11. Tilt washer back to access the bottom
L1
of the washer and the drive motor area. of the washer and the drive motor area.
of the washer and the drive motor area.
J16-6
12. Visually check the mounting bracket and
12. Visually check the mounting bracket and
12. Visually check the mounting bracket and
CW TRIAC
electrical connections to the motor and shifter. J7-1
electrical connections to the motor and
electrical connections to the motor and shifter.
CCW TRIAC
shifter.
If visual check passes, go to step 13.

If visual check passes, go to step 13.
J16-7

If visual check passes, go to step 13.
If connections are loose, reconnect the

If connections are loose, reconnect the

If connections are loose, reconnect the
electrical connections, reassemble motor
electrical connections, reassemble motor
electrical connections, reassemble motor
cover, and repeat step 1.
cover, and repeat step 1.
cover, and repeat step 1.
13. With an ohmmeter, check the harness
13. With an ohmmeter, check the harness
13. With an ohmmeter, check the harness for
for continuity between the main control, motor,
for continuity between the main control, motor, continuity between the main control, motor,
and run capacitor using the following test
and run capacitor using the following test
and run capacitor using the following test
points. See chart.
points. See chart.
points. See chart.
Motor Harness Check
Motor Harness Check
Motor Connector Pin-1 to Chassis Ground
Motor Connector Pin-1 to Chassis Ground
Motor Connector Pin-3 to Main Control J16-7
Motor Connector Pin-3 to Main Control J16-7
Motor Connector Pin-3 to Run Capacitor Pin-3
Motor Connector Pin-3 to Run Capacitor Pin-3
Motor Connector Pin-6 to Main Control J16-6
Motor Connector Pin-6 to Main Control J16-6
Motor Connector Pin-6 to Run Capacitor Pin-1
Motor Connector Pin-6 to Run Capacitor Pin-1
Motor Connector Pin-9 to Main Control J16-5
Motor Connector Pin-9 to Main Control J16-5
If there is continuity, go to step 14.

If there is continuity, go to step 14.

If there is continuity, go to step 14.
If there is no continuity, replace the lower

If there is no continuity, replace the lower

If there is no continuity, replace the lower
machine harness and repeat step 1.
machine harness and repeat step 1.
machine harness and repeat step 1.
14. With an ohmmeter, check the motor
14. With an ohmmeter, check the motor
14. W ith a n o hmmeter, c heck t he m otor w indings
windings at the following motor connections.
windings at the following motor connections.
at the following motor connections.
Motor Winding
Motor Winding
CW Winding
CW Winding
CCW Winding
CCW Winding
Resistance should be between 3.5 and 6 Ω .
Resistance should be between 3.5 and 6 Ω .
Resistance should be between 3.5 and 6 Ω.
If values are open or out of range, replace

If values are open or out of range, replace

motor.
If values are open or out of range, replace
motor.
motor.
If values are correct, go to step 15.

If values are correct, go to step 15.

If values are correct, go to step 15.
J16 Connector Pinout
J16, 5 & 6
J16, 5 & 7
PSC Motor
Pin 6
1
CW Winding
Run
Cap
CCW Winding
3
Pin 3
Each Winding 3.5 to 6 ohms
Figure 5 - PSC Motor Strip Circuit (shown in ON position)
Motor Pinout
Motor Pinout
Pins 4 & 6
Pins 4 & 6
Pins 3 & 6
Pins 3 & 6
machine harness and repeat step 1.
14. With an ohmmeter, check the motor
windings at the following motor connections.
Motor Winding
CW Winding
CCW Winding
15. Test Motor Run Capacitor. NOTE: A faulty
Resistance should be between 3.5 and 6 Ω .
capacitor may cause the motor to "hum",
If values are open or out of range, replace

not start, or turn slowly.
motor.
a. Disconnect one wire terminal from the
If values are correct, go to step 15.

capacitor.
b. Discharge capacitor by placing a resistance
across the terminals.
c. With an ohmmeter, measure across the
terminals and note reading.
If a steady increase in resistance is noted,
continue to step 16.
If the capacitor is either shorted or open,
replace capacitor, calibrate, and repeat
step 1.
Main Control
16. If the preceding steps did not correct the
J15-4
J16-5
Pin 9
motor problem, replace the main control.
Lock Switch
Pin 1
a. Unplug washer or disconnect power.
b. Replace the main control.
c. Reassemble all parts and panels.
d. Plug in washer or reconnect power. Calibrate
washer and perform Automatic Test to
verify repair.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before
operating.
Failure to do so can result in death or
electrical shock.
TEST #4: Console and Indicators
Console and Indicators Check:
This procedure checks the cycle selector
knob, indicators, buttons, beeper, and if it
exists—the 7-segment display.
1. Plug in washer or reconnect power.
6-10
Motor Pinout
Pins 4 & 6
Pins 3 & 6
N
Main Control
J15-3 J7-3