Whirlpool MAT20CS Manual page 15

4. Remove console to access main control.
5. Visually check that the J2 and J16 connectors are inserted
all the way into the main control.
 If visual checks pass, go to step 6.
 If connectors are not inserted properly, reconnect J2 and J16
and repeat step 1.
6. Plug in washer or reconnect power. Run the Gentle Agitation
test under Manual Overview Test Mode on page 9.
7. With a voltmeter set to AC, connect black probe to motor
relay pin 2 and red probe to J16-7 (CCW Winding).
 If line voltage is cycling ON during CCW rotation, go to step 8.
 If line voltage is not present, go to Test #1: Main Control,
page 12.
8. With a voltmeter set to AC, connect black probe to motor
relay pin 2, red probe to J16-6 (CW Winding).
 If line voltage is cycling ON during CW rotation, go to step 9.
 If line voltage is not present, go to Test #1: Main Control,
page 12.
9. Unplug washer or disconnect power.
10. Remove connector J16 from main control. With an
ohmmeter, check resistance of motor windings across the
following J16 connector pinouts:
Size Motor Winding
CCW Winding
1/2 HP
CW Winding
 If values are open or out of range, go to step 11.
 If values are correct, go to step 15.
11. Tilt washer back to access drive system.
12. Visually check the mounting bracket and electrical
connections to the motor and shifter.
Main Control
L1
CW TRIAC
J7-1
CCW TRIAC
DO NOT REMOVE OR DESTROY
FOR SERVICE TECHNICIAN'S USE ONLY
J16 Pinout Resistance
J16-7 to motor
13 to 15.5
relay pin 2
J16-6 to motor
13 to 15.5
relay pin 2
J16-6 Pin 4
1
Run
Cap/
Inductor
3
Pin 3
J16-7
Figure 5 - Motor Strip Circuit (shown in ON position)
 If visual check passes, go to step 13.
 If connections are loose, reconnect the electrical
connections, reassemble motor cover, and repeat step 1.
13. With an ohmmeter, check the harness for continuity
between the main control, motor, and run capacitor
using the following test points.
Motor Harness Check
Motor Connector Pin 1 to Chassis Ground
Motor Connector Pin 3 to Main Control J16-7
Motor Connector Pin 3 to Run Capacitor Pin 3
Motor Connector Pin 4 to Main Control J16-6
Motor Connector Pin 4 to Run Capacitor Pin 1
Motor Connector Pin 2 to Motor Relay Pin 2
 If there is continuity, go to step 14.
 If there is no continuity, replace the lower machine harness
and repeat step 1.
14. With an ohmmeter, check resistance of motor windings
at the following motor connections.
Size Motor Winding
CCW Winding
1/2 HP
CW Winding
 If values are open or out of range, replace motor.
 If values are correct, go to step 15.
15. Test Motor Run Capacitor. NOTE: A faulty capacitor may
cause the motor to "hum", not start, or turn slowly.
a. Discharge the capacitor by touching the leads of a 20,000 Ω
resistor to the two terminals.
b. Disconnect the wires from the capacitor terminals.
c. With an ohmmeter, measure across the terminals and note
reading.
 If a steady increase in resistance is noted, continue to step 16.
Drive Motor
CW Winding
Pin 2,6
Pin 2
CCW Winding
Pin 1
Pin 1
Pin 0
Motor Pinout
Pins 3 & 2
Pins 4 & 2
Motor Relay
Pin 1
J16-4
Pin 8 Pin 6
Pin 4 Pin 2
Resistance
13 to 15.5
13 to 15.5
N
Main Control
J7-3
15