Test #3: Motor Circuit - Whirlpool WFC8090GX Service Manual

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 #3: Motor Circuit

This test checks the motor, ACU, and wiring.
1. Check the motor and electrical connections by
performing the Service Diagnostic Mode Tests on page
2-3. IMPORTANT: Door must be closed and locked to
run motor. The following steps assume that this step was
unsuccessful.
2. Unplug washer/dryer or disconnect power.
3. Check to see if basket will turn freely.
¾ If basket turns freely, go to step 4.
¾ If basket does not turn freely, determine what is
causing the mechanical friction or lockup.
4. Gently lay washer/dryer on its right side to access the ACU
and MCU. Remove AC shield, ACU cover, and MCU cover.
5. Visually check that connectors J3 and J17 are inserted all
the way into the ACU.
¾ If visual checks pass, go to step 6.
¾ If visual checks fail, reconnect J3 and J17, set unit
upright and repeat step 1.
6. Visually check that MCU connectors J2A, J3, and J4A are
inserted all the way into the MCU (see Figure 1).
¾ If visual checks pass, go to step 7.
¾ If visual checks fail, reconnect J2A, J3, and J4A, set unit
MOTOR
upright and repeat step 1.
MOTOR
For Service Technician Use Only
ACU
MCU
J36-1
J4A-1
6 - 20 Ω J36-2
J4A-2
J36-3
J4A-3
Figure 2 - Direct Drive Motor Strip Circuit
7. Check the motor windings. Disconnect the motor harness
J4A from the MCU (see Figure 2). With an ohmmeter,
verify the resistance values as shown in following table:
Motor Harness
J4A, Pins 1 & 2
J4A, Pins 2 & 3
J4A, Pins 1 & 3
¾ If the values are outside the range or open, replace
stator assembly and retest; otherwise, reconnect the
motor harness J4A to MCU and go to step 8.
8. Check harness continuity between ACU-J3 to MCU-J2A,
and ACU-J17 to MCU-J3.
¾ If any harness fails the continuity check, replace
harness and retest. Otherwise, reconnect harnesses
and go to step 9.
9. Plug in washer/dryer or reconnect power.
10. Run the Service Diagnostic Mode Tests on page 2-3.
IMPORTANT: Door must be closed and locked to run
motor.
11. The motor should be powered and moving. If it is not,
replace the MCU.
12. If the preceding steps did not correct the motor problem,
replace the ACU.
¾ Unplug washer/dryer or disconnect power.
¾ Replace the ACU.
¾ Reassemble all parts and panels.
¾ Perform the Service Diagnostic Mode Tests on page 2-3
to verify repair.
J4A -To Stator Motor
J3 - From ACU J17
- Comm/LV/GND
R
BU
6 - 20 Ω
BU
W
6 - 20 Ω
W
R
Whirlpool Smart All-In-One Washer & Dryer
COMPONENT TESTING
Windings
6-20 W
6-20 W
6-20 W
J2A - From ACU J3
- AC IN from Door Lock
Figure 1
MOTOR
STATOR
MOTOR
3-7
n