Service Manual

COMPONENT TESTING
Whirlpool Smart All-In-One Washer & Dryer
n
3-7
For Service Technician Use Only
TEST #3: Motor Circuit
This test checks the motor, ACU, and wiring.
1. Check the motor and electrical connecons by
performing the Service Diagnosc 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 fricon 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
upright and repeat step 1.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Failure to do so can result in death or
electrical shock.
Replace all parts and panels before operating.
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 Windings
J4A, Pins 1 & 2 6-20 W
J4A, Pins 2 & 3 6-20 W
J4A, Pins 1 & 3 6-20 W
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 connuity between ACU-J3 to MCU-J2A,
and ACU-J17 to MCU-J3.
¾ If any harness fails the connuity 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 Diagnosc 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 Diagnosc Mode Tests on page 2-3
to verify repair.
MOTOR
Figure 2 - Direct Drive Motor Strip Circuit
ACU
MOTOR
MOTOR
J36-2
J36-1
BU
J36-3
W
R
6 - 20 Ω
6 - 20 Ω
6 - 20 Ω
Figure 1
J4A-1
J4A-2
J4A-3
J4A -To Stator Motor
J2A - F r o m A C U J 3
- AC IN from Door Lock
J3 - From ACU J17
- Comm/LV/GND
MCU
BU
R
W
STATOR
MOTOR