Test #3 Motor Circuit (M) - Whirlpool 4.3 CU FT Service Manual

COMPONENT TESTING
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 (M)

This test will check the wiring to the motor and the motor
itself. The following items are part of this motor system:
Part of Motor System
Drum belt
Door switch
Harness/connection
Drive motor
Appliance Control Unit (ACU)
NOTE: Verify motor movement in steps S02 and S03 of Service
Test Cycle (page 4). If no motor movement, proceed with the
following procedure.
1. Unplug dryer or disconnect power.
2. Remove top panel, left side panel, and console to access
the machine electronics.
3. Door Switch problems can be uncovered by following
procedure under TEST #7: Door Switch, page 20; however,
the door switch is inside the ACU and no port is available.
MOTOR
MOTOR STRIP CIRCUIT
L1
ACU
RELAY K6
BK BK
J13-1
RFI-2
n
3-8 Whirlpool Compact Heat Pump Dryer
For Service Technician Use Only
Heat Pump Dryer
ü
ü
ü
ü
ü
MOTOR CONTROL
GY
J12-2 1
VCC
GY
J12-3
2
IN/OUT
GY
J12-4
3
GND
BU
J4-1 2
L1
Figure 1 - Motor Strip Circuit
4. Check the wiring and components:
a. Check for loose, worn, or damaged drum belt—repair
as necessary.
b. Verify that the spring and support structure is in
position and in good condition.
c. Make sure there is no obstruction to drum movement.
Check J12 and J4 connections on ACU to motor.
d. Check continuity. If there is no continuity, replace the
wiring harness. If there is continuity, replace the drive
motor.
5. If the preceding steps do not correct the problem, replace
the ACU.
6. Reassemble all parts and panels.
7. Plug in dryer or reconnect power.
8. Perform the Service Test Cycle on pages 3 and 4 to verify
repair.
Motor Assembly
Blower Motor
Screw Assembly
Blower Motor
Wheel Bracket
M
MOTOR
BU
1
L2
Idler
Pulley
Belt Tension Motor
Spring Bracket
ACU
RELAY K5
J4-2
J13-2
Drum
Belt
L2
R R
RFI-1