Service Manual

3-12
n
Whirlpool & Maytag Front-Load Dryers
COMPONENT TESTING
5. Motor Circuit Check - Access the ACU and measure the
resistance across J8-4 and J9-1.
¾ If resistance across J8-4 and J9-1 is in the range of 1 to
6 Ω, the motor circuit is acceptable. Replace the ACU.
¾ Otherwise, connue to step 6.
6. Check the wiring and components in the path between
these measurement points by referring to the appropriate
wiring diagram (gas or electric) on pages 3-4 to 3-7.
NOTE: To access motor system components, slide the top
back and remove the front panel.
ALL DRYERS: Check the thermal fuse. See TEST #4b:
Thermal Fuse, page 3-17.
ALL DRYERS: Connue with step 7 below to test the
remaining components in the motor circuit.
7. Check the drive motor and belt switch (gas dryer only).
Slowly remove the drum belt from the spring-loaded belt
switch pulley, gently leng the pulley down. See gure 1.
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
9. Reassemble all parts and panels.
10. Plug in dryer or reconnect power.
11. Perform steps under “Service Test Mode”,
page 3, to verify repair.
TEST #3: Motor Circuit
This test will check the wiring to the motor
and the motor itself. The following items are
part of this motor system:
NOTE: Refer to strip circuit on page 25
to diagnose drive motor.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Check for loose, worn, or damaged drum
belt—repair as necessary.
4. Door Switch problems can be uncovered
by following procedure under TEST #7:
Door Switch, page 22; however, if this was
not done, the following can be performed
without applying power to the dryer. Connect
an ohmmeter across ACU J8-3 (neutral, white
wire) and J8-4 (door, tan wire).
¾With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2 1).
¾If not, check harnesses and connections
between ACU and door switch. If good,
replace the door switch assembly.
5. Motor Circuit Check - Access the ACU and
measure the resistance across J8-4 and J9-1.
¾If resistance across J8-4 and J9-1 is in
the range of 1 to 6 1, the motor circuit is
acceptable. Replace the ACU.
¾Otherwise, continue to step 6.
6. Check the wiring and components in the path
between these measurement points by referring
to the appropriate wiring diagram (gas or electric)
on pages 26 or 27. NOTE: To access motor
system components, slide the top back and
remove the front panel.
ALL DRYERS: Check the thermal fuse. See TEST
#4b: Thermal Fuse, page 20.
Continue with step 7 below to test the remaining
components in the motor circuit.
7. Check the drive motor. Slowly remove the
drum belt from the spring-loaded pulley, gently
letting the pulley down. See figure 7.
8. Remove the white connector from the drive
motor switch. See figure 8.
Part of Motor System
Electric
Dryer
Gas
Dryer
Drum belt
üü
Door switch
üü
Harness/connection
üü
Thermal fuse
ü
Drive motor
üü
Centrifugal switch
üü
Machine control electronics
üü
ü
Figure 7 - Slowly remove drum belt.
Drum
Belt
Pulley
1
5
3
4
6
2
Figure 8 - Remove white connector.
White
Connector
Drive Motor Switch
Figure 1 - Slowly remove drum belt.
8. Remove the white connector from the drive motor switch.
See gure 2.
3$*(
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
9. Reassemble all parts and panels.
10. Plug in dryer or reconnect power.
11. Perform steps under “Service Test Mode”,
page 3, to verify repair.
TEST #3: Motor Circuit
This test will check the wiring to the motor
and the motor itself. The following items are
part of this motor system:
NOTE: Refer to strip circuit on page 25
to diagnose drive motor.
1. Unplug dryer or disconnect power.
2. Remove console to access the machine
electronics.
3. Check for loose, worn, or damaged drum
belt—repair as necessary.
4. Door Switch problems can be uncovered
by following procedure under TEST #7:
Door Switch, page 22; however, if this was
not done, the following can be performed
without applying power to the dryer. Connect
an ohmmeter across ACU J8-3 (neutral, white
wire) and J8-4 (door, tan wire).
¾With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2 1).
¾If not, check harnesses and connections
between ACU and door switch. If good,
replace the door switch assembly.
5. Motor Circuit Check - Access the ACU and
measure the resistance across J8-4 and J9-1.
¾If resistance across J8-4 and J9-1 is in
the range of 1 to 6 1, the motor circuit is
acceptable. Replace the ACU.
¾Otherwise, continue to step 6.
6. Check the wiring and components in the path
between these measurement points by referring
to the appropriate wiring diagram (gas or electric)
on pages 26 or 27. NOTE: To access motor
system components, slide the top back and
remove the front panel.
ALL DRYERS: Check the thermal fuse. See TEST
#4b: Thermal Fuse, page 20.
Continue with step 7 below to test the remaining
components in the motor circuit.
7. Check the drive motor. Slowly remove the
drum belt from the spring-loaded pulley, gently
letting the pulley down. See figure 7.
8. Remove the white connector from the drive
motor switch. See figure 8.
Part of Motor System
Electric
Dryer
Gas
Dryer
Drum belt
üü
Door switch
üü
Harness/connection
üü
Thermal fuse
ü
Drive motor
üü
Centrifugal switch
üü
Machine control electronics
üü
ü
Figure 7 - Slowly remove drum belt.
Drum
Belt
Pulley
1
5
3
4
6
2
Figure 8 - Remove white connector.
White
Connector
Drive Motor Switch
Figure 2 - Remove white connector
TEST #3: Motor Circuit
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 Electric Dryer Gas Dryer
Drum belt
ü ü
Door switch
ü ü
Harness/connecon
ü ü
Thermal fuse
ü ü
Drive motor
ü ü
Belt switch no
ü
Centrifugal switch
ü ü
ACU
ü ü
NOTE: Refer to strip circuit on page 3-13 to diagnose the drive
motor.
1. Unplug dryer or disconnect power.
2. Remove top panel to access the machine electronics.
3. Check for loose, worn, or damaged drum belt—repair as
necessary.
4. Door Switch problems can be uncovered by following
procedure under TEST #7: Door Switch, page 3-21;
however, if this was not done, the following can be
performed without applying power to the dryer. Connect
an ohmmeter across ACU J8-3 (neutral, white wire) and
J8-4 (door, tan wire).
¾ With the door properly closed, the ohmmeter should
indicate a closed circuit (0–2 Ω).
¾ If not, check harnesses and connecons between
ACU and door switch. If good, replace the door switch
assembly.
For Service Technician Use Only
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.