Troubleshooting guide

PAGE 12
FOR SERVICE TECHNICIAN’S USE ONLY
DO NOT REMOVE OR DESTROY
7. Visually check that ALL connectors are fully
inserted into the CCU.
8. Visually check that ALL connectors are fully
inserted into the UI.
9. Reassemble all parts and panels.
10. Plug in dryer or reconnect power.
11. Perform steps under “Install Diagnostics”,
page 5, 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 21
to diagnose 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 19; however, if this was not
done, the following can be performed without
applying power to the dryer. Connect an
ohmmeter across CCU P8-3 (neutral, white
wire) and P8-4 (door, tan wire).
With the door properly closed, the ohmmeter
should indicate a closed circuit (0–2 Ω).
If not, check harnesses and connections
between CCU and door switch. If good,
replace the door switch assembly.
5. Motor Circuit Check - Access the CCU and
measure the resistance across P8-4 and P9-1.
If resistance across P8-4 and P9-1 is in
the range of 1 to 6 Ω, the motor circuit is
acceptable. Replace the CCU.
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 24 or 25. NOTE: To access motor
system components, refer to Dryer Disassembly
Instructions, page 22.
ELECTRIC DRYER ONLY: Check the thermal fuse.
See TEST #4b: Thermal Fuse, page 17.
ALL DRYERS: Continue with step 7 below to test
the remaining components in the motor circuit.
7. Check the drive motor and belt switch.
Slowly remove the drum belt from the spring-
loaded belt switch pulley, gently letting the belt
switch 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
��
Door switch
��
Harness/connection
��
Thermal fuse
�
no
Drive motor
��
Belt switch
��
Centrifugal switch
��
Machine control electronics
��
Figure 7 - Slowly remove drum belt.
Drum
Belt
Belt Switch Pulley
1
5
3
4
6
2
Figure 8 - Remove white connector.
White
Connector
Drive Motor
Switch