TECH SHEET - DO NOT DISCARD PAGE 7
FOR SERVICE TECHNICIAN’S USE ONLY PART NO. W10035270
12. Plug in dryer or reconnect power.
13. Perform the Console Buttons and
Indicators Diagnostic test, page 1, to
verify repair.
14. If indicators still do not light, the
machine control electronics has failed:
➔
Unplug dryer or disconnect power.
➔
Replace the machine control
electronics.
➔
Plug in dryer or reconnect power.
➔
Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
TEST #2 Machine Control
Power Check
This test is used to determine if power is
present at the machine control electronics.
NOTE: The drum light is controlled by the
machine control on all models.
1. Plug in dryer or reconnect power.
2. Open the door.
➔
If the drum light illuminates, then
power is present at the machine
control. Go to TEST #6, page 10.
➔ If the drum light fails to illuminate,
do not assume the machine control
electronics needs replacement.
Several conditions may cause the
drum light not to illuminate, including
a bad bulb. If the drum light does not
illuminate, go to TEST #1, page 6.
TEST #3a Drive Motor Circuit
This test will check the wiring to the motor
and the motor itself. The following items are
part of this motor system:
–
Harness/
connection
–
Thermal fuse
–
Belt/belt switch
–
Drive motor
–
Centrifugal switch
–
Door switch
–
Machine control
electronics. See
ESD information,
page 1.
1. Unplug dryer or disconnect power.
2. Access the machine control electronics
and measure the resistance across P8-4
and P9-1. See Accessing & Removing the
Electronic Assemblies, page 11.
➔
If resistance across P8-4 and P9-1 is in
the range of 1 to 6 ohms, replace the
machine control electronics.
➔
Otherwise, go to step 3.
3. Check the wiring and components in the
path between these measurement points
by referring to the appropriate wiring
diagram and strip circuit, pages 4 and 5.
4. Check the thermal fuse. See TEST #4b,
page 9.
5. Check the belt switch and drive motor.
Access the belt switch and drive motor by
removing the back panel. See Removing
the Back Panel, page 12. Slowly remove
the drum belt from the spring-loaded belt
switch pulley, gently letting the belt switch
pulley down. See figure 5.
6. Remove the white connector from the
drive motor switch. See figure 6.
7. Using figure 7, check for the resistance
values of the motor’s Main and Start
winding coils as shown in the following
table.
NOTE: Main and Start winding coils must
be checked at the motor.
WINDING RESISTANCE
Ω
CONTACT POINTS OF
MEASUREMENT
MAIN
1.4–2.6
Blue wire in back at
pin 4 and bare copper
wire on pin 5 of black
drive motor switch
START
1.4–2.8
Blue wire in back at
pin 4 and bare copper
wire on pin 3 of black
drive motor switch
➔
If the resistance at the motor is correct,
there is an open circuit between the
motor and machine control
electronics. Check for failed belt
switch.
➔
If the Start winding resistance is much
greater than 4 ohms, replace the motor.
8. Check the belt switch by measuring
resistance between the two blue wires as
shown in figure 8, while pushing up the
belt switch pulley.
➔
If the resistance reading goes from
infinity to a few ohms as pulley arm
closes the switch, belt switch is OK.
If not, replace the belt switch.
➔
If belt switch is OK and there is still an
open circuit, check and repair the
wiring harness.
9. Door switch problems can be uncovered
in the Door Switch Diagnostic Test, page 1;
however, if this was not done, the
following can be done without applying
power to the dryer. Connect an ohmmeter
across 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 ohms).
➔
If not, replace the door switch
assembly. See figure 12, page 11; and
Removing the Front Panel/Drum
Assembly, page 11.
Drum
Belt
Tension
Pulley
Figure 5. Slowly remove drum belt.
2
6
4
3
5
1
Drive Motor
Switch
White
Connector
Figure 6. Remove white connector.
2
6
4
3
5
1
Main Winding:
and Bare Copper Wire (5 position)
Blue Wire in Back
Start Winding:
Blue Wire in Back
and Bare Copper
Wire (3 position)
Figure 7. Main and start winding
measure points.
2
6
4
3
5
1
Belt Switch
Tension
Pulley
Blue Wires
(Back and 4 position)
Figure 8. Checking the belt switch.
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