TECH SHEET - DO NOT DISCARD
PAGE 5
FOR SERVICE TECHNICIAN’S USE ONLY
PART NO. W10156037A
TEST #3
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 9.
➔
If resistance across P8-4 and P9-1 is in the
range of 1 to 6
Ω
, 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. See pages 11
and 12.
4.
Perform TEST #4b, page 7. If thermal fuse is
OK, continue with step 5.
5.
Check the belt switch and drive motor. Access
the belt switch and drive motor by removing the
front panel/drum assembly. See Removing the
Front Panel/Drum Assembly, page 9. Slowly
remove the drum belt from the spring-loaded belt
switch tension pulley, gently letting the pulley
down. See figure 5.
6.
Remove the white connector from the drive
motor switch. See figure 6.
7.
Remove the bare copper wire terminal from pin 5
of black drive motor switch. See figure 7.
8.
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 terminal removed
from pin 5 of black
drive motor switch
START
1.4–2.8
Blue wire in back at
pin 4 and bare copper
wire terminal 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 3
Ω
, replace the motor.
9.
Check the belt switch by measuring resistance
between the two blue wires as shown in figure 8,
while pushing up the belt switch tension 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.
10.
Door switch problems can be uncovered by
following procedure under DIAGNOSTIC: Door
Switch, 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
Ω
).
➔
If not, replace the door switch assembly. See
figure 11, page 8; and Removing the Front
Panel/Drum Assembly, page 9.
Belt Switch
Tension Pulley
Belt Switch
Drum Belt
Figure 5.
Slowly remove drum belt.
Drive Motor
Switch
White
Connector
Figure 6.
Remove white connector.
Main Winding:
Blue Wire in Back and Bare
Copper Wire (5 Position)
Start Winding:
Blue Wire in Back and Bare
Copper Wire (3 Position)
Figure 7.
Main and Start winding
measure points.
Blue Wires
(Back and 4 Position)
Belt Switch
Tension Pulley
Figure 8.
Checking the belt switch.
