6. Using Figure 9, check for the resistance
values of the motor’s Main and Start
winding coils as shown below.
NOTE: Main and Start winding coils must
be checked at the motor.
WINDING RESISTANCE
CONTACT POINTS
(Ω)
OF MEASUREMENT
Lt. blue wire in back at
pin 4 and bare copper
MAIN
2.4–3.6 Ω
wire on pin 5 of black
drive motor switch
Lt. blue wire in back at
pin 4 and bare copper
START
2.4–3.8 Ω
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.
7. Check the belt switch by measuring resis-
tance between the two light blue wires, as
shown in Figure 10, while pushing up the
belt switch pulley.
Lt. Blue
Wires
Belt Switch
Belt Switch
Pulley
Figure 10.
Checking the belt switch.
•
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.
•
If the Start winding is in question and the
resistance is much greater than 4 ohms,
replace the motor.