Test #6A: Drive Motor/Capacitor - Amana L-90 Service Manual

TESTING COMPONENT
DANGER
Electrical Shock Hazard
Only authorized technicians should perform
diagnostic voltage measurements.
After performing voltage measurements,
disconnect power before servicing.
Failure to follow these instructions can result in
death or electrical shock.

TEST #6a: Drive Motor/Capacitor

This test checks the motor, motor windings, wiring, & start
capacitor.
NOTE: Refer to Figure 1, "Drive Motor Strip Circuit" below
for tests and measurements and Figure 2, for "Drive System
Components".
IMPORTANT: The tub must be empty of clothes and water
before running this test.
1. Check the motor and electrical connections by performing
the CW and CCW rotation of the motor under the
"Manual Load Test" on page 2-3. The following steps
assume that this step was unsuccessful.
2. Unplug washer or disconnect power.
3. Check drive belt and pulleys. Replace or repair as necessary.
4. Check to see if basket will turn freely.
¾ If basket turns freely, go to step 5.
¾ If basket does not turn freely, determine what is
causing the mechanical friction or lockup.
5. Access the UI/Control Board.
6. Visually check that the CN2 connector is inserted all the
way into the main control
¾ If visual checks pass, go to step 7.
¾ If connector is not inserted properly, reconnect CN2
and repeat step 1.
MOTOR & CAPACITOR
DRIVE MOTOR
L1 MAIN BOARD
BK
CN1-1
3-10 Amana Compact Washer
n
For Service Technician Use Only
R
W
Y
W
Y
CN2-1
R
CN2-3
Figure 1 - Drive Motor Strip Circuit
7. Set voltmeter to AC and connect black probe to CN1-3 (N)
and red probe to CN2-1 (CW Winding).
8. Plug in washer or reconnect power. Perform the CW
rotation of the motor under the "Manual Load Test" on
page 2-3.
¾ If 120 VAC is cycling ON during CW rotation, go to step 9.
¾ If 120 VAC is not present, go to Test #1: UI/Control
Board, page 3-4.
9. Unplug washer or disconnect power. If not already,
connect black probe to CN1-3 (N), red probe to CN2-3
(CCW Winding).
10. Plug in washer or reconnect power. Perform the CCW
rotation of the motor under the "Manual Load Test" on
page 2-3.
¾ If 120 VAC is cycling ON during CCW rotation, go to
step 11.
¾ If 120 VAC is not present, go to Test #1: UI/Control
Board, page 3-4.
11. Unplug washer or disconnect power. Remove connectors
CN1 and CN2 from the main control. With an ohmmeter,
check resistance of motor windings across the following
CN1 and CN2 connector pinouts:
Motor Winding
CW Winding
CCW Winding
¾ If values are open or out of range, go to step 12.
¾ If values are correct, go to step 16.
12. Remove back panel to access drive system and connector
bundle.
13. Locate the 3-wire "yellow" motor connector. Visually check
the connector and electrical connections to the motor.
¾ If visual check passes, go to step 14.
¾ If connections are loose, reconnect the electrical
connections and repeat step 1.
14. Disconnect the "yellow" 3-wire motor connector. With an
ohmmeter, check resistance of motor windings, from the
motor connector at the following connector pinouts.
Motor Winding
CW Winding
CCW Winding
RUN CAP
30 uF
CW
Y
6.9 - 8.8 Ω
Y
THERMAL
B
7.1 - 9.0 Ω
R
Y
CCW
DRIVE MOTOR
Pinouts (Wire Color)
CN1-3 (W) to CN2-1 (Y)
CN1-3 (W) to CN2-3 (R)
Pinouts (Wire Color)
Pin 2 (B) to Pin 1 (Y)
Pin 2 (B) to Pin 3 (R)
N MAIN BOARD
W
W W
CN1-3
Y
Resistance
6.9 - 8.8 ohms
7.1 - 9.0 ohms
Resistance
6.9 - 8.8 ohms
7.1 - 9.0 ohms