LG MB-4322AH, Service Manual

Page: 21 / 40

5-11
COMPONENTS TEST PROCEDURE RESULTS
TIMER MOTOR
(Wire leads removed)
FAN MOTOR
(Wire leads removed)
TURNTABLE
MOTOR
(Wire leads removed)
Check for continuity of timer motor with an
ohm-meter.
(Remove wire leads from timer motor)
Measure the resistance.
(Ohm-meter scale: R x 1)
Measure the resistance.
(Ohm-meter scale: R x 1000)
Normal:
Abnormal:
∞
or several
Ω
Normal: Approx. 100~200
Ω
Abnormal:
∞
or several
Ω
NOTE : • A MICROWAVE LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS
SERVICED FOR ANY REASON.
• MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION.
• WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE
CONNECTOR, NOT THE WIRES.
A
B
C
Turn On Turn Off
A
B
Grill Switch
Microwave Switch
Approx. 22 K
Ω
Note : A is timer ON, OFF
switch.
B is power supply
terminal of the timer
motor.
A ~ B A ~ C
30 ~ 50
Ω
300~500
Ω
A
B