LG MS-2072A Service Manual page 20

COMPONENTS
RELAY 2
FAN MOTOR
(Wire leads removed)
TURNTABLE
MOTOR
(Wire leads removed)
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.
TEST PROCEDURE
Check for continuity of relay 2 with an
ohm-meter.
(Remove wire leads from relay 2 and
operate the unit.)
Relay 1
Power
Transformer
Measure the resistance.
(Ohm-meter scale: R x 100)
Measure the resistance.
(Ohm-meter scale: R x 1000)
5-10
POWER
LEVEL
Relay 2
Normal: 350~450 Ω
B
A
Abnormal: ∞ or several Ω
Normal: 70~130 Ω
Abnormal: ∞ or several Ω
RESULTS
20% 6 sec
40% 10 sec
60% 14 sec
80% 18 sec
100% 22 sec
Approx. 370 ~ 470 Ω
A
Approx. 30 ~ 80 Ω
B
16 sec
12 sec
8 sec
4 sec
0 sec