LG MB-3949G Service Manual page 20

COMPONENTS
FUSE
GRILL THERMOSTAT
OVEN THERMOSTAT
MAGNETRON
THERMOSTAT
Disconnect the 7 pin
connector from P.C.B.
(Refer to schemetic diagram)
RELAY 2, RELAY 3
OF P.C.B.
(Wire leads removed.)
Note: Relay
Relay 1: Fan motor
Turntable motor
Oven lamp
Relay 2: Microwave
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Only for training and service purposes
TEST PROCEDURE
Check for continuity of the fuse with an
multi-meter.
NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches,
H.V.D. and H.V.C. before replacing the fuse.
If the fuse is blown by improper switch operation replace the defective switch and the
fuse at the same time. Replace just the fuse if the switches operate normally.
Check for P.C.B. connector.
1 3 5
Relay 1
Relay 2
5-10
RESULTS
Normal Abnormal
0°C~Approx.90°C Approx.90°C
0°C~Approx.145°C Approx.145°C
Cooking Start
Cooking Start
LGE Internal Use Only
OFF
OFF