LG MB-3071MC Service Manual page 28

(TROUBLE 6) Grill
CONDITION
1. Heater is not
operating
2. Lower tempera-
ture in the oven.
NOTE : • Make sure the wire leads correct position.
• When Removing the wire leads from the parts, be sure to grasp the connector, not the wires.
• When removing the magnetron, be sure to install the magnetron gasket in the correct position
and in good condition.
Output is full power
when you set lower
power level.
CHECK
Heater
Wire connection
Heater
Disconnect the
wire leads from
relay 3 and
check continuity
relay 3.(Operate
the unit)
Disconnect the
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)
RESULT
Abnormal
Normal
No continuity
Abnormal
Normal
Abnormal
Abnormal.
5-18
CAUSE
Malfunction the
heater.
Open or loosen.
Malfunction the
heater
Defective PCB
assembly.
Defective PCB
assembly.
REMEDY
Replace
Replace or
connect tighty
Replace
Replace PCB
assembly
Replace PCB
assembly.