LG MB-387W Service Manual - Page 27

TROUBLE 7 Grill

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(TROUBLE 6) Oven does not cook properly when programmed for the set power level (Operates properly on HIGH) CONDITION Output is full when you set lower power level. CHECK Disconnect the wire leads from relay 2 and check continuity relay 2. (Operate the unit) RESULT Abnormal. CAUSE Defective P.C.B. assembly. REMEDY Replace P.C.B. assembly. (TROUBLE 7) Grill CONDITION CHECK 1. Heater is not operating. Heater. RESULT Abnormal. Normal. CAUSE Malfunction the heater. REMEDY Replace. Thermostat and relay3.(Grill) Wire connection. 1. Lower temperature the oven. Heater. Abnormal. Normal. No continuity. Abnormal. Normal. Malfunction the thermostat. Replace. Open or loosen. Malfunction the heater. Replace or connect tightly. Replace. Thermostat and relay3.(Grill) Abnormal. Malfunction the thermostat. Replace. NOTE: * Make sure the wore leads correct position. * When removing the wire leads from 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. 5-17

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5-17
(TROUBLE 7) Grill
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1. Heater is not
operating.
Abnormal.
Normal.
Normal.
Heater.
Thermostat and
relay3.(Grill)
Abnormal.
Malfunction the
thermostat.
Malfunction the
heater.
Replace.
Wire connection.
No continuity.
Open or loosen.
Replace or
connect tightly.
Replace.
1. Lower tempera-
ture the oven.
Abnormal.
Normal.
Heater.
Thermostat and
relay3.(Grill)
Abnormal.
Malfunction the
thermostat.
Malfunction the
heater.
Replace.
Replace.
(TROUBLE 6) Oven does not cook properly when programmed for the set power level
(Operates properly on HIGH)
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is full when
you set lower
power level.
Abnormal.
Disconnect the
wire leads from
relay 2 and check
continuity relay 2.
(Operate the unit)
Defective P.C.B.
assembly.
Replace P.C.B.
assembly.
NOTE:
* Make sure the wore leads correct position.
* When removing the wire leads from 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.