LG SolarDOM MP-9486SC Service Manual page 29

(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.
(TROUBLE 7) Heater
CONDITION
1. Heater is not
operating.
2. Lower tempera-
ture the oven.
NOTE: * Make sure the wore leads are in the 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.
CHECK
Disconnect the
wire leads from
relay 4 and check
continuity relay 4.
(Operate the unit)
Relay 5- Up. sheath Heater
Relay 6- Lo. sheath Heater
Relay 7- Halogen + Ceramic Heater
CHECK
Heater.
Thermostat and
relay 5, 6, 7.
Wire connection.
Heater.
Thermostat and
relay 5, 6, 7.
RESULT
Abnormal.
RESULT
Abnormal.
Normal.
Abnormal.
Normal.
No continuity.
Abnormal.
Normal.
Abnormal.
5-19
CAUSE
Defective P.C.B.
assembly.
CAUSE
Malfunction of the
heater.
Malfunction of the
thermostat and
relay 5, 6, 7
Open or loosen.
Malfunction of the
heater.
Malfunction of the
thermostat and
relay 5, 6, 7
REMEDY
Replace P.C.B.
assembly.
REMEDY
Replace.
Replace.
Replace or
connect tightly.
Replace.
Replace.