LG MP-9483SLA Service Manual page 27

(TROUBLE 3) Display shows all figures set, but oven does not start cooking while
CONDITION
1.Setting time does
not count down
when touching
START button.
2. Fan motor,
c-motor or
oven lamp,
turntable
motor do not
turn on.
(TROUBLE 4) Oven seems to be operation but little heat is produced in oven load.
CONDITION
Output is low.
NOTE: Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5
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desired program times are set and START button is touched.
CHECK
Check continuity
of secondary
switch (with
door closed).
Check the con-
nection between
connector and
P.C.B assembly.
Check fan motor
c-motor.
Check oven lamp
turntable motor.
CHECK
Check the
power source
voltage.
Disconnect the
wire leads from
relay 4 and check
on and off time
with multitester.
Measure the
output power.
C temperature rise is normal condition.
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manuals search engine
RESULT
Defective
No continuity.
secondary switch
and secondary
switch wire
continuity.
connector.
Defective P.C.B
No continuity.
assembly.
Continuity. Loose connection.
Defective fan
Abnormal.
motor, c-motor.
Defective oven
Abnormal.
lamp turntable
motor.
Normal.
RESULT
Lower than 90% of
Decrease in power
rating voltage.
source voltage
with load.
Normal.
Defective P.C.B
Abnormal.
assembly.
Normal.
Defective
Abnormal.
magnetron.
5-17
CAUSE REMEDY
Replace
secondary switch
and secondary
switch wire
connector.
Replace P.C.B
assembly.
Connection then
tightly.
Replace fan
motor, c-motor.
Replace oven
lamp turntable
motor.
CAUSE REMEDY
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Replace P.C.B
assembly.
Replace
magnetron.