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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while
desired program times are set and START pad is touched.
CONDITION
1.Setting time does
not count down
when touching
START pad.
2. Fan motor or
oven lamp 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.
LGE Internal Use Only
CHECK
Check continuity
No continuity.
of secondary
switch (with
door closed).
Continuity.
Check continuity
of secondary
No continuity.
switch (with
door closed).
Continuity.
Check fan motor.
No continuity.
Check oven lamp.
No continuity.
Normal.
CHECK
Lower than 90% of
Check the
rating voltage.
power source
voltage.
Normal.
Disconnect the
wire leads from
Abnormal.
relay 2 and check
on and off time
Abnormal.
with multitester.
Measure the
Abnormal.
Abnormal. output.
RESULT
Defective
secondary switch.
Defective P.C.B
assembly.
Loose connection.
Defective fan
motor.
Defective oven
lamp.
RESULT
Decrease in power
source voltage
with load.
Defective P.C.B
assembly.
Defective
magnetron.
5-15
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CAUSE
REMEDY
Replace
secondary switch.
Replace P.C.B
assembly.
Connection then
tightly.
Replace fan
motor.
Replace oven
lamp.
CAUSE
REMEDY
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Replace P.C.B
assembly.
Replace
magnetron.
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