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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.
Minimum 8.5°C temperature rise is normal condition.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
CHECK
Check continuity
No continuity.
of secondary
switch (with
door closed).
Continuity.
Check the con-
Continuity
nection between
CN1 connector
and PCB
No continuity
assembly.
Check fan motor.
Abnormal
Check oven lamp.
Abnormal
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
Normal
time with
multitester.
Measure the
Abnormal.
output power.
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 PCB
assembly.
Defective
magnetron.
5-14
CAUSE
REMEDY
Replace
secondary switch.
Replace P.C.B
assembly.
Connect them
tightly.
Replace fan motor.
Replace oven lamp.
CAUSE
REMEDY
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Replace PCB
assembly.
Replace
magnetron.
LGE Internal Use Only
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