5-16
(TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and
no input is accepted.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-8
2. Fuse does not
blow.
No continuity.
Continuity.
Check continuity
of power supply
cord.
Defective power
supply cord.
Replace power
supply cord.
Defective mag-
netron thermostat,
oven thermostat
and Lower voltage
transformer.
Replace mag-
netron thermostat,
oven thermostat
and Lower voltage
transformer.
Check continuity
of magnetron
thermostat.
No continuity.
1. Fuse blows.
Continuity.
Malfunction of the
monitor switch.
Replace primary
and monitor
switches.
Check continuity
of monitor
switch (with
door closed).
Check continuity
of primary
switch (with
door opened).
No continuity.
Disconnect one
side of the wire
lead connected
from transformer
to the high
voltage
capacitor and
operate the unit.
No continuity.
Continuity.
Shorted contact at
the primary switch.
Replace primary
and monitor
switches.
Fuse blows again
Normal.
Defective high
voltage capacitor.
Replace high
voltage capacitor.
Defective high volt-
age transformer.
Replace high volt-
age transformer.
Replace fuse
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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Summary of Contents for SolarDOM MP9485FR
Page 37: ......
