LG MP-9483SLA Service Manual page 26

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