LG MC-9283JR Service Manual page 25

(TROUBLE 2) Oven does not operate at all ; Display window does not display any figures and
no input is accepted.
CONDITION
1. Fuse blows.
NOTE : All these switches must be replaced at the same time. Refer to page 5-6, 5-7
2. Fuse does not
blow.
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.
RESULT
Continuity.
No continuity.
Continuity.
No continuity.
Normal.
Fuse blows again
No continuity.
Continuity.
No continuity.
5-15
CAUSE
Malfunction of the
monitor switch.
Shorted contact at
the primary switch.
Defective high
voltage capacitor.
Defective high volt-
age transformer.
Defective mag-
netron thermostat.
Defective power
supply cord.
REMEDY
Replace primary
and monitor
switches.
Replace primary
and monitor
switches.
Replace high
voltage capacitor.
Replace high volt-
age transformer.
Replace mag-
netron thermostat.
Replace power
supply cord.