LG LRM1250W, Service Manual

Page: 24 / 34

5-13
2. Fuse does not
blow.
No continuity.
Continuity.
No continuity.
Defective power
supply cord. Replace power
supply cord.
Defective
thermostat. Replace
thermostat. Check continuity
of thermostat.
Check continuity
of power supply
cord.
NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8
CONDITION CHECK RESULT CAUSE REMEDY
(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,
and no input is accepted.
1. Fuse blows. Continuity.
No continuity.
Malfunction of the
monitor switch. Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.
Check continuity
of monitor
switch (with
door closed).
Continuity.
No continuity.
Shorted contact at
the primary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.
Check continuity
of primary
switch (with
door opened)
Continuity.
No continuity.
Malfunction of
secondary switch.
Replace fuse,
primary, monitor,
secondary
switches, and
RELAY(RY2) of
P.C.B Assembly.
Check continuity
of secondary
switch (with
door opened).
Normal.
Replace fuse
Fuse blows again
Defective high
voltage capacitor. Replace high
voltage capacitor. Disconnect one
side of the wire
lead connected
from transformer
to the high
voltage
capacitor and
operate the unit.
Defective high volt-
age transformer. Replace high volt-
age transformer.