LG RCS10A Service Manual page 31

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures, Oven does not operate at all, Display window does not display any figures,
(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,
and no input is accepted. and no input is accepted.
and no input is accepted.
CONDITION
CONDITION
1. Fuse blows. 1. Fuse blows. 1. Fuse blows. 1. Fuse blows.
1. Fuse blows.
NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8 NOTE : All these switches must be replaced at the same time. Refer to page 5-7, 5-8
2. Fuse does not
2. Fuse does not 2. Fuse does not 2. Fuse does not 2. Fuse does not
blow.
blow. blow. blow. blow.
CHECK
CHECK
Check continuity Check continuity Check continuity Check continuity
Check continuity
of monitor of monitor of monitor of monitor
of monitor
switch (with switch (with switch (with switch (with
switch (with
door closed). door closed). door closed). door closed).
door closed).
Replace fuse Replace fuse Replace fuse Replace fuse
Replace fuse
Check continuity Check continuity Check continuity Check continuity
Check continuity
of primary of primary of primary of primary
of primary
switch (with switch (with switch (with switch (with
switch (with
door opened). door opened). door opened). door opened).
door opened).
Check continuity Check continuity Check continuity Check continuity
Check continuity
of secondary of secondary of secondary of secondary
of secondary
switch (with switch (with switch (with switch (with
switch (with
door opened). door opened). door opened). door opened).
door opened).
Disconnect one Disconnect one Disconnect one Disconnect one
Disconnect one
side of the wire side of the wire side of the wire side of the wire
side of the wire
lead connected lead connected lead connected lead connected
lead connected
from transformer from transformer from transformer from transformer
from transformer
to the high voltage to the high voltage to the high voltage to the high voltage
to the high voltage
capacitor and capacitor and capacitor and capacitor and
capacitor and
operate the unit. operate the unit. operate the unit. operate the unit.
operate the unit.
Measure to Measure to Measure to Measure to
Measure to
resistance high resistance high resistance high resistance high
resistance high
voltage capacitor voltage capacitor voltage capacitor voltage capacitor
voltage capacitor
(refer to page 5-9) (refer to page 5-9) (refer to page 5-9) (refer to page 5-9)
(refer to page 5-9)
Check continuity
Check continuity Check continuity Check continuity Check continuity
of thermostat.
of thermostat. of thermostat. of thermostat. of thermostat.
Check continuity
Check continuity Check continuity Check continuity Check continuity
of power supply
of power supply of power supply of power supply of power supply
cord.
cord. cord. cord. cord.
RESULT
RESULT
Continuity. Continuity. Continuity. Continuity.
Continuity.
No continuity. No continuity. No continuity. No continuity.
No continuity.
Continuity. Continuity. Continuity. Continuity.
Continuity.
No continuity. No continuity. No continuity. No continuity.
No continuity.
Continuity. Continuity. Continuity. Continuity.
Continuity.
No continuity. No continuity. No continuity. No continuity.
No continuity.
Fuse blows again Fuse blows again Fuse blows again Fuse blows again
Fuse blows again
Normal. Normal. Normal. Normal.
Normal.
Normal. Normal. Normal. Normal.
Normal.
Abnormal. Abnormal. Abnormal. Abnormal.
Abnormal.
No continuity.
No continuity. No continuity. No continuity. No continuity.
Continuity.
Continuity. Continuity. Continuity. Continuity.
No continuity.
No continuity. No continuity. No continuity. No continuity.
5-13
CAUSE
CAUSE
Malfunction of the Malfunction of the Malfunction of the Malfunction of the
Malfunction of the
monitor switch. monitor switch. monitor switch. monitor switch.
monitor switch.
Shorted contact at Shorted contact at Shorted contact at Shorted contact at
Shorted contact at
the primary switch. the primary switch. the primary switch. the primary switch.
the primary switch.
Malfunction of Malfunction of Malfunction of Malfunction of
Malfunction of
secondary switch. secondary switch. secondary switch. secondary switch.
secondary switch.
Defective high volt- Defective high volt- Defective high volt- Defective high volt-
Defective high volt-
age transformer. age transformer. age transformer. age transformer.
age transformer.
Defective high Defective high Defective high Defective high
Defective high
voltage capacitor. voltage capacitor. voltage capacitor. voltage capacitor.
voltage capacitor.
Defective
Defective Defective Defective Defective
thermostat.
thermostat. thermostat. thermostat. thermostat.
Defective power
Defective power Defective power Defective power Defective power
supply cord.
supply cord. supply cord. supply cord. supply cord.
REMEDY
REMEDY
Replace fuse, Replace fuse, Replace fuse, Replace fuse,
Replace fuse,
primary, monitor, primary, monitor, primary, monitor, primary, monitor,
secondary secondary secondary secondary
primary, monitor,
switches, and switches, and switches, and switches, and
secondary
RELAY(RY3)
switches, and
of P.C.B Assembly.
RELAY(RY2) of
P.C.B Assembly.
Replace fuse, Replace fuse, Replace fuse, Replace fuse,
primary, monitor, primary, monitor, primary, monitor, primary, monitor,
Replace fuse,
secondary secondary secondary secondary
primary, monitor,
switches, and switches, and switches, and switches, and
secondary
RELAY(RY3 )
switches, and
of P.C.B Assembly.
RELAY(RY2) of
P.C.B Assembly.
Replace fuse, Replace fuse, Replace fuse, Replace fuse,
Replace fuse,
primary, monitor, primary, monitor, primary, monitor, primary, monitor,
primary, monitor,
secondary secondary secondary secondary
secondary
switches, and switches, and switches, and switches, and
RELAY(RY3) switches, and
of P.C.B Assembly. RELAY(RY2) of
P.C.B Assembly.
Replace high volt- Replace high volt- Replace high volt- Replace high volt-
Replace high volt-
age transformer. age transformer. age transformer. age transformer.
age transformer.
Set is good condition Set is good condition Set is good condition Set is good condition
Set is good condition
(defective fuse only) (defective fuse only) (defective fuse only) (defective fuse only)
(defective fuse only)
Replace high Replace high Replace high Replace high
Replace high
voltage capacitor. voltage capacitor. voltage capacitor. voltage capacitor.
voltage capacitor.
Replace
Replace Replace Replace Replace
thermostat.
thermostat. thermostat. thermostat. thermostat.
Replace power
Replace power Replace power Replace power Replace power
supply cord.
supply cord. supply cord. supply cord. supply cord.