LG GR-372SF Service Manual ▷ View online
- 13 -
6-2 PTC AND OLP
6
5
3
4
YES
NO
NO
YES
NO
Cam Shaft
Normal operation of
Compressor is
impossible or poor.
Compressor is
impossible or poor.
Separate the PTC from
Compressor and
measure the resistance
between No. 5 and 6
(only RSIR Type) or No.
4 and 5 of PTC with a
Tester or Whistone
Bridge. (Figure 22)
Compressor and
measure the resistance
between No. 5 and 6
(only RSIR Type) or No.
4 and 5 of PTC with a
Tester or Whistone
Bridge. (Figure 22)
Separate the OLP
from Compressor and
check resistance
value between two
terminals of OLP with
a Tester. (Figure 23)
from Compressor and
check resistance
value between two
terminals of OLP with
a Tester. (Figure 23)
Observation value is
220V/50Hz : 22
220V/50Hz : 22
Ω
±30%
115V/60Hz : 6.8
Ω
±30%
240V/50Hz : 33
Ω
±30%
127, 220V/60Hz :
22
Ω
±30%
The resistance value is
0 or several
hundreds
0 or several
hundreds
Ω
.
The value is
∞.
Check another
electric components.
electric components.
Replace OLP.
Check another
electric components.
electric components.
Replace
PTC.
PTC.
Figure 23
Figure 22
Normal operation of
the Defrost Timer is
impossible.
the Defrost Timer is
impossible.
No defrosting.
Poor cooling.
Turn the Cam Shaft.
Shake about 3 times
with holding the Cam
Shaft and Body softly.
with holding the Cam
Shaft and Body softly.
The resistance is
∞.
The resistance is
0
0
Ω
or variable.
The resistance is about
220V 50/60Hz : 7~30k
220V 50/60Hz : 7~30k
Ω
120V 50/60Hz : 3~ 5k
Ω
Loud "click" sound.
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
.Check the other
electric components.
electric components.
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
6-3 DEFROST TIMER
Position the Cam Shaft to
the point of first 'click'
sound and check the
current between terminals
No. 1 (brown) and
No. 2 (bright orange). Next,
position the Cam Shaft to
the point of second 'click'
sound and check the
current between terminals
No. 1 (brown) and
No. 4 (black). (Figure 24).
the point of first 'click'
sound and check the
current between terminals
No. 1 (brown) and
No. 2 (bright orange). Next,
position the Cam Shaft to
the point of second 'click'
sound and check the
current between terminals
No. 1 (brown) and
No. 4 (black). (Figure 24).
Figure 24
- 14 -
6-4 ANOTHER ELECTRIC COMPONENTS
▼
Cooling is impossible
Compressor
doesn't run.
doesn't run.
Running state of
Compressor is poor.
Compressor is poor.
Check a starting
voltage.
voltage.
Check if current flows to
the following
components.
the following
components.
a. Thermostat
b. Starting devices
c. OLP
d. Compressor coil
e. Defrost Timer
f. Circuit parts
Low voltage.
Poor contacting and
gas leakage.
gas leakage.
Shorted or broken.
Poor contacting
or shorted.
or shorted.
Coil shorted.
Poor contacting
or shorted.
or shorted.
Poor contacting
and broken.
and broken.
Shorted.
Lack of capacity.
Coil of Motor
Compressor.
Compressor.
Replace
the compressor.
the compressor.
Replace
each component.
each component.
Raise the voltage.
Replace
each component.
each component.
Cause
Check if current flows
to starting devices.
to starting devices.
Check current flowing
in sub-coil of
Compressor.
in sub-coil of
Compressor.
Check capacity of OLP.
The items described
above are normal.
above are normal.
▼
Cooling ability is poor
Fan motor
doesn't run.
doesn't run.
Much frost are sticked
to the EVAPORATOR.
to the EVAPORATOR.
Poor contacting.
Coil is shorted.
Shorted.
Replace
each component.
each component.
Replace
each component.
each component.
Replace
each component.
each component.
Running is poor.
(Coil is shorted.)
(Coil is shorted.)
Check current flowing
of the door S/W.
of the door S/W.
Check current flowing
in the Fan Motor.
in the Fan Motor.
Check the running
condition of Timer.
condition of Timer.
Check current flowing
of the following
components.
• Def Control Assy
of the following
components.
• Def Control Assy
Check current flowing
of the following
components.
• L-CORD, TE-PLATE
of the following
components.
• L-CORD, TE-PLATE
HEATER
- 15 -
6-5 SERVICE DIAGNOSIS CHART
●
In addition to the items described above, refer to the followings to solve the complaint.
Check if dew forms
in the Freezer.
in the Freezer.
Replace the
Components of
defrosting circuit.
Components of
defrosting circuit.
Check Refrigerating
Cycle.
Cycle.
Check the
Thermostat.
Thermostat.
Defrosting is poor.
The cycle is faulty.
Repair the cycle.
Replace the
Thermostat.
Thermostat.
The operation of the
Thermostat is poor.
Thermostat is poor.
COMPLAINT
POINTS TO BE CHECKED
REMEDY
Cooling is
• Is the power cord unplugged from the outlet?
• Plug to the outlet.
impossible.
• Check if the power S/W is setted to OFF.
• Set the switch to ON.
• Check if the fuse of power S/W is shorted.
• Replace a regular fuse.
• Measure the voltage of power outlet.
• If voltage is low, wire newly.
Cooling ability
• Check if the set is placed close to wall.
• Place the set with the space of about 10cm.
is poor.
• Check if the set is placed close to stove, gas
• Place the set apart from these heat sources.
•
cooker and direct rays.
•
• Is the ambient temperature high or
• Make the ambient temperature below.
•
the room door closed?
• Check if putting in hot food.
• Put in food after they get cold.
• Did you open the door of the set too often
• Don't open the door too often and close
•
or check if the door is closed up?
•
it firmly.
• Check if the Thermostat is set to "WARM (1)"
• Set the knob to "MID (2)"
Freezing ability
• Is the ambient temperature too LOW(10˚C)?
• For colder freezer, turn the CLOD AIR CONTROL
is poor
to "7"~"9", and the TEMP. CONTROL to "7"~"9".
• Check if thermostat is set to 1~3?
• Check if the registor is well attached to
thermostat with Al Tape.
Food in the
• Are food placed in cooling air outlet?
• Place food in high temperature section.
Refrigerator
•
(Front Part)
are frozen.
• Check if the Thermostat is set to "COLD (3)".
• Set the knob to "MID (2)"
• Is the ambient temperature within 5°C?
• Set the knob to "WARM (1)"
Dew or ice
• Are watery food kept?
• Seal up watery food with vinyl wrap.
forms in the
• Check if putting in hot food.
• Put in food after getting cold.
chamber of
• Did you open the door of the set too
• Don't open the door too often and close
the set.
•
often or check if the door is closed up.
•
it firmly.
Dew forms
• Check if ambient temperature and humidity
• Wipe dew with a dry cloth. This happening
in the Out Case.
•
are high.
•
is solved in low temperature and humidity
•
naturally.
• Is the gap in the door packing?
• Fill up the gap.
Abnormal
• Is the set positioned in a firm and even place?
• Adjust the Leveling Screw, and place
noise generates.
•
in the firm place.
• Does any unnecessary objects exist
• Remove the objects.
•
in the back side of the set?
• Check if the Cover Evaporating Tray is omitted.
• Place it on an original position.
• Check if the cover of mechanical room
• Place the cover at an original position.
•
in below and front side is taken out.
To close the door
• Check if the door packing becomes dirty
• Clean the door packing.
is not handy.
•
by filth such as juice.
• Is the set positioned in a firm and even place?
• Position in the firm place and adjust the
•
Leveling Screw.
• Are too much food put in the set?
• Keep foods from reaching to the door.
Ice and food
• Check if the inside of the set becomes dirty.
• Clean the inside of the set.
smell unpleasant.
• Did you keep smelly foods without wraping?
• Wrap smelly food.
• It smells plastic.
• The new products smell plastic, but it is
•
removed after 1-2 weeks.
- 16 -
6-6 REFRIGERATING CYCLE
▼
Troubleshooting Chart
▼
Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
runs or not.
Whether frost
forms or not in
Evaporator.
forms or not in
Evaporator.
Observe the discharging
amount of Refrigerant.
amount of Refrigerant.
Inject Refrigerant to
Compressor and check
cooling operation.
Compressor and check
cooling operation.
Clogged by dust.
Gas leakage.
Faulty
Compressor.
Compressor.
Moisture Clog.
Whether oil leaks
or not.
or not.
Normal formed frost
Normal amount
No or much amount
(Check the leakage point)
Normal formed
frost in Evaporator
frost in Evaporator
No frost or forms
in inlet only
in inlet only
Check Comprossor
PARTIAL
Freezer and
Low flowing sound of
A little high
• A little Refrigerant
LEAKAGE
Refrigerator
Refrigerant is heard and
more than
•
discharges.
don't get cold
frost forms in inlet only
ambient
• Normal cooling is possible
normally.
temperature.
•
when injecting Refrigerant
•
of regular amount.
WHOLE
Freezer and
Flowing sound of Refrigerant
Equal to ambient
• No discharging of Refrigerant.
LEAKAGE
Refrigerator
is not heard and frost isn't
temperature.
• Normal cooling is possible
don't get cold
formed.
•
when injecting Refrigerant
at all.
•
of regular amount.
PARTIAL
Freeze room and
Flowing sound of Refrigerant
A little high
• Normal discharging of
CLOG
Refrigerator
is heard and frost forms
more than
•
refrigerant.
don't get cold
in inlet only.
ambient
• The capillary tube is faulty.
normally.
temperature.
WHOLE
Freezer and
Flowing sound of Refrigerant
Equal to ambient
• Normal discharging of
CLOG
Refrigerator
is not heard and frost isn't
temperature.
•
Refrigerant.
don't get cold.
formed.
MOISTURE
Cooling operation
Flowing sound of Refrigerant
Low than
• Cooling operation restarts
CLOG
stops periodically.
is not heard and frost melts.
ambient
•
when heating the inlet of
temperature
•
capillary tube.
COMP-
Freezer and
Low flowing sound of
A little high
• The pressure of high
RESSION
Refrigerator
Refrigerant is heard and
than ambient
•
pressure part in
don't get cold.
frost forms in inlet only.
temperature.
•
compressor is low.
NO COMP-
No compressing
Flowing sound of Refrigerant
Equal to ambient
• No pressure of high pressure
RESSION
operation.
is not heard and no frost.
temperature.
•
part in compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF
THE SET
STATE OF THE
EVAPORATOR
LEAKA
G
E
CLOGGED
BY
DUST
DEFECTIVE
COMPRESSION
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