LG GR-122SJ Service Manual ▷ View online
COMPRESSOR AND ELECTRIC COMPONENTS
6. TROUBLESHOOTING
- 10 -
1
3
2
4
5
5
1
5
4
5
4
3
3
5
5
2
Power Source.
Remove the PTC-Starter
from the Compressor and
measure voltage between
Terminal C of compressor
and Terminal 5 or 6 of PTC.
from the Compressor and
measure voltage between
Terminal C of compressor
and Terminal 5 or 6 of PTC.
No Voltage.
YES
YES
YES
NO
NO
NO
YES
YES
YES
NO
NO
YES
Rating Voltage ±10%?
Replace OLP.
Reconnect.
Replace
PTC-Starter.
PTC-Starter.
Replace OLP.
O.K.
Check connection
condition.
condition.
OLP disconnected?
Advise the customer
to use regular TRANS.
to use regular TRANS.
Replace Compressor.
OLP works within
30 sec. in forcible OLP
operation by turning
instant power on and off.
30 sec. in forcible OLP
operation by turning
instant power on and off.
Components start
in the voltage of Rating
Voltage ±10% below.
in the voltage of Rating
Voltage ±10% below.
Applied voltage isn't
in the range of Rating
Voltage ±10%.
in the range of Rating
Voltage ±10%.
Check the resistance among
M-C, S-C and M-S
in Motor Compressor.
M-C, S-C and M-S
in Motor Compressor.
Check the resistance of
two terminals in PTC-Starter.
two terminals in PTC-Starter.
Check if applying
a regular OLP.
a regular OLP.
Measure minimum starting
voltage after 5 min. for
balancing cycle pressure
and cooling the PTC.
voltage after 5 min. for
balancing cycle pressure
and cooling the PTC.
Check the
resistance of
Motor-
Compressor.
resistance of
Motor-
Compressor.
Check the
resistance of
PTC-Starter.
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
starting state.
PTC AND OLP
- 11 -
6
5
Normal operation of
Compressor is
impossible or poor.
Compressor is
impossible or poor.
Separate the PTC-Starter
from Compressor and
measure the resistance
between No. 5 and 6 of
PTC-Starter with Tester or
Whistone Bridge(Figure 16).
from Compressor and
measure the resistance
between No. 5 and 6 of
PTC-Starter with Tester or
Whistone Bridge(Figure 16).
Separate the OLP from
Compressor and check
resistance value between
two terminals of OLP with
Tester (Figure 17).
Compressor and check
resistance value between
two terminals of OLP with
Tester (Figure 17).
Observation value is
220V/50Hz : 33
Ω
±30%
110V/60Hz : 3.9
Ω
±30%
The resistance value is
0 or serveral hundreds
0 or serveral hundreds
Ω
.
YES
NO
The value is
∞
.
Check another
electric components.
electric components.
Replace OLP.
Check
another electric
components.
another electric
components.
Replace
PTC-Starter.
PTC-Starter.
Figure 16
Figure 17
+
-
Normal operation of the
Defrost Timer is
impossible.
Defrost Timer is
impossible.
No defrosting.
Poor cooling.
Position the Cam Shaft
to the point of first "click"
sound and check the current
flowing 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
flowing between terminals
No. 1(brown) and
No. 4(black).
(Figure 18).
to the point of first "click"
sound and check the current
flowing 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
flowing between terminals
No. 1(brown) and
No. 4(black).
(Figure 18).
Turn the Cam Shaft.
Shake about 3 times with
holding the Cam Shaft and
body softly.
holding the Cam Shaft and
body softly.
The resistance is
∞
The resistance is
0
0
Ω
or variable.
The resistance is about
220V/50Hz : 13~17K
220V/50Hz : 13~17K
Ω
110-115V/60Hz : 6~10K
Ω
Loud "click" sound.
YES
NO
NO
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
Check
the another electric
components.
the another electric
components.
Replace the
Defrost Timer.
Defrost Timer.
Replace the
Defrost Timer.
Defrost Timer.
Figure 18
CAM SHAFT
DEFROST TIMER
ANOTHER ELECTRIC COMPONENTS
▼
Cooling is impossible
- 12 -
Compressor
doesn't run.
doesn't run.
Running state of
Compressor is poor.
Compressor is poor.
Check a starting voltage.
Check if current flows to the
following components.
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.
Shorted or broken.
Poor contacting or shorted.
Coil shorted.
Poor contacting or shorted.
Poor contacting and broken.
Shorted.
Lack of capacity.
Coil of motor 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.
starting devices.
Check current flowing in
sub-coil of Compressor.
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 cooler.
sticked to the cooler.
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
in door switch.
in door switch.
Check current flowing
in the Fan Motor.
in the Fan Motor.
Check the running
condition of Timer.
condition of Timer.
• Defrost Thermostat
• Fuse-M
• Fuse-M
• L-cord
• TE-Plate Heater
• TE-Plate Heater
Check current flowing of
the following components.
the following components.
SERVICE DIAGNOSIS CHART
- 13 -
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
•
cooker and direct rays.
•
appliances.
• Is the ambient temperature high or
• Make the ambient temperature below.
•
the room door closed?
• Check if putting in hot foods.
• Put in foods 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.
• Set the knob to MID.
Foods in the
• Are foods placed in cooling air outlet?
• Place foods in high temperature section.
refrigerator
•
(Front Part)
are frozen.
• Check if the Thermostat is set to COLD.
• Set the knob to MID.
• Is the ambient temperature within 5°C?
• Set the knob to WARM.
Dew or ice
• Is watery foods kept?
• Seal up watery foods with wrap.
forms in the
• Check if putting in hot foods.
• Put in foods after they get 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 Adjust screw, and position
noise generates.
•
in the firm place.
• Does any unnecessary objects exist
• Remove the objects.
•
in the back side of the set?
• Check if the Drip Tray is omitted.
• Place it on an original position.
• Check if the cover of mechanical from
• 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
•
Adjust screw.
• Are too much foods putted in the set?
• Keep foods not to reach to the door.
Ice and foods
• 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 foods.
• It smells plastic.
• The new products smell plastic, but it is
•
removed after 1-2 weeks.
Click on the first or last page to see other GR-122SJ service manuals if exist.