LG Electronics Freezer GR S552 User Manual

REFRIGERATOR  
SERVICE MANUAL  
CAUTION  
BEFORE SERVICING THE UNIT, READ THE "SAFETY  
PRECAUTIONS" IN THIS MANUAL.  
MODEL: GR-S552 / GR-S592  
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SERVICING PRECAUTIONS  
vacuum operation is over, add the quantity in grams of  
Air Recharging in Compressor  
R-134a to the refrigerant system. Remember that every  
system has an exact quantity of R-134a with a tolerance of  
±5 grams that can be added. (Figure 4)  
Test the refrigeration by connecting it electrically before  
refilling operation. It is necessary to ascertain the function  
of the motor-compressor and identify the defects  
immediately. If the defects have been found, empty the old  
system of eventual R-134a residue by breaking off the end  
of the extension piece at its narrow point. (Figure 1)  
Replace the filter and any damaged components. Unsolder  
and pull off the piece remaining inside the service tube and  
then attach an extension completely with male Hansen and  
last, solder it to the same tube again. (Figure 2)  
TO THE R-134a CYLINDER  
POINT TO BE  
CHARGE TUBE  
BROKEN  
EXTENSION  
FEMALE  
HANSEN  
TO THE REFRIGERATION  
SYSTEM  
MALE HANSEN  
Figure 4  
SERVICE TUBE EXTENSION  
SOLDERING POINT  
Figure 1  
Figure 2  
Before performing this operation (if the vacuum pump and  
refilling cylinder are connected), make sure that the valve  
placed between the vacuum pump and refilling tube are  
closed to keep the Freon for adding to the system. (Figure 5)  
It is necessary to execute the soldering operation with  
valve open so that the fumes caused by oil residue can  
come out freely without blowholes between two tubes  
during heating the point to be soldered.  
FILLING OR  
VALVE TO BE OPENED  
WHEN REFILLING  
CHARGE TUBE  
The extension fitted with the male Hansen is connected to  
the female fitting of the vacuum pump tube. (Figure 3)  
TO THE REFRIGERATION  
SYSTEM  
TO THE CHARGE  
CYLINDER  
VALVE TO BE CLOSED  
AFTER VACUUM  
TO THE VACUUM  
PUMP  
Figure 5  
TO THE VACUUM PUMP  
PRESSURE  
GAUGE  
In addition, check the graduated scale on the cylinder for  
the quantity of R-134a to be added, for example, if we  
have 750 grams of Freon in the cylinder and must add 165  
grams to the group, this amount will be reached when  
R-134a has dropped to 585 grams, remembering that the  
indicator shows a lower limit of meniscus. Do this after  
choosing the scale corresponding to the gas pressure  
different scales reported as the same gas pressure  
indicated by the pressure gauge on the top of the column.  
To make R-134a flow into the system, open the valve  
placed at the base of the cylinder and connected to the  
filling tube. The amount of Freon cannot be added to the  
system all at once because it may cause a blocking of  
motor-compressor. Therefore, proceed by adding original  
quantity of about 20-30 grams and close the valve  
immediately.  
The pressure rises and the motor-compressor must start,  
sucking the gas and making the pressure go down again.  
Regulate the valve again, maintaining the same manner  
until reaching to the quantity of R-134a established for the  
system being charged. When the system is running, the  
suction pressure must be stabilized between 0.10 to 0.4  
atmosphere.  
Figure 3  
Air evacuating from the system begins so soon as the  
pump starts. The refrigeration system must be kept under  
vacuum until the reading on the low-pressure gauge  
indicates vacuum (0 absolute, -1 atm., -760 mm hg) in any  
case it is advisable to keep the pump running for about 60  
minutes. (Figure 3)  
In case that a considerable leakage occurs and to stop the  
vacuum pump will be necessary and add a small quantity  
of Freon to the system, if vacuum should not be obtained  
(pressure gauge can't fall to 1 atmosphere), start the  
refrigeration unit and find the leakage with the special leak-  
finder. When the defective soldering point is visible, re-do it  
after opening the extension tube valve and reestablishing  
the normal outside pressure inside the group.  
Because the melted alloy is sucked into the tubes and  
block them, the pressure must be rebalanced when  
vacuum is in the system in soldering. As soon as the  
- 3 -  
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1. SPECIFICATIONS  
1-1 GR-S552  
ITEMS  
FREEZER  
SPECIFICATIONS  
ITEMS  
FREEZER  
REFRIGERATOR  
SPECIFICATIONS  
1 EA  
114  
SHELF  
NET CAPACITY REFRIGERATOR  
306  
2 EA  
( l )  
TOTAL  
420  
VEGETABLE TRAY  
EGG TRAY  
Drawer Type  
2 Pieces  
DIMENSIONS (mm)  
NET WEIGHT (kg)  
755(W)  
X689(D)X1777(H)  
79  
ICE TRAY  
2 Pieces (Plastic)  
1 Piece  
COOLING SYSTEM  
TEMPERATURE CONTROL  
Fan Cooling  
ICE BANK  
Micom Control  
Full Automatic  
Heater Defrost  
COMPRESSOR  
EVAPORATOR  
CONDENSER  
REFRIGERANT  
DEFROSTING DEVICE  
P.T.C Starting Type  
Fin Tube Type  
Wire Condenser  
R-134a (135g)  
HEATER  
DEFROSTING SYSTEM  
OUT CASE  
Pre Coated Metal  
A B S  
INNER CASE  
INSULATION  
Polyurethane Foam  
1-2 GR-S592  
ITEMS  
FREEZER  
SPECIFICATIONS  
ITEMS  
SPECIFICATIONS  
1 EA  
126  
334  
460  
FREEZER  
SHELF  
NET CAPACITY REFRIGERATOR  
REFRIGERATOR  
2 EA  
( l )  
TOTAL  
VEGETABLE TRAY  
EGG TRAY  
Drawer Type  
2 Pieces  
DIMENSIONS (mm)  
NET WEIGHT (kg)  
755(W)X719(D)X1777(H)  
81  
ICE TRAY  
2 Pieces (Plastic)  
1 Piece  
COOLING SYSTEM  
TEMPERATURE CONTROL  
Fan Cooling  
ICE BANK  
Micom Control  
Full Automatic  
Heater Defrost  
COMPRESSOR  
EVAPORATOR  
CONDENSER  
REFRIGERANT  
DEFROSTING DEVICE  
P.T.C Starting Type  
Fin Tube Type  
Wire Condenser  
R-134a (135g)  
HEATER  
DEFROSTING SYSTEM  
OUT CASE  
Pre Coated Metal  
A B S  
INNER CASE  
INSULATION  
Polyurethane Foam  
- 4 -  
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2. PARTS IDENTIFICATION  
2-1 FEATURE CHART  
FREEZER  
COMPARTMENT  
Lamp  
Shelf  
Freezer Temperature  
Control Dial  
Twisting Ice  
Serve(Option)  
or  
Freezer Door Rack  
General Type  
Ice Making  
REFRIGERATOR  
COMPARTMENT  
Deodorizer  
Egg Storage Rack  
Refrigerator  
Temperature  
Electronic Control  
Fresh Meat  
Lamp  
Shelves  
Vegetable Drawer  
Used to keep fruits  
and vegetables, etc.  
fresh and crisp.  
Leveling Screw  
Base Cover  
NOTE : This is a basic model. The shape of refrigerator is subject to change.  
- 5 -  
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3. DISASSEMBLY  
3-1 DOOR  
3-2 DOOR SWITCH  
1. To remove the door switch, pull out it with a '—' type  
driver as shown in (figure 9).  
Freezer Door  
1. Remove the hinge cover by pulling it upwards.  
2. Loosen hexagonal bolts fixing the upper hinge to the  
body and lift the freezer door.  
2. Disconnect the lead wire from the switch.  
HINGE COVER  
BOLT  
HINGE  
Figure 9  
Figure 6  
3-3 FAN AND FAN MOTOR  
3. Pull out the door gasket to remove from the door foam  
Ass'y.  
1. Remove the freezer shelf.  
2. Remove the Cover Lamp-F and Case Lamp by  
loosening 1 screw fixed to ceiling of Inner Case.  
GASKET  
Figure 11  
3. Remove the Grille by pulling it out.  
Figure 7  
4. Pull out the Shroud and remove the Fan Motor Assy by  
loosening 2 screws.  
5. Pull out the fan and, separate the Fan Motor, Brackets  
and the Guide Fan.  
Refrigerator Door  
1. Loosen hexagonal bolts fixing the lower hinge to the  
body to remove the refrigerator door only.  
FAN MOTOR  
SHROUD  
LOWER HINGE  
BOLT  
GUIDE FAN  
FAN  
GRILLE  
Figure 8  
Figure 12  
2. Pull out the door gasket to remove from the door foam  
Ass'y.  
- 6 -  
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3-5-1 Freezer room lamp  
3-4 DEF' CONTROL ASSY  
1. Unplug the power cord from the outlet.  
Def control ASM consists of Defrost Sensor and FUSE–M.  
2. Remove the room lamp lid by taking down while pulling  
it forward with your hand after inserting finger into the  
inside hole as shown in (figure 16).  
Defrost Sensor functions to defrost automatically and it is  
attached to the Evaporator and the metal side of the case  
senses Temp.  
3. Remove the lamp by turning it counterclockwise.  
4. Assemble in reverse order of disassembly. Replacement  
bulb must be the same specication as original.  
Fuse-M is a kind of safety device for preventing over-  
heating of the Heater when defrosting.  
At the temperature of 77°C, it stops the emission of TEMP  
from the Defrost Heater.  
1. Pull out the shroud-F after removing the Grille Fan.  
(Figure 13)  
2. Separate the connectors connected with the Def Control  
ASM and replace the Def Control ASM after cutting the  
Tie Wrap. (Figure 14)  
3-5-2 Refrigerator room lamp  
1. Unplug the power cord from the outlet.  
2. Remove refrigerator shelves.  
3. Remove the room lamp lid by taking down while pulling  
forward with your hands as shown in (figure 17).  
4. Turn the lamp counterclockwise.  
5. Assemble in reverse order of disassembly. Replacement  
bulb must be the same specification as original.  
SHROUD-F  
FAN  
DEF CONTROL ASM  
3-6 CONTROL BOX-R  
1. First, remove all shelves in the refrigerator and Control  
Box-R by loosening 1 screw.  
Figure 13  
Figure 14  
MULTI FLOW  
DUCT  
3-5 LAMP  
FREEZER ROOM LAMP  
REFRIGERATOR ROOM LAMP  
Figure 18  
2. Loosen 2 screws fixing the Control Box-R to the Inner  
Case after detaching the cap screw.  
Figure 16  
Figure 17  
3. Remove the Control Box-R by pulling it downward.  
- 7 -  
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4. ADJUSTMENT  
4-2-3 PTC-Applied Circuit Diagram  
According to Starting Method of Motor  
4-1 COMPRESSOR  
4-1-1 Role  
The compressor inhales low temperature and low pressure  
gas evaporated from Evaporator of the Refrigerator, and  
condenses this gas to high temperature and high pressure  
gas, and then plays delivering role to Condenser.  
OVERLOAD PROTECTOR  
C
4-1-2 Composition  
COMPRESSOR  
MOTOR  
PTC  
The Compressor is Composed of Compressor Apparatus  
compressing gas, Compressor Motor moving Compressor  
Apparatus and Case protecting Compressor Apparatus  
and Motor. There are PTC-Starter, and Over Load  
Protector (OLP) in the Compressor outside. On the other  
hand, because the Compressor consists of 1/1000mm processing  
precision components and is sealed after producing without dust  
or humidity, deal and repair with care.  
5
M
S
S
M
6
3
HERMETIC  
TERMINAL  
PTC STARTER  
RSIR  
Figure 20  
4-1-3 Note to Use  
(1) Be careful not to allow over-voltage and over-current.  
(2) No Strike  
If applying forcible power or strike (dropping or careless  
dealing), poor operation and noise may occur.  
(3) Use proper electric components appropriate to the  
Compressor.  
4-2-4 Motor Restarting and PTC Cooling  
(1) For restarting after power off during normal  
Compressor Motor operation, plug the power cord after  
5 min. for pressure balance of Refrigerating Cycle and  
PTC cooling.  
(2) During normal operation of Compressor Motor, PTC  
elements generate heat continuously. Therefore,  
if PTC isn't cooled for a while after power off, Motor  
can't operate again.  
(4) Note to Keep Compressor.  
If Compressor gets wet in the rain and rust in the pin of  
Hermetic Terminal, poor operation and poor contact  
may cause.  
4-2-5 Relation of PTC-Starter and OLP  
(5) Be careful that dust, humidity, and flux due to welding  
don't inflow in Compressor inside in replacing  
(1) If power off during operation of Compressor and power  
on before PTC is cooled, (instant shut-off within 2 min.  
or reconnect a power plug due to misconnecting),  
PTC isn't cooled and a resistance value grows. As a  
result, current can't flow to the sub-coil and Motor can't  
operate and OLP operates by flowing over current in  
only main-coil.  
Compressor. Dust, humidity, and flux due to welding  
which inflows to Cylinder may cause lock and noise.  
4-2 PTC-STARTER  
(2) While the OLP repeats on and off operation about 3-5  
times, PTC is cooled and Compressor Motor performs  
normal operation.  
4-2-1 Composition of PTC-Starter  
(1) PTC (Positive Temperature Coefficient) is no-contact  
semiconductor starting device which uses ceramic  
material and the material consists of BaTiO3.  
(2) The higher the temperature is, the higher resistance  
value becomes . These features are used as starting  
device of Motor.  
If OLP doesn't operate when PTC is not cooled,  
Compressor Motor is worn away and causes circuit-  
short and fire. Therefore, use a proper fixed OLP  
without fail.  
4-2-6 Note to Use PTC-Starter  
(1) Be careful not to allow over-voltage and over-current.  
(2) No Strike  
4-2-2 Role of PTC-Starter  
(1) PTC is attached to Hermetic Compressor used for  
Refrigerator, Show Case and starts Motor.  
Don't apply a forcible power or strike.  
(3) Keep apart from any liquid.  
(2) Compressor for household refrigerator applies single-  
phase induction Motor.  
For normal operation of single-phase induction motor, in  
the starting operation flows in both main coil and sub-  
coil. After the starting is over, the current is cut off in  
subcoil. The proper features of PTC play the above all  
roles. So, PTC is used as a starting device of motor.  
If liquid such as oil or water inflows into PTC,  
PTC materials it may break due to insulation  
breakdown of material itself.  
(4) Don't change PTC at your convenience.  
Don't disassemble PTC and mold. If damaging to  
outside of PTC-starter, resistance value alters and poor  
starting of compressor motor may cause.  
(5) Use a properly fixed PTC.  
- 8 -  
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4-3 OLP (OVER LOAD PROTECTOR)  
4-3-1 Definition of OLP  
CONTACTING  
POINT  
COVER  
(1) OLP (OVER LOAD PROTECTOR) is attached to  
Hermetic Compressor and protects Motor by cutting off  
current in Compressor Motor by Bimetal in the OLP in  
case of over-rising temperature.  
BIMETAL  
CONTACTING  
POINT  
(2) When over-voltage flows to Compressor motor, Bimetal  
works by heating the heater inside OLP,  
HEATER  
and OLP protects Motor by cutting off current which  
flows to Compressor Motor.  
TERMINALS  
4-3-2 Role of OLP  
(1) OLP is attached to Hermetic Compressor used to  
Refrigerator and Show Case and prevents Motor Coil  
from being started in the Compressor.  
(2) Do not turn the Adjust Screw of OLP in any way for  
normal operation of OLP.  
BIMETAL  
ADJUST  
SCREW  
(Composition and connection Diagram of OLP)  
Figure 21  
HEATER  
5. CIRCUIT DIAGRAM  
NOTE : 1. This is a basic diagram and specifications vary in different localities.  
- 9 -  
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6. TROUBLESHOOTING  
6-1 COMPRESSOR AND ELECTRIC COMPONENTS  
YES  
(Rating Voltage  
±10%)?  
Remove the PTC-Starter  
from the Compressor  
and measure the voltage  
between Terminal C of  
Compressor and  
Power Source.  
1
2
Terminals 5 or 6 of PTC.  
YES  
No Voltage.  
OLP disconnected?  
Replace OLP.  
5
Check connection  
condition.  
Reconnect.  
Advise the customer  
to use a regular  
Trans.  
Applied voltage isn't  
in the range of Rating  
Voltage ±10%.  
5
YES  
Check the  
resistance of  
Motor  
Check the resistance  
among M-C, S-C and  
M-S in Motor  
3
5
2
3
NO  
Replace Compressor.  
Compressor.  
Compressor.  
3
4
YES  
NO  
Check the resistance  
of two terminals in  
PTC-Starter.  
Check the  
resistance of  
PTC-Starter.  
4
5
Replace  
PTC-Starter.  
YES  
YES  
Check if applying  
a regular OLP.  
OLP works within  
30 sec. in forcible  
OLP operation by  
turning instant power  
on and off.  
5
Check OLP.  
4
5
NO  
Replace OLP.  
NO  
YES  
Check  
starting state.  
Measure minimum  
starting voltage after 5  
min. for balancing cycle  
pressure and cooling  
the PTC.  
Components start in  
the voltage of Rating  
Voltage ±10%  
O.K.  
below.  
1
NO  
- 10 -  
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6-2 PTC AND OLP  
Check another  
electric components.  
Normal operation of  
Compressor is  
impossible or poor.  
Observation value is  
Separate the PTC from  
Compressor and  
220V/50Hz : 47± 30%  
220 - 240V/50Hz : 47± 30%  
110 -115V/60Hz : 6.8± 30%  
220V/60Hz : 47± 30%  
127V/60Hz : 22± 30%  
measure the resistance  
between No. 5 and 6  
(only RSIR Type) or No.  
4 and 5 of PTC with a  
Tester or Whistone  
Replace  
PTC.  
Bridge. (Figure 22)  
The resistance value is  
0 or several  
hundreds .  
The value is .  
YES  
NO  
Check another  
electric components.  
Separate the OLP  
from Compressor and  
check resistance  
value between two  
terminals of OLP with  
a Tester. (Figure 23)  
Replace OLP.  
4
6
5
3
Figure 23  
Figure 22  
- 11 -  
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6-3 ANOTHER ELECTRIC COMPONENTS  
Cooling is impossible  
Compressor  
doesn't run.  
Check if current flows to  
the following  
Cause.  
components.  
a. Thermistor  
Poor contacting.  
b. Starting devices  
c. OLP  
Shorted or broken.  
Poor contacting  
or shorted.  
d. Compressor coil  
e. Circuit Parts  
Coil shorted.  
Replace  
each component.  
Poor contacting  
or shorted.  
Running state of  
Compressor is poor.  
Check a starting  
voltage.  
Low voltage.  
Raise the voltage.  
Check if current flows  
to starting devices.  
Poor contacting  
and broken.  
Replace  
each component.  
Check current flowing  
in sub-coil of  
Shorted.  
Compressor.  
Check capacity of OLP.  
Lack of capacity.  
The items described  
above are normal.  
Coil of motor  
Compressor.  
Replace  
the compressor.  
Cooling ability is poor  
Fan motor  
doesn't run.  
Check current flowing  
in door S/W.  
Poor contacting.  
Replace  
each component.  
Check current flowing  
in the Fan Motor.  
Coil is shorted.  
Shorted.  
Replace  
each component.  
Check current flowing  
of the following  
components.  
Much frost are sticked  
to the EVAPORATOR.  
• Def. Sensor  
• FUSE-M  
Check current flowing  
of the following  
components.  
Replace  
each component.  
• Sheath Heater  
- 12 -  
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6-4 SERVICE DIAGNOSIS CHART  
COMPLAINT  
POINTS TO BE CHECKED  
REMEDY  
Cooling is  
impossible.  
• Is the power cord unplugged from the outlet?  
• Check if the power S/W is set to OFF.  
• Check if the fuse of power S/W is shorted.  
• Measure the voltage of power outlet.  
• Plug to the outlet.  
• Set the switch to ON.  
• Replace a regular fuse.  
• If voltage is low, wire newly.  
Cooling ability  
is poor.  
• Check if the set is placed close to wall.  
• Check if the set is placed close to stove, gas  
cooker and direct rays.  
• Place the set with the space of about 10cm.  
• Place the set apart from these heat  
appliances.  
• Is the ambient temperature high or  
the room door closed?  
• Make the ambient temperature below.  
• Check if putting in hot foods.  
• Put in foods after they get cold.  
• Don't open the door too often and close  
it firmly.  
• Did you open the door of the set too often  
or check if the door is closed up?  
• Check if the Control is set to "Min".  
• Set the control to mid-position.  
Foods in the  
Refrigerator  
are frozen.  
• Are foods placed in cooling air outlet?  
• Place foods in high temperature section.  
(Front Part)  
• Set the Display LED to "Mid".  
• Set the Display LED to "Min".  
• Check if the Display LED is set to "Max".  
• Is the ambient temperature below 5°C?  
Dew or ice  
forms in the  
chamber of  
the set.  
• Is watery foods kept?  
• Seal up watery foods with wrap.  
• Put in foods after they get cold.  
• Don't open the door too often and close  
it firmly.  
• Check if putting in hot foods.  
• Did you open the door of the set too  
often or check if the door is closed up.  
Dew forms  
in the Out Case.  
• Check if ambient temperature and humidity  
of surroumcling air are high.  
• Wipe dew with a dry cloth. This happening  
is solved in low temperature and humidity  
naturally.  
• Is the gap in the door packed?  
• Fill up the gap.  
Abnormal  
noise generates.  
• Is the set positioned in a firm and even place?  
• Adjust the Adjust Screw, and position  
in the firm place.  
• Does any unnecessary objects exist  
in the back side of the set?  
• Remove the objects.  
• Check if the Drip Tray is not firmly fixed.  
• Check if the cover of mechanical room  
in below and front side is taken out.  
• Fix it firmly on an original position.  
• Place the cover at an original position.  
To close the door  
is not handy.  
• Check if the door packing becomes dirty  
by filth such as juice.  
• Clean the door packing.  
• Is the set positioned in a firm and even place?  
• Position in the firm place and adjust the  
Adjust Screw.  
• Is too much food putted in the set?  
• Keep foods not to reach the door.  
Ice and foods  
smell unpleasant.  
• Check if the inside of the set becomes dirty.  
• Did you keep smelly foods without wraping?  
• It smells plastic.  
• Clean the inside of the set.  
• Wrap smelly foods.  
• The new products smell plastic, but it is  
removed after 1-2 weeks.  
In addition to the items described left, refer to the followings to solve the complaint.  
Replace the  
Components of  
defrosting circuit.  
Check if dew forms in  
the Freezer.  
Defrosting  
is poor.  
The cycle  
is faulty.  
Check Refrigerating  
Cycle.  
Repair the cycle.  
The operation of  
the Thermistor is  
poor.  
Check the  
Thermistor  
Replace the  
Thermistor.  
- 13 -  
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6-5 REFRIGERATING CYCLE  
Troubleshooting Chart  
TEMPERATURE  
OF THE  
COMPRESSOR  
STATE OF  
CAUSE  
STATE OF THE  
EVAPORATOR  
REMARKS  
THE SET  
PARTIAL  
LEAKAGE  
Freezer and  
Refrigerator  
don't get cold  
normally.  
Low flowing sound of  
Refrigerant is heard and  
frost forms in inlet only  
A little high  
more than  
ambient  
• A little Refrigerant  
discharges.  
• Normal cooling is possible  
when injecting Refrigerant  
of regular amount.  
temperature.  
WHOLE  
LEAKAGE  
Freezer and  
Refrigerator  
don't get cold  
at all.  
Flowing sound of Refrigerant Equal to ambient  
• No discharging of Refrigerant.  
• Normal cooling is possible  
when injecting Refrigerant  
of regular amount.  
is not heard and frost isn't  
formed.  
temperature.  
PARTIAL  
CLOG  
Freeze room and  
Refrigerator  
don't get cold  
normally.  
Flowing sound of Refrigerant A little high  
• Normal discharging of  
refrigerant.  
• The capillary tube is faulty.  
is heard and frost forms  
in inlet only.  
more than  
ambient  
temperature.  
WHOLE  
CLOG  
Freezer and  
Refrigerator  
don't get cold.  
Flowing sound of Refrigerant Equal to ambient  
• Normal discharging of  
Refrigerant.  
is not heard and frost isn't  
formed.  
temperature.  
MOISTURE  
CLOG  
Cooling operation Flowing sound of Refrigerant Low than  
• Cooling operation restarts  
when heating the inlet of  
capillary tube.  
stops periodically. is not heard and frost melts.  
ambient  
temperature  
COMP-  
RESSION  
Freezer and  
Refrigerator  
don't get cold.  
Low flowing sound of  
Refrigerant is heard and  
frost forms in inlet only.  
A little high  
than ambient  
temperature.  
• The pressure of high  
pressure part in  
compressor is low.  
NO COMP- No compressing  
RESSION operation.  
Flowing sound of Refrigerant Equal to ambient  
is not heard and no frost. temperature.  
• No pressure of high pressure  
part in compressor.  
Leakage Detection  
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.  
Whether frost  
forms or not in  
Evaporator.  
Whether oil leaks  
or not.  
Whether Compressor  
runs or not.  
YES  
No frost or forms  
in inlet only  
Normal formed frost  
Observe the discharging  
amount of Refrigerant.  
Normal amount  
YES  
No or much amount  
Inject Refrigerant to  
Compressor and check  
cooling operation.  
Faulty  
Compressor.  
Moisture Clog.  
Check Comprossor  
Clogged by dust.  
- 14 -  
Gas leakage.  
(Check the leakage point)  
Normal formed  
frost in Evaporator  
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General Control of Refrigerating Cycle  
NO.  
ITEMS  
CONTENTS AND SPECIFICATIONS  
(1) H 30  
(1) • Chemical Ingredients  
(1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20%  
(1) • Brazing Temperature: 710~840°C  
(2) Bcup-2  
REMARKS  
WELDING  
ROD  
• Recommend H34 containing 34% Ag in the  
Service Center.  
1
(1) • Chemical Ingredients  
(1) • Cu: About 93%  
(1) • P: 6.8~7.5%  
(1) • The rest: within 0.2%  
(1) • Brazing Temperature: 735~840°C  
FLUX  
(1) • Ingredients and how to make  
(1) ••Borax 30%  
• Make amount for only a day.  
Holding period: 1 day  
(1)  
(1) ••Borax 35%  
(1) • Fluoridation kalium: 35%  
(1) • Water: 4%  
• Close the cover of container to prevent dust  
putting in the FLUX.  
• Keep it in a stainless steel container.  
2
3
(1) • Mix the above ingredients and boil until  
(1) • they are transformed into liquid.  
DRIER  
ASM  
(1) Assemble the drier within 30min.  
(1) after unpacking.  
(2) Keep the unpacked drier at the temperature  
of 80~100°C.  
• Don't keep the drier in a outdoor because  
humidity damages to it.  
VACUUM  
(1) When measuring with pirant Vacuum  
(1 )gauge of charging M/C, vacuum  
(1 )degree is within 1 Torr.  
• Apply M/C Vacuum Gauge without fail.  
• Perform vacuum operation until a proper  
vacuum degree is built up.  
(2) If the vacuum degree of the cycle inside is  
(2) 10 Torr. below for low pressure and 20 Torr.  
(2) for high pressure, it says no vacuum  
(2) leakage state.  
• If a proper vacuum degree isn't built up,•  
check the leakage from  
the Cycle Pipe line part and  
4
Quick Coupler Connecting part.  
(3) Vacuum degree of vacuum pump must be  
(3) 0.05 Torr. below after 5 min.  
(4) Vacuum degree must be same to the  
value described item (2) above for more than  
20 min.  
DRY AND  
AIR  
(1) The pressure of dry air must be more  
than 12~16Kg/cm2  
NITROGEN  
GAS  
(2) Temperature must be more than  
5
-20~-70°C.  
(3) Keep the pressure to 12~6Kg/cm2 also  
(3) when substituting dry air for Nitrogen Gas.  
NIPPLE  
AND  
COUPLER  
(1) Check if gas leaks with soapy water.  
(2) Replace Quick Coupler in case of leakage.  
• Check if gas leaks from connecting part of  
Coupler.  
6
7
PIPE  
(1)• Put all Joint Pipe in a clean box and  
(1)• cover tightly with the lid so that dust or  
(1)• humidity is not inserted.  
- 15 -  
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7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM  
The following description is basically for GR-S552/GR-S592. For the other models, refer to the diagram of the entire PCB  
circuit.  
7-1 FUNCTION  
7-1-1 FUNCTION  
1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to  
‘Medium’‘Medium/High’‘High’‘Low’‘Medium/Low’‘Medium’ in order.  
2. When the power is initially applied or restored after a power failure, it is automatically set to ‘Medium’.  
Low  
6
Medium/Low  
4.5  
Medium  
Medium/High  
0.5  
High  
-1  
Temp  
Control  
TEMP(°C)  
2.5  
REFRIGERATOR  
ROOM  
7-1-2 CONTROL OF VARIABLE SPEED FAN IN THE FREEZER COMPARTMENT  
1. Fan motor in the freezer compartment shall change from standard to high speed rpm in order to increase cooling speed  
and load corresponding speed.  
2. High speed rpm is only used for the initial power application and load corresponding operation. But standard rpm is used  
in the general working condition.  
3. When the door of freezer room or refrigerator room is opened, the fan motor is stoped immediately, then when the door is  
closed, the fan motor is operated.  
7-1-3 CONTROL OF DOUBLE COOLING FAN IN THE REFRIGERATOR COMPARTMENT  
1. To raise the refrigerating speed, fan motor in the refrigerator compartment is operated when the door of freezer room or  
refrigerator room is opened and then closed.  
2. The fan motor is stoped after 20 sec. When the door is dosed.  
- 16 -  
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7-1-4 DEFROSTING  
1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours.  
2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the  
compressor reaches 4 hours.  
3. When the temperature of the defrosting sensor reaches 10 °C or above, the defrosting stops. If the temperature does not  
reach 10 °C in 2 hours after the defrosting starts, the defrosting error code is displayed.  
(Refer to 7-1-6 Error Diagnostic Mode.)  
4. With the defective defrosting sensor (cut or short-circuited wire), the defrosting will not be performed.  
7-1-5 SEQUENTIAL OPERATION OF ELECTRIC COMPONENTS  
The electric components, such as the comp, defrosting heater, and cooling fan, start sequentially to avoid the noise and  
damage to the part, which may result from the simultaneous start of various components on turning the power on or after  
the completion of a test.  
Condition of Operation  
Operating Sequence  
If the temp of the defrosting  
sensor is 45 °C or above  
(For the initial use after the  
purchase or grounding)  
POWER  
ON  
in 0.5 sec  
in 0.5 sec  
COMP & COOLING FAN  
ON  
POWER  
ON  
DEFROSTING  
HEATER ON  
in 10 sec  
DEFROSTING  
HEATER OFF  
If the temp of the defrosting  
sensor is below 45 °C  
(After a power failure or SVC)  
in 0.5 sec COMP & COOLING FAN  
ON  
- 17 -  
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7-1-6 ERROR DIAGNOSTIC MODE  
1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while  
operating the product.  
2. Even if the function control button is pushed when an error occurs, the function will not be performed.  
3. When the error is cleared while the error code is displayed due to a fault, the appliance returns to the normal condition  
(Reset).  
4. The error code is displayed by the refrigerator temp indication LED on the display of the refrigerator while the remaining  
LEDs are off.  
R1 R2 R3 R4  
: ON  
: OFF  
Error Code Display  
R1 R2 R3 R4  
State of Operation with Error  
NO  
Error  
Cause  
Comp / Cooling fan Defrosting heater  
Faulty refrigerator(R)  
sensor (on the control  
box of the refrigerator)  
Cut or short-circuited wire of  
refrigerator sensor  
15 min ON/  
15 min OFF  
1.  
Cut or short-circuited wire of  
defrosting sensor  
No defrosting  
2. Faulty defrosting sensor  
Cut or disconnected wire of  
defrosting heater or temperature  
fuse(indicated at least 2 hours  
later after the error occurs)  
3.  
Defrosting failure  
- 18 -  
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7-2 PCB FUNCTION  
7-2-1 POWER CIRCUIT  
The secondary part of the TRANS is composed of the power supply for the display and relay drive (12Vdc) and that for the  
MICOM and IC (5Vdc).  
The voltage for each part is as follows.  
PART  
VA 1  
CE 2  
CE3  
VOLTAGE  
220 Vac  
12 Vdc  
5 Vdc  
VA1 is a part for preventing the over voltage and noise. When 385V or higher power is applied, the inside elements are  
short-circuited and broken, resulting in the blowout of the fuse in order to protect the elements of the secondary part of the  
TRANS.  
- 19 -  
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7-2-2 OSCILLATION CIRCUIT  
This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data from and to the  
inside logic elements of the IC1(MICOM). Be sure to use the authentic parts since the calculating time by the IC1 may be  
changed or it will not work if the OSC1 SPEC is changed.  
7-2-3 RESET CIRCUIT  
The RESET circuit is for allowing all the functions to start at the initial conditions by initializing various parts including the  
RAM inside the MICOM (IC1) when the power is initially supplied or the power supply to the MICOM is restored after a  
momentary power failure. For the initial 10ms of power supply, ‘LOW’ voltage is applied to the MICOM RESET terminal.  
During a normal operation, 5V is applied to the RESET terminal. (If a trouble occurs in the RESET IC, the MICOM will not  
work.)  
- 20 -  
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7-2-4 LOAD DRIVE CIRCUIT  
1. Load Drive Condition Check  
Freezer Fan Motor  
High RPM Standard RPM  
No. 14  
Double Cooling  
Fan Motor (R-Fan)  
No. 12  
Defrosting  
Heater  
Comp  
Load Type  
Measurement Location (IC5)  
No. 16  
No. 13  
No. 15  
1V or below  
12V  
ON  
Condition  
OFF  
- 21 -  
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7-2-5 TEMPERATURE SENSOR CIRCUIT  
The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM.  
OPENING or SHORT state of each TEMPERATURE SENSOR are as follows.  
SENSOR  
CHECK POINT  
NORMAL(-30 °C ~ 50 °C)  
SHORT-CIRCUITED  
OPEN  
A
B
Refrigerator Sensor  
Defrosting Sensor  
POINT  
POINT  
Voltage  
Voltage  
0.5 V ~ 4.5 V  
0 V  
5 V  
7-2-6 DOOR OPEN DETECTION CIRCUIT  
Measurement Location  
Freezer / Refrigerator Door  
(Pin No.13)  
Closed  
Open  
0V  
5V  
- 22 -  
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7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT  
1. Refrigerator Temperature Compensation  
Refrigerator  
Resistance  
(RCR1)  
180 K  
56 KΩ  
33 KΩ  
18 KΩ  
12 KΩ  
10 KΩ  
8.2 KΩ  
5.6 KΩ  
3.3 KΩ  
2 KΩ  
Temperature  
Compensation  
+2.5 °C  
+2.0 °C  
+1.5 °C  
+1.0 °C  
+0.5 °C  
0 °C  
Remark  
Compensation by  
raising the  
temperature  
Standard Temperature  
-0.5 °C  
Compensation by  
lowering the  
temperature  
-1.0 °C  
-1.5 °C  
-2.0 °C  
470 Ω  
-2.5 °C  
Table of Temperature Compensation by adjusting the resistance (Difference with the current temperature)  
E.g.) If the refrigerator compensation resistance (RCR1) is changed from 10K (the current resistance) to 18K  
(the adjustment resistance), the temperature of the refrigerator rises +1.0 °C.  
- 23 -  
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7-2-8 KEY BUTTON INPUT & DISPLAY LIGHT ON CIRCUIT  
The circuit shown above is to determine whether a function control key on the operation display is pushed and to turn on  
the corresponding function indication LED. The drive type is the scan type.  
- 24 -  
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7-3 RESISTANCE SPECIFICATION OF SENSOR  
TEMPERATURE SENSOR  
RESISTANCE OF REFRIGERATOR  
(DEFROST) SENSOR  
- 20 ˚C  
- 15 ˚C  
- 10 ˚C  
- 5 ˚C  
77 K  
60 KΩ  
47.3 KΩ  
38.4 KΩ  
30 KΩ  
0 ˚C  
+ 5 ˚C  
24.1 KΩ  
19.5 KΩ  
15.9 KΩ  
13 KΩ  
+ 10 ˚C  
+ 15 ˚C  
+ 20 ˚C  
+ 25 ˚C  
+ 30 ˚C  
+ 40 ˚C  
+ 50 ˚C  
11 KΩ  
8.9 KΩ  
6.2 KΩ  
4.3 KΩ  
• The resistance of SENSOR has ±5% common difference.  
• Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature.  
This postponing is necessary because of perceiving speed.  
• Measure the F-SENSOR, SUPER FROST SENSOR, R1, R2-SENSOR after disconnect CON5 of PWB ASSY, MAIN.  
- 25 -  
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- 26 -  
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- 27 -  
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7-5 MAIN PWB ASS'Y AND PARTS LIST  
7-5-1 MAIN PWB ASS'Y  
1. R-B52DZ/R-B55DZ  
- 28 -  
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7-5-2 REPLACEMENT PARTS LIST  
- 29 -  
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7-5-3 PWB ASS'Y, DISPLAY AND PARTS LIST  
- 30 -  
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7-6 PWB DIAGRAM  
- 31 -  
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- 32 -  
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8. EXPLODED VIEW  
The parts of refrigerator and the shape of each part are subject to change in different localities.  
: optional parts  
*
301A  
281A  
401A  
103B  
103A  
281B  
281C  
129A  
411A  
501F  
501A  
418A  
410G*  
410H*  
409A  
282A  
406B  
158B  
282B  
501K  
158A  
304A  
410J  
105A  
317A  
283B  
318A  
409B  
310A  
307A  
106A  
314A  
308A  
309A  
323B  
158C  
104A  
106A  
329C  
420A  
327A  
328A  
312A  
328B  
319A  
329D  
158F  
120A  
315A  
319C  
103C  
315B  
315C  
324A  
- 33 -  
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: optional parts  
*
405C  
200A  
404A  
405C  
330B  
405A  
203A  
205A  
201A  
329A  
332A  
212G  
*
205A  
212A  
212C  
125A  
*
149A  
*
125H  
*
131C  
*
*
149A  
*
*
210B  
210A  
131A  
136A  
131A  
*
136B  
125A  
*
*
230A  
125A  
*
235A  
149B  
233A  
*
234B  
149B  
233B  
*
*
231A  
136N  
136P  
*
149C  
*
140A  
205A  
*
or  
241A  
149C  
*
244A  
244C  
136Q  
*
136R  
241C  
*
154A  
205A  
or  
241A  
151A  
241D  
243A  
243B  
155K  
151A  
- 34 -  
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