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The above circuits are circuits attached to freezing room sensor or cold storage room sensor for adjusting setting
temperature at the freezing room and cold storage room, ice-making sensor for sensing water temperature in ice-making, or
an evaporator for sensing temperature of a frost removal sensor necessary for frost removal. Short or open status of every
temperature sensor is as follows:

<GC-B/C207: Bar, Dot-LED>

A

E

B

D

C

SENSOR

CHECK POINT

NORMAL(-30 °C ~ 50 °C)

IN SHORT

IN OPEN

Freezing sensor

POINT A Voltage

Frost removal sensor

POINT B Voltage

Cold storage sensor 1

POINT C Voltage

0.5 V~4.5 V

0 V

5 V

Cold storage sensor 2

POINT D Voltage

Room temperature sensor

POINT E Voltage

EXPLATION FOR MICOM CIRCUIT

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Summary of Contents for GC-B207

Page 1: ...EASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL Ref No GC L207 Ref No GC C207 Ref No GC B207 Ref No GC P207 http biz lgservice com ...

Page 2: ...CUIT FOR WEAK COLD OVER COLD AT FREEZING ROOM 60 PWB PARTS DRAWING AND LIST 61 PWB CIRCUIT DIAGRAM 76 ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 86 WORKING PRINCIPLES 86 FUNCTION OF ICE MAKER 87 ICE MAKER TROUBLESHOOTING 90 ICE MAKER CIRCUITS 91 CIRCUIT 93 TROUBLE DIAGNOSIS 95 TROUBLE SHOOTING 95 FAULTS 105 COOLING CYCLE HEAVY REPAIR 122 HOW TO DEAL WITH CLAIMS 126 HOW TO DISASSEMBLE AN...

Page 3: ...em 7 Make sure the hook is correctly engaged Remove dust and foreign materials from the housing and connecting parts 8 Do not fray damage machine heavily bend pull out or twist the power cord 9 Please check the evidence of moisture intrusion in the electrical components Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed 10 Do not touch the icemaker with hands or...

Page 4: ...R Wire Condenser REFRIGERANT R600a 82g LUBRICATING OIL MO 7 350 cc DRIER MOLECULAR SIEVE XH 9 CAPILLARY TUBE ID 0 85 1750 1720 1750 600 948 890 666 711 725 1133 5 Front View Plane View 1 Ref No GC P207 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater Home Bar Heater ANTI FREEZING HEA...

Page 5: ...CONDENSER Wire Condenser REFRIGERANT R600a 82g LUBRICATING OIL MO 7 350 cc DRIER MOLECULAR SIEVE XH 9 ITEMS SPECIFICATIONS CAPILLARY TUBE ID 0 85 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Dispenser Duct Door Heater Dispenser Heater ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA DISPENSER LAMP 15W 1 EA 17...

Page 6: ... EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R600a 82g LUBRICATING OIL MO 7 350 cc DRIER MOLECULAR SIEVE XH 9 CAPILLARY TUBE ID 0 85 1750 1720 1750 600 948 890 666 711 725 1133 5 Front View Plane View 3 Ref No GC C207 ITEMS SPECIFICATIONS FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI SWEAT HEATER Home Bar Heater ANTI FREEZING HEATER Damper...

Page 7: ...T C Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R600a 82g LUBRICATING OIL MO 7 350 cc DRIER MOLECULAR SIEVE XH 9 ITEMS SPECIFICATIONS CAPILLARY TUBE ID 0 85 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI FREEZING HEATER Damper Heater FREEZER LAMP 40W 1 EA REFRIGERATOR LAMP 40W 1 EA 1750 1720 1750 600 948 890 666 711 725 1133 5...

Page 8: ...2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Refreshment center Optional Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Cover Hinge Home Bar Frame Display Cover PWB Water Tube Dispenser Lamp Ice Water Dispenser Button ...

Page 9: ...r Lamp Shelf Door rack 1piece or 2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Refreshment center Optional Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Cover Hinge Home Bar Frame Display Cover PWB Water Tube Dispenser...

Page 10: ...oor rack 1piece or 2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Cover PWB Water Tube Cover Hinge Frame Display Dispenser Lamp Ice Water Dispenser Button 3 Ref No GC L207 I...

Page 11: ...oor rack Lower cover Lamp Shelf Door rack 1piece or 2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Cover PWB Water Tube Cover Hinge Frame Display Dispenser Lamp Ice Water Di...

Page 12: ...oduct corner Lamp Shelf Door rack 1piece or 2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Refreshment center Optional Cover Hinge Home Bar Cover PWB 1 Ref No GC C207 ...

Page 13: ...k product corner Lamp Shelf Door rack 1piece or 2piece Door rack 1piece or 2piece Door rack Shelf Snack drawer Optional Shelf Folding or Normal Egg box Vegetable drawer 1 or 2 Miracle Zone Optional Fresh compartment Optional Conversion switch Meats Vegetables Optional Optional Humidity switch Wine holder Plastic or wire Refreshment center Optional Cover Hinge Cover PWB 2 Ref No GC B207 ...

Page 14: ...frigerator compartment 2 If the height of freezer door is higher than that of refrigerator compartment Insert a driver into the groove of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal Insert a driver into the groove of adjusting screw and rotate driver in arrow direction clockwise until the refrigerator becomes horizontal HOW TO INSTALL RE...

Page 15: ...firm the following installation parts HOW TO INSTALL REFRIGERATOR 15 Class Shape and Spec Nomenclature P No Remarks Valve Feed 5221JA3001A Common Use Connector MECH Pipe 4932JA3003A Conversion Connector 3 4 6631JA3004A No Holes Balance Conector 3 4 6631JA3004B Packing ø24x3t 3920JA3001B Connector MECH Pipe 4932JA3003B Conversion Connector W25 6631JA3004C No Holes Balance Conectoor W25 6631JA3004D ...

Page 16: ...nser button for 2 3 minutes and confirm that the water comes out Caution Feed pipe should be connected to cold water line If it is connected to hot water line trouble may occur Please check rubber packing when connecting feed pipe 2 Check leakage at connecting part then arrange water tube and locate the refrigerator at its regular place if there is no leaking HOW TO INSTALL REFRIGERATOR 16 Single ...

Page 17: ...ure drops Use standard feed tube to prevent leaking Outternal Filter 1 Filter Fixation 1 There are two types of filter One is nut type and the other is connector type 2 Connect feed tube to the filter outlet and water valve connecting tube 3 Fix the filter at proper place around the sink where it is easy to replace the filter and to receive the cleaning water Please consider the length of tube sha...

Page 18: ...turning it clockwise by 90 degrees Note Check that the guideline and the fastening indication line are aligned 2 Replacement of water filter While holding the lower part of the filter turn it counterclockwise by 90 degrees and pull it down Note Check that the guideline and the loosening indication line are aligned After installing water filter Reassemble the lamp cover and the top shelf of the ref...

Page 19: ...wn below 2 The bell rings ding dong and ice tray rotates and water comes out from the icemaker water tube 3 The water shall be supplied two or three times into the tray The amount of water supplied for each time is small Put a water container under the ice tray and press test switch 4 When ice tray rotates the water in it will spill Collect the spilt water and throw away into the sink 5 When ice t...

Page 20: ...ns when too much water is supplied into the ice tray Caution When adjusting the amount of water supplied adjust step by step Otherwise the water may spill over 3 When adjustment of control switch for the amount of water supplied is complete check the level of water in the ice tray HOW TO INSTALL REFRIGERATOR 20 Driver 1 ON Switch ON Switch OFF 2 3 Confirm the amount of water Optimum level The quan...

Page 21: ...adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment EXPRESS FRZ DISPENSER Lock Hold 3 Secs FREEZER REFRIGERATOR Express freezer Lock button Temperature adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment EXPRESS FRZ LOCK FREEZER REFRIGERATOR Express freezer Lock button Temperature adjustment button fo...

Page 22: ...exhibiting a refrigerator in the shopping moll Function is inserted with recognition sound Ding if pressing both the Express FRZ button and the REFRIGERATOR button at the same time for more than 5 seconds If function is inserted all basic refreezing functions at the R F room and the Storage room COMP F FAN C FAN turns off and the display normally operates However the dispenser function normally op...

Page 23: ...trong Weak Middle Weak 3 The temperature setting condition of freezer and refrigerator compartments shall not be indicate in the standard model GC P207 GC L207 GC C207 GC B207 when refrigerator or home bar door is closed MICOM FUNCTION 23 Division Power Initially On 1st Press 2nd Press 3th Press 4th Press Type 1 88 LED Type 2 Bar LED Type 3 Dot LED 19 C 3 C 22 C 2 C 23 C 0 C 15 C 6 C 17 C 4 C Chan...

Page 24: ... 4 Express freezing 1 Express freezing is function to improve cooling speed of the freezing room by consecutively operating compressors and freezing room fan 2 Express freezing is released if power failure occurs and then returns to the original status 3 Temperature setting is not changed even if selecting the express freezing 4 The change of temperature setting at the freezing room or the cold st...

Page 25: ...OFF control by linking with the COMP 2 It controls at the single RPM without varying RPM 3 Failure sensing method is same as in fan motor of freezing fan motor refer to failure diagnosis function table for failure display 2 7 Door opening alarm 1 Buzzer generates alarm sound if doors are not closed even when more than a minute consecutively has passed with doors of freezing cold storage room or ho...

Page 26: ...CTION 26 Function Load Operation Sequence Remark In applying Initial power TEST MODE When temperature of a frost removal sensor becomes more than 45 C In purchase movement If error occurs during operation initial operation is not done If pressing switch once more in the test mode 2 or temperature of a frost removal sensor is more than 5 C it immediately returns to the test mode for initial operati...

Page 27: ...y Note 2 Failure code display part Setting temperature for freezing Setting temperaturefor coldstorage No Item Contents of failure Freezer Fan Compressor Stepping motordamper Defrost Heater M C room Fan Product operation status in failure Failure of freezer sensor Failureofrefrigerator sensor1 Failureofrefrigerator sensor2 Failure of frost removal sensor Poor of frost removal FailureofBLDCFAN atfr...

Page 28: ...ff reset 4 Trouble code is indicated by the freezing temperature indicator led in the refrigerator display All leds except trouble code are off DISPENSER Lock Hold 3 Secs EXPRESS FRZ FREEZER REFRIGERATOR CUBE WATER CRUSH FRZ TEMP REF TEMP EXPRESS FRZ EXPRESS FRZ DISPENSER FREEZER REFRIGERATOR FILTER LOCK FRZ TEMP REF TEMP FILTER STATUS DISPENSER BUTTON EXPRESS FRZ ON CUBE WATER CRUSH EXPRESS FRZ C...

Page 29: ...n plug in it again for the normal state 5 If nonconforming contents such as sensor failure are found during performance of test mode release the test mode and display the failure code 6 Even if pressing the test button during failure code display test mode will not be performed Test 1 Test 2 Normal Status Mode Manipulation Content Remarks Press test button once freezing force mode Press test butto...

Page 30: ...nd solenoid are automatically off if there is no signal after 3 minutes when ice crushed and cube or water is selected and dispenser switch is pressed down Solenoid duct door stops after 5 seconds when solenoid is off in order to protect short circuit from solenoid heat generation 5 Dispenser Lamp On Off Function The dispenser lamp shall be on or off whenever dispenser button is pressed or release...

Page 31: ... of the switching terminal to the secondary side and the feedback part IC3 IC4 transferring it to the primary side Caution Since high voltage DC310V is maintained at the power terminal please take a measure after more than 3 minutes have passed after removing power cords in the abnormal operation of a circuit Voltage of every part is as follows GC B C207 88 LED GC B C207 Bar Dot LED Part VA1 CE1 C...

Page 32: ...EXPLATION FOR MICOM CIRCUIT 32 GC P L207 88 LED GC P L207 Bar LED GC P L207 Dot LED ...

Page 33: ...various parts such as RAM inside of MICOM IC1 to initialize and the whole of function to start from the initial status when initial power is input or when power is applied again to MICOM by a spontaneous power failure LOW voltage is applied to the reset terminal of MICOM in the beginning of power supply for a constant time 10ms Reset terminal during general operation is 5V No MICOM operates in fai...

Page 34: ...r cold storage room are connected to the door open sensing circuit in parallel toward both ends of switch to determine door open at MICOM Since a door switch of the home bar is connected to door switch C D of the cold storage room it senses door opening if even one of both is opened The fan motor is immediately stop if opening doors of the freezing room or cold storage room at the TEST mode and it...

Page 35: ...EXPLATION FOR MICOM CIRCUIT 35 GC P L207 Bar LED GC P L207 Dot LED ASSEMBLY ASSEMBLY ...

Page 36: ...re connected to the door open sensing circuit toward both ends of switch to determine door open at MICOM Since a door switch of the home bar is connected to door switch C D of the cold storage room it senses door opening if even one of both is opened EXPLATION FOR MICOM CIRCUIT 36 GC B C207 88 LED P T C ASSEMBLY COMP Measuring part IC6 No 16 No 11 No 10 No 15 No 14 Status ON Within 1 V OFF 12 V Ty...

Page 37: ...R MICOM CIRCUIT 37 GC B C207 Bar Dot LED ASSEMBLY Measuring part IC6 No 16 No 11 No 12 No 15 No 14 Status ON Within 1 V OFF 12 V Type of Load COMP Frost Removal Heater AC Converting Relay R room LAMP Homebar Heater ...

Page 38: ...2 Dispenser operation circuit EXPLATION FOR MICOM CIRCUIT 38 GC P L207 88 LED GC P L207 Bar LED ...

Page 39: ...ED Measuring part Lever S W IC1 Micom No 15 16 On Press OFF 5V 0 V 60 Hz 5 V Measuring part IC6 No 11 IC6 No 10 IC7 No 16 IC7 No 15 IC7 No 13 IC7 No 12 IC7 No 14 Status ON Within 1 V OFF 12 V Type of Load GEARED MOTOR SOLENOID CUBE WATER VALVE ICE WATER SOLENOID DISPENSER HOME BAR HEATER SOLENOID PILOT ...

Page 40: ...3 Door opening sensing circuit EXPLATION FOR MICOM CIRCUIT 40 GC B C207 88 LED GC B C207 Bar Dot LED GC P L207 88 LED GC P L207 Bar LED GC P L207 Dot LED ...

Page 41: ... to sense the door open switch c d or the home bar switch EXPLATION FOR MICOM CIRCUIT 41 Closing 5 V A B C D S W at both ends are at Off status Opening 5 V A B C D S W at both ends are at On status Measuring part IC1 MICOM No 47 46 Pin Door of Freezing Cold Storage Room CONDITIONS Bell sounds when button on Beep sounds when warning MEASURING dosplay is pressed door opening OFF POINTS IC1 No 48 Pin...

Page 42: ...1 5 Temperature sensing circuit EXPLATION FOR MICOM CIRCUIT 42 GC P L207 88 LED GC P L207 Bar LED F A B C D E F C A B D ...

Page 43: ...ure of a frost removal sensor necessary for frost removal Short or open status of every temperature sensor is as follows SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Frost removal sensor POINT B Voltage Cold storage sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Cold storage sensor 2 POINT D Voltage Ice making sensor POINT E Voltage Room temperature sensor POI...

Page 44: ...EXPLATION FOR MICOM CIRCUIT 44 GC B C207 88 LED E A B C D ...

Page 45: ...ensing temperature of a frost removal sensor necessary for frost removal Short or open status of every temperature sensor is as follows GC B C207 Bar Dot LED A E B D C SENSOR CHECK POINT NORMAL 30 C 50 C IN SHORT IN OPEN Freezing sensor POINT A Voltage Frost removal sensor POINT B Voltage Cold storage sensor 1 POINT C Voltage 0 5 V 4 5 V 0 V 5 V Cold storage sensor 2 POINT D Voltage Room temperatu...

Page 46: ...ing it to MICOM Designation of option by model and the application standards are as follows u These circuits are accurately pre adjusted in shipment from factory and so you must not additionally add or remove option EXPLATION FOR MICOM CIRCUIT 46 GC B C207 88 LED GC B C207 Bar Dot LED GC P L207 88 LED GC P L207 Dot LED GC P L207 Bar LED GC B C207 88 LED GC B C207 Bar Dot LED GC P L207 88 LED GC P ...

Page 47: ...1 8 Stepping motor operation circuit EXPLATION FOR MICOM CIRCUIT 47 GC B C207 88 LED GC B C207 Bar Dot LED GC P L207 88 LED GC P L207 Bar LED GC P L207 Dot LED ...

Page 48: ...nd 35 as shown in wave form of the following part These signals are output to the output terminal No 10 11 14 15 via the input terminal No 3 6 8 of the IC10 TA7774F as IC for motor driving Output signals allow motor coils wound on each phase of stator to form rotation magnetic field and the motor to rotate Inputting as below figure to the input terminal INA INB as IC TA7774AF for motor driving all...

Page 49: ...rm a temporary change of speed for the fan motor and applies DC voltage up to 7 5V 16V to motor 3 This circuit performs function not to drive the fan motor further by cutting off power applied to the fan motor in the lock of fan motor by sensing the operation RPM of the fan motor EXPLATION FOR MICOM CIRCUIT 49 a d part b part e part Motor OFF 5V 2V or less 2V or less Motor ON 2 3V 12 14V 8 16V GC ...

Page 50: ...EXPLATION FOR MICOM CIRCUIT 50 GC P L207 Bar LED GC P L207 Dot LED b a e d b a e d ...

Page 51: ...EXPLATION FOR MICOM CIRCUIT 51 GC B C207 88 LED GC B C207 Bar Dot LED b a e d b a e d ...

Page 52: ... and over cool weak cool compensation circuit 1 Temperature compensation at freezing room cold storage room EXPLATION FOR MICOM CIRCUIT 52 GC P L207 88 LED GC P L207 Bar LED GC P L207 Dot LED GC B C207 88 LED GC B C207 Bar Dot LED ...

Page 53: ... C for Freezing room temperature and 2 C for Cold storage room temperature R J1 12kΩ 1kΩ R J2 12kΩ RCRI 5 6kΩ 18kΩ Freezing room Cold storage room Resistance value Temperature Resistance value Temperature Remarks R J1 R J2 compensation RCR1 compensation 5 C 180 kΩ 2 5 C Warmly 4 C 56 kΩ 2 0 C compensate 3 C 33 kΩ 1 5 C 2 C 18 kΩ 1 0 C 1 C 12 kΩ 0 5 C 0 C 10 kΩ 0 C Reference temperature 1 C 8 2 kΩ ...

Page 54: ... 5 6 kΩ Down Down Down change Up Up Up Up Up Up Up 2 C 1 5 C 1 C 0 5 No 0 5 C 1 C 1 5 C 2 C 2 5 C 3 C Cold storage 8 2 kΩ Down Down Down Drop change Up Up Up Up Up Up room 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 2 5 C RCR1 10 kΩ Down Down Down Down Down change Up Up Up Up Up 3 C 2 5 C 2 C 1 5 C 1 C 0 5 C No 0 5 C 1 C 1 5 C 2 C 12 kΩ Down Down Down Down Down Down change Up Up Up Up 3 5 C 3...

Page 55: ...2 Display Circuit EXPLATION FOR MICOM CIRCUIT 55 GC P L207 EXPRESS FRZ DISPENSER FREEZER REFRIGERATOR FILTER LOCK EXPRESS FRZ CUBE WATER CRUSH FRZ TEMP REF TEMP FILTER STATUS DISPENSER BUTTON ON ...

Page 56: ...EXPLATION FOR MICOM CIRCUIT 56 EXPRESS FRZ CHILD LOCK LOCK EXPRESS FRZ FREEZER REFRIGERATOR FRZ TEMP REF TEMP GC B C207 ...

Page 57: ...It is driven by SCAN method EXPLATION FOR MICOM CIRCUIT 57 GC P L207 88 LED GC P L207 Bar LED PCB ASSEMBLY DISPLAY PWBASSEMBLY DISPLAY EXPRESS FRZ DISPENSER FREEZER REFRIGERATOR FILTER LOCK EXPRESS FRZ CUBE WATER CRUSH FRZ TEMP REF TEMP FILTER STATUS DISPENSER BUTTON ON EXPRESS FRZ DISPENSER FREEZER REFRIGERATOR FILTER LOCK FRZ TEMP REF TEMP FILTER STATUS DISPENSER BUTTON EXPRESS FRZ ON CUBE WATER...

Page 58: ...EXPLATION FOR MICOM CIRCUIT 58 GC P L207 Dot LED PWBASSEMBLY DISPLAY DISPENSER Lock Hold 3 Secs EXPRESS FRZ FREEZER REFRIGERATOR CUBE WATER CRUSH FRZ TEMP REF TEMP EXPRESS FRZ ...

Page 59: ... MICOM CIRCUIT 59 EXPRESS FRZ CHILD LOCK LOCK EXPRESS FRZ FREEZER REFRIGERATOR FRZ TEMP REF TEMP EXPRESS FRZ CHILD LOCK LOCK EXPRESS FRZ FREEZER REFRIGERATOR FRZ TEMP REF TEMP GC B C207 88 LED GC B C207 Bar Dot LED ...

Page 60: ...D Compensation Compensation for weak cold for over cold Temperature compensation value Remarks JCR3 JCR4 JCR1 JCR2 at cold storage room 0 C In shipment from factory CUT 1 C CUT 1 C CUT 1 C CUT 1 C CUT CUT 2 C CUT CUT 2 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT 0 C CUT CUT CUT 1 C CUT CUT CUT 1 C CUT CUT CUT CUT 0 C Temperature compensation in CUT JCR1 1 C 2 C JCR2 1 C JCR3 1 C 2 C JCR4 1 C EXP...

Page 61: ...3 PWB Parts Drawings and List 3 1 PWB Assembly Main Parts Drawings EXPLATION FOR MICOM CIRCUIT 61 GC P L207 88 LED ...

Page 62: ...EXPLATION FOR MICOM CIRCUIT 62 GC P L207 Bar LED ...

Page 63: ...EXPLATION FOR MICOM CIRCUIT 63 GC P L207 Dot LED ...

Page 64: ...EXPLATION FOR MICOM CIRCUIT 64 GC B C207 88 LED ...

Page 65: ...EXPLATION FOR MICOM CIRCUIT 65 GC B C207 Bar Dot LED ...

Page 66: ...3 2 Parts List EXPLATION FOR MICOM CIRCUIT 66 GC P L207 88 LED ...

Page 67: ...EXPLATION FOR MICOM CIRCUIT 67 GC P L207 88 LED ...

Page 68: ...EXPLATION FOR MICOM CIRCUIT 68 GC P L207 Bar LED ...

Page 69: ...EXPLATION FOR MICOM CIRCUIT 69 GC P L207 Bar LED ...

Page 70: ...EXPLATION FOR MICOM CIRCUIT 70 GC P L207 Dot LED ...

Page 71: ...EXPLATION FOR MICOM CIRCUIT 71 GC P L207 Dot LED ...

Page 72: ...EXPLATION FOR MICOM CIRCUIT 72 GC B C207 88 LED ...

Page 73: ...EXPLATION FOR MICOM CIRCUIT 73 GC B C207 88 LED ...

Page 74: ...EXPLATION FOR MICOM CIRCUIT 74 GC B C207 Bar Dot LED ...

Page 75: ...EXPLATION FOR MICOM CIRCUIT 75 GC B C207 Bar Dot LED ...

Page 76: ...4 PWB circuit diagram PWB circuit diagram may vary a little bit depending on actual condition GC P L207 88 LED EXPLATION FOR MICOM CIRCUIT 76 ...

Page 77: ...EXPLATION FOR MICOM CIRCUIT 77 PCB ASSEMBLY DISPLAY PCB ASSEMBLY MAGIC DISPLAY ...

Page 78: ... GC P L207 Bar LED EXPLATION FOR MICOM CIRCUIT 78 ...

Page 79: ...EXPLATION FOR MICOM CIRCUIT 79 PWBASSEMBLY DISPLAY ...

Page 80: ... GC P L207 Dot LED EXPLATION FOR MICOM CIRCUIT 80 ...

Page 81: ...EXPLATION FOR MICOM CIRCUIT 81 PWBASSEMBLY DISPLAY ...

Page 82: ... GC B C207 88 LED EXPLATION FOR MICOM CIRCUIT 82 ...

Page 83: ...EXPLATION FOR MICOM CIRCUIT 83 PCB ASSEMBLY MAGIC DISPLAY ...

Page 84: ... GC B C207 Bar Dot LED EXPLATION FOR MICOM CIRCUIT 84 ...

Page 85: ...EXPLATION FOR MICOM CIRCUIT 85 PWBASSEMBLY DISPLAY ...

Page 86: ... be dispensed if there is ice in the ice bank 7 When dispenser water rubber button is pressed water valve opens and water is supplied if water valve is normally installed on the right side of the machine room 8 Ice and water are not available when freezer door is open ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 86 Level Ice Maker Cube Mould for Initial Control after power is input Power ...

Page 87: ...r supply water shall be supplied for the previous setting time But it will supply for the amended time from the next supply 4 When water supply signal is applied to water and ice valves at the same time during water supply water shall be supplied to water valve If water supply signal is applied to ice valve during water supply water shall be supplied to both water and ice valves 2 3 Ice Making Con...

Page 88: ... when ice ejection motor rotates in normal direction If there is no change in Hall IC signals within 1 minute after ice ejection motor operates ice ejection motor stops as ice ejection motor or hall IC is out of order 5 If ice ejection motor or Hall IC is abnormal ice ejection motor rotates in normal direction to exercise initial operation It resets the ice maker if ice ejection motor or Hall IC i...

Page 89: ...hen test function performs normally buzzer sounds and water supply shall carry out Check it for repair if buzzer does not sound 4 When water supply is completed the cycle operates normally as follows Ice making Ice ejection Returning to horizontal conditions Water supply 5 Remove ice from the ice maker cube mould and press test switch when ice maker cube mould is full of ice as ice ejection and wa...

Page 90: ...heck Failed Ice Maker Unit Is the resistance of both ends 9 10 of ice ejection motor of CON8 between 18 and 22Ω Is ice ejection motor drive circuit IC11 and peripheral circuits normal Defects between Hall IC and Board Pin No 42 of IC1 Confirm ice ejection and level return when pressing test switch Replace Ice Maker Unit Replace Main PWB Are ice ejection and level return normal when test switch is ...

Page 91: ...4 Ice Maker Circuits ICE MAKER AND DISPENSER WORKING PRINCIPLES AND REPAIR 91 GC P L207 88 LED GC P L207 Bar LED ...

Page 92: ... not work during ice ejection and water supply It works when it is in the horizontal conditions If cube mould is full of ice during test function operation ice ejection control and water supply control do not work 3 Ice ejection carries out irrespect of ice formation in the ice making tray if test switch is pressed for more than 0 5 second Water shall be splashed if test switch is pressed before t...

Page 93: ...CIRCUIT 93 GC P L B C207 Bar LED ...

Page 94: ...CIRCUIT 94 GC P L B C207 88 LED ...

Page 95: ... Bad connection between plug and adapter faulty plug The distance between pins Pin outer diameter No power on power cord O L P is off No electric power on compressor Faulty compressor Faulty PTC Disconnectedcopperwire Internalelectricalshort Faultyterminalcontact Disconnected Capacity of O L P is small CharacteristicsofO L Pisbad Badconnection Poweris disconnected InnerNi Crwireblowsout Bad intern...

Page 96: ...itintheair Moisturepenetration intotherefrigerationoil Capsaremissed Airblowing Duringtransportation During work Notperformed Performed Tooshorttime Lowairpressure Lessdryair AirBlowing Leaveitintheair Capsaremissed Shortpipeinsert Pipe gaps Toomuchsolder Toolarge Damagedpipes Notdriedinthecompressor Elapsedmorethan6monthsafterdrying Capsaremissed Nopressurewhenitisopen During rest time Afterwork ...

Page 97: ...oreignmaterials penetration Cap drain is not disconnected Injectthroughthe hole Seal with drain P U lump input Screw input Otherforeignmaterials input Parts disconnected Wire is cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Dentbyfineevaporator Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check terminal Conduction OK No conduction NG If wire is...

Page 98: ...ocation thickness Structural fault Gasket gap Airinflowthroughthefanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate rated Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Self locked Wire is cut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contractioninner liner Misalignment Badt...

Page 99: ...constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Bad shape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunction of charging cylinder Wrongsettingofrefrigerant Insufficient compressor Faulty compressor Fanoverload Fanmisuse ...

Page 100: ... dump liquid Faulty contact Faulty temperature characteristics External air inflow Rubber motor assembly direction reverse Door opens but not closes Gap around gasket Contraction distortion loose door twisted corner not fully inserted Food vapor Storing hot food Unsealed food Door opens but not closes Gasket gap Cool air leak and transmitted Highambienttemperature Space is secluded Differentrating...

Page 101: ...or compartment operating sounds Compressor sound Sound from machine itself inserted Sound from vibration Restrainer Rubber Too hard seat Distorted Aged Burnt Stopper Bad Stopper Not fit assembly inner diameter of stopper Tilted Not Compressor base not connected Bad welding compressor stand fallen Foreign materials in the compressor compartment O L P sound Chattering sound Insulation paper vibratio...

Page 102: ...nfault Coregap Bad connection Correct screw connection Bad assembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Not connected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterd...

Page 103: ...Travlel distance Bad connection Bad terminal contact P U liquid leak 1 Lead wire is damaged Wire damage when assembling P T C Cover Outlet burr in the bottom plate Pressed by cord heater lead wire evaporator pipe 2 Exposed terminal Compressor Compartment terminal Touching other components Freezer compartment terminal Touching evaporator pipe 3 Faulty parts Transformer Coil contacts cover Welded te...

Page 104: ...weendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food No deodorizer Poor capacity Seal condition Store special odorous food Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreez...

Page 105: ...d and products Replace with rated fuse Electricity leakage Check the resistance of power cord If fuse blowns out High voltage with testerf if it is 0Ω it is shorted frequently reconfirm Short circuit of components the cause and prevent tracking due to moisture and dust penetration Problems Causes Checks Measures Remarks Compressor Faulty PTC Check the resistance If resistance is infinite replace i...

Page 106: ...button faulty operation Confirm icing causes and repair switch operation Press button to check Replace door switch Faulty button pressure and contact Press button to check operation Door cannot press door switch Door sag fix door button Check visually Door liner bent replace door or attach sheets Bad radiation conditions in Check the clearance between the Keep clearance between The fan may be comp...

Page 107: ...w pressure side 3 Check silver soldered parts Cu Fe Fe Fe 4 Check bending area of wire condenser pipe in compressor compartment cracks can happen during bending 5 Check other parts compressor compartment and evaporators in freezer compartment Shortage of refrigerant Check frost formation on the surface Find out the leaking area repair Drier must be replaced of evaporator in the freezer evacuate an...

Page 108: ...e weld If it is warm it s OK joints might be clogged If it is not condenser outlet weld Disconnect with torch remove the joints might be colgged causes evacuate and recharge seal refrigerant Leak at loop pipe weld joint Check sequence Replace the compressor weld Drier must be replaced discharge in compressor 1 Manually check whether evacuate and recharge refrigerant condenser is warm It is not war...

Page 109: ...impurities by inserting are clogged of ice insert the copper line copper wire Turn off more than 1 Impurities through the hole to check 3hours and pour in hot water if 2 Ice 2 Put hot water into the drain frost is severe check drains outside 2 Put in hot water to melt down frost 3 Check the water outlet 4 Push the heater plate to sucking duct manually and assemble the disconnected parts Gap betwee...

Page 110: ...k by inserting soft copper 3 Reassemble the heater plate wire into the duct soft and thin copper not to impair heating wire Bad cool air inflow and discharge 1 Turn on power open or close the 1 Check the faulty connector of and bad defrosting due to faulty door check that motor fan housing and reassemble wrongly contact and insertion bad connector operates If it operates motor fan assembled parts ...

Page 111: ...gasket attachment Replacement should compartment Check door assembly conditions conditions and replace it be done when it Faulty gasket Door assembly and replacement cannot be repaired Faulty assembly 3 Overcooling in the refrigerator Check refrigerator compartment Replace faulty parts compartment is overcooled when button Faulty damper in the refrigerator pressed on weak compartment Check parts a...

Page 112: ...partment door Check gasket attachment Correct the gasket attachement Replace when it can not Icing in the Faulty gasket conditions conditions and replace it be repaired shute Faulty assembly Check door assembly conditions Door assembly and replacement 3 Over freezing in the freezer Refrigerator operates pull down Replace defective parts compartment Check if it is operated Faulty MICOM intermittent...

Page 113: ...r inserting 6 Adjust fan to be in the center of conditions in pipes bell mouth of the fan guide 2 3 Touch pipes with hands or screw 7 Leve a clearance between driver check the change of interfering parts and seal gaps in sound the structures 8 Reassemble the parts which make 3 Fan operation sound in the freezer 3 1 Check fan insertion depth and sound compartment blade damage 9 Leave a clearance if...

Page 114: ...tion with rubber 4 Moving wheel vibration 2 2 Check capillary tube touches and restrainer if it is severe 5 Other structure and parts cover back especially compressor and pipe vibration 3 1 Check compressor stopper 4 Replace compressor stopper if it vibration vibtates severely 4 1 Check vibration of front and rear moving wheels 5 1 Touch other structures and parts Irregular sound 1 It is caused by...

Page 115: ...lain the principles of freezing cycles Water boiling or It happens when refrigerant passes Check the sound when compressor is Explain the principles of freezing cycles flowing sound orifice in accumulator internal pipes by turned on and refrigerant flowing phenomenon by the pressure difference between Check the sound when compressor is internal pressure difference condenser and evaporator turned o...

Page 116: ...inyl wraps Chedk food cleanliness Clean the refrigerator and set button at strong Plastic Odor Odors of mixed food and plastic Check wet food is wrapped with Clean the refrigerator odors plastic bowl and bag Persuade customers not to use It happens in the new refrigerator plastic bag or wraps with wet food or odorous foods Odor from the Odor from the old deodorizer Check the deodorizer odors Dry t...

Page 117: ... 7812 7805 terminals circuit in circuit explanation PCB electric terminal Check fuse in PCB electric Replace PCB fuse fuse is burnt out terminal with a tester STR Parts are Check if STR No 2 and 3 pins Replace parts Applicable to damaged are cut when power is off model with dispenser Abnormal Bad connection Lead Wire connecting Check Lead Wire terminals Reconnect Lead display LED between Main PCB ...

Page 118: ...characteristics table of sensor in circuit Freezer sensor is Confirm the color of sensor in Repair main PCB explanation substituted for other circuits main PCB sensor sensor housing sensor housing Defective freezer fan Fan motor lead wire Check fan motor lead wire Reconnect lead motor is cut with a tester wire Defective door switch Measure the voltage between Replace door Refer to load freezer ref...

Page 119: ...ion Foreign materials in AC Check AC damper baffle Remove foreign damper baffles visually materials Ice formation on AC Check if AC damper Heater Replace AC damper damper baffles wire is cut with a tester or refrigerator control Box Assembly Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor sensor sensor parts refrigerator sensor with a test...

Page 120: ...n Defective Buzzer Defective connecting lead wire from Check lead wire related to door Repair lead wire buzzer continuously main PCB to door switch switch with a tester rings or door Defective door switch parts Refer to door switch in parts repair Replace door switch opening alarm guide does not work Defective Buzzer does Key input wire is cut or bad connector Check input wire with a tester Reconn...

Page 121: ... Lead Wire associated with lever Repair lead wire dispenser are not Main PCB to lever switch switch with a tester dispensed Defective lever switch parts Refer to door switch in parts repair guide Replace lever switch Defective photo coupler IC parts Check voltage change at photo coupler Replace photo output terminals with lever switch coupler IC or PCB pressed It is OK if voltage change is between...

Page 122: ...cle part that has welding joint is hidden in the foam If not hidden inside the whole electric parts must be tested with the LEAKAGE TEST according to the IEC Standard The compressor has a label of the refrigerant R600a Only the SVC man must have an access to the system 3 3 Installation place Must be well ventilated Must be 20m3 or larger Must be no smoking area No ignitable factors must be present...

Page 123: ...igerant is not completely discharged let the refrigerator alone for more 30min in outside After the refrigerant is completely discharged repair any defective parts and replace the dryer At any case you must use the LOKRING for connecting or replacing any part in the cycle No Fire No Welding Connect the Schrader valve to pump with the coupler And then turn the pump on for vacuum state Let the pump ...

Page 124: ... refluence Close the Schrader valve cap after the refrigerant R600a is completely recharged If you use the manifold connected with both the refrigerant R600a cylinder and the vacuum pump simultaneously make sure the pump valve is close After you completely recharge the refrigerant R600a perform the leakage test by using a portable leakage detector or soapy water Test the low pressure suction parts...

Page 125: ...razer Copper Silver Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Silver Brazer PIPE ASSEMBLY JOINT PIPE ASSEMBLY HOT LINE Freezer PIPE ASSEMBLY JOINT CONDENSER ASSEMBLY WIRE PIPE ASSEMBLY SUCTION DRIER ASSEMBLY CAPI TUBE Copper Brazer Copper Silver Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer 1 Asi...

Page 126: ... evaporator in the refrigerator compartment expand and contract as the temperature changes during the refrigerator operation This sound also happens during defrosting twice a day when the ice on the evaporator melts Clunk sound Explain that it comes from the compressor when the refrigerator starts When the refrigerator operates the piston and motor in the compressor rotate at 3600RPM This sound is...

Page 127: ...g also makes sound When water Noise from motor sounds Whizz freezes to ice freezing sounds such as click click are heard When ice is being ejected sounds like Whizz produced by a motor to rotate an ice tray and ice dropping and hitting ice bank sounds are also heard Noise when supplying water Explain the principles of water supplied to dispenser When the water supply button in the dispenser is pre...

Page 128: ...istics of ice cream The freezing point of ice cream is below 15 C Therefore ice cream may melt if it is stored in the door rack Store ice cream in a cold place or set the temperature control button of a freezer at strong position Refrigeration is too strong Check the position of temperature control button Check if refrigeration is strong in whole area of the refrigerator or partly near the outlet ...

Page 129: ...tton at strong Frost in the freezer compartment Explain the basic principles of frost formation The main causes for frosting Door was left open Air penetration through the gasket Too frequent door opening parties etc Hot foods are stored before they are cooled down The temperature of freezer is 19 C if temperature is set at MID If hot air comes into the refrigerator fine frost forms as cold air mi...

Page 130: ...ainer or in the wrap When is the power connected When should the power be connected You can connect the power right after the installation But if the refrigerator was laid flat during transportation for a long period of time and the refrigerant and compressor oils are mixed up then this will affect badly the performance of a refrigerator Be sure to connect the power 2 3 hours after refrigerator is...

Page 131: ...r or bracket hinge pin is deformed during assembling freezer and refrigerator doors fix two screws Tap Tite Screw M6 Hinge L fixing screw in the hole of upper hinge 3 Disconnect upper hinge from a hinge supporter by grasping the front part of upper hinge and lifting up Hinge Assembly U in arrow direction A and pull forward in arrow B direction Be careful as the door may be fallen down 4 Lift up th...

Page 132: ...Disassembly of shroud F U Disconnect housing of B after removing two rail guides with a blade screwdriver 7 Disassembly of shroud F U Hold upper part and pull forward 8 Check foam PU sticking conditions around a shroud F U and F L during assembling If damaged torn or badly sticked assemble with a new one after sealing well 4 ICEMAKER ASSEMBLY 1 Dispenser Model 1 How to disassemble 1 Remove ice ban...

Page 133: ... housing 4 Loosen four screws with a phillips screwdriver and pull a funnel Assembly to disconnect 5 Duct cap Assembly is disconnected if hold lever connecting screw is loosened with a phillips screwdriver 6 For assembling a duct cap Assembly insert one end of a spring into the right hole of dispenser lever and insert the other end into the right hole in upper part of dispenser And then assemble a...

Page 134: ...AY 4 BUTTON DECO 5 BUTTON ASSEMBLY 6 PWB PCB ASSEMBLY DISPLAY 7 FUNNEL ASSEMBLY 8 SWITCH MICRO 9 FRAME FUNNEL 10 LEVER SWITCH 11 FUNNEL 12 DECO FRAME DISPLAY 14 SOLENOID ASSEMBLY 15 SPRING 16 HOLDER LEVER 17 CAP DUCT ASSEMBLY 18 DUCT DOOR ASSEMBLY 19 LEVER DISPENSER 20 RUBBER CAP 21 BUTTON ASSEMBLY 22 BUTTON 23 HOLDER BUTTON 24 DECO DRAIN 17 Cap Assembly Duct Detailed Drawings ...

Page 135: ... a cross driver to disassemble arm Assembly 4 Assemble parts by performing the disassembly in reverse order Note Assemble carefully parts until they are fixed firmly when assembling them Adjust exterior gap by adjusting parts and when assembling HOW TO DISASSEMBLE AND ASSEMBLE 135 1 8 6 7 5 11 10 9 8 7 6 4 3 11 10 9 2 0 3 5 2 2 1 DOOR ASSEMBLY H BAR 7 SCREW TAP TITE ARM 2 SEREW TAP TITE HINGE H B ...

Page 136: ...FREEZER DOOR PART GC P207 GC L207 Optional part EXPLODED VIEW 136 202A 200A 210C 210B 210A 210C 201A 203A 206B 206A 205B 205D 205F 205A 205C 205G ...

Page 137: ...FREEZER DOOR PART GC C207 GC B207 Optional part EXPLODED VIEW 137 202A 200A 210B 210B 210B 210C 201A 203A 210C 206B 206A 205B 205D 205A 205C 205G 205F ...

Page 138: ... VIEW 138 232A 266A 261A 265A 267A 263A 266B 240C 240C 240B 240B 264C 264A 264B 240A 147A 251A 250A 263B 266B 267A 402B 266C 266C 231A 233A 230A 239A 260A 260C 260B 243A 243A 243A 241B 241A 241C 262A 147B 147C 236A 206B 617A 205B 205D 205A 205C 205G 240A 243A 205F 265A ...

Page 139: ...L207 GC B207 REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 139 243A 240A 243A 240B 233A 232A 240C 240C 147A 231A 230A 239A 147B 147C 236A 206B 205B 205D 205A 205C 205G 241B 241A 241C 240A 243A 240A 243A 205F ...

Page 140: ...EW 140 120C 125A 120B 126A 270A 271B 271A 103A 312A 402A 135A 401A 152A 105B 272A 130A 135B 101A 120B 120B 120D 120B 120D 137B 136D 136A 136B 403A 136C 137A 408A 302B 316B 400A 128C 128D 128E 128F 131C 131E 131B 131D 154A 131J 132A 131H 131B 131A ...

Page 141: ...166M 166G 166E 180A 180C 180B 180D 168A 120E 504A 166E 166C 166A 165A 166B 165A 167A 624A 624A 624A 270B 271B 271C 103A 116A 272B 151A 155A 146B 626B 626A 626C 101B 151B 151C 150A 624C 401A 146A 402B 152A 162A 162B 177A 177B 151F 115B 115A 142D 142D 142A 142C 142B 170A 140A 140A 171B 171A 141B 141A ...

Page 142: ... PART Optional part EXPLODED VIEW 142 404B 614A 606A 621B 612A 612B 612C 613A 616E 623A 623A or 623B 618A 622A 616D 404A 610A 611D 611B 625A 616G 619A 601A 605A 602A 607A 600A 603A 603B 604A 616F 627A 624B 619A ...

Page 143: ...ARTMENT Optional part EXPLODED VIEW 143 300A 310B 307A 304A 306A 310A 317B 317A 305C 305B 313A 301A 307A 104A 305C 305B 303C 303B 303D 303A 305A 407A 500A 502B 502A 406A 308A 308C 308B 309C 403B 309B 309A 505A 407B ...

Page 144: ...DISPENSER PART EXPLODED VIEW 144 278A 402C 278G 405A 275A 276A 275C 401C 275D 275B 281A 276B 280A 207A 277A 278B 278C 280B 280C 279A 279B 280D 280E 501A 279C ...

Page 145: ...P No 3828JS8046J NOV 2005 Printed in China ...

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