LG GC-A207 Service Manual Download Page 20

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1-9. Fan motor driving circuit (freezing room)

1. This circuit performs function to make standby power ‘0’ by cutting off power supplied to ICs inside of the fan motor in the

fan motor OFF.

2. This is a circuit to perform 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.

1) GR-A207

EXPLATION FOR MICOM CIRCUIT

- 20 -

Speed

R31

R32

R34

R35

1.5K

1mH

FR107

D10

CE7

CC15

R37

R36

FR107

R33

CC16

R41

R38

R39

R40

R42

D11
FR107

D12
FR107

CE8

CC17

R43

R44

CC18

1mH

1.5K

Summary of Contents for GC-A207

Page 1: ...N PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR REFRIGERATOR SERVICE MANUAL COLOR TITANIUM http biz lgservice com Ref No GR A207NIS MODEL GR A207CTBA ...

Page 2: ... MICOM CIRCUIT 13 EXPLANATION FOR PWB CIRCUIT 13 SENSOR RESISTANCE CHARACTERISTICS TABLE 26 PWB PARTS DIAGRAM AND LIST 27 PWB CIRCUIT DIAGRAM 31 CIRCUIT 33 TROUBLE DIAGNOSIS 34 TROUBLE SHOOTING 34 FAULTS 44 COOLING CYCLE HEAVY REPAIR 61 HOW TO DEAL WITH CLAIMS 68 HOW TO DISASSEMBLE AND ASSEMBLE 73 DOOR 73 HANDLE 74 SHROUD GRILLE FAN 74 EXPLODED VIEW 75 REPLACEMENT PARTS LIST 80 CONTENTS 2 ...

Page 3: ...ndard electrical components when replacing them 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 confirm...

Page 4: ...ng Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 180g LUBRICATING OIL FREOL 15G 320 cc DRIER MOLECULAR SIEVE XH 7 ITEMS SPECIFICATIONS CAPILLARY TUBE 1Ø0 83 FIRST DEFROST 4 5 Hours DEFROST CYCLE 13 15 Hours DEFROSTING DEVICE Heater Sheath ANTI FREEZING HEATER Damper Heater FREEZER LAMP REFRIGERATOR LAMP 40W 1 EA 30W 1 EA DISPENSER LAMP 1750 1720 1750 600 948 890 665 711 ...

Page 5: ...r Hinge Frame Display Cover Lower Ice Tray Freeze Room Drawer Lamp Shelf Vegetable Drawer Shelf Door Rack Door Rack Door Rack Wine Holder optional Dairy Product Corner Door Rack Freezer Compartment Refrigerator Compartment 1 Ref No GR A207 ...

Page 6: ...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 REFRIGERATOR 6 Adjusting Screw...

Page 7: ...ure within refrigerator Refrigeration function is weak in the initial time Please adjust temperature as above after using refrigerator for minimum 2 3 days MICOM FUNCTION 7 Temperature adjustment button for refrigerator compartment Temperature adjustment button for freezer compartment Super freezer Lock button FREEZER REFRIGERATOR LOCK EXPRESS FRZ FRZ TEMP LOCK UNLOCK ON OFF 3SECS REF TEMP Divisio...

Page 8: ...ted whenever pressing the Pressing the other button when selecting LOCK the button does not operate 2 5 Special freezing 1 Special freezing is function to improve cooling speed of the freezing room by consecutively operating compressors and freezing room fan If pressing the special freezing button OFF text of the LED is turned off and ON is immediately turned on 2 Special freezing is cycled in ord...

Page 9: ...he 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 8 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 home bar opened 2 Buzzer rings ...

Page 10: ... of parts in applying initial power and completing test MICOM FUNCTION 10 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 tha...

Page 11: ...or 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 atfreezingroom FailureofBLDCFAN atmachineroom Failure of Com...

Page 12: ... if pressing the test button during failure code display test mode will not be performed LED check function If simultaneously pressing special freezing button and cold temperature adjustment button for a second a back light is turned on and all display LCD graphics on If releasing the button the LCD graphic displays the previous status the back light is turned off LCD graphic and back light ON OFF...

Page 13: ...ng energy of the primary side 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 EXPLATION FOR MICOM CIRC...

Page 14: ...or no operation is done 1 3 Reset circuit The reset circuit is circuit allowing 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 ...

Page 15: ... 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 immediately o...

Page 16: ...or switch of the cold storage room fails to sense the door open switch C D or the home bar switch EXPLATION FOR MICOM CIRCUIT 16 Closing 5 V C D S W at both ends are at Off status Opening 5 V C D S W at both ends are at On status Measuring part IC1 MICOM No 45 Pin Door of Freezing Cold Storage Room ...

Page 17: ... 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 EXPLATION FOR MICOM CIRCUIT 17 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 sen...

Page 18: ...ove circuits are used for designating separation by model as option and notifying 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 18 47 P46 R26 CC11 223 36 R21 4 7K Separation Connection Status Application St...

Page 19: ... and 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 TA7774P 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 TA7774AP for motor driving a...

Page 20: ...an 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 1 GR A207 EXPLATION FOR MICOM CIRCUIT 20 b e c f a d Speed Speed R31 R32 R34 R35 1 5K D9 L3 1mH FR107 D10 CE7 CC15 R37 R36 FR107 R33 CC16 R41 R38 R39 R40 R42 D...

Page 21: ...R J2 1 2kΩ RCRI 5 6kΩ want to compensate 2 C for Freezing room temperature and 2 C for Cold storage room temperature R J1 12kΩ 1kΩ R J2 12kΩ RCRI 5 6kΩ 18kΩ EXPLATION FOR MICOM CIRCUIT 21 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...

Page 22: ... 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 23: ...C 7 C 8 C J2 compensate J1 1 8 kΩ 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C 6 C 7 C J2 compensate J1 910 Ω 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C 6 C Freezing J2 compensate room J1 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C 5 C R J1 R J2 J2 compensate J1 6 C 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C 4 C J2 1 2 kΩ compensate J1 7 C 6 C 5 C 4 C 3 C 2 C 1 C Not 1 C 2 C 3 C J2 2 4 kΩ compensate J1 8 C 7 C 6 C 5 C 4...

Page 24: ... MICOM CIRCUIT 24 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 ...

Page 25: ...he necessary display PCB for driving the display PCB is required Poor communication occurs if a continuous information exchange fail to continue for more than 2 minutes between main MICOM of main PCB and LCD dedicated MICOM for LCD control of display PCB 1 GR A207 EXPLATION FOR MICOM CIRCUIT 25 FREEZER REFRIGERATOR LOCK EXPRESS FRZ FRZ TEMP LOCK UNLOCK ON OFF 3SECS REF TEMP Main MICOM LCD dedicate...

Page 26: ...old storage sensor 1 and 2 shall be measured with a digital tester after separating CON8 of the PWB ASSY and the MAIN part u Resistance of the freezing sensor shall be measured with a digital tester after separating CON7 of the PWB ASSY and the MAIN part EXPLATION FOR MICOM CIRCUIT 26 Measuring Temperature C Freezing Sensor Cold storage sensor 1 2 Frost removal sensor Outside sensor 20 C 22 3 kΩ 7...

Page 27: ...3 PWB parts diagram and list 3 1 PWB Ass y main part diagram 1 GR A207 EXPLATION FOR MICOM CIRCUIT 27 ...

Page 28: ...3 2 Parts list 1 GR A207 EXPLATION FOR MICOM CIRCUIT 28 ...

Page 29: ...3 3 DISPLAY ASSY part diagram 1 GR A207 EXPLATION FOR MICOM CIRCUIT 29 ...

Page 30: ...3 4 DISPLAY circuit diagram 1 GR A207 EXPLATION FOR MICOM CIRCUIT 30 ...

Page 31: ...4 PWB circuit diagram PWB circuit diagram may vary a little bit depending on actual condition 1 GR A207 EXPLATION FOR MICOM CIRCUIT 31 ...

Page 32: ...EXPLATION FOR MICOM CIRCUIT 32 ...

Page 33: ...CIRCUIT 33 ...

Page 34: ...al 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 inte...

Page 35: ...eaveitintheair 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 Duringresttime Afterwor...

Page 36: ...s not disconnected Injectthroughthe hole Seal with drain P Ulumpinput Screw input Otherforeignmaterials input Parts disconnected Wire is cut Heatingwire Contactpoint betweenheating andelectricwire Dentbyfinevaporator Poorterminalcontacts Wire is cut Leadwire Heatingwire Contactpoint betweenheatingand electricwire Heatingwireiscorroded Waterpenetration Badterminalconnection Check visually Check ter...

Page 37: ...fanmotor Badinsulationofcasedoor SheathHeater rated Heaterplate rated Heatercord L rated Heaterplate Heatercord L Gap Badattachment Contraction Badadhesion Weakbindingforceathinge Fanmotor Door switch Selflocked Wireiscut Badterminalcontact Contact distance Buttonpressure Meltedcontact Contact Poordoor attachment Door liner dimension Contractioninner liner Misalignment Badterminal connection P U l...

Page 38: ...is constrained Insufficient motorRPM Faultyfan Shorud Bent Iceandforeignmaterialsonrotatingparts Fanshroudcontact Clearance Dampingevaporatorcontact Accumulatedresidualfrost Fanmisuse Badshape Looseconnection Nottightlyconnected Insertdepth Ratingmisuse Smallcapacity Lowvaltage Malfunction of charging cylinder Wrongsettingofrefrigerant Insufficientcompressor Faultycompressor Fanoverload Fanmisuse ...

Page 39: ... U 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 Differentrati...

Page 40: ...ition of drain 1 Compressor 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 ...

Page 41: ...nfault Coregap Bad connection Correct screw connection Bad assembly Distortion Foreignmaterialsinside Badconnection Partlydamaged Notconnected Badpipecaulking Normaloperatingsound Vibrationsound Agedrubberseat Badtorqueforassemblingmotor bracket Fanguidecontact Shroudburrcontact Dampingevaporatorcontact Residualfrostcontact Unbalance Iceonthefan Airintake oppositetomotor rubberassembly Supporterdi...

Page 42: ...tor and freezer switch is reversed 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 Transf...

Page 43: ...tweendoorlinerandinnerliner Refrigerator compartmentis openedwhenfreezer compartmentis closed faultystopper High Faultydampercontrol Buttonissetat weak Doorisopen interferenceby food No deodorizer Poorcapacity Seal condition Storespecialodorousfood Longtermstorage Odorsfromchemicalprocucts Biggerdoorfoam Hinge Pintilted Poorflatness Nowasher Nogreaseandnotenough quantity Stopperwornout Badfreezerc...

Page 44: ... 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 it...

Page 45: ...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 46: ... 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 and...

Page 47: ...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 48: ... wire contacts 0Ω Short Ω Cut is cut Tens to thousands Ω Short Sucking duct and discharging hole 1 Confirm foreign materials In case 1 Push out 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 w...

Page 49: ...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 50: ...asket 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 ar...

Page 51: ...artment 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 intermittentl...

Page 52: ... 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 53: ...ion 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 54: ...ain 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 of...

Page 55: ...nyl 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 th...

Page 56: ...rts 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 LCD between Main P...

Page 57: ...nce 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...

Page 58: ...it explanation Foreign materials in Step Check Step Motor damper Remove foreign Motor damper baffles baffle visually materials Ice formation on Check if Step Motor damper Replace Step Motor Step Motor damper Heater wire is cut with a damper or refrigerator baffles tester control Box Assy Defective refrigerator Defective refrigerator Check the resistance of Replace refrigerator Refer to sensor sens...

Page 59: ...explanation 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 tes...

Page 60: ...nser rings or door Defective freezer compartment door Refer to door switch in parts repair Replace Freezer opening alarm switch parts guide compartment door does not work switch Bad water ice Ice and water Defective connecting lead wire from Check 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 ...

Page 61: ...acuum Torr Below 0 03 ref Note Only applicable to the model degree equipped with reverse flow protect plate Vacuum EA High and low Vaccum efficiency can be improved by Pressure sides are operating compressor during evacuation evacuated at the same time for models above 200 L Vacuum EA Use R134a To protect The rubber pipes for R12 refrigerant shall piping exclusive mixing of be melted when they are...

Page 62: ...ile refrigerator operates scales punching off flier Weld carefully after inlet pinching gas welding machine Check leak at weld joints Electronic Leak Detector Minute leak Use electronic leak detector Driver Ruler Big leak Check visually or fingers Note Do not use soapy water for check Check cooling capacity Check radiator manually to see if warm Check hot line pipe manually to see if warm Check fr...

Page 63: ... leak will happen 3 Replacement of drier 1 Be sure to replace drier with R134a only when repairing pipes and injecting refrigerant 4 Nitrogen blowing 1 Weld under nitrogen atmosphere in order to prevent oxidation inside a pipe welding Nitrogen pressure 0 1 0 2 kg cm2 5 Others 1 Nitrogen or refrigerant R134a only should be used when cleaning inside of cycle pipes inside and sealing 2 Check leakage ...

Page 64: ...not necessary because it does not produce oxidized scales inside pipe because of its short welding time 3 Replacement of drier Inserting a capillary tube Measure distance with a ruler and put a mark 12 3 0 on the capillary tube Insert tube to the mark and weld it KEYPOINTING Observe the sequence for removal of refrigerant If not compressor oil may leak KEYPOINTING Welding without nitrogen blowing ...

Page 65: ...easure the weight Calculate the weight of refrigerant charged into the bombe by subtracting the weight of an evacuated bombe KEYPOINTING If power is applied during vacuum degassing vacuum degassing shall be more effective Operate compressor while charging refrigerant It is easier and more certain to do like this KEYPOINTING Be sure to charge the refrigerant at around 25 C Be sure to keep 5g in the...

Page 66: ...ser Drier Evaporator Bombe Rubber 1 Observe the safety precautions for gas handling 2 Use JIG or wet towel in order to prevent electric wires from burning during welding In order to prevent insulation break and accident 3 The inner case shall be melted and insulation material polyurethane shall be burnt if not cared during welding inner case parts 4 The copper pipe shall be oxidized by overheating...

Page 67: ...OINT PIPE ASSY HOT LINE Freezer PIPE ASSY HOT LINE Refrigerator PIPE ASSY JOINT CONDENSER ASSY WIRE PIPE ASSY SUCTION DRIER ASSY CAPI TUBE Copper Brazer Copper Brazer Silver Brazer Copper Brazer Copper Brazer Copper Brazer Coppper Brazer Silver Brazer Copper Brazer ...

Page 68: ... 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 69: ...refrigerator stops the water flowing sound happens This sound happens when the liquid or vapor refrigerant flows from the evaporator to compressor Click sounds Explain the characteriistics of moving parts This noise comes from the MICOM controller s switch on the top of the refrigerator when it is turned on and off ...

Page 70: ...stics 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 o...

Page 71: ...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 72: ...iner 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 73: ...r 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 ASM U in arrow direction A and pull forward in arrow B direction Be careful as the door may be fallen down 4 Lift up the freeze...

Page 74: ...g a cap screw of a grille fan U with a balde screwdriver 2 Disassembly of a grille fan U Pull forward after opening hook at part with a blade screwdriver 3 Disconnect housing A of a grille fan L from the main body 4 Disassembly of a grille fan L Hold upper part of a grille fan L and pull forward carefully 5 Loosen two screws 6 Disassembly of shroud F U Disconnect housing of B after removing two ra...

Page 75: ...Ref No GR A207 FREEZER DOOR PART EXPLODED VIEW 75 202A 200A 201A 203A 206B 206A 501A 205F 205E 205B 205D 205A 205C EV ...

Page 76: ...REFRIGERATOR DOOR PART Optional part EXPLODED VIEW 76 240B 240A 240A 240D 240C 243A 233A 232A 147A 231A 230A 239A 147B 147C 236A 206B 205F 205E 205A 241B 241C 241A 205B 205D 205C EV ...

Page 77: ... part EXPLODED VIEW 77 270A 271B 271A 128E 103A 400A 312A 137B 136D 136A 136B 136C 403A 128D 105B 272A 135B 121A 125A 126A 152A 128C 131C 131E 131B 131D 154A 131J 132A 131H 128A 128D 128F 408A 302B 137A 135A 127A 127A 617A 617A EV ...

Page 78: ... part EXPLODED VIEW 78 160A 161A 270B 271B 271C 103A 116A 151F 115B 401A 150A 272B 151C 151E 146A 626B 626A 626C 624C 624A 115A 151D 140A 140A 140A 165A 167A 401B 150B 165A 166C 166A 166B 166M 166G 166E 402A 152A 162A 162B 177A 177B EV ...

Page 79: ...ENT Optional part EXPLODED VIEW 79 300A 310B 307A 304A 317B 317A 305C 305B 313A 301A 307A 104A 305C 305B 305A 410G 500A 505A 502B 502A 406A 101A 101B 310A 308A 308C 308B 309B 403B 309C 309A 306A 303C 303B 303D 303A EV ...

Page 80: ...P No 3828JD8631M FEB 2005 Printed in Korea ...

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