LG GN-U262 Service Manual Download | Manualshive

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CAUTION

BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.

MODEL: GN-U262

/292

S

REFRIGERATOR

SERVICE MANUAL

http://biz.lgservice.com

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Summary of Contents for GN-U262

Page 1: ...CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL GN U262 292S REFRIGERATOR SERVICE MANUAL http biz lgservice com ...

Page 2: ... in the set 2 To prevent electric shock unplug prior to servicing 3 In case of testing with power on wear rubber gloves to prevent electric shock 4 If you use any appliances check regular current voltage and capacity 5 Don t touch metal products in cold freezer with wet hand It may cause frostbite 6 Prevent water flowing to electric elements in mechanical parts 7 When you stand up during observing...

Page 3: ...ration is over add the quantity in grams of 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 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 th...

Page 4: ... OPTION ITEMS SPECIFICATIONS FREEZER 1 EA REFRIGERATOR 2 EA VEGETABLE TRAY Drawer Type EGG TRAY 1 Piece ICE TRAY 1 Piece 2 ICE BANK 1 Piece COMPRESSOR P T C Starting Type EVAPORATOR Fin Tube Type CONDENSER Pipe On Sheet Type REFRIGERANT R134a 120g LUBRICATING OIL FREOL á 22G 210cc DEFROSTING DEVICE L CORD PLATE HEATER SHELF OPTION GR 262S V Q 540 W x 610 D x 1530 H GN 262S V C K GN U262RL V C K mm...

Page 5: ...ent Refrigerator Temperature Electronic Control Lamp Deodorizer Optional Vegetable Drawer Used to keep fruits and vegetables etc fresh and crisp Vitamin Kit Optional Freezer Door Rack Egg Storage Rack GR 292 only Refrigerator Door Rack Leveling Screws Cap Cover Optional Upper Hinge Cap Hinge Optional NOTE This is a basic model The shape of refrigerator is subject to change ...

Page 6: ... the switch 3 3 THERMISTOR 1 Remove the Cover Lamp R by the use of ÐÐÐ type driver inserting in the low holes of the cover 2 Loose 2 screw 3 Pull the Control Box R 4 Disconnect the Housing of lead wire 5 Separate the INSU Multi Duct and Control Box R 6 Separate the Thermistor and Control Box R 7 Separate the Thermistor and Display PCB 3 4 FAN AND FAN MOTOR 1 Remove the freezer shelf 2 Separate the...

Page 7: ... At the temperature of 72 o 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 6 REFRIGERATOR ROOM LAMP 1 Remove the cover lamp R by pulling with a ÐÐÐ type driver 2 Remove the lamp R by turning 3 7 ...

Page 8: ...assembling the Hinge Lower and the Adjustable Screw Asm Don t lay the refrigerator down in working with it it will cause to get out of order 4 Be careful not to drop the door in disassembling or assembling the freezer or the refrigerator door 5 This refrigerator according to the install position or user s liking can be used as the type of opening from the right or the left HOW TO REPLACE THE DOOR ...

Page 9: ...osite side and assemble the center hinge perpendicularly 9 Assemble the door stopper for the 10 Move the Cap Cover to the opposite side of the freezer door 11 12 Reverse the pin position of the upper hinge Assemble the screw to the top table until it is strong enough to support the freezer door Torque value is 5 7 kgf Assemble the door stopper for the correct side of the freezer door ...

Page 10: ...otor 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 4 2 3 PTC Applied Circuit Diagram 펰According to Starting Method of Motor 4 2 4 Motor Restarting and PTC Cooling 1 For res...

Page 11: ...or by cutting off current which flows to Compressor Motor 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 Composition and connection Diagram of OLP 5 CIRCUIT DIAGRAM 11 CONTACTING POINT COVER BIMETAL CONTACTING POINT...

Page 12: ...ise the customer to use a regular Trans Replace Compressor OLP works within 30 sec in forcible OLP operation by turning instant power on and off Components start in the voltage of Rating Voltage 10 below Applied voltage isn t in the range of Rating Voltage 10 Check the resistance among M C S C and M S in Motor Compressor Check the resistance of two terminals in PTC Starter Check if applying a regu...

Page 13: ... Tester or Whistone Bridge Figure 37 Separate the OLP from the Compressor and check the resistance value between two terminals of OLP with a Tester Figure 38 Observation value is 220V 50Hz 22 30 115V 60Hz 6 8 30 240V 50Hz 33 30 127 220V 60Hz 22 30 The resistance value is 0 or serveral hundreds The value is Check another electric components Replace OLP Check another electric components Replace PTC ...

Page 14: ...sor Replace the compressor Replace each component Raise the voltage Replace each component Cause Check if current flows to starting devices Check current flowing in sub coil of Compressor Check capacity of OLP The items described above are normal Cooling ability is poor Fan motor doesn t run Much frost are sticked to the EVAPORATOR Poor contacting Coil is shorted Shorted Replace each component Rep...

Page 15: ...ten or check if the door is closed up it firmly Dew forms Check if ambient temperature and humidity Wipe dew with a dry cloth This happening in the Out Case of surroumcling air are high is solved in low temperature and humidity naturally Is the gap in the door packed Fill up the gap Abnormal Is the set positioned in a firm and even place Adjust the Adjust Screw and position noise generates in the ...

Page 16: ...rature Normal cooling is possible don t get cold formed when injecting Refrigerant normally of regular amount PARTIAL Freeze room and Flowing sound of Refrigerant A little high Normal discharging of CLOG Refrigerator is heard and frost forms more than refrigerant don t get cold in inlet only ambient The capillary tube is faulty normally temperature WHOLE Freezer room and Flowing sound of Refrigera...

Page 17: ...e without fail 1 gauge of charging M C vacuum Perform vacuum operation until a proper 1 degree is within 1 Torr vacuum degree is built up 2 If the vacuum degree of the cycle inside is If a proper vacuum degree isn t built up 2 10 Torr below for low pressure and 20 Torr check the leakage from 2 for high pressure it says no vacuum the Cycle Pipe line part and 2 leakage state Quick Coupler Connecting...

Page 18: ...appliance is plugged in it is set to Medium Each time the button is pushed it is set to Medium Õ Medium High Õ High Õ Low Õ Medium Low Õ Medium in order 2 When the power is initially applied or restored after a power failure it is automatically set to Medium 7 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 18 Temp Control Low Low Medium High High TEMP ºC ROOM Medium Medium 6 4 5 3 1 1 REFRIGERATOR ...

Page 19: ... circuited wire the defrosting will not be performed 7 1 3 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 Seq...

Page 20: ...mp indication LED on the display of the refrigerator while the remaining LEDs are off 20 Error Code Display Cause State of Operation with Error R1 R2 R3 Comp Cooling fan Defrosting heater ON OFF 1 2 3 Faulty refrigerator R sensor on the control box of the refrigerator Faulty defrosting sensor Defrosting failure Cut or short circuited wire of refrigerator sensor Cut or short circuited wire of defro...

Page 21: ...MICOM and IC 5Vdc The voltage for each part is as follows 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 21 PART VA 1 CE 2 CE3 VOLTAGE 220 Vac 12 Vdc 5 Vdc ...

Page 22: ... 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 n...

Page 23: ...7 2 4 LOAD DRIVE CIRCUIT 1 Load Drive Condition Check 23 Load Type Defrosting Heater Measurement Location A B ON 1V or below Condition OFF 12V Comp Freezer Fan Motor ...

Page 24: ...erature and DEF SENSOR temperature for defrosting into MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 24 SENSOR CHECK POINT NORMAL 30 C 50 C SHORT CIRCUITED OPEN Refrigerator Sensor POINT Voltage 0 5 V 4 5 V 0 V 5 V Defrosting Sensor POINT Voltage A B ...

Page 25: ...erator compensation resistance RCR1 is changed from 10K the current resistance to 18K the adjustment resistance the temperature of the refrigerator rises 2 C Refrigerator Resistance Temperature Remark RCR1 Compensation 180 K 5 0 C Compensation by 56 K 4 0 C raising the 33 K 3 0 C temperature 18 K 2 0 C 12 K 1 0 C 10 K 0 C Standard Temperature 8 2 K 1 0 C Compensation by 5 6 K 2 0 C lowering the 3 ...

Page 26: ... 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 26 ...

Page 27: ...ture 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 TEMPERATURE SENSOR RESISTANCE OF REFRIGERATOR DEFROST SENSOR 20 ºC 77 K 15 û C 60 K 10 û C 47 3 K 5 û C 38 4 K 0 û C 30 K 5 û C 24 1 K 10 û C 19 5 K 15 û C 15 9 K 20 û C 13 K 25 û C 11 K 30 û C 8 9 K 40 û C 6 2 K 50 û C 4 3 K ...

Page 28: ...OMPRESSOR lock or Replace COMPRESSOR blocked OLP PTC is poor Replace OLP PTC COMPRESSOR RELAY is Replace MAIN PWB RY1 poor THE CONNECTING WIRE Certify the black wire of MAIN is poor PWB CONNECTOR CON1 2 Whether refrigerant leaks or Measure the amount of frost Refrigerant leakage Remedy the leaking part leaks or not sticking on EVA and the and reaching Refrigerant surface temperature of condenser p...

Page 29: ...G is poor DEFROSTING is NO DEFROSTING 1 HEATER emit heat Check the MAIN PCB HEATER disconnection Replace HEATER poor TEMPERATURE FUSE Replace TEMPERATURE disconnection FUSE Connection is poor Certify EVA connection and wire of MAIN PWB CONNECTOR CON1 DEF SENSOR is poor Replace DEF SENSOR HEATER RELAY is poor Replace RY2 of MAIN PWB 2 DRAIN PIPE blocking Certify DRAIN PIPE DRAIN PIPE blocking Remov...

Page 30: ...7 4 MAIN PWB ASS Y AND PARTS LIST 7 4 1 MAIN PWB ASS Y 30 1 R B52DZ R B55DZ ...

Page 31: ...7 4 2 REPLACEMENT PARTS LIST 31 ...

Page 32: ...AY SWITCH LED DIODE SWITCHING LEAD WIRE LEAD WIRE LEAD WIRE LEAD WIRE LEAD WIRE HOUSING TAP DOUBLE LOCK PLATE HOUSING CONTACT TAPE VINYL SENSOR TEMPERATURE SOLDER SOLDERING SOLDER LEAD BAR FLUX Spec R B29 HM PJT KPT 1105A SV50 R032BF569GG 1N4148 26MM UL1007 AWG24 VSF 0 18 12 0 3MM2 UL1007 AWG24 VSF 0 18 12 0 3MM2 UL1007 AWG24 VSF 0 18 12 0 3MM2 UL1007 AWG24 VSF 0 18 12 0 3MM2 UL1007 AWG24 VSF 0 18...

Page 33: ...7 5 PWB DIAGRAM 33 ...

Page 34: ... 34 ...

Page 35: ...e of each part are subject to change in different localities optional parts 501K 314A 318A 105A 317A 310A 308A 309A 411A 307A 312A 327A 319A 410G 501A 501F 125L 282B 406B 120A 418A 401A 301A 281A 281B 103A 103B 158C 409B 283B 106B 407A 106A 315A 604E 604F ...

Page 36: ... optional parts 405C 405A 404A 329A 330B 332A 151A 154A 149B 140A 149A 131A 125A 110B 149C ...

Page 37: ...109B 109B 201A 200A 203A 235A 231A 205A 241D 233A 230A 109C 210A 281D optional parts 243A 241B ...

Page 38: ......

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