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LG GR-262, Руководство по обслуживанию

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LG GR-262 Скачать руководство пользователя страница 22

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.)

- 22 -

Содержание GR-262

Страница 1: ...ORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL GR 262 GR 292 REFRIGERATOR SERVICE MANUAL http biz lgservice com Ref No GR 262SQ GR 292SQ Ref No GR 262SQ GR 292SQ Ref No GR 262QVC GR 292QVC ...

Страница 2: ...n 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 t...

Страница 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...

Страница 4: ...ICE L CORD PLATE HEATER SHELF 1 SPECIFICATIONS 4 OPTION ITEMS SPECIFICATIONS FREEZER 61 NET CAPACITY REFRIGERATOR 176 TOTAL 237 DIMENSIONS mm NET WEIGHT kg 49 COOLING SYSTEM Fan Cooling TEMPERATURE FREEZER Knob Shutter CONTROL REFRIERATOR Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE Coated Steel Sheet INNER CASE A B S INSULATION Polyurethane Foam l ITEMS SPECIFICATIONS FR...

Страница 5: ...efrigerator Door Rack Optional Refrigerator Door Rack Leveling Screws Twisting Ice Service Optional or General Type Ice Making Refrigerator Temperature Control Micom Lamp Cover Lower Optional Vegetable Drawer Used to keep fruits and vegetables etc fresh and crisp Deodorizer Optional Shelves Chilled Compartment Freezer Shelf FREEZER COMPARTMENT REFRIGERATOR COMPARTMENT ...

Страница 6: ... Disconnect the lead wire from the switch 3 3 THERMISTOR 1 Remove the Cover Lamp R by the use of 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 fr...

Страница 7: ...ing At the temperature of 72 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 type driver 2 Remove the lamp R by turning 3 7 CON...

Страница 8: ...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 OPENING TYPE 8 ...

Страница 9: ...e the Door Stopper F é for Right Opening Type 11 Move the Pin Position ê of the Hinge Upper 6 Assemble the Hinge Lower 8 Move the Cap and Assemble the Hinge C After removing the washer 10 Move the Cap è and Assemble the Freezer Door 12 Assemble the Hinge Upper and the Cap 9 7 9 8 11 3 13 2 1 3 12 5 4 10 6 ...

Страница 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 According to Starting Method of Motor 4 2 4 Motor Restarting and PTC Cooling 1 For rest...

Страница 11: ...ts Motor 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...

Страница 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...

Страница 13: ...ster 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 22Ω 30 115V 60Hz 6 8Ω 30 240V 50Hz 33Ω 30 127 220V 60Hz 22Ω 30 The resistance value is 0 or serveral hundreds Ω The value is Check another electric components Replace OLP Check another electric components Replace P...

Страница 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...

Страница 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 ...

Страница 16: ...ture 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 Refrigerant...

Страница 17: ...ge 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 Connectin...

Страница 18: ... 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 7 DESCRIPTION OF FUNCTION CIRCUIT OF MICOM 18 Temp Control Medium Medium Low Low Medium High High TEMP C 6 4 5 3 1 1 ROOM REFRIGERATOR ...

Страница 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...

Страница 20: ... the refrigerator temp indication LED on the display of the refrigerator while the remaining LEDs are off 20 R3 R1 R2 NO Error Error Code Display Cause State of Operation with Error R1 R2 R3 Comp Cooling fan Defrostingheater BLINK 1sec on 1sec off OFF NORMAL 1 2 3 Faulty refrigerator R sensor on the control box of the refrigerator Faulty defrosting sensor Defrosting failure Cut or short circuited ...

Страница 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 ...

Страница 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...

Страница 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 ...

Страница 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 ...

Страница 25: ... 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 KΩ 5 0 C Compensation by 56 KΩ 4 0 C raising the 33 KΩ 3 0 C temperature 18 KΩ 2 0 C 12 KΩ 1 0 C 10 KΩ 0 C Standard Temperature 8 2 KΩ 1 0 C Compensation by 5 6 KΩ 2 0 C lowering the ...

Страница 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 ...

Страница 27: ...emperature 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 C 77 KΩ 15 C 60 KΩ 10 C 47 3 KΩ 5 C 38 4 KΩ 0 C 30 KΩ 5 C 24 1 KΩ 10 C 19 5 KΩ 15 C 15 9 KΩ 20 C 13 KΩ 25 C 11 KΩ 30 C 8 9 KΩ 40 C 6 2 KΩ 50 C 4 3 KΩ ...

Страница 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...

Страница 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...

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

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

Страница 32: ...B DISPLAY 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 V...

Страница 33: ...7 5 PWB DIAGRAM 33 ...

Страница 34: ... 34 ...

Страница 35: ...6A 410G 303A 407A 301A 418A 401A 303A 103C 158C 604F 604E 409B 501A 501F 308A 307A 314A 315A 312A 319A 310A 317A 309A 105A 411A 501K 120A The par ts of refrigerator and the shape of each part are subject to change in different localities optional parts 103D ...

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

Страница 37: ... 37 235A 233A 203A 201A 200A 231A 230A 212G 205A 241D 241B 210A 212C 212A 243A 212A 212C ...

Страница 38: ...116B 210A STOPPER DOOR 4620JA2014A 4620JA2014A 212A HANDLE BASE 3650JA1134B 3650JA1134B 212C HANDLE DECO 3650JA1132B 3650JA1132B 212G MARK NAME PLATE 3846JD1008B 3846JD1008B 230A DOOR ASSEMBLY R 3581JM1015A 3581JM1015A 231A DOOR FOAM ASSEMBLY R 5433JM0009B 5433JM0009B 233A GASKET ASSEMBLY R 4987JM1004J 4987JM1004J 235A TRAY EGG 3390JA1148A 3390JA1148A 241B BASKET DOOR 5004JD1117B 5004JD1117B 241D ...

Страница 39: ... 00008B J756 00008B 406B SWITCH PUSH 6600JB1002K 6600JB1002K 407A HEATER PLATE 5300JB1075A 5300JB1075A 409B LAMP VACUUM 6912JB2002F 6912JB2002F 411A POWER CORD ASSEMBLY 6411JN2003F 6411JN2003F 418A HEATER CORD L 5300JB1078A 5300JB1078A 501A PWB PCB ASSEMBLY MAIN 6871JB1103G 6871JB1103G 501F COVER PWB 3550JA2146A 3550JA2146A 501K CASE PWB 3110JA1036A 3110JA1036A OPTIONAL PARTS 103C COVER LOWER 3550...

Страница 40: ...D1116B 210A STOPPER DOOR 4620JA2014A 4620JA2014A 212A HANDLE BASE 3650JA1134B 3650JA1134B 212C HANDLE DECO 3650JA1132B 3650JA1132B 212G MARK NAME PLATE 3846JD1008B 3846JD1008B 230A DOOR ASSEMBLY R 3581JM1024A 3581JM1024F 231A DOOR FOAM ASSEMBLY R 5433JM0020B 5433JM0020B 233A GASKET ASSEMBLY R 4987JM1004P 4987JM1004P 235A TRAY EGG 3390JA1148A 3390JA1148A 241B BASKET DOOR 5004JD1117B 5004JD1117B 241...

Страница 41: ...J756 00008B J756 00008B 406B SWITCH PUSH 6600JB1002K 6600JB1002K 407A HEATER PLATE 5300JB1075A 5300JB1075A 409B LAMP VACUUM 6912JB2002E 6912JB2002E 411A POWER CORD ASSEMBLY 6411JN2003F 6411JN2003F 418A HEATER CORD L 5300JB1078A 5300JB1078A 501A PWB PCB ASSEMBLY MAIN 6871JB1103G 6871JB1103G 501F COVER PWB 3550JA2146A 3550JA2146A 501K CASE PWB 3110JA1036A 3110JA1036A OPTIONAL PARTS 103C COVER LOWER ...

Страница 42: ...P No 3828JD8330A JAN 2002 Printed in Korea ...

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