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LG GR-562, Service Manual

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LG GR-562 Service Manual Download Page 23

7-2 PCB FUNCTION

7-2-1 POWER CIRCUIT

The secondary part of the TRANS is composed of the power supply for the display and relay drive (12Vdc) and that for the
MICOM and IC (5Vdc).

The voltage for each part is as follows.

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.

- 23 -

PART

VA 1

CE 2

CE3

VOLTAGE

220 Vac

12 Vdc

5 Vdc

Summary of Contents for GR-562

Page 1: ...ON BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL REFRIGERATOR SERVICE MANUAL http biz lgservice com GR R602JQA MODEL GR R491JCA Ref No GR R602JTQA GR R491JTA COLOR SUPER WHITE TITANIUM ...

Page 2: ... 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 the lower part with the upper do...

Page 3: ...operation 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...

Page 4: ... TEMPERATURE CONTROL Micom Control Micom Control Full Automatic Heater Defrost OUT CASE Pre Coated Metal INNER CASE A B S INSULATION Polyurethane Foam FREEZER 1 EA REFRIGERATOR 2 EA VEGETABLE TRAY Drawer Type EGG TRAY 1 Pieces ICE TRAY 1 Piece 2 ICE BANK 1 Piece COMPRESSOR P T C Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 135g DEFROSTING DEVICE Heater l SHELF ...

Page 5: ...ONTROL Knob Dial Knob Dial Full Automatic Heater Defrost OUT CASE Coated Steel Sheet INNER CASE A B S INSULATION Polyurethane Foam FREEZER 1 EA REFRIGERATOR 2 EA VEGETABLE TRAY Drawer Type EGG TRAY 2 Pieces ICE TRAY 1 Piece 2 ICE BANK 1 Piece COMPRESSOR P T C Starting Type EVAPORATOR Fin Tube Type CONDENSER Wire Condenser REFRIGERANT R134a 135g DEFROSTING DEVICE Heater l SHELF DEFROSTING SYSTEM ...

Page 6: ...NTIFICATION FREEZER COMPARTMENT Lamp Shelf Deodorizer Optional Vitamin Vegetable Drawer Optional Shelves Lamp Fresh Zone Optional REFRIGERATOR COMPARTMENT Twisting Ice Serve Optional or General Type Ice Making Optional Egg Storage Rack Dairy Conner Refrigerator Door Rack Freezer Door Rack Leveling Screw Vegetable Drawer Base Cover Freezer Temperature Control Dial ...

Page 7: ...u u GR S562 S602 7 NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above ...

Page 8: ...sting Ice Serve Optional or Refrigerator Temperature Control Dial Egg Storage Rack Refrigerator Door Rack Freezer Door Rack Leveling Screw Base Cover Freezer Temperature Control Dial General Type Ice Making Optional NOTE This guide covers several different models The refrigerator you have purchased may have some or all of the features shown above ...

Page 9: ...ll out it with a type driver as shown in figure 9 2 Disconnect the lead wire from the switch 3 3 FAN AND FAN MOTOR 1 Remove the freezer shelf 2 Remove the Cover Lamp F and Case Lamp by loosening 1 screw fixed to ceiling of Inner Case 3 Remove the Grille by pulling it out 4 Pull out the Shroud and remove the Fan Motor Assy by loosening 2 screws 5 Pull out the fan and separate the Fan Motor Brackets...

Page 10: ...after inserting finger into the inside hole as shown in figure 16 3 Remove the lamp by turning it counterclockwise 4 Assemble in reverse order of disassembly Replacement bulb must be the same specication as original 3 5 2 Refrigerator room lamp 1 Unplug the power cord from the outlet 2 Remove refrigerator shelves 3 Remove the room lamp lid by taking down while pulling forward with your hands as sh...

Page 11: ...tor 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 resta...

Page 12: ...tor 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 u u GR R562 R602 5 CIRCUIT DIAGRAM CONTACTING POINT COVER BIMETAL C...

Page 13: ...u u GR S562 S602 u u GR 562 602 NOTE 1 This is a basic diagram and specifications vary in different localities 13 ...

Page 14: ...dvise 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 re...

Page 15: ...istone Bridge Figure 22 Separate the OLP from Compressor and check resistance value between two terminals of OLP with a Tester Figure 23 Observation value is 220V 50Hz 47Ω 30 220 240V 50Hz 47Ω 30 110 115V 60Hz 6 8Ω 30 220V 60Hz 47Ω 30 127V 60Hz 22Ω 30 The resistance value is 0 or several hundreds Ω The value is Check another electric components Replace OLP Check another electric components Replace...

Page 16: ...ressor 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 ...

Page 17: ...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 18: ...re Normal cooling is possible don t get cold formed when injecting Refrigerant at all 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 and Flowing sound of Refrigerant Equal to...

Page 19: ...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...

Page 20: ...ABLE SPEED FAN IN THE FREEZER COMPARTMENT 1 Fan motor in the freezer compartment shall change from standard to high speed rpm in order to increase cooling speed and load corresponding speed 2 High speed rpm is only used for the initial power application and load corresponding operation But standard rpm is used in the general working condition 3 When the door of freezer room or refrigerator room is...

Page 21: ... circuited wire the defrosting will not be performed 7 1 4 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 22: ...he refrigerator temp indication LED on the display of the refrigerator while the remaining LEDs are off 22 GR R562 R602 GR S562 S602 R1 R2 R3 R4 NO Error Error Code Display Cause State of Operation with Error R1 R2 R3 R4 Comp Coolingfan Defrosting heater ON OFF 1 2 3 Faulty refrigerator R sensor on the control box of the refrigerator Faultydefrostingsensor Defrosting failure Cut or short circuited...

Page 23: ...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 23 PART VA 1 CE 2 CE3 VOLTAGE 220 Vac 12 Vdc 5 Vdc ...

Page 24: ... 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 25: ...UIT 1 Load Drive Condition Check 25 R21 4 7K Load Type Measurement Location IC5 No 16 No 13 No 15 No 14 No 11 ON 1V or below Condition OFF 12V Comp Defrosting Heater Freezer Fan Motor High RPM Standard RPM Lamp Compensation ...

Page 26: ... MICOM OPENING or SHORT state of each TEMPERATURE SENSOR are as follows 7 2 6 DOOR OPEN DETECTION CIRCUIT 26 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 Closed 0V Open 5V Measurement Location Freezer Refrigerator Door Pin No 13 ...

Page 27: ...compensation resistance RCR1 is changed from 10K the current resistance to 18K the adjustment resistance the temperature of the refrigerator rises 1 0 C Refrigerator Resistance Temperature Remark RCR1 Compensation 180 KΩ 2 5 C Compensation by 56 KΩ 2 0 C raising the 33 KΩ 1 5 C temperature 18 KΩ 1 0 C 12 KΩ 0 5 C 10 KΩ 0 C Standard Temperature 8 2 KΩ 0 5 C Compensation by 5 6 KΩ 1 0 C lowering the...

Page 28: ... 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 28 ...

Page 29: ...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 ...

Page 30: ...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 31: ...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 RY4 of MAIN PWB 2 DRAIN PIPE blocking Certify DRAIN PIPE DRAIN PIPE blocking Remov...

Page 32: ...7 5 MAIN PWB ASS Y AND PARTS LIST 7 5 1 MAIN PWB ASS Y 32 u u GR R562 R602 ...

Page 33: ...7 5 2 MAIN PWB ASS Y 33 u u GR S562 S602 ...

Page 34: ...7 5 3 REPLACEMENT PARTS LIST u u GR R562 R602 34 ...

Page 35: ...7 5 4 REPLACEMENT PARTS LIST u u GR S562 S602 35 ...

Page 36: ...7 5 5 PWB ASS Y DISPLAY AND PARTS LIST u u GR R562 R602 36 ...

Page 37: ...7 5 6 PWB ASS Y DISPLAY AND PARTS LIST u u GR S562 S602 37 ...

Page 38: ...7 6 1 PWB DIAGRAM u u GR R562 R602 38 ...

Page 39: ... 39 ...

Page 40: ...7 6 2 PWB DIAGRAM u u GR S562 S602 40 ...

Page 41: ... 41 ...

Page 42: ...14A 307A 312A 317A 310A 120A 327A 129A 158A 158B 409A 604G 319C 604E 328B 401A 309A 308A 282J 158C 103B 103A 158F 158E 408B 409B 410G 410H 501A 501F 411A 501K 105A 301A 418A 407A 8 1 The parts of refrigerator and the shape of each part are subject to change in different localities Capacitors and fuse are optional parts u u GR R562 602 GR S562 602 EV ...

Page 43: ...5A 125A 131A 125A 125H 149A 149B 330B 332A 152B 152A 151A 151A 233B 235A 405C 404A 405C 405A 329A 210A 210B 212G 212C 212A 243A 243B 244A 244C 203A 200A 201A 201A 201A 201A 212G 212C 212A 243A 243B 244C 244A 233A 230A 231A 231A 231A 231A 241C 131A 212G 210A 210B 503B 503C 212A 212C 243A 243B 244A 244C 243A 243B 212A 212G 212A 210A 210B 503B 503C EV ...

Page 44: ... 283B 282B 103C 281B 281A 323B 328A 329C 420A 319A 315B 315B 315C 318A 314A 307A 312A 317A 310A 327A 129A 158A 158B 409A 604G 319C 604E 328B 401A 309A 308A 282J 103B 103A 105A 301A 418A 407A 411A 410G 410B 410A 410C 410H 158C 409B 410J 120A 110A EV ...

Page 45: ... 131C 212G 212C 212A 205A 205A 241D 241A 241D 241A 151A 151A 155K 154A 149C 149C 140A 125C 136N 136P 140B 136Q 136R 149A 136A 136B 149B 125A 125A 131A 125A 125H 149A 149B 330B 332A 151A 405C 404A 405C 405A 329A 243A 243B 244A 244C 243A 243B 210A 210B 212G 212A 212C 244A 244C EV ...

Page 46: ...P No 3828JD8858X JUN 2005 Printed in Korea ...

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