LG GR-S462 Service Manual
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LG GR-S462 Service Manual

Refrigerator
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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-S462/GR-S512
http://biz.lgservice.com

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Summary of Contents for LG GR-S462

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. MODEL: GR-S462/GR-S512...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 DISASSEMBLY..................................6-7 DOOR....................................6 DOOR SWITCH..................................6 THERMISTOR ..................................6 FAN AND FAN MOTOR................................ 6 DEF' CONTROL ASM ................................7 LAMP....................................7 CONTROL BOX-R................................7 ADJUSTMENT..................................8-9 COMPRESSOR..................................

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R- 134a to the refrigerant system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R-134a with a tolerance of refilling operation.

  • Page 4: Specifications

    1. SPECIFICATIONS SPECIFICATIONS ITEMS GR-S512Q/GR-S512G GR-S462Q/GR-S462G FREEZER NET CAPACITY REFRIGERATOR ( l ) TOTAL DIMENSIONS (mm) 680(W) 758(D) 1725(H) 680(W) 708(D) 1725(H) NET WEIGHT (kg) COOLING SYSTEM Fan Cooling FREEZER Knob Dial TEMPERATURE CONTROL REFRIGERATOR Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE Coated Steel Sheet...

  • Page 5: Parts Identification

    2. PARTS IDENTIFICATION FREEZER COMPARTMENT Lamp Freezer Temperature Control Dial Freezer Door Rack Freezer Shelf Twisting Ice Serve(Option) Egg Storage Rack General Type Ice Making REFRIGERATOR Wine Rack COMPARTMENT (Option if steel shelf) Deodorizer You can use (Option) this as Vodka rack Chilled Compartment in the Freezer.

  • Page 6: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH 1. To remove the door switch, pull out it with a '—' type Freezer Door 1. Remove the hinge cover by pulling it upwards. driver as shown in (figure 9). 2. Loosen hexagonal bolts fixing the upper hinge to the 2.

  • Page 7: Def' Control Asm

    6. Disconnect the housing of lead wire. 3-6 LAMP 7. Separate the Fan Assy. 8. Loose 2 screw fixed to the Bracket. FREEZER ROOM LAMP REFRIGERATOR ROOM LAMP 9. Pull out Shroud-F remove the Fan Motor Assy. 10. Separate the Motor Bracket and Rubber. FAN MOTOR SHROUD Figure 16...

  • Page 8: Adjustment

    4. ADJUSTMENT 4-1 COMPRESSOR 4-2-3 PTC-Applied Circuit Diagram According to Starting Method of Motor 4-1-1 Role The compressor inhales low temperature and low pressure gas evaporated from Evaporator of the Refrigerator, and OVERLOAD PROTECTOR condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

  • Page 9: Olp (Over Load Protector)

    4-3 OLP (OVER LOAD PROTECTOR) CONTACTING 4-3-1 Definition of OLP POINT COVER (1) OLP (OVER LOAD PROTECTOR) is attached to Hermetic Compressor and protects Motor by cutting off BIMETAL current in Compressor Motor by Bimetal in the OLP in case of over-rising temperature. (2) When over-voltage flows to Compressor motor, Bimetal CONTACTING POINT...

  • Page 10: Troubleshooting

    6. TROUBLESHOOTING 6-1 COMPRESSOR AND ELECTRIC COMPONENTS (Rating Voltage Remove the PTC-Starter Power Source. ±10%)? from the Compressor and measure the voltage between Terminal C of Compressor and Terminals 5 or 6 of PTC. No Voltage. OLP disconnected? Replace OLP. Check connection condition.

  • Page 11: Ptc And Olp

    6-2 PTC AND OLP Check another Normal operation of Observation value is Separate the PTC from electric components. Compressor is 220V/50Hz : 22 ±30% Compressor and impossible or poor. 115V/60Hz : 6.8 ±30% measure the resistance 240V/50Hz : 33 ±30% between No.

  • Page 12: Another Electric Components

    6-3 ANOTHER ELECTRIC COMPONENTS Cooling is impossible Compressor Check if current flows to Cause. doesn't run. the following components. a. Thermistor Poor contacting. b. Starting devices Shorted or broken. Poor contacting c. OLP or shorted. d. Compressor coil Coil shorted. Replace Poor contacting e.

  • Page 13: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Cooling is • Is the power cord unplugged from the outlet? • Plug to the outlet. impossible. • Check if the power S/W is set to OFF. • Set the switch to ON. •...

  • Page 14: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer and Low flowing sound of A little high • A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and more than •...

  • Page 15: Refrigerating Cycle

    General Control of Refrigerating Cycle ITEMS CONTENTS AND SPECIFICATIONS REMARKS WELDING (1) H 30 • Chemical Ingredients • Recommend H34 containing 34% Ag in the (1) • Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% • Service Center. • Brazing Temperature: 710~840°C (2) Bcup-2 •...

  • Page 16: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GR-S462/GR-S512. For the other models, refer to the diagram of the entire PCB circuit. 7-1 FUNCTION 7-1-1 FUNCTION 1. When the appliance is plugged in, it is set to ‘Medium’. Each time the button is pushed, it is set to ‘Medium’...
  • Page 17 7-1-2 DEFROSTING 1. The defrosting is performed each time when the total running time of the compressor reaches 7 hours. 2. After the power is turned on (or restored after a power failure), the defrosting starts when the total running time of the compressor reaches 4 hours.
  • Page 18 7-1-5 ERROR DIAGNOSTIC MODE 1. The error diagnostic mode allows the SVC when a fault that may affect the performance of the product occurs while operating the product. 2. Even if the function control button is pushed when an error occurs, the function will not be performed. 3.

  • Page 19: Pcb Function

    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. PART VA 1 CE 2...
  • Page 20 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.
  • Page 21 7-2-4 LOAD DRIVE CIRCUIT 1. Load Drive Condition Check Comp, Load Type Defrosting Heater Refrigerator Fan Freezer Fan Motor Measurement Location(IC5) No.13 No.10 No.12 1V or below Condition - 21 -...
  • Page 22 7-2-5 TEMPERATURE SENSOR CIRCUIT The upper CIRCUIT reads REFRIGERATOR temperature and DEF-SENSOR temperature for defrosting into MICOM. OPENING or SHORT state of each TEMPERATURE SENSOR are as follows. SENSOR CHECK POINT NORMAL(-30 °C ~ 50 °C) SHORT-CIRCUITED OPEN Refrigerator Sensor POINT Voltage 0.5 V ~ 4.5 V...
  • Page 23 7-2-7 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT 1. Refrigerator Temperature Compensation Refrigerator Resistance Temperature Remark (RCR1) Compensation 180 K +2.5 °C Compensation by raising the 56 K +2.0 °C temperature 33 K +1.5°C 18 K +1.0 °C 12 K +0.5 °C 10 K 0 °C Standard Temperature...
  • Page 24 7-2-8 KEY BUTTON INPUT & 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. - 24 -...

  • Page 25: Resistance Specification Of Sensor

    7-3 RESISTANCE SPECIFICATION OF SENSOR TEMPERATURE SENSOR RESISTANCE OF REFRIGERATOR (DEFROST) SENSOR - 20 ˚C 77 K - 15 ˚C 60 K - 10 ˚C 47.3 K - 5 ˚C 38.4 K 0 ˚C 30 K + 5 ˚C 24.1 K + 10 ˚C 19.5 K + 15 ˚C...
  • Page 26 7-4 TROUBLE SHOOTING • Replace PCB when no trouble after checking the contents of trouble. CLASSIFICATION STATE OF TROUBLE POINT BE CHECKED CHECKING METHOD CONTENT REMEDY POWER SOURCE 1. All the DISPLAY 1. FREEZER/ FREEZER/REFRIGERATOR POWER SOURCE is poor Certify Fuse. is poor LED OFF REFRIGERATOR...
  • Page 27 CLASSIFICATION STATE OF TROUBLE POINT BE CHECKED CHECKING METHOD CONTENT REMEDY COOLING is poor. REFRIGERATOR 1. FREEZER TEMPERATURE See "FREEZER Certify the attaching state TEMPERATURE is is normal? TEMPERATURE is poor". of DOOR. poor. 2. Cool air of FAN MOTOR is Certify the amount of cool air FAN MOTOR is poor.
  • Page 28 7-5 MAIN PWB ASSEMBLY AND PARTS LIST 7-5-1 MAIN PWB ASSEMBLY - 28 -...
  • Page 29 7-5-2 REPLACEMENT PARTS LIST - 29 -...
  • Page 30 7-5-3 PWB ASSEMBLY, DISPLAY AND PARTS LIST - 30 -...
  • Page 31 7-6 PWB DIAGRAM - 31 -...
  • Page 32 REF. TEMP. CONTROL - 32 -...

  • Page 33: Exploded View

    8. EXPLODED VIEW The parts of refrigerator and the shape of each part are subject to change in different localities. Capacitors and fuse are optional parts. : Optional parts. 1) Freezer Shelf -Plastic : 149A -Steel : 136C, 136D 103B 2) Ice Maker 301A - Twist : 110B, 125A, 125H, 131A...
  • Page 34 405C 405A 330B 404A 329A 332A 149D 110B 125A 131A 136C 125H 125J 149A 136D 149B 140A 149C 149C 136A 136B 149C 149C 136A 136B 154A 155B 151A - 34 -...
  • Page 35 205A 200A 203A 201A 201A 205A 212G 212G 212A 212C 212A 212C 235A 210A 210A 241A 230A 233A 231A 237A 233B 231A 233B 241C 244A 244C 241A 244A 244C 241D 210A 210A - 35 -...

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