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LG GR-R491JCA Service Manual
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LG GR-R491JCA Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
Ref. No.
GR-R602JQA
GR-R602JTQA
MODEL: GR-R491JCA
GR-R491JTA
http://biz.lgservice.com
COLOR: SUPER WHITE
TITANIUM

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Summary of Contents for LG GR-R491JCA

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL. Ref. No. GR-R602JQA GR-R602JTQA MODEL: GR-R491JCA COLOR: SUPER WHITE GR-R491JTA TITANIUM...

  • Page 2: Table Of Contents

    CONTENTS CONTENTS..................................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS ................................4-5 PARTS IDENTIFICATION ............................... 6 DISASSEMBLY.................................. 9-10 DOOR....................................9 DOOR SWITCH..................................9 FAN AND FAN MOTOR................................ 9 DEF' CONTROL ASM ................................ 10 LAMP....................................10 CONTROL BOX-R................................10 ADJUSTMENT ................................. 11-13 COMPRESSOR .................................. 11 PTC-STARTER ...................................

  • 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-R562/GR-S562 GR-R602/GR-S602 FREEZER NET CAPACITY REFRIGERATOR ( l ) TOTAL DIMENSIONS (mm) 755(W) 699(D) 1777(H) 755(W) 729(D) 1777(H) NET WEIGHT (kg) TEMPERATURE CONTROL Micom Control Micom Control Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE Pre Coated Metal INNER CASE A B S INSULATION...
  • Page 5 SPECIFICATIONS ITEMS GR-562 GR-602 FREEZER NET CAPACITY REFRIGERATOR ( l ) TOTAL DIMENSIONS (mm) 755(W) 699(D) 1777(H) 755(W) 729(D) 1777(H) NET WEIGHT (kg) TEMPERATURE CONTROL Knob Dial Knob Dial Full Automatic DEFROSTING SYSTEM Heater Defrost OUT CASE Coated Steel Sheet INNER CASE A B S INSULATION...

  • Page 6: Parts Identification

    2. PARTS IDENTIFICATION u u GR-R562/R602 FREEZER COMPARTMENT Lamp Shelf Freezer Temperature Control Dial Twisting Ice Serve (Optional) Freezer Door Rack General Type Ice Making (Optional) REFRIGERATOR Egg Storage Rack COMPARTMENT Deodorizer Dairy Conner (Optional) Fresh Zone (Optional) Lamp Shelves Refrigerator Door Rack Vitamin Vegetable...
  • Page 7 u u GR-S562/S602 NOTE: This guide covers several different models.The refrigerator you have purchased may have some or all of the features shown above. - 7 -...
  • Page 8 u u GR-562/602 FREEZER COMPARTMENT Lamp Shelf Freezer Temperature Control Dial Twisting Ice Serve(Optional) Freezer Door Rack General Type Ice Making (Optional) REFRIGERATOR COMPARTMENT Egg Storage Rack Deodorizer (Optional) Refrigerator Temperature Control Dial Fresh Zone (Optional) Lamp Refrigerator Shelves Door Rack Vegetable Drawer Leveling Screw Base Cover...

  • Page 9: Disassembly

    3. DISASSEMBLY 3-1 DOOR 3-2 DOOR SWITCH Freezer Door 1. To remove the door switch, pull out it with a '—' type 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 10: Def' Control Asm

    3-4 DEF' CONTROL ASSY 3-5-1 Freezer room lamp 1. Unplug the power cord from the outlet. Def control ASM consists of Defrost Sensor and FUSE–M. 2. Remove the room lamp lid by taking down while pulling Defrost Sensor functions to defrost automatically and it is it forward with your hand after inserting finger into the attached to the Evaporator and the metal side of the case inside hole as shown in (figure 16).

  • Page 11: 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 12: 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 13 GR-S562/S602 GR-562/602 NOTE : 1. This is a basic diagram and specifications vary in different localities. - 13 -...

  • Page 14: 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 15: Ptc And Olp

    6-2 PTC AND OLP Check another Normal operation of Separate the PTC from Observation value is electric components. Compressor is 220V/50Hz : 47 ± 30% Compressor and impossible or poor. 220 - 240V/50Hz : 47 ± 30% measure the resistance 110 -115V/60Hz : 6.8 ±...

  • Page 16: Another Electric Component

    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 17: 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 18: 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 19 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 20: Description Of Function & Circuit Of Micom

    7. DESCRIPTION OF FUNCTION & CIRCUIT OF MICOM The following description is basically for GR-R562/GR-R602, GR-S562/GR-S602, GR-562/GR-602, 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 21 7-1-3 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 22 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 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. PART VA 1 CE 2...
  • Page 24 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 25 7-2-4 LOAD DRIVE CIRCUIT 1. Load Drive Condition Check 4.7K Freezer Fan Motor Lamp Defrosting Load Type Comp Compensation Heater High RPM Standard RPM Measurement Location (IC5) No. 16 No. 13 No. 15 No. 14 No. 11 1V or below Condition - 25 -...
  • Page 26 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 27 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...
  • Page 28 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. - 28 -...
  • Page 29 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 30 - 30 -...
  • Page 31 - 31 -...
  • Page 32 7-5 MAIN PWB ASS'Y AND PARTS LIST 7-5-1 MAIN PWB ASS'Y u u GR-R562/R602 - 32 -...
  • Page 33 7-5-2 MAIN PWB ASS'Y u u GR-S562/S602 - 33 -...
  • 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: Exploded View & Replacement Parts List

    #EV# 8. EXPLODED VIEW & REPLACEMENT PARTS LIST 8-1. M The parts of refrigerator and the shape of each part are subject to change in different localities. M Capacitors and fuse are optional parts. 281A u u GR-R562/602, GR-S562/602 301A 401A 281A 103B...
  • Page 43 #EV# u u GR-R562/602, GR-S562/602 405C 404A 405C 405A 330B 329A 203A 205A 201A 200A 201A 332A 205A 201A 212G 201A 212G 212A 212C 125A 212A 149A 131C 212C 212G 212C 125H 212A 212G 149A 131A 503B 210B 136A 131A 210A 212A 249B...
  • Page 44 #EV# u u GR-562/602 281A 301A 401A 103B 281B 103A 409A 411A 129A 418A 410G 410A 410H 158B 158A 410B 410C 282B 406B 304A 282J 110A 410J 409B 604E 158C 105A 604G 317A 318A 283B 307A 308A 314A 309A 310A 323B 106A 312A...
  • Page 45 #EV# u u GR-562/602 330B 405C 200A 404A 203A 405C 405A 201A 329A 205A 201A 332A 212G 205A 212G 212A 212C 212A 125A 149A 212C 210B 125H 131C 210A 149A 210B 136A 131A 210A 131A 136B 125A 125A 235A 149B 149B 230A 233A...
  • Page 46 P/No. 3828JD8858X JUN., 2005 Printed in Korea...

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