LG GR-349SQF.CEWQEHU Service Manual
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LG GR-349SQF.CEWQEHU Service Manual

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REFRIGERATOR
SERVICE MANUAL
CAUTION
PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK
BEFORE CHECKING OR OPERATING THE REFRIGERATOR .
MODEL:GR-349SQF.CEWQEHU
Color : Euro White

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Summary of Contents for LG GR-349SQF.CEWQEHU

  • Page 1 REFRIGERATOR SERVICE MANUAL CAUTION PLEASE READ CAREFULLY THE SAFETY PRECAUTIONS OF THIS BOOK BEFORE CHECKING OR OPERATING THE REFRIGERATOR . MODEL:GR-349SQF.CEWQEHU Color : Euro White...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ............................... 2 SERVICING PRECAUTIONS..............................3 SPECIFICATIONS................................... 4 PARTS IDENTIFICATION ............................... 5 REPLACEMENT OF DOOR OPENING TYPE ........................6 DISASSEMBLY..................................7-8 DOOR....................................7 DOOR SWITCH..................................7 FAN AND FAN MOTOR................................ 7 DEF' CONTROL ASM ................................8 LAMP....................................8 ADJUSTMENT...................................

  • Page 3: Servicing Precautions

    SERVICING PRECAUTIONS Air Recharging in Compressor vacuum operation is over, add the quantity in grams of R134a to the refrigeration system. Remember that every Test the refrigeration by connecting it electrically before system has an exact quantity of R134a with a tolerance of refilling operation.

  • Page 4: Specifications

    SPECIFICATIONS GC-389 1.Ref. No: ITEMS SPECIFICATIONS ITEMS SPECIFICATIONS DIMENSIONS (mm) 595(W) 626(D) 1880(H) Transparent Shelf(3 EA) NET WEIGHT (kg) REFRIGERATOR Vegetable Container(2 EA) COOLING SYSTEM Fan Cooling COMPARTMENT Vegetable Container Cover(1 EA) REFRIGERATOR Knob Dial Chilled Container(1 EA)* TEMPERATURE CONTROL FREEZER Button Dairy Pocket Cover(1 EA)

  • Page 5: Parts Identification

    PARTS IDENTIFICATION Freezer Temperature Control Egg Tray(1 or 2) Removable Rotatable Glass Shelf(2 or 3) Door Basket (3 or 5) Lamp Multi-air Flow Duct Fresh Meat Keeper (Optional) Utility Corner Refrigerator (movable) Temperature Control Vegetable Drawer Used to keep fruits Bottle Holder and vegetables, etc.

  • Page 6: Replacement Of Door Opening Type

    REPLACEMENT OF DOOR OPENING TYPE 1. PRECAUTION 2) Separating screw and remove the center hinge and the refrigerator door . Move the position of cap 1) Before reversing the door, first of all, you should take Move the position of bracket door and screw out food and accessories like shelves or trays which are not fixed in the refrigerator.

  • Page 7: Disassembly

    DISASSEMBLY 1 DOOR 2 DOOR SWITCH 1) Loosen four screws in upper part and disconnect top Freezer Door 1) Loosen 2 screws and pull the Lower Cover. cover. 2) Loosen hexagonal bolts fixing the lower hinge to the 2) Disconnect Lead Wire from switch. body to remove the freezer door only.

  • Page 8: Def' Control Asm

    4 FAN AND FAN MOTOR 6 DAMPER CONTROL 1) Remove the Cover Lamp, R and loosen 2 screw. 1) Remove freezer drawers. 2) Pull the Control Box, R and separate the lead wire 2) Remove two cap, screws and loosen two screws in Grille Fan. housing.

  • Page 9: Adjustment

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

  • Page 10: Olp (Over Load Protector)

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

  • Page 11: Troubleshooting

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

  • Page 12: Ptc And Olp

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

  • Page 13: Another Electric Component

    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 14: Service Diagnosis Chart

    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 switch is set to OFF. ¥ Set the switch to ON. ¥...

  • Page 15: Refrigerating Cycle

    5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE STATE OF STATE OF THE CAUSE REMARKS OF THE THE SET EVAPORATOR COMPRESSOR PARTIAL Freezer room and Low flowing sound of A little high ¥ A little Refrigerant LEAKAGE Refrigerator Refrigerant is heard and more than ¥...
  • Page 16 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 17: Micom Function & Pcb Circuit Explanation

    MICOM FUNCTION & PCB CIRCUIT EXPLANATION This description is made for GR-349, 389SQ. Please refer to overall PCB circuits for other models. 1 FUNCTION EXPOSITION 1) FUNCTION (1) The refrigerator starts from optimum condition when electric power is first on. But the operation condition changes "Mid" "Mid/Max"...
  • Page 18 4) DOOR OPENING ALARM (1) When the REFRIGERATOR DOOR is opened and won't be closed after 1 minute from the its opened, BUZZER sounds to notify it. (2) At frist, BUZZER sounds three times at each intervals of 0.5 second. Then makes a 0.5 second ON/OFF alarm three times at intervals of 30 seconds.
  • Page 19 8) SELF-TEST (1) Function to make service easy in case of occuring a trouble in the product. (2) When occurring a trouble, if the button is pushed, but the function could not operate. (3) If a toruble release during the representation of trouble, a refrigerator performs the normal function(RESET). (4) To represent a ERROR CODE, it use FREEZE TEMP LEDs on TOP COVER.
  • Page 20 9) FUNCTION TEST (1) Function to check the testing function of PCB and refrigerator and to find where the trouble. (2) The test switch is on the MAIN PCB of refrigerator. TEST FUNCTION is released and RESET after MAX. 2hours regardless of TEST MODE. (3) If the buttons on TOP COVER is pushed during TEST MODE, Function is not operated and only BUZZER ring with "DING~ DONG~"...
  • Page 21 2 FUNCTION DESCRIPTION 1) ELECTRIC CIRCUITS TRANS secondary side is composed of electric power circuits for RELAY driving electricity (12Vdc) and for supplying electricity to MICOM and IC (5Vdc). The voltage in each part is as follows. PARTS both ends of VA1 both ends of CM1 both ends of CM2 both ends of CE2...
  • Page 22 4) LOAD/BUZZER OPERATION, DOOR OPENING SENSING CIRCUIT (1) LOAD OPERATION CHECK COMP, KIND OF LOAD FAN MOTOR DEFROSTING HEATER COMP COOLING FAN MEASURING POINT (IC4) No.11 No.12 No.13 below 1V STATE • If the DOOR-R is opened during FAN MOTOR is operated, FAN MOTOR is stopped immediately. •...
  • Page 23 (3)BUZZER OPERATION CHECK CONDITIONS DISPLAY FUNCTION BUTTON RING DOOR OPEN ALARM MEASURING (DING~ DONG~) (SCREECHING) POINT 0.05s 0.2s 0.1s 0.5s 0.5s IC1 (No.14 Pin) IC1 (No.13 Pin) 2.66kh 2.232kh 3.1kh z (DING~) z (DONG~) - 23 -...
  • Page 24 5) TEMP SENSOR CIRCUITS (RTÐ SENSOR) (DEFROST SENSOR) (FREEZER COMPARTMENT SENSOR) The above circuit reads the surrounding temperature, DEFROSTING temperature and FREEZER ROOM temperature into MICOM(IC1). OPEN or SHORT state of each SENSOR is as follows. SENSOR CHECK POINT NORMAL (-30¡C~50¡C) SHORT OPEN ROOM TEMPERATURE...
  • Page 25 7) TEMPERATURE COMPENSATION FREEZER TEMPERATURE COMPENSATION FREEZER ROOM REMARKS RESISTANCE VALUES(R1) TEMPERATURE COMPENSATION 180 k½ + 5.0¡C COMPENSATE WARMLY 56 k½ +4.0¡C 33 k½ +3.0¡C 18 k½ +2.0¡C 12 k½ +1.0¡C 10 k½ 0¡C STANDARD 8.2 k½ -1.0¡C 5.6 k½ -2.0¡C 3.3 k½...
  • Page 26 ¥ TEMPERATURE COMPENSATION OF FREEZER ROOM Revi s ed resi s tance 470½ 2k½ 3.3k½ 5.6k½ 8.2k½ 10k½ 12k½ 18k½ 33k½ 56k½ 180k½ Present resi s tance 1¡C↑ 2¡C↑ 3¡C↑ 4¡C↑ 5¡C↑ 6¡C↑ 7¡C↑ 8¡C↑ 9¡C↑ 10¡C↑ 470½ COMPENSATE 1¡C↓ 1¡C↑...
  • Page 27 8) LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS FREEZER TEMP CONTROL KEY DISPLAY PART The above circuit is to judge the operation conditions of function key and to light each function indicating LED. It is operated by SCAN method. - 27 -...
  • Page 28 3. SENSOR RESISTANCE CHARACTERISTICS TABLE MEASURED TEMPERATURE RESISTANCE OF FREEZER SENSOR RESISTANCE OF DEFROST SENSOR, ROOM TEMPERATURE SENSOR -20¡C 22.3k½ 77k½ -15¡C 16.9k½ 60k½ -10¡C 13.0k½ 47.3k½ -5¡C 10.1k½ 38.4k½ 0¡C 7.8k½ 30k½ +5¡C 6.2k½ 24.1k½ +10¡C 4.9k½ 19.5k½ +15¡C 3.9k½...
  • Page 29 4. MAIN PWB ASS'Y AND PARTS LIST 1) MAIN PWB ASS'Y 6871JB1037 D1 D3 D4 D2 STICKER TRANS BUZZER R4 R18 R3 CC10 OSC1 J02 R7 J04 98 12 TEST COMP F-FAN D-HEATER RT-SENSOR CON2 CON1 CON3 R-DOOR - 29 -...

  • Page 30: Replacement Parts List

    2) REPLACEMENT PARTS LIST - 30 -...
  • Page 31 3) PWB ASS'Y, DISPLAY AND PARTS LIST - 31 -...
  • Page 32 PWB circuit drawing- The PWB circuit drawing may change without notice. ? ?? ?
  • Page 33 - 33 -...

  • Page 34: Exploded View

    EXPLODED VIEW & REPLACEMENT PARTS LIST 102A 103B 114A 103A 503B 102B 281B 120H 109C 406B 281F 120E 120B 501A 409B 120D 120A 120C 405C 304A 404A 282B 405A 604F 401A 329A 301A 330B 610E 332A 109A 105A 108A 407A 411A 283B 318A...
  • Page 35 230 A 233 A 231 A 235 A 136 E 241 A 249 B 241 A 249 C 136 F 249 A 145C 140 A 237 A 155 A 210 A 241 C 151 A 200 A 151 B 125 A 203 A 201 A 136Y...

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