LG GR302R Service Manual
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LG GR302R Service Manual

LG GR302R Service Manual

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MODEL(S): GR 302R
LRTN09314SW

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Summary of Contents for LG GR302R

  • Page 1 MODEL(S): GR 302R LRTN09314SW...

  • Page 2: Table Of Contents

    Contents Safety Precautions ----------------------------------------------- -------------------------------------- Service Precautions ----------------------------------------------------------------------------------- Specifications ------------------------------------------------------------------------------------------- Feature Chart ------------------------------------------------------------------------------------------- Circuit Diagram ------------------------------------------------------------------------------------------ Circuit Diagram ------------------------------------------------------------------------------------------ 6-7 - Cooling Systems ---------------------------------------------------------------------------------------- Product Disassembly ---------------------------------------------------------------------------------- 9-11 Doors ------------------------------------------------------------- ----------------------------------------- Door Switch ---------------------------------------------------------------------------------------------- Electronic Control Display PCB ----------------------------------------------------------------- --- Freezer Fan ---------------------------------------------------------------------------------------------- Defrost Control ------------------------------------------------------------------------------------------ Lamp -------------------------------------------------------------------------------------------------------...

  • Page 3: Service Precautions

    Service Precautions 0(absolute or -1 atm, -760 mm Hg.) It Refrigerant Recharging is not recommend to run the vacuum pump for more than 30 minutes. See Test the compressor's operation before recharging the refrigerant; this is very important to detect failures and to ensure the proper motor running, and to identify failures immediately.
  • Page 4 Service Precautions installed in one session, as it could keep refrigerant out of the system. block the compressor. Install 20~30 See Figure 5. grams at a time and close the valve. The compressor will run and the For gas charging, check the pressure will drop.
  • Page 5 tions...
  • Page 6 with humidity...

  • Page 7: Circuit Diagram

    2 Circuit Diagram...

  • Page 9: Cooling Systems

    Cooling Systems Direct System Indirect System Warm Air Cold Air Important: Check that the air ducts are not obstructed for a better cooling performance. Temperature variation during defrosting time, depending upon the cooling system . Refrigerator Temp.( ? ) Indirect System Freezer Temp.( ? ) Direct System...

  • Page 10: Product Disassembly

    3. Product Disassemble. Doors 2. Disconnect all switche's cables. Freezer Door See Figure 8 1. Remove hinge cover by pulling it upwards. 2. Loosen the hexagonal bolts that hold the upper hinge in place. See Figure 1. 3. Remove door. See Figure 2. Figure 7 Figure 8 Control Circuit ( Display PWB)

  • Page 11: Defrost Control

    Defrost Control Assembly 1. The defrost control assembly consists of one thermistor and a fuse that melts with heat. 2. The termistor's function is to sense the compartment's temperature and automatically stop the defrost. The termistor is Figure 13 located beside of the evaporator bracket.

  • Page 12: Refrigerator Control Box

    Figure 13 Figure 19 Refrigerator Control Box. Remove the lamp cover as mentioned before. 1. Loosen the screws. 2. Remove the entire control box. See Figure 20. 3. Disconnect the control box connector. See Figure 21. Figure 20 Figure 21...

  • Page 15: Adjustments

    5. Adjustments 1- COMPRESSOR 2- PTC 1-1 Function 2-1 PTC Composition The compressor sucks low pressure (1) The PTC (Thermistor) is a evaporated gas from the evaporator semiconductive starting and compresses it into high component that is made with temperature/high pressure gas and BaTiO .
  • Page 16 2-4 Motor restarting and PTC cooling. 2-6 Note on using the starting PTC (1) To restart normal operation after a (1) Be careful not to cause an power interruption, wait 5 minutes overvoltage or short circuit. to let the pressure equalize and (2) Do not force or bump it.

  • Page 17: Ptc Starter

    6. Troubleshooting 6-1 COMPRESSOR AND ELECTRIC COMPONENTS Go to Step 2 (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. Replace OLP. Go to Step 5 OLP disconnected?.

  • Page 18: Ptc & Olp

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

  • Page 19: Other Electrical Components

    6-3 OTHER ELECTRIC COMPONENTS No Cooling Compressor Check if current flows to Cause doesn´t run. the following components. a. Starting Devices Shorted or Broken b. OLP Poor contact or shorted. c. Compressor coil Coil Shorted. Replace each d. Circuit Parts Poor contact or shorted.

  • Page 20: Service Diagnosis Chart

    6-4 SERVICE DIAGNOSIS CHART COMPLAINT POINTS TO BE CHECKED REMEDY Is the power cord unplugged? Plug it to the outlet. · Check if the power switch is set to OFF. · Set the switch to ON. Check if the fuse of power switch is No Cooling ·...

  • Page 21: Refrigerating Cycle

    6-5 REFRIGERATING CYCLE Troubleshooting Chart TEMPERATURE REFRIGERAT EVAPORATOR CAUSE OF THE REMARKS CONDITION CONDITION COMPRESSOR Freezer and Low flowing sound of A little higher than A little refrigerator Refrigerator don´t refrigerator is heard ambient temperature. has leaked. PARTIAL get cold normally. and frost forms in inlet Refrigerator runs LEAKAGE...
  • Page 22 General Control of Refrigerating Cycle. ITEMS CONTENTS AND REMARKS SPECIFICATIONS Chemical Ingredients Ag: 30%, Cu: 27%, Zn: 23%, Cd: 20% Brazing Temperature: 710 ~840°C Recommended H34 containing 34% Ag in the WELDING ROD BCuP Service Center. Chemical Ingredients Cu: About 93% P: 6.8 % Rest: within 0.2% Brazing Temperature: 735~840°C...
  • Page 23 7. MICOM Function & 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 cycles through Medium Medium/High High Medium/Low Medium. 2. When the power is initially applied or restored after a power failure, it is automatically set to Medium.
  • Page 24 7-1-2 DEFROSTING 1. The defrosting is performed each time when the total running time of the compressor reaches 10 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. 3.
  • Page 26 7-2 PCB FUNCTION 7-2-1 POWER CIRCUIT The second part of the Transformer is composed of the power supply for the display and relay drive (12 Vdc) and for the MICOM and IC (5 Vdc). The voltage for each part is as follows: VA1 prevents overvoltage and noise.
  • Page 27 7-2-2 OSCILLATION CIRCUIT This circuit is to generate the base clock for calculating time and the synchro clock for transmitting data to and from the inside logic elements of the IC1 (MICOM). Be sure to use the exact replacement parts since the calculating time by the IC1 may be changed or it will not work if he OSC1 SPEC is changed.
  • Page 28 7-2-4 LOAD DRIVE CIRCUIT 1. Load Drive Condition Check FEEZER COOLING MELTING DEFROST FUSE HEATER Compressor, Freeze Fan Load Type Defrosting Heater Motor Measurement Location 1 V or below Condition 12 V...

  • Page 29: Short Circuit

    7-2-5 TEMPERATURE SENSOR CIRCUIT REFRIGERATOR-SENSOR DEFROST-SENSOR The upper CIRCUIT reads REFRIGERATOR temperature and DEFROST - SENSOR temperature for defrosting into MICOM. OPENING or SHORT state of each TEMPERATURE SENSOR are as follows: SHORT- SENSOR CHECK POINT NORMAL (-30 -50) OPEN CIRCUITED Refrigerator Sensor POINT A Voltage...
  • Page 30 7-2-6 TEMPERATURE COMPENSATION & OVERCOOLING/UNDERCOOLING COMPENSATION CIRCUIT Refrigerator Temperature Compensation Refrigerator Temperature Remark Resistance Compensation (RCR1) °F (°C) (+5.0) Compensation by raising 180 KW the temperature 39.2 (+4.0) 56 KW 37.4 (+3.0) 33 KW 35.6 (+2.0) 18 KW 35.24 (+1.8) 12 KW ( 0 ) 10 KW...
  • Page 31 7.2.7 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.
  • Page 32 7-3. RESISTANCE SPECIFICATION OF SENSOR TEMPERATURE SENSOR RESISTANCE OF REFRIGERATOR (DEFROST) SENSOR (°C) °F 47.3 38.4 24.1 19.5 15.9 The resistance of SENSOR HAS 5% common difference. Measure the resistance of SENSOR after leaving it over 3 minutes in measuring temperature. This postponing is necessary because of perceiving speed.
  • Page 33 7-4. TROUBLE SHOOTING * Replace the PWB when there´s no trouble after checking the contents of trouble.
  • Page 35 7-4 MAIN PWB ASSEMBLY AND PARTS LIST. 7-4-1 MAIN PWB ASSEMBLY.
  • Page 37 7.5 PWB DIAGRAM...
  • Page 39 8 . EXPLODED VIEW...
  • Page 41 REPLACEMENT PARTS LIST...
  • Page 43 MAY, 2005 Printed in México P/No. 3828JD8331B...

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