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LG GR-389SQF Service Manual

LG GR-389SQF
41 pages
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CAUTION
BEFORE SERVICING THE UNIT,READ THE “SAFETY
PRECAUTIONS” IN THIS MANUAL.
MODEL:GR-349/389SQF
REFRIGERATOR
SERVICE MANUAL
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LG GR-389SQF Specifications

General IconGeneral
Door hingeRight
Product colorWhite
Appliance placementFreestanding
Door open alarmYes
Total gross capacity303 L
Annual energy consumption480 kWh
Star rating4*
Freezer gross capacity86 L
Fridge net capacity217 L
Package weight82000 g
Weight and Dimensions IconWeight and Dimensions
Depth626 mm
Width595 mm
Height1880 mm
Weight77000 g

Summary

Servicing Precautions

Specifications

Parts Identification

Replacement of Door Opening Type

Disassembly

Door

Procedure for disassembling the refrigerator door.

Door Switch

Procedure for disassembling and accessing the door switch.

Refrigerator Room Lamp

Procedure for removing and replacing the refrigerator room lamp.

Fan and Fan Motor

Procedure for disassembling the fan and fan motor assembly.

Defrost Control Assy

Procedure for disassembling and replacing the defrost control assembly.

Damper Control

Procedure for disassembling the damper control unit.

Heater, Sheath

Procedure for disassembling and replacing the sheath heater.

Adjustment

Compressor

Explanation of compressor role, composition, and usage notes.

PTC-Starter

Explanation of PTC-starter composition, role, and circuit diagram.

OLP (Over Load Protector)

Explanation of OLP definition, role, and connection diagram.

Circuit Diagram

Detailed circuit diagrams for refrigerator operation.

Troubleshooting (Mechanical Part)

Compressor and Electric Components

Troubleshooting steps for compressor and related electrical components.

PTC and OLP

Troubleshooting steps for PTC starter and Over Load Protector.

Another Electric Components

Troubleshooting for other electric components like fan motor and heater.

Service Diagnosis Chart

Diagnostic chart for common refrigerator complaints and remedies.

Refrigerating Cycle

Leakage Detection

Procedure for detecting refrigerant leakage in the system.

General Control of Refrigerating Cycle

MICOM Function & PCB Circuit Explanation

Function Exposition

Overview of refrigerator functions and operational modes.

Quick Freezer

Explanation of the Quick Freezer function and its operation.

Vacation Function

Explanation of the Vacation function for energy saving.

Door Opening Alarm

Explanation of the door opening alarm system and its triggers.

Defrosting

Explanation of the automatic defrosting process and its timing.

Self-Test

Procedure for self-testing refrigerator functions and identifying error codes.

Function Test

Procedure for testing PCB and refrigerator functions and identifying faults.

Function Description

Electric Circuits

Explanation of the main electric circuits, including power supply and voltage distribution.

Oscillation Circuit

Description of the oscillation circuit for generating clock signals.

Reset Circuit

Explanation of the reset circuit for initializing the MICOM.

LOAD/BUZZER OPERATION, DOOR OPENING SENSING CIRCUIT

Description of load operation checks and door opening sensing circuit logic.

Buzzer Operation Check

Procedure for checking buzzer operation for display functions and door alarms.

Temp Sensor Circuits

Explanation of temperature sensor circuits and their resistance characteristics.

Switch Input Circuit

Description of the switch input circuit for testing refrigerator functions.

Temperature Compensation

Table and explanation for adjusting freezer room temperature compensation values.

Lighting Circuits of Key Button Input and Display Parts

Description of lighting circuits for key buttons and display parts.

Sensor Resistance Characteristics Table

Main PWB Assy and Parts List

Replacement Parts List

List of replacement parts with part numbers, specifications, and remarks.

PWB Assy, Display and Parts List

PWB Circuit Drawing

Exploded View & Replacement Parts List

Replacement Parts List

Replacement Parts List