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LG GR-399 User Manual

LG GR-399
41 pages
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CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
MODEL: GR-359/399
REFRIGERATOR
SERVICE MANUAL
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LG GR-399 Specifications

General IconGeneral
Number of Doors2
ColorWhite
TypeTop Freezer
Dimensions (H x W x D)1680 x 600 x 630 mm
Weight57 kg

Summary

SAFETY PRECAUTIONS

SERVICING PRECAUTIONS

Features of refrigerant (R600a)

Properties and characteristics of R600a refrigerant.

Installation place

Requirements for the refrigerator's installation environment.

Utilities

List of required tools and equipment for servicing.

Make sure before Servicing

Pre-service checks before starting work.

Air Recharging in Compressor

Procedure for recharging refrigerant and related steps.

SPECIFICATIONS

PARTS IDENTIFICATION

REPLACEMENT OF DOOR OPENING TYPE

PRECAUTION

Important safety and handling notes before door reversal.

HOW TO REVERSE THE DOORS

Step-by-step instructions for reversing refrigerator doors.

DISASSEMBLY

DOOR

Procedures for disassembling freezer and refrigerator doors.

DOOR SWITCH

Steps to disassemble the door switch.

REFRIGERATOR ROOM LAMP

Procedure for removing and replacing the refrigerator lamp.

FAN AND FAN MOTOR

Steps for disassembling the fan and fan motor.

DEFROST CONTROL ASSY

Explanation and replacement of the defrost control assembly.

DAMPER CONTROL

Steps for disassembling the damper control.

HEATER, SHEATH & HEATER, CORD-L

Information and replacement of defrosting heaters.

ADJUSTMENT

COMPRESSOR

Role, composition, and usage notes for the compressor.

PTC-STARTER

Composition, role, circuit, and usage notes for the PTC starter.

CIRCUIT DIAGRAM

TROUBLESHOOTING (Mechanical Part)

COMPRESSOR AND ELECTRIC COMPONENTS

Troubleshooting flowchart for compressor and related electrical parts.

RELAY ASSY (PTC AND OLP)

Troubleshooting steps for the relay assembly (PTC and OLP).

ANOTHER ELECTRIC COMPONENTS

Troubleshooting for other electrical components like thermistor, fan, heater.

SERVICE DIAGNOSIS CHART

Chart correlating complaints with points to check and remedies.

REFRIGERATING CYCLE

General Control of Refrigerating Cycle

Details on components and procedures for controlling the refrigerating cycle.

MICOM FUNCTION & PCB CIRCUIT EXPLANATION

FUNCTION EXPOSITION

Overview of the refrigerator's operating functions and 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 function and its behavior.

DEFROSTING

Details on the automatic defrosting process and related sensors.

ORDERLY OPERATION OF ELECTRIC PARTS

Sequence of operation for electrical components like compressor, heater, fan.

SELF-TEST

Functionality and process for the self-test feature.

FUNCTION TEST

Procedure for testing PCB and refrigerator functions.

FUNCTION DESCRIPTION

ELECTRIC CIRCUITS

Description and voltage distribution of electric power circuits.

OSCILLATION CIRCUIT

Explanation of the oscillation circuit for timing and clock generation.

RESET CIRCUIT

Explanation of the reset circuit for MICOM initialization.

LOAD/BUZZER OPERATION AND DOOR OPENING SENSING

Checks and circuits for load operation, buzzer, and door sensing.

BUZZER OPERATION CHECK

Detailed checks for buzzer operation during button ring and door alarms.

TEMP SENSOR CIRCUITS

Circuit diagram and explanation of temperature sensor inputs.

SWITCH INPUT CIRCUIT

Circuit diagram for test switch input.

TEMPERATURE COMPENSATION

Table and explanation for freezer temperature compensation.

LIGHTING CIRCUITS OF KEY BUTTON INPUT AND DISPLAY PARTS

Circuits for lighting key buttons and display indicators.

SENSOR RESISTANCE CHARACTERISTICS TABLE

Table of resistance values for freezer and defrost sensors at different temperatures.

MAIN PWB ASS'Y AND PARTS LIST

MAIN PWB ASS'Y

Diagram of the main Printed Wiring Board (PWB) layout.

REPLACEMENT PARTS LIST

List of replaceable parts with part numbers and specifications.

PWB ASS'Y, DISPLAY AND PARTS LIST

Diagram of the display PWB and associated parts list.

PWB CIRCUIT DRAWING

EXPLODED VIEW & REPLACEMENT PARTS LIST

REPLACEMENT PARTS LIST

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