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LG MH-794GS User Manual

LG MH-794GS
39 pages
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MICROWAVE/
GRILL OVEN
SERVICE MANUAL
MODEL : MH-794GS
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS
IN THIS MANUAL.
August, 1999
P/NO. 3828W5S1308 Printed in Korea
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LG MH-794GS Specifications

General IconGeneral
TypeMicrowave Oven
Capacity20 l
Power Output700 W
Control TypeMechanical
TurntableYes
Weight10.5 kg
Microwave Power700 W
ColorSilver
Turntable Diameter245 mm
Voltage230 V
Frequency50 Hz

Summary

Safety Precautions

Servicing Safety Precautions

Crucial safety measures for service personnel regarding microwave energy.

Microwave Radiation Warning

Warning about potential exposure to microwave radiation during operation.

Specifications

Installations

Microwave Oven Installation Guide

Step-by-step guide for properly setting up the microwave oven.

Earthing Instructions

Important guidelines for correctly earthing the microwave oven.

Operating Instructions

Microwave Oven Features

Overview of the microwave oven's key features and capabilities.

Control Panel Overview

Detailed explanation of the microwave's control panel layout and functions.

Operating Sequence Guide

Step-by-step guide on how to operate the microwave oven.

Special Operating Functions

Details on Child Lock, Quick Start, More/Less, and Temperature settings.

Diagram Schematic

Circuit Description

General Circuit Details and Functions

Overview of electrical components, power control, and interlock systems.

Cooking Mode Sequences

Explanation of sequences for different cooking modes like microwave and grill.

Service Information

Tools and Measuring Instruments

List of essential tools and instruments for servicing the microwave.

Microwave Leakage Testing Procedures

Procedures and precautions for testing microwave energy leakage.

Leakage Measurement Methods

Techniques for measuring leakage with the case removed and assembled.

Measurement Notes and Record Keeping

Guidelines for accurate measurement and documentation of results.

Measurement of Microwave Power Output

Disassembly and Adjustment Procedures

Basic Component Removal

Instructions for removing outer case, power cord, and control panel.

High Voltage Section Removal

Steps to remove door, transformer, capacitor, diode, and fan motor.

Motor and Sensor Assembly Removal

Guides for removing magnetron, turntable motor, heater motor, and sensor.

PCB and Interlock System Handling

Procedures for removing PCB and installing/adjusting interlock systems.

Interlock Continuity Test

Switch Continuity Testing

Procedures to test continuity of primary, secondary, and monitor switches.

Component Test Procedure

High Voltage Transformer & Magnetron Testing

Methods to test resistance of high voltage transformer and magnetron.

Capacitor, Diode, Fuse & Heater Testing

Procedures to test key electrical components like capacitor, diode, fuse, and heater.

Relay, Keypad & Sensor Testing

Methods to test continuity and resistance of relays, keypad, and sensor.

Trouble Shooting Guide

Oven Not Operating Issues

Diagnosing and resolving problems when the oven does not operate.

Cooking Function Failures

Troubleshooting issues with microwave cooking, grill, and uneven cooking.

Error Mode Diagnosis

Identifying and resolving error codes like E-01, E-02, E-03.

Exploded View

Door Parts Identification

Detailed illustration of individual components within the door assembly.

Control Panel Parts Identification

Detailed illustration of individual components within the control panel assembly.

Oven Cavity Parts Identification

Detailed illustration of individual components within the oven cavity.

Latch Board Parts Identification

Detailed illustration of individual components within the latch board assembly.

Interior Parts Identification

Detailed illustration of individual components located inside the oven.

Base Plate Parts Identification

Detailed illustration of individual components of the base plate.

Micom Controller Schematic Diagram

Micom Controller P.C.B. Layout