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LG LMH2235ST User Manual

LG LMH2235ST
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MICROWAVE OVEN
SERVICE MANUAL
MODEL: LMH2235ST
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL06272534
June, 2014
Printed in Korea
Website: http://biz.lgservice.com
Internal Use Only
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LG LMH2235ST Specifications

General IconGeneral
Styleover-the-range
Colorstainless steel
Total Capacity2.2 cubic feet
Power Levels10
Venting Typeconvertible
Sensor Cookingyes
Child Lockyes
Timeryes
Microwave Power1000 watts
Voltage120 volts
Weight and Dimensions IconWeight and Dimensions
Depth15 13/16 inches
Height17 15/16 inches
Width29 7/8 inches
Net Weight73.5 pounds

Summary

Safety Precautions for Service Technicians

Microwave Energy Exposure Prevention

Guidelines to prevent excessive microwave energy exposure during servicing.

Specifications

Appliance Specifications

Technical details including power, dimensions, and components.

Switch Chart

Table detailing switch modes and states for interlock and monitor switches.

Cautions

High-Voltage and Repair Cautions

Warnings about handling high-voltage components and general repair safety.

Microwave Radiation Hazards

Precautions regarding microwave radiation exposure during servicing.

Installation

Installation Precautions

Instructions for safely installing the microwave oven unit.

Grounding Instructions

Importance and procedure for grounding the appliance for electrical safety.

Operation

Control Panel Overview

Identifies and illustrates the various buttons and indicators on the microwave's control panel.

Control Panel Function Explanation

Detailed description of each button and its function on the control panel.

Wiring Diagram and Key Matrix

Wiring Diagram

Schematic representation of the internal electrical connections and components of the microwave.

Key Matrix

A table mapping input keys to their corresponding functions and internal codes.

Troubleshooting

General Service Information

General precautions and trial operation procedures before performing troubleshooting.

Safety Cautions During Troubleshooting

Critical safety warnings and precautions for service technicians, especially regarding high voltage.

Self-Diagnosis and Error Codes

Procedures for accessing self-diagnosis modes and interpreting error codes.

Basic Component Check Summary

A summary of basic checks, often presented as flowcharts or diagrams for diagnosing issues.

Troubleshooting Flowcharts

Diagnostic flowcharts for specific symptoms like 'No Display or Dead'.

Microwave Leakage Test

Equipment and Measurement Procedures

Lists required equipment and details the steps for measuring microwave energy leakage.

Measurement and Record Keeping

Guidelines for measuring leakage and recording results.

Power Output Measurement

Measurement Procedure and Formula

Steps and formula for measuring the microwave power output using a water load.

Interlock System

Interlock Mechanism and Adjustment

Details the door interlock mechanism and procedures for adjusting latches and switches.

Latch and Switch Sequence Testing

Testing the correct operational sequence of the interlock switches.

Microwave Leakage Test Requirements

Reiteration of leakage testing requirements after interlock system servicing.

Interlock Switches Continuity Test

Procedures for testing the continuity of interlock switches.

Component Testing Information

Transformer and Magnetron Testing

Resistance testing procedures and normal values for the transformer and magnetron.

Capacitor, Diode, and Relay Testing

Procedures for testing capacitor, diode, and relay continuity and resistance.

Turntable Motor and Noise Filter Testing

Resistance testing for the turntable motor and noise filter.

Touch Key Board Testing

Resistance testing for the touch key board and its connector.

Disassembly Instructions

Removing Power and Control Circuit Board

Step-by-step guide for removing the main power and control circuit board assembly.

Removing the Outer Case

Instructions for safely removing the outer casing of the microwave oven.

Removing Door Interlock Switches

Detailed steps for removing the door interlock switches from the latch board.

Removing the Magnetron

Procedures for carefully removing the magnetron assembly, including safety notes.

Removing the Stirrer Fan

Instructions for removing the stirrer fan and its cover.

Door Removal and Disassembly

Steps for removing the entire door and disassembling the door screen and choke.

Door Assembly

Guidelines for correctly mounting and adjusting the door assembly.

Removing the Ventilation Fan Assembly

Steps for removing the ventilation fan motor and bracket.

Removing the Turntable Motor

Procedures for removing the turntable motor and its base plate.

Exploded View

Model and Parts Overview

Overview of the exploded view section, listing model and product codes.

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