Table of Contents
Troubleshooting
Related Manuals for LG LMV1762ST
Summarization of Contents
Safety Precautions
Service Technician Safety Warnings
Crucial safety guidelines for technicians regarding microwave energy exposure.
Foreword
Manual Reading Emphasis
Stresses careful reading of the manual to prevent microwave energy exposure.
1. Specifications
Model, Power, and Component Details
Lists power, frequency, components, dimensions, and switch chart for the model.
2. Cautions
High-Voltage and Microwave Radiation Hazards
Warnings about high voltage and avoiding microwave radiation during servicing.
3. Installation
Installation Precautions and Grounding
Guidelines for proper placement, connection, and grounding of the microwave oven.
4. Operation
Control Panel Layout and Functions
Diagram and explanations of the microwave oven's control panel buttons and features.
5. Wiring Diagram / Key Matrix
Wiring Diagram and Wire Color Code
Schematic showing electrical connections and a table of wire color symbols.
Key Matrix Layout
Table mapping keypad buttons to their functions and matrix positions.
6. Troubleshooting
General Service Precautions and Trial Operation
Precautions for operating and testing the microwave oven during service.
Safety Cautions and Self-Diagnosis
Safety warnings for technicians and procedure for self-diagnosis.
Basic Check Summary and Door Operation
Schematic illustrating troubleshooting symptoms and checks for door operation.
Troubleshooting Flowcharts: Power, Display, Keypad, Control Issues
Flowcharts for diagnosing no display, power off, keypad, and control key problems.
Troubleshooting Flowcharts: Operational and Component Issues
Flowcharts for no heat, motor, automatic activation, and related component tests.
7. Microwave Leakage Test
Leakage Test Equipment and Procedure
List of required equipment and procedure for measuring microwave energy leakage.
Leakage Measurement and Record Keeping
Methods for measuring leakage with case removed/assembled and recording results.
8. Power Output Measurement
Power Measurement Procedure
Detailed steps for measuring the microwave's power output using a water load.
Power Output Formula and Variables
Formula and definitions for calculating microwave power output.
9. Interlock System
Interlock Mechanism and Adjustment
Description of the door lock mechanism and procedures for adjusting switches.
Latch and Switch Sequence Test
Testing the sequence of operation for interlock switches.
Interlock Switch Continuity Tests
Continuity testing procedures for primary, monitor, and secondary interlock switches.
10. Component Testing Information
Transformer and Magnetron Testing
Resistance testing procedures for transformer and magnetron components.
Capacitor, Diode, Relay, and Motor Testing
Tests for capacitor, diode, relay, turntable motor, and ventilation motor.
Noise Filter and High Voltage Fuse Testing
Resistance testing for noise filter and high voltage fuse.
Touch Key Board Testing
Resistance testing of the touch key board connector and matrix.
11. Disassembly Instructions
Removing Power and Control Circuit Board
Steps for removing the control panel and circuit board assembly.
FPC Connector Removal and Insertion
Detailed instructions for removing and inserting FPC connectors.
Removing the Outer Case
Steps for removing the outer casing of the microwave oven.
Removing Door Interlock Switches
Procedure for disconnecting and removing door interlock switches.
Removing Magnetron and Stirrer Fan
Instructions for removing the magnetron and stirrer fan components.
Removing and Disassembling the Door
Steps for removing and taking apart the microwave oven door.
Removing Turntable Motor
Detailed steps for removing the turntable motor assembly.
12. Exploded View
Model Information
Table listing customer, product, and service models.
Exploded View Overview
Diagram showing major assembly sections of the microwave.
Door and Controller Parts
Illustrated parts breakdown for door and controller assemblies.
Oven Cavity and Latch Board Parts
Illustrated parts breakdown for oven cavity and latch board assemblies.
Interior and Installation Parts
Illustrated parts breakdown for interior and installation components.
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