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LG MS-194A - Service Manual

LG MS-194A
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MICROWAVE OVEN
SERVICE MANUAL
MODEL: MS-194A
CAUTION
BEFORE SERVICING THE UNIT, READ THE
SAFETY PRECAUTIONS IN THIS MANUAL.

Questions and Answers

  • K
    Karen MillerAug 19, 2025
    How to fix an LG MS-194A that does not work?
    • L
      lauren49Aug 19, 2025
      If your LG Microwave Oven isn't working, make sure you're not using other electrical appliances simultaneously. Also, ensure the microwave oven plug is securely inserted into the outlet.
  • C
    Colton WyattAug 21, 2025
    What to do if LG MS-194A Microwave Oven display is on but it won't start?
    • K
      Kayla JeffersonAug 21, 2025
      If the display of your LG Microwave Oven shows all figures set, but the oven doesn't start cooking when the START pad is touched, it could be due to several defective components. These include the secondary switch, PCB assembly, fan motor, or oven lamp. Each of these components would need to be replaced.
  • D
    david90Aug 23, 2025
    Why does the LG MS-194A Microwave Oven display nothing and not respond?
    • A
      Arthur KelleyAug 23, 2025
      If the display window of your LG Microwave Oven doesn't show any figures and no input is accepted, it could be due to a blown fuse, a malfunction of the monitor switch, or defective components like the high voltage capacitor, thermostat, or power supply cord. Each of these parts would need to be replaced to resolve the issue.
  • P
    pwilliamsAug 26, 2025
    Why no microwave oscillation in my LG MS-194A Microwave Oven?
    • G
      Gina TranAug 26, 2025
      If your LG Microwave Oven lamp and fan motor run, but there is no microwave oscillation, it could be due to a defective PCB assembly, magnetron, circuit protector, high voltage transformer, high voltage capacitor, or high voltage diode. Each of these components would need to be replaced.
  • K
    Kathryn SmithAug 27, 2025
    What to do if my LG MS-194A is not heating properly?
    • A
      Adam BlankenshipAug 28, 2025
      If your LG Microwave Oven seems to be operating, but little heat is produced, the issue could stem from several components. The PCB assembly or the magnetron might be defective, requiring replacement.
  • K
    Katherine JacksonAug 29, 2025
    Why is my LG MS-194A power so low?
    • M
      Mr. Peter ClineAug 30, 2025
      If the output power of your LG Microwave Oven is too low, it may be due to low AC input voltage. Ensure you are using the microwave oven at an adequate line voltage.
  • V
    Veronica KellerAug 31, 2025
    Why does my LG MS-194A not heat but the light and fan are on?
    • E
      Elijah GonzalezSep 1, 2025
      If your LG Microwave Oven lamp and fan motor run, but there's no microwave oscillation, it could be due to a defective PCB assembly, magnetron, circuit protector, high voltage transformer, high voltage capacitor, or high voltage diode. You should replace the PCB assembly, magnetron, circuit protector, high voltage transformer, high voltage capacitor, or high voltage diode.
  • M
    Mallory WatsonSep 3, 2025
    Why is the output power too low on my LG Microwave Oven?
    • A
      Andrew DixonSep 3, 2025
      If your LG Microwave Oven isn't heating food adequately, it could be due to a low AC input voltage. Ensure you are using the microwave at an adequate line voltage. Another possibility is that the food temperature is too low; in this case, the food may need to be cooked for a longer period.
  • S
    Sean GarciaSep 5, 2025
    What to do if sparks occur in LG Microwave Oven?
    • J
      Justin FosterSep 5, 2025
      Sparks in your LG Microwave Oven can be caused by using metallic ware or ceramic ware trimmed in gold or silver power. Do not use metallic ware for cooking except where noted in the cooking guide and do not use any type of cookware with metallic trimming. Sparks can also be caused by uneven cooking. To solve this: * Wrap the thinner part with aluminum foil. * Use plastic wrap or lid. * Stir once or twice while cooking soup, cocoa or milk, etc.
  • A
    Abigail GarciaSep 7, 2025
    What to do if my LG MS-194A is sparking?
    • K
      Kaitlin FlowersSep 7, 2025
      If sparks occur in your LG Microwave Oven, it could be due to using metallic ware or ceramic ware with metallic trimming. Do not use metallic ware for cooking, except as noted in the cooking guide, and avoid cookware with metallic trimming.

Summary

SAFETY PRECAUTIONS

CAUTION MICROWAVE RADIATION

Warning against exposure to radiation from microwave generating parts.

SPECIFICATIONS

MODEL MS-194 A

Technical specifications for the MS-194A model microwave oven.

Power Requirement

Electrical requirements for the microwave oven.

Power Output

The microwave power output rating.

Microwave Frequency

The operating frequency of the microwave.

Magnetron

The type of magnetron used in the oven.

Timer

The range of the oven's timer function.

Outside Dimensions

Physical dimensions of the microwave oven.

Cavity Dimensions

Internal dimensions of the microwave oven cavity.

Net Weight

The weight of the microwave oven.

Shipping weight

The weight of the microwave oven for shipping.

Control Complement

Details on the microwave's power control features.

Nameplate Location

Location of the oven's nameplate.

Accessories

Included accessories with the microwave oven.

CAUTIONS

MICROWAVE RADIATION

Warning about exposure to microwave energy.

High Voltage Capacitor Warning

Caution about discharging the high voltage capacitor.

INSTALLATIONS

INSTALLING

Instructions for physically installing the microwave oven.

EARTHING INSTRUCTIONS

Guidelines for properly earthing the appliance.

OPERATING INSTRUCTIONS

FEATURES

Overview of the microwave oven's key features.

CONTROL PANEL

Detailed explanation of the control panel layout and buttons.

OPERATING SEQUENCE

Step-by-step guide on how the oven functions operate.

SCHEMATIC DIAGRAM

CIRCUIT DESCRIPTION

SERVICE INFORMATION

TOOLS AND MEASURING INSTRUMENTS

List of tools and instruments required for servicing.

MICROWAVE LEAKAGE TEST

Procedure for testing microwave leakage.

MEASURING MICROWAVE ENERGY LEAKAGE

Method for measuring microwave energy leakage.

MEASUREMENT WITH OUTER CASE REMOVED

Procedure for measuring microwave energy leakage with the outer case removed.

MEASUREMENT OF MICROWAVE POWER OUTPUT

Procedure for measuring the microwave power output of the oven.

INTERLOCK CONTINUITY TEST

Procedure for testing the continuity of interlock switches.

COMPONENT TEST PROCEDURE

Step-by-step testing procedures for various oven components.

TROUBLE SHOOTING

Guide to diagnosing and resolving common microwave oven problems.

EXPLODED VIEW

INTRODUCTION

Introduction to the exploded view section.

DOOR PARTS

Exploded view of the door components.

CONTROL PANEL PARTS

Exploded view of the control panel components.

OVEN CAVITY PARTS

Exploded view of the oven cavity components.

LATCH BOARD PARTS

Exploded view of the latch board components.

INTERIOR PARTS

Exploded view of the interior components.

BASE PLATE PARTS

Exploded view of the base plate components.

2-1. Function & Type (1;2)

How a Microwave Oven Works

Explanation of how a microwave oven functions.

Type of Microwave Oven

Classification of different types of microwave ovens.

MICROWAVE COOKING (solo model)

Description of solo microwave cooking mode.

2-1. Function & Type (2;2)

GRILL COOKING

Explanation of the grill cooking function.

CONVECTION COOKING

Explanation of the convection cooking function.

COMBINATION COOKING

Explanation of combination cooking modes.

2-2. Installation & Utensils (1;2)

Installation

Instructions for installing the microwave oven and initial setup.

2-2. Installation & Utensils (2;2)

COOKING UTENSILS

Guide on suitable utensils for microwave and grill cooking.

3-1. Whats the microwave? (1;2)

History of dielectric heating

Historical background of dielectric heating technology.

The principle of dielectric heating

Explanation of how dielectric heating works in microwaves.

3-1. Whats the microwave? (2;2)

The safety of microwave oven

Information on the safety features of microwave ovens.

Definition of electric wave

Definition and properties of electric waves used in microwaves.

3-2. Conventional heating vs. dielectric heating

Conventional heating

Explanation of conventional heating methods.

Dielectric heating

Detailed explanation of dielectric heating principles.

4-1. Construction of microwave oven

Cavity

Description of the oven cavity's function.

Door

Description of the oven door structure.

Controller

Role of the controller in oven operation.

Magnetron

Function of the magnetron in injecting microwaves.

4-2. How does the microwave oven operate?

4-3. WARNING - High voltage circuit ( 4,000 volt)

4-4. Microwave generation system_Magnetron (1;2)

4-4. Microwave generation system_Magnetron (2;2)

TESTING MAGNETRON TUBE

Procedures for testing the magnetron tube.

5-1. Multiwave system

What is Multi-Wave

Explanation of the Multi-Wave system for even cooking.

5-2. Infrared sensor

Whats the infrared sensor?

Explanation of the infrared sensor's function and benefits.

5-3. Auto moving heater

Whats does move automatically?

Explanation of the auto moving heater feature.

SCHEMATIC DIAGRAM OF P.C.B

PRINTED CIRCUIT BOARD

LG MS-194A Specifications

General IconGeneral
Capacity19 liters
TurntableYes
Cooking Levels5
ColorWhite
Power700 watts

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