Samsung MR7491G User Manual (English)

Questions and Answers:

R
Robert JacksonAug 19, 2025
What to do if Samsung MR7491G Microwave Oven timer starts but no heat?
- D
  Donald AndersonAug 19, 2025
  If your Samsung Microwave Oven timer starts counting down, but there's no microwave oscillation (no heat, but the oven lamp and fan motor turn on), it could be due to several reasons: * Misalignment of latch switches. * Open or loose connection of the high voltage circuit, especially the magnetron filament circuit. * Defective high voltage components such as the H.V.Transformer, H.V.Capacitor, H.V.Diode, or Magnetron. * Open or loose wiring of the power relay. * Defective primary latch switch. * Defective power relay or Ass'y PCB. Adjust the door and latch switches. Check the high voltage components according to the component test procedure and replace them if defective. You may also need to replace the PCB main.
B
Brian PalmerAug 21, 2025
Why Samsung Microwave Oven does not accept key input?
- R
  Ricky LopezAug 21, 2025
  If your Samsung Microwave Oven does not accept key input (program), it could be due to: * Key input is not in sequence. * Open or loose connection of the membrane key pad to Ass'y PCB. * Shorted or open membrane panel. * Defective Ass'y PCB. Refer to the operation procedure. Replace the PCB main.
G
Gregory PerkinsAug 25, 2025
Why does Samsung MR7491G stop in the middle of cooking?
- P
  pmartinezAug 25, 2025
  If your Samsung Microwave Oven stops operating during cooking, it could be due to: * Open or loose wiring of the primary interlock switch. * Operation of thermal cutout (Magnetron). Adjust the door and latch switches.
M
Michael WestAug 26, 2025
Why Samsung MR7491G Microwave Oven can program but timer doesn't start?
- C
  chelsea53Aug 26, 2025
  If your Samsung Microwave Oven can be programmed, but the timer does not start, it could be due to: * Open or loose wiring of the secondary interlock switch * Off-alignment of the primary interlock * Defective secondary interlock S/W Adjust the door and interlock switches.
K
Kimberly HallAug 28, 2025
Why is the turntable motor not rotating in my Samsung MR7491G?
- D
  Deborah JohnsonAug 28, 2025
  If the turntable motor in your Samsung Microwave Oven does not rotate, it could be due to: * Open or loose wiring of the turntable motor. * Defective turntable motor. Check the wire of the turntable motor and replace the turntable motor if necessary.
B
Barbara SandersAug 30, 2025
Why is my Samsung MR7491G Microwave Oven sparking?
- J
  John PalmerAug 30, 2025
  If your Samsung Microwave Oven is sparking, it's likely due to metallic ware or cooking dishes touching the oven wall, or ceramic ware trimmed with gold or silver powder. Avoid using any type of cookware with metallic trimming.
A
Allison SnyderSep 1, 2025
How to fix uneven cooking in Samsung MR7491G Microwave Oven?
- S
  Susan GarciaSep 1, 2025
  If your Samsung Microwave Oven cooks food unevenly, it's due to the uneven intensity of the microwaves. Wrap thinner parts of the food with aluminum foil. Use plastic wrap or cover with a lid. Stir once or twice while cooking foods such as soup, cocoa, or milk.
M
Mallory FlowersSep 3, 2025
Why does Samsung MR7491G Microwave Oven take longer to cook?
- M
  Mario HudsonSep 4, 2025
  If your Samsung Microwave Oven has low microwave output, causing it to take longer to cook food, it could be due to: 1. A decrease in power source voltage. 2. An open or loose wiring of the magnetron filament circuit (intermittent oscillation). 3. Aging of the magnetron. Consult an electrician to check the power source voltage.
C
Chad CoxSep 6, 2025
What to do if Samsung MR7491G has no display and the fuse is blown?
- D
  David SantanaSep 6, 2025
  If your Samsung Microwave Oven has no display and no operation at all, and the fuse is blown, it could be due to: * Shorted lead wire harness * Defective primary latch switch * Defective monitor switch * Shorted HVCapacitor * Shorted HVTransformer Check the adjustment of the primary, interlock monitor, power relay, and door sensing switch.
B
Brett GonzalezSep 7, 2025
Why does the fan motor turn on when Samsung MR7491G Microwave Oven is plugged in?
- S
  sarah35Sep 7, 2025
  If your Samsung Microwave Oven's fan motor turns on when plugged in, it is likely due to loose wiring of the door sensing switch. Check the wire of the door sensing switch.

Samsung MR7491G Specifications

General

Turntable	Yes
Cooking Presets	Yes
Sensor Cooking	Yes
Child Lock	Yes
Defrost Function	Yes
Color	Black
Warranty	1 year

Summary

Microwave Safety Precautions

Servicing Safety Guidelines

Safety measures to prevent exposure to microwave energy during servicing.

Precaution

General Safety Precautions

Essential safety rules and procedures for technicians.

Special Servicing Precautions

High Voltage Precautions

Critical safety rules for handling high voltage circuits.

Specifications

Table of Specifications

Detailed technical specifications of the microwave oven.

Operating Instructions

Control Panel Overview

Explanation of the microwave oven's control panel buttons and functions.

Features and External Views

Identification of external features and physical layout of the oven.

Disassembly and Reassembly

Magnetron, Motor, and Lamp Replacement

Step-by-step guide for replacing key internal components.

High Voltage Transformer Replacement

Instructions for safely replacing the high voltage transformer.

Door Assembly Replacement

Removal of Door 'C'

Specific steps to remove Door "C" from the oven.

Removal of Door 'E'

Specific steps to remove Door "E" from the oven.

Removal of Key Door & Spring

Steps to remove the key door and spring mechanism.

Disassembly and Reassembly Procedures

Door Reassembly Test

Final checks and tests after door assembly reassembly.

Fuse Replacement

Procedure for replacing the main fuse in the microwave.

Drive Motor Replacement

Step-by-step guide to replace the drive motor.

Control Circuit Board Replacement

Control Box Assembly Removal

Steps to remove the control box assembly.

P.C.B Assembly Removal

Steps to remove the PCB assembly from the control box.

Window Display & Membrane Panel Removal

How to remove the window display and membrane panel.

Alignment and Adjustments

High Voltage Transformer Checks

Testing and checking the high voltage transformer.

Low Voltage Transformer Checks

Checking the low voltage transformer's resistance.

Magnetron Checks

Continuity checks for the magnetron.

Alignment and Adjustment Procedures

High Voltage Capacitor Checks

Procedure for checking the high voltage capacitor.

High Voltage Diode Tests

Steps to test the high voltage diode.

Relay Continuity Checks

Checking the continuity of main and power control relays.

Switch Adjustment

Adjusting critical safety switches for proper operation.

Magnetron Output and Heat Distribution

Magnetron Output Power Measurement

Method to measure magnetron output power via water test.

Heat Distribution Check

Checking heat distribution uniformity within the oven.

Microwave Leakage Measurement

Leakage Measurement Procedure

Detailed procedure for measuring microwave leakage.

Leakage Check Notes

Important notes and precautions for measurement accuracy.

Leakage Measuring Procedure and Record Keeping

Procedures for recording and notifying leakage test results.

Troubleshooting

Electrical Malfunction Causes and Corrections

Common electrical faults and their causes/corrections.

Troubleshooting Electrical Malfunctions

Continued Electrical Malfunctions

Further electrical malfunctions, causes, and corrections.

Exploded Views and Parts List

Exploded Views of Components

Visual representation of oven components with reference numbers.

Parts List - Main Components

Main Parts List Details

Detailed list of main parts with part numbers and specifications.

Parts List - Specific Assemblies

Door Parts List

Specific parts list for the oven door assembly.

Control Parts List

List of parts related to the control panel and electronics.

Body Latch Parts List

Parts list for the body latch mechanism.

Parts List - Standard and Installation

Standard Parts List (Screws)

List of standard screws and common hardware.

Installation Instructions

Instructions for installing specific trim and duct components.

PCB Diagrams

Main PCB Diagram

Schematic diagram of the main Printed Circuit Board (PCB).

PCB Parts List

PCB Component List

Detailed list of components on the PCB.

Schematic Diagrams

Overall Circuit Schematic

Overall schematic diagram of the microwave oven circuitry.

Related product manuals

Samsung MR7491G User Manual

Table of Contents

Questions and Answers:

Samsung MR7491G Specifications

Summary

Microwave Safety Precautions

Servicing Safety Guidelines

Precaution

General Safety Precautions

Special Servicing Precautions

High Voltage Precautions

Specifications

Table of Specifications

Operating Instructions

Control Panel Overview

Features and External Views

Disassembly and Reassembly

Magnetron, Motor, and Lamp Replacement

High Voltage Transformer Replacement

Door Assembly Replacement

Removal of Door 'C'

Removal of Door 'E'

Removal of Key Door & Spring

Disassembly and Reassembly Procedures

Door Reassembly Test

Fuse Replacement

Drive Motor Replacement

Control Circuit Board Replacement

Control Box Assembly Removal

P.C.B Assembly Removal

Window Display & Membrane Panel Removal

Alignment and Adjustments

High Voltage Transformer Checks

Low Voltage Transformer Checks

Magnetron Checks

Alignment and Adjustment Procedures

High Voltage Capacitor Checks

High Voltage Diode Tests

Relay Continuity Checks

Switch Adjustment

Magnetron Output and Heat Distribution

Magnetron Output Power Measurement

Heat Distribution Check

Microwave Leakage Measurement

Leakage Measurement Procedure

Leakage Check Notes

Leakage Measuring Procedure and Record Keeping

Troubleshooting

Electrical Malfunction Causes and Corrections

Troubleshooting Electrical Malfunctions

Continued Electrical Malfunctions

Exploded Views and Parts List

Exploded Views of Components

Parts List - Main Components

Main Parts List Details

Parts List - Specific Assemblies

Door Parts List

Control Parts List

Body Latch Parts List

Parts List - Standard and Installation

Standard Parts List (Screws)

Installation Instructions

PCB Diagrams

Main PCB Diagram

PCB Parts List

PCB Component List

Schematic Diagrams

Overall Circuit Schematic

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