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Samsung M308R - User Manual

Samsung M308R
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MICROWAVE OVEN
M308R (MELON / GRAY / YELLOW)
SERVICE
Manual
MICROWAVE OVEN CONTENTS
1. Precaution
2. Specifications
3. Operating Instructions
4. Disassembly and Reassembly
5. Alignment and Adjustments
6. Troubleshooting
7. Exploded Views and Parts List
8. PCB Diagrams
9. Schematic Diagrams

Questions and Answers

  • K
    Kristin HayesAug 18, 2025
    Why Samsung M308R can program but timer does not start?
    • T
      tpattonAug 18, 2025
      If your Samsung Microwave Oven can be programmed but the timer doesn't start, the issue might be due to an open or loose wiring of the secondary interlock switch, off-alignment of the primary interlock, or a defective secondary interlock S/W. Try adjusting the door and interlock switches.
  • G
    Gregory CollinsAug 21, 2025
    How to fix uneven cooking in Samsung M308R Microwave Oven?
    • R
      Rebekah BaileyAug 21, 2025
      If your Samsung Microwave Oven isn't cooking food evenly, it's often due to the inherent characteristics of microwave intensity. To mitigate this, wrap thinner parts of the food with aluminum foil. Also, use plastic wrap or cover the food with a lid. For foods like soup, cocoa, or milk, stir once or twice during cooking.
  • J
    Joshua WillisAug 25, 2025
    What to do if Samsung M308R Microwave Oven does not accept key input?
    • G
      Garrett CobbAug 26, 2025
      If your Samsung Microwave Oven does not accept key input (program), it could be due to several reasons. The key input might not be in sequence. There could be an open or loose connection of the tact switch to the Ass'y PCB, a shorted or open tact switch, or a defective Ass'y PCB. Refer to the operation procedure. Replace the PCB main.
  • P
    Patricia CookAug 28, 2025
    Why is my Samsung M308R sparking?
    • R
      Regina LambertAug 28, 2025
      If your Samsung Microwave Oven is sparking, it's likely due to metallic ware or cooking dishes touching the oven wall. Ceramic ware trimmed with gold or silver powder can also cause sparks. Do not use any type of cookware with metallic trimming.
  • C
    Christopher CarterAug 31, 2025
    Why Samsung M308R makes loud buzzing noise?
    • D
      Donald NguyenAug 31, 2025
      If your Samsung Microwave Oven is making a loud buzzing noise, there are several potential causes. First, check if the fan and fan motor are loose. Second, inspect the screws on the H.V. Transformer to ensure they are tight. Finally, a shorted H.V. Diode could be the culprit. Tighten the screws of the fan motor and H.V. Transformer. If the H.V. Diode is shorted, replace it.
  • C
    craig60Sep 3, 2025
    What to do if Samsung Microwave Oven stops during cooking?
    • C
      Christopher WalshSep 4, 2025
      If your Samsung Microwave Oven stops operating during cooking, it could be due to a few reasons. Check for open or loose wiring of the primary interlock switch. Another possibility is the operation of the thermal cutout in the cavity. You may need to adjust the door and latch switches.
  • M
    Mark SteeleSep 7, 2025
    Why Samsung M308R Microwave Oven fan motor turns on when plugged in?
    • C
      Christine KimSep 7, 2025
      If the fan motor in your Samsung Microwave Oven turns on as soon as it's plugged in, the cause is likely a loose wiring of the door sensing switch. Check the wire of the door sensing switch.
  • J
    Jennifer ClarkSep 12, 2025
    Why Samsung M308R Microwave Oven takes longer to cook food?
    • A
      Amanda MarshallSep 12, 2025
      If the microwave output of your Samsung Microwave Oven is low, causing food to take longer to cook, there are a few potential causes. First, check for a decrease in the power source voltage. Second, inspect the magnetron filament circuit for open or loose wiring, which can cause intermittent oscillation. Lastly, the magnetron itself may be aging. Consult an electrician.
  • W
    William MillerNov 13, 2025
    What to do if the Samsung M308R Microwave Oven timer starts but there is no heat?
    • B
      Billy GomezNov 13, 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 are working), the issue could stem from several causes. First, check the alignment of the latch switches. Second, inspect the high voltage circuit, especially the magnetron filament circuit, for any loose or open connections; high contact resistance can lower the magnetron filament voltage, leading to reduced output or intermittent oscillation. Third, examine the high voltage components like the H.V. Transformer, H.V. Capacitor, H.V. Diode, H.V. Fuse, and Magnetron for defects. Also, check for open or loose wiring in the power relay. Finally, a defective primary latch switch, power relay, or Ass'y PCB could be the cause. Adjust the door and latch switches...

Summary

Precaution

Safety Precautions for Microwave Energy Exposure

Extensive warnings and guidelines to prevent exposure to microwave radiation during servicing.

1-1 Safety precautions

Specific safety measures for servicing microwave ovens to prevent radiation exposure and high voltage hazards.

Specifications

2-1 Table of Specifications

Lists technical specifications including timer, power source, output power, and dimensions.

Disassembly and Reassembly

4-1 Replacement of Magnetron, Motor Assembly and Lamp

Provides step-by-step instructions for replacing specific internal components like magnetron and fan motor.

Alignment and Adjustments

5-8 Output Power of Magnetron

Describes the water temperature rise test procedure to measure magnetron output power.

5-9 Procedure for Measurement of Microwave Energy Leakage

Outlines the procedure for measuring microwave energy leakage using a survey meter.

5-10 Check for Microwave Leakage

Steps for checking microwave leakage, including probe placement and measurement limits.

Troubleshooting

6-1 Electrical Malfunction

Provides a table of electrical symptoms, causes, and corrections for common issues.

6-2 Electrical Malfunction(continued)

Continues the troubleshooting table for electrical malfunctions and other issues.

P.C.B Diagrams

Schematic Diagrams

Samsung M308R Specifications

General IconGeneral
InstallationFreestanding
Turntable Diameter288 mm
Cavity MaterialEnamel
Weight12.5 kg
ColorBlack
Door Opening TypeHandle
Capacity20 liters
Power Output700W
Power SourceAC 230V, 50Hz
Safety FeaturesChild Safety Lock

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