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Customer Questions and Answers for Magnetron Assembly by Ge

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Manufacturer Part
4.89 (64)
By: Ge
Part Number: OEM9555654
Manufacturer Part Number: WB27X10516

This magnetron assembly generates the microwave energy that heats food. Replace a weak or failed unit to restore proper cooking performance and resolve no-heat complaints when the microwave appears to run but no longer warms items. What it does:

  • Converts high-voltage power into microwave energy to heat food inside the oven cavity
  • Failure can cause: microwave runs but won't heat or takes much longer to heat
  • Often accompanied by a loud humming/buzzing during cook
  • May trip the internal fuse/breaker or shut off shortly after start
  • Visible damage to the magnetron antenna cap or signs of arcing near the waveguide can point to failure
What's included:
  • 1 magnetron assembly
Install notes:
  • Unplug the microwave and safely discharge the high-voltage capacitor before servicing
  • Remove the outer cover to access the magnetron; note wire locations and orientation
  • Transfer any required mounting hardware/shields from the old part; avoid touching or damaging the ceramic insulators or antenna cap
  • Reassemble completely and test heating with a cup of water—never operate the unit empty
Before you buy:
  • No-heat issues can also be caused by a failed high-voltage diode, capacitor, transformer, or door switches; diagnose where safe before replacing

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Questions & Answers

For Ge Magnetron Assembly (Part Number: OEM9555654)

1 Answer

Hello John, The unit will have to be opened and components tested to determine the cause of the failure. If there is a short it will have to be corrected before replacing the ceramic fuse since the fuse will just open again if power is applied with the short present. Please note that the tech sheet behind the control panel will have a flow chart for troubleshooting.

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1 Answer

Hello Alan, A low frequency growl is normally an indication of a failed high voltage transformer such as AP2026096. I cannot guarantee this is the correct part for you model since the model number posted is only a partial number. You can either re-post with the full model number or call us at 1-877-477-7278 anytime 24/7 with the full model number and one of our representatives will be happy to assist in locating any parts needed.

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1 Answer

Hello Bobby. You most likely have a "high voltage" side malfunction. Transformer, diode, magnetron, Capacitor. You will need to be extremely careful if you decide to test the components with a multi meter, Very high residual voltage is present, so make sure you remove power to the microwave and short across the terminals on the capacitor. The magnetron should have a reading of less than 1 ohm resistance across the two terminals, and an "open" circuit between each terminal and chassis ground. The diode/rectifier should have a resistance reading in one direction only, no resistance, or resistance in both directions indicate a faulty diode. The primary winding on the trans former should read approximately 450 Ohms resistance, the secondary winding should read 80 ohms resistance, and the filament transformer should read 100 ohms resistance. If all the readings are proper and in range, replace the magnetron.

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1 Answer

Hello Bud. See if the end is burnt out of the magnetron. If so, you need to replace it and the diode in the unit.

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1 Answer

Hello Greg, When there is a low frequency hum as you describe, the issue will be the high voltage transformer, the high voltage capacitor, or the high voltage diode. During a failure of this nature, the same over current flows through all three of these components so the manufacturer recommends replacing all three components. Just hope the magnetron hasn't been damaged also. If you remove the magnetron and look for discoloration at the tube end, as would be expected from situations of high heat, and the magnetron tube looks shiny and new, it will be fine. Otherwise, it too could require replacement to fully restore the unit to full power operation.

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1 Answer

Hello Sandra, The wattage of your oven should be on the serial tag or owners manual. The Magnetron should be a direct replacement to the one that came off unit and will continue to have the same wattage. Each unit has different wattage.

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