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Customer Questions and Answers for Magnetron by Ge

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Manufacturer Part
4.89 (64)
By: Ge
Part Number: OEM20666037
Manufacturer Part Number: WB26X32629

The Magnetron is an OEM component specifically designed for GE microwaves. The magnetron is responsible for generating microwave radiation that cooks food by utilizing electromagnetic energy. It works by accelerating electrons within a vacuum tube using a magnet to generate microwave emissions. 

Causes of a bad magnetron can include overuse, excessive cooking times, damage from arcing due to sparks, or general wear and tear over time. 

Symptoms of a bad magnetron include:

  • Inefficient or inconsistent cooking and heating 
  • Longer cook times required 
  • Food not cooking thoroughly or remaining cold in spots
  • The microwave making buzzing or humming noises during use

This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.

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Questions & Answers

For Ge Magnetron (Part Number: OEM20666037)

Mike for Model Number PSB1001NSS

GE Advantium PSB1001NSS Microwave makes a pop noise and no longer heats. With the cover off, when the microwave is started, there is an arc (pop) between the low voltage heating circuit wire and the top of the transformer. This is connected to the same post on the Magnetron as the lead from the capacitor. All the diagrams I found refer to it as F. I cannot figure out where the issue is. I hate throwing parts at a problem. Can you provide any guidance? The 20 amp fuse it good. The door interlock and monitor switches all work properly. The Diode when connected to a 9volt battery it shows 5.75 v the correct direction and hooked up backwards 20 mv. I suspect that is ok. The following all sound correct based upon specs I've found. using a multimeter: The primary circuit on the transformer =.5 ohms Red lead from the transformer to capacitor measures 90ohms to ground. Documentation states 87. Is 3 ohms significant? No leads from the transformer are improperly shorted to ground. Neither post on the capacitor or magnetron are shorted to ground. If I measure the ohm resistance between the posts on the capacitor it does show 11 m ohms. I'm assuming it related to the internal resistor. If I check for continuity between the posts on the capacitor it shows 0. Resistance between the posts on the the magnetron measure .2 ohms consistent with the documentation Thank you

1 Answer

Mike, Based on the information provided it sounds like an issue with the diode and magnetron.

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1 Answer

Fre, based on the information provided, the main control WB27X10966 would be the likely cause of failure if there are no broken wires and the turntable motor does not receive 120VAC during operation when testing from wire to wire.

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1 Answer

DB, Thanks for the question!!! It could be the Magnatron or it could be the Turn Table Motor WB26X10193. In either case, if you aren't bothered by the noise you don't need to fix it until it fails completely.

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1 Answer

Hello Randy, unplug the power to the microwave, unmount the microwave, remove outer case, discharge the high voltage capacitor, using a multimeter check the operation of the primary door (upper) switch.

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1 Answer

Ted, the magnetron WB27X10309 (magnetron has been discontinued by the manufacturer) tube and the waveguide (not a replaceable part) where it is inserted will need to be inspected for damage. Bare metal spots in the microwave can cause sparks (as well as food residue), however, if the magnetron tube is damaged it can spark. If the waveguide is damaged, it can cause sparks as well, but can not be repaired.

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1 Answer

Bill, You will want to check the thermostats and fuse inside the unit as these will be the most likely cause for the unit to not operate.

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1 Answer

Bob, the noise and burning may be coming from the magnetron section. You will want to disassemble the microwave to verify that the magnetron is the cause of the issue by carefully removing the magnetron and inspecting the filament. You will also want to inspect throughout the cavity where the magnetron sets to make sure that this area has not been damaged.

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1 Answer

Wesley, You will want to check the door switches to make sure that they are good. if they check ok this could possibly be a capacitor that has failed or a high voltage transformer.

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1 Answer

Hello Jerry, the magnetron is located in the cavity behind the control panel. You'll have to remove the screws that hold on the outer casing to gain access to the magnetron. Thanks!

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