Question about GE Spacemaker JVM1640SJ Microwave Oven

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It makes a dull thumping sound while the oven is operating

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Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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MicrowaveSvc
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SOURCE: GE SPACEMAKER MICROWAVE OVEN

Is it a rhythmic thumping, or intermittent, or one thump when it first starts?

If it's rhythmic, it may be a failing turntable motor or stirrer.

If it's a thump just when you hit Start or when the magnetron turns on at the beginning of the cook cycle, it may just be a common noise that they sometimes make due to the magnetic field produced by the high voltage transformer.

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Dec 07, 2007

  • 1 Answer

SOURCE: Microwave making dull thumping noise when NOT in use

I called a technician out today. Seems like the problem is the circuit board. It wasn't working properly and the sound is the fan. The fan is supposed to turn on when the microwave is in use and off when it is not. In this case, the fan continued even when the microwave was not in operation. A new circuit board has been ordered and will replace the old one when it arrives. For now, I can still use the microwave, but I have to unplug it everytime I finish heating something up. A little inconvenient, but at least it'll still heat my food up in the meantime.

Posted on Jun 26, 2009

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1 Answer

We have a very old panasonic microwave that makes single bang sound when it is started. is it safe to operate?


When the high voltage microwave is energized, its magnetic field pulls the right side of the oven cover inward.

When the oven is manufactured, and rubber bumper is glued to the transformer.

Over the years the glue can break loose, allowing the thump to recur.

It's safe, just a little startling.

Push your hand against the right side as you start it and see if that muffles it.

If so, that's what's happening.

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Microwave makes a thumping sound then no heat


sounds like the hi voltage diode or capacitor are intermittant, the thump is the transformer drawing current when the magnetron tube calls for hi voltage to operate, you will see the lights dim slightly every time it cycles the mag tube for heat

Oct 07, 2009 | KitchenAid KHMS155LSS 1000 Watts Microwave...

1 Answer

Microwave making dull thumping noise when NOT in use


I called a technician out today. Seems like the problem is the circuit board. It wasn't working properly and the sound is the fan. The fan is supposed to turn on when the microwave is in use and off when it is not. In this case, the fan continued even when the microwave was not in operation. A new circuit board has been ordered and will replace the old one when it arrives. For now, I can still use the microwave, but I have to unplug it everytime I finish heating something up. A little inconvenient, but at least it'll still heat my food up in the meantime.

Jun 24, 2009 | GE JVM2070 Microwave Oven

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I have an Emerson (2 weeks old). It heats well but there is a thumping noise when the table rotates and sometimes the table will operate with a jerking motion.


It sounds like the table is'nt positioned properly on the base it sits on, most are not attached and can be easily removed for cleaning purposes, try repositioning the table on the base.

Mar 10, 2009 | Microwave Ovens

1 Answer

Thumping noise in microwave


the glass turn table is probably not lined up.

Sep 17, 2008 | Microwave Ovens

1 Answer

GE SPACEMAKER MICROWAVE OVEN


Is it a rhythmic thumping, or intermittent, or one thump when it first starts?

If it's rhythmic, it may be a failing turntable motor or stirrer.

If it's a thump just when you hit Start or when the magnetron turns on at the beginning of the cook cycle, it may just be a common noise that they sometimes make due to the magnetic field produced by the high voltage transformer.

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

Dec 06, 2007 | Microwave Ovens

2 Answers

Model JVM1640CJ03


If the turntable tray is positioned and seated properly, it is probably a failing turntable motor. You can find usually helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383 If you or a friend decide to work on it, we have *critical* safety and disassembly info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

Mar 09, 2007 | GE JVM1640 Microwave Oven

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