Model JVM1640CJ03 Why is my turntable making a thumping sound? There is no sound when turntable is off.

Is your glass turntable sitting on the rotator correctly? If it is even slightly misaligned it will make terrible noise.

see for the turn table obstacle of any screw or something else.

The turntable system consists of the motor, the coupler, the turntable support with rollers, and the tray.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand.

If yours is not set to be off via the control panel, and it won't rotate or it sounds like it's grinding, etc., you may have a bad motor or plastic coupler.

To replace either, you need to unplug power, then remove the bottom cover of the oven.

On some, you have to cut the motor cover off with snips, then use a screw when reassembling it.


You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

If it stops heating and the other parts of the oven still work, the problem is with the magnetron circuit. If it makes a loud buzzing noise when you try to heat the food, then the magnetron has shorted out. The replacement cost for the magnetron is almost as much as a new oven, so it does not make sense to have it fixed. Sorry.

This is a long shot ... is there possibly a piece of dirt on one of the wheels?

depends on make and model could be a capacitor issue or a control panel issue

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

Once i opened up the microwave, I found that some kind of capacitor or something (had two wires going to it) had fell down on top of the fan. I had to rig the plastic mounting bracket and re-attach it to a panel inside. That took care of the rubbing noise. It turned out that some one had unplugged the wire that powered the turntable. That took care of that. it seems to work fine now. Steve

The turntable system consists of the motor, the coupler, the turntable support with rollers, and the tray.

You can see and hear a video of how a turntable motor should sound when you rotate it by hand.

You may have a bad motor orplastic coupler.

You can usually find exploded views and order parts by entering your model number at the Sears parts site.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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.

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