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If you were to take the turntable coaster out and wash it in hot washing up water paying attention to the wheel surfaces, I think that will fix your problem as I suspect the wheels are uneven with deposits stuck to at least one. Hope this helps.
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
My Belling BEL-CJ/SS25 Microwave / oven / grill has recently developed a problem. Every time I close the door the turntable starts rotating, even when I'm not using it. It doesn't make a noise, and doesn't seem to be going into any cooking setting, and the light doesn't come on, but it turns until I open the door, when the light comes on and the turntable stops turning. This has only recently started happening, and nothing else seems to be wrong with it, Is this safe or should I get rid of it and buy a new one. The guarantee has expired so repair may be cost prohibitive.
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.
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
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.
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