Question about Siemens HB77L65GB 900 Watts Convection / Microwave Oven

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Hello, I have a microwave Siemens HF 66051.The oven is working perfect,but the microwave doesn't.The fuses are well. Do you have any idea?

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It sounds like the magnetron may have either failed or is not being supplied with the extremely high voltage required to run it.

This is a job for a proffessional but if you are safety clued up, here's instruction.
Make sure the !!!!capacitor is discharged!!!!! before attempting any sort of repair.
Check the door interlock switches first then the high voltage diode with either an AVO model 8 or moving coil meter on high resistance range for short circuit, (DVM's won't show the fault!), the capacitor can fail and go short circuit, the feed fuse on the primary of the high voltage transformer and then finally, the magnetron is best checked by substitution.
Hope that helps.

Posted on Jan 03, 2011

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Posted on Jan 02, 2017

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If so, because of the voltages and currents involved, I do not recommend that someone without experience attempt repairs on an inverter circuit.

I would contact the manufacturer at the number in your owner's manual to find the nearest authorized servicer.

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