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Repair guides and troubleshooting information for microwave ovens.

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Microwave sparking even with new waveguide. Any ideas on next steps

The microwave sparked so much and burnt the waveguide. I replaced the waveguide and I hear a click noise after few seconds and see spark/smoke again. Any thoughts on what I could check next? Thanks

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Hi @mc2pr,

What is the make and model number of the microwave oven?

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HV diodes like to spark and burn.

HV cap generally just smoke

HV transformer can spark and burn

Magnetron can spark and cause diode or transformer or capacitor to smoke.

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