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Forum: Troubleshooting Appliances and other Household Electronic Stuff

03-06-2022, 08:50 PM

Replies: 23

Sharp R-990K Microwave started making rapid clicking sound and smoke

Views: 2,417

Posted By redwire

Re: Microwave started making rapid clicking sound and smoke

Relays typically must operate given 70-75% of their rated coil voltage, so 13.5V minimum spec. If you hear it click with 12VDC, that's good enough, we just want to see if the contacts are pooched and...

Forum: Troubleshooting Appliances and other Household Electronic Stuff

03-06-2022, 02:25 PM

Replies: 23

Sharp R-990K Microwave started making rapid clicking sound and smoke

Views: 2,417

Posted By redwire

Re: Microwave started making rapid clicking sound and smoke

A bad relay (contacts) can make arcing sounds and smoke.

You could bench test them, apply 18VDC to the coil and see if the contacts close. But ohmmeter readings are not reliable here because of...

Forum: Troubleshooting Appliances and other Household Electronic Stuff

03-06-2022, 12:04 PM

Replies: 23

Sharp R-990K Microwave started making rapid clicking sound and smoke

Views: 2,417

Posted By redwire

Re: Microwave started making rapid clicking sound and smoke

Awww we got dumped, OP where's the commitment? https://www.eevblog.com/forum/repair/trying-to-repair-microwave-after-some-assistance/

I haven't seen any evidence of water damage so far, so 'fess...

Forum: Troubleshooting Appliances and other Household Electronic Stuff

03-04-2022, 05:13 PM

Replies: 23

Sharp R-990K Microwave started making rapid clicking sound and smoke

Views: 2,417

Posted By redwire

Re: Microwave started making rapid clicking sound and smoke

What make and model is this?
ZD2 and the fusible resistor next to it, looks like normal soot buildup from parts running years 24/7 with heat, you can see convection currents form deposits.
I'd keep...

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