Question about Panasonic NN-C980 Convection/Microwave Oven

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Panasonic NN-C980B stopped working. Blown fuse.

Panasonic NN-C980B stopped working. Opened top panel and discovered the 18A special fuse was blown. I replaced the fuse and tried it again, but it blew the fuse again. What are the possible causes?

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Sometimes when the mag shorts it takes out the inverter. I would measure the mag leads to ground and they should be open or 20M or so. If you have both a mag and inverter bad it's probably time for a new oven.

Posted on Jun 02, 2010

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Posted on Jan 02, 2017

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I opened it from the right side where electric circuit is just behind the front panel, and found a blown 18A fuse, replaced it with same exact fuse and still keep blowing fuses.


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

YOUR SAFETY IS PARAMOUNT

This is a job for a professional but if you are safety clued up, here's instruction.

If it is the type with an "Invertor", they are not user serviceable and must be repaired by an authorised Panasonic agent for continued safety, otherwise if conventional;
Make sure the !!!!any capacitors are 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.

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Most likely have blown a fuse , get behind the touchpad to ohm the fuse out , replace if blown , if continues to blow check componets for shorts , there will likely be signs of burnt parts.
Phil

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Service manual can be got here... http://www.free-service-manuals.com/Kitchen_Appliances/Microwave_Ovens/Panasonic/Panasonic_NN-P294_Service_Manual_-_Simplified_L29796

There is a small ceramic 18A fuse located on the circuit board behind touch pad. You have to remove the top and wrap around panel to get at it. Had same problem, my fuse was ok though. My problem seems maybe in dor switches. http://www.fixya.com/support/t610587-nnp_294_dead

Hope yours is just a fuse. Good luck!

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