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PANASONIC M/WAVE/CONVECTION OVEN. MODEL NUMBER NN-9853. SERIAL NUMBER 5835230320. Number on green side of circuit board (A62606661QP.) Number on brown side of circuit board MS-666. Zeno diode 1 is broken. What are its technical specifications to enable me to identify a replacement part? Cheers Hugh Gibbon

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  • hegibbon Oct 09, 2010

    I took the panel

  • hegibbon Oct 21, 2010

    I took the panel & the fractured part to Jaycar at Fyshwick this morning but they were unable to identify which of the multiplicity of zener diodes was appropriate for this application. They advised me to get the specification so they could supply the correct part.

    I took the panel & the fractured part to Jaycar at Fyshwick this morning but they were unable to identify which of the multiplicity of zener diodes was appropriate for this application. They advised me to get the specification so they could supply the correct part.


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I tried my usual "trusty" sites to find a schematic, but to no avail. I read that Panasonic has discontinued support for these, so they're not likely to be of any help unless they could be so kind as to run down the zener for you. Here's what I would do, since you're kind of stuck right now. I would get a 5 v zener of about the same physical size and structure (for current handling capabilities), and try it. If that doesn't produce results, try a 12 volt zener, and see. Most zeners are in those ranges for digital, and if you start off with the lower voltage, you should be able to test out a couple, and hopefully get it going.
Chances are the zener's just stabilizing a 5 volt feed supply, and that would be a good place to start.
Have you tried to get the number from Panasonic's support site online? If you could get a line on their repair center, they would have the schematics and parts lists, and that's what we really need.
The whole problem with this kind of issue, as you may know, is that companies, in general, don't really want you to be able to fix their items on the parts level, and so they make you replace the whole board.
There a site that usually has diagrams, and sometimes schematics, but your model number didn't come up. If you can get a model number close to yours, chances are the zener will be the same. Here's the site:
That's the most likely site to get any help from, and good luck. Here's a link where you can enter a specific question, and hopefully get an answer:
Panasonic will have the parts lists, if anyone does, but if they've discontinued support, only facilities that serviced them over the years will still have them. You might try taking a shot at calling around to some repair shops- sometimes you'll find a fellow that will know what you're talking about, and can help.
Good luck, and hope this helps.

Posted on Oct 09, 2010

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Since you have been able to identify it is the zener diode that is broken, tou can take the panel to any electronic shop to get a replacement zener diode for it.

Take care.

Posted on Oct 09, 2010

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