Question about Sharp Microwave Ovens

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Microoven R-314FS is buzzing when started. What is supposed to be the voltate rating on the wave generator RV-MZA308? I am reading only 2.5 V before and after capacitor. Presume the wave generator is High voltage and the transformer failed. Where can I get a replacement for it? - 25S22TT3, 120 V, 60 HZ "Zebra" TAR220ATT, ATRN-A664WRZZ. Sincerely Yan Pawlak

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  • pawlakjs Mar 08, 2009

    Thank you very much. your instructions were helpful.

    At least I know that the microwave oven is a total loss.

    The magnetron resistance is 80 Ohms; The transformer's HV red (center) wire to ground resistance read 100 Ohms and both end (white) wires to ground is Infinity (open).

    I couldn't find any replacements at "encompass" web page, you recommended, but it wont be cheaper than a new oven anyway.

    Sincerely

    Yan pawlak

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  • Sharp Master
  • 9,047 Answers

It's likely a shorted high voltage rectifier diode.

That transformer would be # RTRN-A664WRZZ

You can get Sharp parts from Encompass . Or you can call them toll-free at 866-779-5835.

Before you order parts, I would suggest checking them according to these instructions, but read the safety warnings first:

http://www.gallawa.com/microtech/cap_test.html

http://www.gallawa.com/microtech/diode.html
(if it is NOT shorted or burned looking, it's probably fine)


http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though mag is bad!)


http://www.gallawa.com/microtech/xformer.html

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Mar 06, 2009

  • William Miller
    William Miller Mar 10, 2009


    Not sure what you mean.

    The transformer # RTRN-A664WRZZ can be had in about 6 days, according to the Encompass site...

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