Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!rutgers!bellcore!att!cbnewsl!floyd!fjs
From: fjs@floyd.ATT.COM (Fred Shubert ,2A-154,3094,ATTBL)
Newsgroups: sci.electronics
Subject: Re: Microwave Oven Repair
Summary: how about a fried transformer/how to check the tube??
Message-ID: <1929@cbnewsl.ATT.COM>
Date: 19 Sep 89 17:18:35 GMT
References: <10931@fluke.COM> <460@ctycal.UUCP>
Sender: nntp@cbnewsl.ATT.COM
Reply-To: fjs@floyd.ATT.COM
Organization: AT&T Bell Laboratories
Lines: 43

In article <460@ctycal.UUCP>, ingoldsb@ctycal.COM (Terry Ingoldsby) writes:
> In article <10931@fluke.COM>, inc@tc.fluke.COM (Gary Benson) writes:
> > Last night my 4-year old Tappan microwave oven chattered, buzzed, and died
> > in the middle of baking some potatoes. Removing it from the counter, I heard


I got a 2 year old Sharp Carousel II Nuker and unfortunately one night
I had the same problem, but not with taters :-)  Anyhoo, the mild stench
of burning wire insulation prompted me to remove the oven cover.  Lo and
behold, the secondary on the xformer was toasted (black scortch mark, lots
of carbon, and bubbled metal).  More than likely happened because the nuker
has been in a sorta-closed area (improper ventilation).

My questions:  
 1)  I know that the tube is isolated via the xformer, but how can I check 
it (resistance measurement??) just to be sure no damage occurred???????

 2)  My nuker has one large diode/resistor assembly (packaged-sealed) 
that is connected between gnd and the .8uF bypass cap (LARGE!!).
Its resistance is approx. 15M ohms.  Does this sound right??

I'm picking up a new xformer tonight and will try it.  My hopes are
not of the highest altitude, so hopefully someone has some suggestions
for me to read come the morning.

Cost for the xformer:  $60.00
If I gotta get a tube, I might as well build a nuker!!
(How much do tubes cost??)

Much thanks.

Fred J. Shubert         | "You haven't lived until you've seen a 'cat fly!!!"
AT&T Bell Labs          |-----------------------------------------------------
Whippany, N.J.          | DISCLAIMER:  All views are that of my own. PERIOD.
Ma-Bell 201-386-3094    |              Who else could be so 'cat crazy!!

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