Mr. Plow,

The source for my experimentation is a household circuit with hardly
anything else plugged into it. It looks good on the meter.

"Meat Plow" wrote in message
news
On Tue, 03 Apr 2007 18:26:33 -0400, Silver Surfer wrote:

I've looked at just about every conceivable location inside and outside
the
cabinet but have not located a schematic.

It's my daughter's microwave. Complaint was that it keeps shutting down
shortly after starting to heat something. Problem has been around awhile
but kept getting progressively worse until now it's just about useless to
cook something.

Brought it home with me. Tried it out. Worked perfectly quite a number
of
times. Took it apart just to look for something that could be causing an
intermittent. Found nothing. Put it back together. Oops. Problem back
with a vengeance.

Tore it apart again. Checked lots of connections and TCOs with my
ohmmeter.
Examined circuit board with a high intensity light and a magnifying
glass.
Nothing turned up.

Unplugged the HV transformer primary and put it through its paces.
Everything worked flawlessly(except the heat of course).

Connected the HV transformer again. Voila. It's working normally again!
My concern is that it will go back into the failure mode sooner or later,
because no smoking gun has shown up.

When it was acting up it made me suspect that the board was losing power
because when it shut off the digital display required me to enter the
time
and date just like it does after it's unplugged.

An aside to Mr. Goldwasser:

Your excellent article on microwave repair has been an enormous help to
me.
Thanks for sharing your extensive knowledge with the rest of us.

How is the source voltage?
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