A few months ago I bought a new Westinghouse WST3501 microwave oven for
our office "eating area".
The oven itself works fine, but we're annoyed by the time of day clock
losing a couple of minutes a day and having to be reset to the correct
time every few days.
I've never seen this happen on several other microwave ovens I've had in
the office or at home, it's like the clock in this one isn't
synchronized to the 60 Hz line. Other line voltage operated clocks in
our office keep the correct time, unless there's a power failure and
they don't have a battery backup in them.
I'm guessing that the electronics in this "made in China" oven were
designed to run on 50 or 60 Hz power, with just a different power
transformer installed in 230 volt models. And, the clock is timed from a
poorly tuned and/or temperature sensitive crystal oscillator, not the
I e-mailed Westinghouse about this but they put me off to "Fox
International" who thusfar hasn't answered my e-mail about it.
Not an earth shaking problem by any means, but my curious mind wants to
know what's really going on with the clock function in that oven.
I'd just as soon put a pice of tape over the readout and fughedit, but I
can't do that because it's needed for the cooking functions too.<G>.
(W1BSV + Brass Rat '57 EE)
Click to see the full signature.