When you've got it powered up again, you should try adjusting the
trimpot. You should be able to find a spot that gives you a frequency
minimum, assuming this is an AT crystal. This will minimize sensitivity
to temperature change. There's a slim chance that a shift in the
temperature set point could be at the core of your problem, but it would
be a rather extreme case.
Ed
On 5/12/2013 9:36 AM, Frederick Bray wrote:
Well, I decided to make the "Y" incision and pulled the circuit board
out of the oven. (Photos later after I crop them.)
Yes, the trimpot is part of the circuit associated with the thermistor.
My plan is to check the resistors (surprisingly most are carbon film
except those in the thermistor circuit), look at the circuit board
under a magnifier, and stick it back in the foam for testing after
making any repairs.
Thanks again for the continuing comments and advice.
Fred
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