That says that you have a problem with either the thermistor board (your
previous email indicted thatyou did not), or in the path from the U6 pin 1
output to the varistors. Check the soldering on R19 and those components
that are near it (check the schematic to find the other connected
components
Mike,
I'm sure Don and Ken are steering you right. Visual inspection of the
thermistor board may not be enough. I had a problem there myself, signed off
on it as good several times and went looking elsewhere for the problem.
Finnally, after quit a bit of disassembly, I reflowed what looked
I had not soldered the common junction of two resistors ... (:-))
73! Ken Kopp - K0PP
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Mike,
You most likely do have a thermistor board problem - a short from pin 2(and
3) to ground (pins 4 and 5) could cause the situation you describe - in that
case, the op amp would be producing full output with any voltage input above
zero volts.
73,
Don W3FPR
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