It could be that the inner oven temperature regulation is off a bit, or
even failed. There was a report at one of the popular time-nuts oriented
websites (I forget which one, but it's the one that had extensive
coverage of the Z3801A) about inner oven problems a few years ago. I
took mine apart and found that it had an IC of a particular date code
range that was prone to failure. I can't recall whether I replaced it
with the same type but different date, or an alternative, but it worked
just fine after that, with no tweaking of coarse EFC needed.
The IC was a dual opamp I think, that controlled the oven temperature
according to the thermistor signal, and drove the heater transistor(s).
It was a fairly high performance type, but not that unusual. I think it
was a Linear Technology brand part.
Ed
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
