tempus fugit wrote:

Once again, thanks for your reply.

I have no idea how long it has been dead. My brother in law got it for
free (!) at a garage sale this summer, and was told that it was working.

I was messing around with it again tonite, and I noticed a gross error.
Remember I said I pulled a 4066 out because the voltage readings were way
off from the schem? Well, it wasn't a 4066, it was a 4016,

Pretty near the same part (different spec for "on" resistance is most of it
as I recall).

and (this is the embarrassing part) I had put it in backwards when I
reinstalled it.

Ouch. I hate it when that happens... :-)

Anyway, the good news is that (now that it is in the right way)

It still not be any good, though. Reverse power to a CMOS part like that
can result in fairly high current, since the power pins are then looking
at what amounts to a forward-biased diode. That thing may be cooked. But
they're cheap.

the opamps are running at a normal temperature (slightly warm). I'm
wondering though, if that part isn't screwed (the 4016) because when I say
the voltages are off, I mean the wrong polarity as well as the wrong
voltage. Maybe I'll pop a new one in and see what happens.

There ya go.

Here's another thought: this thing was designed in the 70's, so maybe the
CPU has a Y2K problem. I found a site that mentioned that the time was an
issue because of this for this unit, but it didn't describe the symptoms
I've got.

What would that thing do with a date?