I wasn't
sure about the 5v; I took a reading across each of the 8132 ch=
ips,
getting 4.14v and 4.16v; but I guess those may
not be meaningful as the
chip itself will be taking some of that power.
8132 chips?
That's *definitely* too low, if it's supposed to be +5V. Enough to caus=
e the=20
logic to act quite strangely...
Assuming this was measured across the power pins, and not some logic
signals...
What worries me more is that the PSU output is on the high side, but the
voltage across a logic chip is low. That measns that extra voltage has
been dropped somehwere, presumably across a high-impednace PCB trace,
connector, or whatever. And that's going to cause all sorts of problems
when you hcae switching transients to contend with.
-tony