28 Mar
2006
28 Mar
'06
2:28 p.m.
Well, there is a square wave at CD1 of the unibus slots, as well as at CR1
of slot 1. My scope shows it at 180hz. I should have stayed with my simpler
Err.... It comes straight from the mains (well, the output of the mains
transformer). You are in the States, right? You are running off a normal
power outlet (and not, say, a private generating set)?
However, I don't see how this can be the cause of the problem. A 180Hz
signal would still trigger the DL11-W circuit. I doubt the machine would
get interrupt-bound either.
Do you have the DL11-W prints (e.g. in an 11/34 printset)? If so, I can
talk you through some simple tests on the board itself.
-tony