18 Sep
2004
18 Sep
'04
4:40 p.m.
Hello all,
I recently became the new owner of a Tek 321A scope, but it needs some
repairs. Also, I have no manuals, so if anyone could loan me an operator's
manual or service manual so I could make a copy, I'd appreciate it....
The main issue is the display. There is what I can only describe as a
"cloud" that runs vertically along the center of the display. Varying the
intensity and focus does vary this cloud, but it is still present. Also,
the trace line is visible, but very out of focus. Wider at the edges, and
narrower in the middle. I can take a picture if this makes no sense...
Well, it _could_ be the CRT (displaced electrodes or interelectrode
shorts) :-(, but I'd start by checking CRT electrode voltages. On some
Teks there are various geometery/sheild electrodes, and it may be that
you've lost the voltage on one of them.
-tony