I just sent a request for info about 8830s giving grief, and I remembered
an odd ball situation that occurred with the first 8830
install in Winnipeg.

I did my tricks, and it was making **perfect** prints ( IMHO ).
The IT guy at my customer noticed that there were many flaws
in virtually every print! Pull my hair out time!

We would run a print with narrow vertical and horizontal
lines, all with the same pen settings.

The IT guy showed my branch manager, sales man and me that the horizontal ( 90 degrees to paper travel ) were a little fatter than
than the lines in the direction of paper travel.

So they ( I kept out of thye way ) examined these lines
going so far as to measure their widths.

Lots of head scratching and chin stroking. I have to admit that the IT
guy's description was perfectly correct. As for an answer........
I had not one.

The manager and sales guy took a bunch of prints that showed these
symptoms back to the office so that we/he could call our Xerox
rep and describe the apparent problem. XEROX rep had not
encountered any such problem ( and I believed him ). I think that
we got to talk to a XEROX engineer, who also had never had
this problem.
We sent off the sample prints to every body at XEROX who might have
an answer! Lots of conference calls, but no answer.
We were reluctantly prepared to pull the machine, but before that happened The XEROX pundits explained why the horizontal
lines were a little bit "fatter" than the vertical ones.
Before fusing all the lines appeared to be of the same width.

Apparently when fusing was taking place the horizontal lines were
being squeezed and flattened and becoming fatter.

Of course the techie guy spent time on the machine doing
what the XEROX engineers suggested. They did not have
much hope of solving this problem, as their test machines
did the same thing to the lines as ours did.

At the end of these trials the manager, the sales rep. and I
went over to the customer site, prepared to pull
the machine, not just like for like it, as there was NO answer
to this quirk!

I wasn't present when they had their "final" meeting, but the
customer said that they would indeed keep this machine with
its flaw!

I do not know to this day whether the IT guy was pulling our legs.

They kept the machine and worked it to death.
They then purchased ( after some years of reliable effort)
a XEROX machine that was faster, better more expensive and
best of all, I was not trained on it.

They and we have had 14 years good relations