I prefer not to make a diagnosis on a word description alone because I
have often been mistaken as to what the person was describing, and some
printing defects that look relatively similar can be of quite different
causes.
So, if you can send me by email a small scan of an area showing this
defect, I'd be happy to look at it and give you a diagnosis and some
suggestions what you can do about it.
If you can make a scan at 300 dpi (about 4 square inches or equivalent)
and jpeg it at high quality and send it as an attachment to the address
below, I'll let you know what I see.
Email me at:
e-printerhelp(at)mvps(dot)org
(at) = @
(dot) = .
If you don't have facility to scan the sample, email me anyway, and
we'll try to hash it out. I can send you some sample images and you can
tell me which it looks like.
Art