Digital BW, The Print

Steve -

I haven't unpacked my C86 yet, so I'm going to make an assumption 
from when I see this happen on my 890s.  This vertical banding is 
caused (in my case) by "head chatter" as the head starts across the 
page.  The problem is solved by applying lube grease, not on the 
round shiny bar the head runs on, but to the vertical metal plate 
that runs the width of the printer and parallel to the round bar and 
that the head carriage draps over.  There are two plastic nubs (part 
of the head carriage) on either side of the metal plate that rub 
against this vertical metal plate .  Kind of hard to describe without 
pictures and arrows, but maybe you may get the idea. This plate gets 
coated with ink film (as does the round bar) and that causes drag on 
the head motion until after it has moved the first several inches. 
Now, this is a very difficult location to lube properly unless you 
remove the top of the case.  I ended up slicing off a 2" section of 
the plastic case (across the width) to have better access to this 
location without having to remove the top of the cover every time - 
which also requires removing the CIS.  PITA.



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Steve Taylor" 
<ts01@b...> wrote:
> 
> Anyone seen this before?
> 
> I am using EZN in a C86 and am getting VERTICAL banding i.e. 
parallel
> to the paper movement through the printer. It only occurs in once
> place, and that is about 2 inches from the edge of the page on the
> side where the head parks. The affected area is about half an inch
> wide, and appears to be symmetrical. The bands are small variations 
in
> density (but clearly visible, enough to ruin pictures) and run the
> whole height of the paper (when printed in portrait). It does not in
> any way look like the banding you get from missing nozzles (my
> vertical bands are fuzzy), and I am pretty convinced that the 
nozzles
> are OK. 
> 
> I have tested this by printing out the purge patterns for each of 
CMYK
> so as to eliminate any errors from scanning (which I first thought 
the
> problem was) and the bands are there in all colours.
> 
> I took an A6 test page I printed with one of these and put it back
> into the printer. The centre point of the bands seemed to line up 
with
> one of the high spots in the black undertray where there is foam to
> catch ink, and I am thinking along the lines of there may be a high
> spot here where the ink is hitting the page at strange angles. I am
> also thinking what I can do to investigate further, and I would be
> grateful if anyone has any experience.
> 
> Thanks in advance
> 
> Steve Taylor