Digital BW, The Print

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Martin Wesley"
<mwesley250@e...> wrote:
> ----- Original Message ----- 
> From: "Chris Mende" <chrismendefoto@n...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Thursday, May 22, 2003 10:39 AM
> Subject: Re: [Digital BW] Addendum to Banding with new CIS
> 
> 
> > No, Martin - this is very visible without a loupe - it's particularly
> > visible in midtones and highlights, but runs  throughout the image.  I
> > printed the purge pattern with both Epson and Piezo drivers, at
> > highest resolution, then printed a portrait with Peizo at best
> > quality.  Nozzle checks and alignments are now looking good.
> 
> Chris,
> 
> At this point I'm not sure what to tell you. It's tough not having an
> example to look at. Perhaps your original thoughs on the rollers is
correct
> and they need to be cleaned. How old is the printer by they way?  You
> probably said earlier in the thread but I don't recall.
> 
> Martin
> 
> (snip earlier)

Well of course there is the old Jon Cone Epson 3000 trick to check for
transport problems as the culprit in dark banding (or light banding
for that matter):

Take a file of a known size, like 9.75 inches long (or metric if you
prefer). Make sure you print it as you would your other prints at
100%. Take a very accurate ruler, I use an engineers scale but
anything really will do, and measure the actual printed output length.

If the printout is shorter by a minimum of 1.6mm (1/16 inch) your
print is slipping causing horizontal dark banding. If longer by at
least the same amount the transport is advancing paper too quickly and
you then see white lines.

If printout is within +/- 1/16 inch of file size, the problem is
likely not the transport.

The 1/16 inch assumes about a ten inch length. If you decide to do a
18 inch length you might want to allow larger tolerances.
Jim Hayes