Digital BW, The Print

(snip earlier)

Jim,

Thanks for the reminder. Basic stuff like this has a tendency to fade from
the collective and individual memory.

Martin
>
> 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.