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RE: filmscanners: My replacement 8000 is banding like the first one :-(

Title: RE: filmscanners: My replacement 8000 is banding like the first one :-(

This is a possibility.  As I mentioned, when I had the LS8000, it did not always band.  Sometimes it would and sometimes it wouldn't.  Nikon tech support did mention moving the scanner to a different location to rule out RF interference or other sources of noise.  This was confirmed as a possibility by my father who's an electrical engineer/research scientist with a lot of experience designing analog circuits used in the same environments as digital stuff.

Paul Wilson

> -----Original Message-----
> From: Isaac Crawford [mailto:isaac@visi.net]
> Sent: Thursday, July 19, 2001 12:03 PM
> To: filmscanners@halftone.co.uk
> Subject: Re: filmscanners: My replacement 8000 is banding
> like the first
> one :-(
> Stephen Kogge wrote:
> >
> >         Re the "banding problem"
> >
> >         My first reaction was that the scan is being done
> "off" a native
> > resolution 4000 dpi, 2000 dpi, 1333.333 dpi, 1000dpi etc
> and that software
> > interpolation was/is being done.
> >
> >         After a few of the other comments about possible mechanical
> > problems I remember watching either my AT210 (flatbed) or an HP
> > doing it's "scan dance" where it scans forward, pauses while the
> > programed IO SCSI interface dumps the scan buffer, backs up past
> > the backlash of the gears then scans forward for another chunk.
> > A lot of the early scanners had poor SCSI performance.
> >
> >         Does the scanner seem to stop and start or is it a
> smooth scan?
>       This is completely out of left field, but could it be a
> power supply
> (in the scanner) issue? Someone else commented on how this
> only seems to
> show up with scanners using stepper motors... Could the stepper motors
> cause spikes in the PSU that could interfere with the imaging side of
> things? Either sending noise to the CCD, or even pulsing the light
> source are a couple of possible ramifications... Just a wild guess...
> Isaac


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