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Re: filmscanners: Two yellow bands ...
----- Original Message -----
From: "Arthur Entlich" <email@example.com>
Sent: Sunday, April 01, 2001 6:16 AM
Subject: Re: filmscanners: Two yellow bands ...
> Ezio wrote:
> > Dearests ,
> I didn't know you cared ;-)
> I have these 2 yellow bands on the HP-6200c flatbed.
> Ah, I see you want something from us ;-)
Does it happens outside Italy too ? ;-)
> These bands can be caused by several things. In order of ease to fix:
> 1) The glass could have dirt on it (not likely to be that linear)
> Fix: Clean glass, both inside and out
DONE ... no improvements
> 2) The calibration strip might have been damage
> Most flatbeds have a calibration process they go through to set each CCD
> threshold for each scan. This strip is usually glued under the top
> surface of the scanner under the plastic casing, above the glass platen
> at the top of the scanner, which the sensor bar reads to adjust the
> voltages of the sensors. If this has become scratched of damaged in the
> black areas, it will cut back on the sensitivity of the CCD sensors in
> that area. So, you might need a new calibration area, or it might
> require a cleaning (since you have yellow bands, it is more likely the
> black is rubbed off than the white parts are dirty.)
> Fix: Open up scanner to observe calibration strip, clean or
> repair/replace, as needed.
I'll open today ....
> 3) The scan head/CCD of mirrors might have some dirt on them. They will
> need very careful cleaning. Keep in mind scanners and photocopiers use
> FRONT surfaced mirror which are easily scratched.
> Fix: Open scanner, carefully clean all optical components.