Re: filmscanners: Two yellow bands ...

["Ezio" <ezio@iname.com>]

----- Original Message ----- 
From: "Arthur Entlich" <artistic@ampsc.com>
To: <filmscanners@halftone.co.uk>
Sent: Sunday, April 01, 2001 6:16 AM
Subject: Re: filmscanners: Two yellow bands ...

Art answered:
> 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.

As above
_____________________

Sincerely.

Ezio