[sane-devel] Rainbow couloured stripes = DC adapter problem?

[Jonathan Buzzard]

henning@meier-geinitz.de said:
> I have never seen such a problem, but yes, I think that's possible. If
> the unevenness is really a problem, adding a big electrolytic
> capacitor may help. 
>
> Another reason may be that the DC adapter is not powerfull enough. One
> of my scanners needs 1 A at 12 V and if I use one of my standard 1.2 A
> DC adapters, the images are much too dark. Well, the DC adapter can
> supply 1.2 A, but then the voltage is down to about 6 V :-/ 

Indeed, the biggest problem is that the replacement adaptor sounds
as if it is unregulated. While the original SMPS would not have
fantastic regulation, it would be much better than an unregulated
device.
 
Try again with a regulated power supply, that can supply at least
25% more current than the scanner is rated at, and ideally 50%

JAB.

-- 
Jonathan A. Buzzard                 Email: jonathan@buzzard.org.uk
Northumberland, United Kingdom.       Tel: +44(0)1661-832195