HP-35: Clean images

[sasa]

(08-18-2018 08:57 PM)Dieter Wrote:  Using a scanner for such things indeed may work very well – if (!) it's a conventional CCD scanner.

I still have an old CCD scanner I use even today (HP ScanJet 4400c), which wasn't cheap at all when bought brand new long time ago.

The main problem is that inside is not sealed properly and dust is not just outside the glass, but as well inside, which is not possible to clean up without full disassembling. The second problem is that flat cable inside is dragged out while scanning and make quite visible traces on glass. Similar with the whole lamp and CCD module, leaving easily visible vertical traces. (part of the calculator scan image).

As well, light is so bright (and under angle) that shadow is easily visible (LR44/AG13 button cells scans, which are about the same height as HP-35 button). Not even that, there is quite visible chromatic aberration.

Perhaps these problems are not existed with modern CCD scanners.

EDIT: it is ScanJet, of course, not LaserJet...