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From: masspete on 10 Feb 2006 01:04
I'm quite impressed with myself in that I seem to have managed to get
streaks on the underside of the glass of my HP 2200c flatbed scanner.

What I think must have happened is, I wiped the glass clean with some
fluid during a scanning session. Having scanned quite a bit already,
the lamp had made it warm inside, so the cool fluid probably cooled the
glass and caused condensation on the other side that caused the
streaks.

I'm going to need to open the scanner up and clean the underside if I
ever want clear scans again. Does anyone have any advice for going
about this? Is there the potential for fouling up its calibration at
all? Any advice for dealing with the inevitable entry of dust in there
once I open it up?

Thanks!

From: Davy on 10 Feb 2006 08:33
Static build up.... You can get a lot of pretty patterns of dust
inside the back cover of a TV set (you can get a load of muck as
well), they call these patterns Newtons rings.

The scanner uses a DC-DC converter generating about 2Kv (2000V) for
the CCFL (Cold Cathode Flourescent Lamp), this plus the warmth will
no doubt attract microscopic dust.

Yeah yeah....! I know it'a all sealed in a box, it appears to come
from no where, same with the flouresecent displays on audio hi-fi's
but they only use about 35V funny thing is I have never noticed it
inside the glass covers of LED displays.

Come to think...(what with I dunno).
just the things that uses electrons and not that of a stationary items
that emits light like LED's etc, CCFL, Flourescent display's or
digitrons as called in the trade uses electrons hitting the
flourescent coating, high speed electrons carrying a static charge
perhaps is the cause...?

Mine could do with a clean as well come to think.. the only time to
worry is when it starts to be seen on the copy, the white light from
the CCFL is of a fair intensity.

Davy

From: masspete on 10 Feb 2006 11:17

Davy wrote:
> Mine could do with a clean as well come to think.. the only time to
> worry is when it starts to be seen on the copy, the white light from
> the CCFL is of a fair intensity.

Yup, regardless of the cause, it's reflecting light. Lighter images I
can get away with, but very dark ones end up with a ghost-like film.

From: mark_digital? on 11 Feb 2006 19:00
What works for me is a dry micro cloth. Exactly the same cloth I use for my
perscription glasses. The cloth is reusable up to a point. Afterwards it
can be washed clean using Woolite.
A wet type cloth for eye glasses will leave streaks because of the larger
area you're trying to clean versus the smaller glass it was meant for.
The majority of little floating particles in the air are actually flaked
human skin. If there's any doubt about this the next time a beam of sunlight
show's through your bedroom window ruffle up your top spread abit. The beam
will fill up with particles fast. Another daunting supply can be had by
slapping the living room cushions. Hey, as long as people live in the house
it's gonna happen.
Anyway, hold the cleaned surface downward and put your scanner back
together.

<masspete(a)my-deja.com> wrote in message
news:1139551190.497504.242200(a)g14g2000cwa.googlegroups.com...
> I'm quite impressed with myself in that I seem to have managed to get
> streaks on the underside of the glass of my HP 2200c flatbed scanner.
>
> What I think must have happened is, I wiped the glass clean with some
> fluid during a scanning session. Having scanned quite a bit already,
> the lamp had made it warm inside, so the cool fluid probably cooled the
> glass and caused condensation on the other side that caused the
> streaks.
>
> I'm going to need to open the scanner up and clean the underside if I
> ever want clear scans again. Does anyone have any advice for going
> about this? Is there the potential for fouling up its calibration at
> all? Any advice for dealing with the inevitable entry of dust in there
> once I open it up?
>
> Thanks!
>


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