[gentoo-user] Scanner and weird streaking

[Dale]

Howdy all,

I have a HP scanjet 4570c flatbed scanner.  I bought it used years ago
and most of the time, it works just fine.  On occasion tho, I get
something weird.  When I scan something, it adds some pinkish colored
streaks.  I took a scrap sheet of paper and scanned the back of it. I
used a magic marker on some text that was there, also drew a smiley face
on it as well.  Anyway, the side with print is on the opposite side. 
Basically, it is also seeing the back side of the paper.  I'm not sure
if that could cause this weird streaking but wanted to mention it.

At first, I thought it was something on the glass so I disassembled the
thing and cleaned it as best as I could.  When I put it back together, I
concentrated on the back side of the glass, since I have to disassemble
it to clean it.  I also clean the side the document goes on regularly. 
If it changed, I can't tell it.  Another odd thing, the streaks change
depending on the document.  Sometimes you can barely see it, other times
it is awful.  I've not been able to reason out what makes the difference
tho. 

I've got about the same results using Scanlite, Scanpage and XSane
software.  XSane may be a tiny bit better but it does vary at times.
There's not a lot of settings available.  I tend to use either 100dpi or
300 dpi for resolution thingy. I fiddled around a bit but it doesn't
seem to help.  This is a link to the page I described above.  It's a
little sizey so I didn't want to attach, for those who have email
clients that puke a lot.  lol 

https://freeimage.host/i/HTQLpWb

You may notice that it is a little heavier at the top and gets lighter
as it goes down.  I've checked the glass, I can't find anything that
would cause this.  Is my scanner just going bad?  Am I doing something
wrong with a setting or something?  Any ideas?  Thoughts?

Thanks.

Dale

:-)  :-) 

P. S.  After a couple weeks, my backup finished for that large directory
on the NAS.  I even did a update.  It took a while but it's done.  It
would have been sooner but we had a power failure, or two.  It got
really cold here.