Ghost image problem Scanjet 4c?
René
When I scan pictures it makes a sort of softfocus-ghostimage only from the
white parts in the picture. Of course this problem is the most with
high-contrast pictures.
The HP scannertest is sometimes OK, sometimes not OK with the message
"callibrationproblems" and tells me to bring it in.
I opened the scanner and cleaned all mirrors and glass except the lens but
the lens is clean. The problem still appears and has not changed a bit.
Anyone an idea.
Bob Blaylock
>
> I opened the scanner and cleaned all mirrors and glass except the lens but
> the lens is clean.
It's a bit late now, but I hope you were aware that the mirror in a
scanner, as with any mirror in any high-precision optical device, is a
"first-surface" mirror, meaning that it is the front surface, rather
than the back surface, which is silvered. This means that it is very
vulnerable to scratching and other damage. Unless the mirror is
seriously dirty, and you really know what you're doing, I would very
strongly advise against using anything other than canned air to clean
such a mirror.
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Norm G.
Did you for any reason clean, touch the inside surface of your scanner
bed glass?
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The HP scanner test is sometimes OK, sometimes not OK with the message
"callibrationproblems" and tells me to bring it in.
My friend was this before or after you attempted to clean the inside?
Did you bump anything while inside?
At this point if your scanner is still under warrantee, send it in.
I'm in no way harping on you, but Plain and simple, never open the inside of
your scanner for any reason. Many of the same clean standards used in
putting hard drives together are used to put the inside of the scanner
together. Things inside are clean, and sealed, and there are no user
serviceable parts inside. If you need to replace or fix a part inside your
scanner, make sure it is with the blessing of the manufacturer, but most of
the time they will insist you send it in. Many companies such as "SEARS"
will be happy to give you a loaner while your scanner is being repaired.
2. Clean the scanner bed glass, outside only with a cotton or optical
cleaning cloth, and a photography quality lens cleaning solution. NEVER USE
A PAPER TOWEL!!
* * * Do not flip the cloth in your hand while cleaning!! The side that
was in contact with your hand can transfer skin oil back to your glass.
Used compressed gas to clean the glass during regular use, a good quality
paint brush is also fantastic for brush lint and dust off.
Wear cotton or surgical gloves when handling pictures and items to be
scanned to avoid oil transfers. Most drug stores have boxes of exam gloves
very cheap. ONLY Get the non-powder type.
Many window cleaners can leave a film on your scanner bed glass. You won't
see it unless you take it outside on a clear day, and look at the
reflection. You have to almost buff it off after it dries to get it all
off.
A professional quality product for cleaning at the optical level is:
"SQUEEGEE OFF" Miracle Glass cleaner. I mix it up using *distilled* water
only. You only need 2 tablespoons per gallon to mix it at full strength.
It is good for scanner bed glass, refractive telescope mirrors, camera and
optical scanners, copiers, or anyplace you need glass cleaned to perfection.
It also works fine as it's original intention of being the worlds best
window cleaner. Once again what I tell people who use it, is to be sure to
only use distilled water.
Try this... Set your DPI to 300 and lift the lid off your scanner and do a
full scan and look at the image. You should be able to see right there if
it is a smudge or something.
==============================================
Due to spam I use temp email addresses and change
then often. Temp Email address: auto...@hushmail.com
==============================================
"René" <goos...@wxs.nl> wrote in message
news:8bfm8o$5n3d8$1...@reader2.wxs.nl...
I have a little problem with my HP scanjet 4c scanner.
When I scan pictures it makes a sort of softfocus-ghostimage only from the
white parts in the picture. Of course this problem is the most with
high-contrast pictures.
The HP scannertest is sometimes OK, sometimes not OK with the message
"callibrationproblems" and tells me to bring it in.
I opened the scanner and cleaned all mirrors and glass except the lens but
Bob Blaylock
> I'm in no way harping on you, but Plain and simple, never open the inside of
> your scanner for any reason. Many of the same clean standards used in
> putting hard drives together are used to put the inside of the scanner
> together. Things inside are clean, and sealed, and there are no user
> serviceable parts inside.
My ScanJet IIcx has massive, unfiltered venting slots all along both
sides of the case, through which air can freely circulate (and with it,
dust and other airborne debris). It has been necessary, on a few
occasions, to open it up and clean out the accumulated dust, as well as
to clean the underside of the glass.
The ScanJet 6250CXi at my office, though not nearly as "open" as the
IIcx, still falls far short of being sealed up and "clean" the way a
hard drive must be.
To compare the cleanliness standards required for assembling a
scanner, or for opening up for servicing, to the standards required for
a hard drive, is absurd. I doubt if a typical hard drive would run for
as much as ten minutes before suffering a devastating head crash, if the
amount of dust were present inside of it that typically accumulates in a scanner.
Norm G.
about several brands of scanners that are sealed up tight. I offered to
clean some of them, and got told in no uncertain terms these are not to be
opened. I believed that this was an industry standard.
This is always one more thing to learn at the end of the day....
==============================================
Due to spam I use temp email addresses and change
then often. Temp Email address: auto...@hushmail.com
Norm G.
==============================================
"Bob Blaylock" <bob-blayl...@usa.net> wrote in message
news:38DCA8AB...@usa.net...