Problem with scanning hardware introduces artifacts when scanning and copying

Artifacts, in the form of specs, have begun showing up when using the scanning capability ofmy old HP OfficeJet G85. They are always present and always in the same place.It manifests the same way particulate residue on the glass would; e.g., if you used "white out" to correct an original.then scanned it before the white out dried, It would leave some of the "white out" liquid on the glass.Until you cleaned the glass, the smudge of "white out" would appear as artifacts on any subsequent scans or copies.

Aways showing up scanning and copying, but never printing suggests to me that it's either particulate matter on the scanning head or the inside of the glass, or some other defect in the scanning head.

Any body have any ideas about what's going on and whether there's anything I can do to try to fix it myself?
petewinnAsked:
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hdhondtCommented:
You don't say whether you have cleaned the scanning glass. If you didn't, get a lint-free cloth dampened with isopropyl aclcohol and give it a good wipe. If you don't have isopropyl acohol, use some other alcohol (e.g. metho) or even water. Concentrate on the areas where the spots are.

Before cleaning, you could try to do a scan with the document feeder up. The scanning lamp should make the dirt spots clearly visible. And, it may show that the dirt is on the inside, in which case the machine has to be taken apart.

As the scanning head moves, that cannot be the problem (it would leave lines instead of spots). Similarly, using the document feeder would leave lines on the scans.
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petewinnAuthor Commented:
Yeah - I tried the glass - that was the first thing I though of too. The next most obvious thing would be to try to clean the inside (bottom) side of the glass - but I don't know how to get into that part of the machine - the only referance I could find was not helpful.
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hdhondtCommented:
Can you see any dirt on the inside if you scan with the lid lifted up?

I don't know how to get inside either, but this place may be able to help:
http://www.2manuals.com/g85.htm

The service manual, which has disassembly instructions, is $14.99
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