My Officejet PRO 8600 is exhibiting very strange behavior.
When I COPY a page in Black&White mode, the page is very faint. (Before you say this is a problem with the ink, read on)
However if I copy the same page in Color mode, it copies fine. Also, printing in either Color or B&W mode from a computer produces perfectly normal (non-faint) results.
As a test I printed a test page, which came out looking normal. I then COPIED that page on the printer in Color mode. The copy was nearly indistinguishable from the original. Finally I made another copy of the same test page in B&W mode, and this copy was nearly unreadable.
Whatever is wrong, it is affecting only the COPY function, and only in B&W mode. I thought maybe there was a problem with the copy illumination, but the copy function works fine in color mode, it fails only in B&W mode. This also eliminates the ink system as a cause since the printer works fine in all modes except B&W COPY.
Suggestions?
Here are color scans of the pages that demonstrate the problem
Original Test Page
Copy in Color Mode
Copy in B&W Mode