Hi there
Try to scan in a sample but even on 600dpi it doesn't show on the scanned file, so I'll try to explain to the best of my ability. The problem seems to fluctuate, sometimes darker ghosting than other times. We have had this problem in various degrees for the last 700,000 copies. Everytime the problem comes up we replace parts (different parts) and it seems to go away for a while, just to return later. The majority of the copies done are black, this problem only occurs with black copying or printing. If there was any colour on the page together with bold black printing the problem does not occur.
The following has been done to try and rectify the problem:
Replaced the black dev units
Replaced the MFP board
Tried different firmware versions
Did the black I.U. modification
Replaced transfer belt and rollers.
Did transfer settings as per bulletins
Varied fuser transport speed.
Various other settings as per bulletins.
I'm now completely out of ideas.
Many Thanks.
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