(1) My KX-FL501 print smudges as if not properly fused to paper. (2) Some of the print is lighter as if less toner is deposited in some spots. (3) some images, usually heavier ones repeat as ghosts sown page.
Usually ghosting is caused by the fusing unit, which usually means that it needs replaced to be honest. You could try getting into the fuser and giving the rollers a wipe, they may have dry toner on them which could also cause the fault. but i'd say the fuser could need changed!!!
Hope that helps
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Normally ghosting is caused by a bad fuser. Put paper in the manual feed tray(tray 1) Print something. As the paper gets 1/2 way into the printer, open the cover.. Look at the paper. If there is no ghosting, the fuser is bad. If there is ghosting, could be a cartridge drum.
Follow these steps print a Print quality troubleshooting
page to identify which print cartridge is causing the issue.
Click the Help
folder, and then click the Troubleshooting
, to print the page.
The page prints
five bands of color, which are divided into four overlapping sections.
By examining each section, you can isolate the problem to a particular
Figure 4: Print quality troubleshooting page bands1 - Yellow2 - Cyan3 - Black4 - Magenta
Problem is either the cartridge or the fuser. Put paper in the manual feed tray(tray 1) Print something. When the paper gets 1/2 way into the printer, open the top cover. Pull out the toner, look down at the paper. If it has the smudge replace the toner. If no smudge, replace the fuser.
Run a 1/2 test. Put paper in the manual feed tray(tray 1). print something. And watch the paper. As the paper gets about 1/2 way into the printer, open the top cover, remove the toner. Look down at the paper. If you don't see smudged text, the fuser is probably bad. If you see the smudging, replace the toner.
Laser Printers that printouts can be smudged usually means the Transfuser (the part that settles the toner onto paper) is not fully functioning or damaged. Simply replace it and it should be back to normal.
However, these Transfusers are quite expensive. So you may be better off to get a quote for a new one if out of warranty.
Very nice trouble shooting. The image defect you describe point to the OPC or drum unit this is essentially the toner cart. In your case black. Measureing the distance between repetitive defects is a sure way of diagnosing problems such as yours. Again nice work.
Google repetitive defect ruler for your model to help in the future.