Begin by powering off the printer. In addition, unplug the printer from the wall outlet.
Remove the leaking toner cartridge installed and discard it.
IMPORTANT! If you plan to seek a warranty replacement for the leaking cartridge, hold onto it. The cartridge may need to be returned to get credit for a replacement cartridge. For information on how to seek a warranty replacement of a toner cartridge, contact Lexmark Technical Support. Be aware that third-party toner cartridges and Lexmark brand cartridges refilled by another company are not covered by Lexmark's warranty and will not be replaced.
Using a dry, lint-free cloth, clean out as much of the loose toner as possible.
IMPORTANT! If possible, remove the transfer roller and clean it. In addition, check the housing underneath the transfer roller. Toner can accumulate in this area.
Next, try cleaning the cartridge ID contacts inside the printer. The contacts are located along the left-hand side of the printer, in the area where the toner cartridge is installed. Click here to view picture.
The best way to clean the contacts would be with a dry cloth, a wet wipe with isopropyl alcohol, or a cotton swap with isopropyl alcohol on it. NOTE: If you use a cotton swab, use caution not to leave any loose cotton strings stuck on the contacts or the contact board.
If you have access to a small toner vacuum, try to vacuum as much of the toner out as you can. If possible, remove the transfer roller and check the area underneath for toner.
IMPORTANT! Use a vacuum equipped with a HEPA or similar type of filter to prevent any airborne contamination.
Once you have removed as much of the toner as you can, reinstall the transfer roller (if you removed it). Install a different/new toner cartridge.
Plug the printer in the wall outlet, and then power it back on. Confirm that the printer powers up to the 'ready' status.
Try printing again. If the printer works correctly and the quality of the print is good, continue using the printer. Pay close attention to the printer over the next few days to see if any issues occur.
If the Defective Cartridge error returns, or if any new problems occur, please contact Lexmark Technical Support for additional suggestions.