Lexmark T520 - 20ppm 8MB Par USB Pcl6 Ps3 Ppds Service Manual page 127

4520-xxx
Print Quality - Toner on backside of printed page
Service Tip: This is generally caused by loose toner in the machine
in the paper path being carried through the printer on the backside of
the paper.
FRU
1 Hot Roll Fuser Assembly
2 Transfer Roll Transfer Plate
Assembly
Action
Toner is being carried out on the
backside of the media. This problem
is generally caused by a toner
buildup on the fuser hotroll or backup
roll. Check the fuser hotroll and
backup roll for any noticeable
buildup of toner. Repair as
necessary.
Check the transfer roll for any signs
of toner buildup or loose toner
around the area of the transfer plate
assembly. Clean the area and run
another copy. If the problem
continues, replace the FRUs in the
following order:
1. HVPS
2. Engine board
Diagnostic Information
2-99