Lexmark Optra K 4046, Service Manual

Page: 49 / 156

Diagnostic Information 2-19
Print Quality - Toner on the Back Side of a Printed Page
Print Quality - Blurred Print
Blurred print is usually caused by a problem in the feed roller, main
motor gear box assembly, or other gears transferring power to the
feed rollers. Check the gears for contamination of binds. Also be
sure the paper is feeding correctly from all available input trays.
Print Quality - Evenly Spaced Horizontal Lines or Marks
FRU Action
1 Fuser Toner is being carried out on the back side of the
media. The problem is generally caused by a toner
buildup on the fuser hot roll or backup roll. Check
these rolls for any noticeable buildup of toner.
Replace the fuser if necessary.
2 Transfer
Corona Check the transfer corona for toner buildup or loose
toner. Toner in this area can usually be cleaned
from the printer. Replace the transfer corona if it is
excessively contaminated or if you cannot clean it.
See also the
“Transfer Corona Service Check” on
page 2-29 .
3 Print Unit Check the precharger wire on the print unit for
dirt or contamination. Clean the print unit with
the tool provided with the printer. Check the
PC drum on the print unit for loose debris or
foreign material. Clean the debris from the
print unit but do not touch the PC drum sur-
face. If you still have the problem, inform the
customer the print unit must be replaced.
Distance Between Lines or Marks Cause and Action
93mm (3.6 inches) This can be caused by the PC drum
or the gear driving the PC drum on
the print unit. Inform the customer
the print unit needs to be replaced.
55mm (2.2 inches) This can be caused by the main
motor gear box assembly. Replace
the gear box assembly.