Lexmark E250D - E B/W Laser Printer Service Manual page 164

Print defects guide
Defects often repeat down a page. In such cases, matching the defect frequency to one of the sets of vertical
lines below can help identify the particular part that may be causing the defect.
For example, the distance between these two marks represents a
repeating defect caused by the toner cartridge.
Replace
Transfer Roller
(call for service)
(customer replaceable item)
Replace
Toner Cartridge
(customer
replaceable item)
Replace
Photoconductor Kit
If you are unable
to distinguish
between these
two marks,
replace the
Photoconductor
Kit before
replacing the
Fuser.
OR
Print defects guide
Page 1 of 1
Replace Fuser
(call for service)
OR