Lexmark 651de - X B/W Laser Information Manual page 15

Print defects guide
Repeating defects measurements
Match a set of repeating defects on a print job to the marks on one of the vertical lines. The line that best matches the defects
on the print job indicates which particular part is causing the defect.
Replace the charge rolls
28.3 mm
(1.11 in.)
Replace the transfer roller
51.7 mm
(2.04 in.)
Change the toner cartridge
47.8 mm or 96.8 mm
(1.88 in.) (3.81 in.)
Print defects guide
Page 15 of 18
Replace the fuser
88.0 mm or 95.2 mm
(3.46 in.) (3.75 in.)