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Horizontal line
If the line appears in a particular color, go to step A. If it appears in full-color print, go to step
B.
Table 7-28. Causes for horizontal line
Cause Solution
A The developing cylinder is deformed by being
left engaged with the photosensitive drum for a
long time.
Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, to find out if the interval
of line agrees with that of a developing cylinder. If
so, output about 20 pages of print to solve the
problem. If the problem is not resolved, replace
the cartridge.
Horizontal scratches on the photosensitive drum
(cartridge).
Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, to find out if the interval
of line agrees with that of a photosensitive drum. If
so, replace the cartridge.
Print cartridge cleaning blade leaves a line of
toner on the drum (C-blade blur). This error is
similar to using a dust pan and broom. The line
repeats every 77mm.
At the printer control panel, set CONFIGURE
DEVICE/PRINT QUALITY/OPTIMIZE/ PRE-
ROTATION=ON
B Horizontal scratches on the fuser sleeve. Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, to find out if the interval
of line agrees with that of a fuser sleeve. If so,
replace the fuser.
White horizontal line
If the line appears in a particular color, go to A. If it appears in full color, go to B.
Table 7-29. Causes for white horizonal lines
Cause Solution
A Horizontal scratches on the photosensitive
drum (cartridge).
Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, to find out if the interval
of line agrees with that of a photosensitive drum. If
so, replace the print cartridge.
B Horizontal scratches on the transfer unit. Check the transfer unit surface for horizontal
scratches. If any, replace the transfer unit.
C The fuser sleeve is deformed by being left
engaged with the pressure roller for a long time.
Refer to the Table 7-39. Repetitive defect cause
table, later in this chapter, to find out if the interval
of line agrees with that of a fuser sleeve. If so,
replace the fuser.
396 Chapter 7 Troubleshooting ENWW