Service Manual
6-13
Troubleshooting
6
Streaks or lines in the print parallel to the printhead travel
1.
Possible missing weak jet. Print the Service Test Print 2 “Weak Jet” to
determine if a jet is not performing. Perform a printhead cleaning
cycle to try to clean a clogged jet. If necessary, turn off the printer and
allow the printhead to cool for 3 hours.
2.
Check the y-axis belt tension. If the y-axis drive is not smoothly and
consistently rotating the drum, horizontal bands or lines appear in the
print.
3.
Check the fuser for proper operation. Ensure that the fuser oiler wheel
contains oil. A dry fuser can pull ink off of the print as it fuses it.
4.
The Drum Step Compensation Adjustment, whose value is stored in
NVRAM, should be within -30 to +30. The drum is either stepping too
much or not enough for each pass of the printhead. Refer to the
Chapter 9 topic “Drum step adjustment” on page 9-26.
5.
Ensure that no wiring harnesses are interfering with the horizontal
movement of the printhead.
6.
Replace the engine control board.
7.
Replace the carriage board.
Scratches in transparencies parallel to the paper path travel
1.
Usually caused by foreign debris in the paper path. Inspect the paper
path for foreign matter that could scratch transparencies.
White portion of print is colored
1.
Clean the paper tension blade and the paper clamp. Also inspect and
clean the fuser.
2.
Perform a printhead cleaning cycle.
3.
Check the connections to the carriage board.
4.
Replace the engine control board.
5.
Replace the printhead.
Color is uneven
1.
Perform the Chapter 9 procedure, “Adjustments” on page 9-4.
2.
Replace the printhead; this is explained in the Chapter 8.
