Xerox Phaser 7300B, Service Manual, Page: 125 / 277

Troubleshooting 3-109
Dark Streaks in a Single Color or All Colors in the
Direction of Paper Travel
.There are dark lines running along the page in
the direction of paper travel from the leading
edge to the trailing edge
This is generally due to fuser, paper path roller
and/or exit guides contaminated with toner
debris.
.
Troubleshooting Procedure
Step Check Yes No
1 Run the Remove Print Smears routine from the
printers front panel.
Did this fix the problem? Complete Go to step [2].
2 Are there any obstructions, dirt or debris in the
printer’s paper path.
Check for toner spills inside the printer. Clean and
remove
obstructions. Go to step [3].
3 Visual inspect the Imaging Units and rollers for
signs of damage.
Note: Exposure to light can damage the
Imaging Unit, examine the unit quickly
and out of direct sunlight.
Replace the
defective
Imaging Unit. Go to step [4].
4 Check the Fuser where paper enters for spilled
toner or contamination.
Clean if dirty. Did this fix the problem?
Complete Go to step [5].
5 Verify the ribbon cables and wiring harnesses
on the LED Heads are seated, connected and
routed properly.
Go to step [6]. Reseat, reroute
or replace any
damaged wiring
harnesses.
6 Generate a service test print pattern from within
service diagnostics. This will test the Engine
Controller Board.
Did the test pattern print correctly? Replace the
Image Processor
Board. Replace Engine
Controller
Board.
Process
Scan
S7300-038