5-38 Phaser 7400 Color Printer Service Manual
Process Direction Bands, Voids, or Streaks
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 Reference Table
Applicable Parts Example Print
■ Imaging Unit
■ Transfer Roller
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1
Run the Remove Print Smears
routine from the printers Control
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.
Clean and remove
obstructions.
Go to Step 3.
3
Visual inspect the Imaging Units and
rollers for damage.
Replace the Imaging
Unit.
Go to Step 4.
4
Clean the Fuser where paper enters.
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
Print a test print
Did the test pattern print correctly?
Replace the Image
Processor Board
(
page 8-113).
Replace Engine
Control Board
(
page 8-112).
Process
Scan
s7400-336