Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 161

Check that the Print Cartridge ground contacts (on the right side of the Print
I
Cartridge and in the Print Cartridge Side Guide in the printer) are clean.
Check that the paper is within specifications.
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Inspect the paper path, between feed and exit, for contamination or
I
obstructions.
Vertical Streaks Troubleshooting Procedure
Step Actions and Questions
1 1. Enter Service Diagnostics and select "Engine Test
Print."
2. Scroll to "Print Quantity" and press OK.
3. Press OK to move the cursor over the last digit, then
press the UP key until the last digit is "5." Press
"Back" to return to the Engine Test Print menu.
4. Scroll to Print Test Pattern and press OK.
Do the test prints have vertical streaks?
2 1. Exit Service Diagnostics.
2. When the printer is Ready, scroll to "Printable Pages"
and press OK.
3. Scroll to "Print Configuration Pages" and press OK.
Do the prints have vertical streaks?
3 1. Install a new Print Cartridge.
2. Print a Test Print.
Are the vertical streaks gone?
4 Inspect the laser beam path between the Laser
Assembly and the Drum.
Is the laser beam path free of obstructions?
5 Inspect the Transfer Roller Assembly for contamination
and wear.
Is the Transfer Roller free of contamination and
wear?
3-64
Yes
Go to step 3.
Remove and
reseat the
Image
Processor
Board. If the
problems
persist,
replace the
Image
Processor
Board (RRP
9.2 on
page
Problem
solved.
Go to step 5.
Go to step 6
Phaser 4400 Laser Printer Service Manual
No
Go to step 2.
The problem
appears to
be with the
host
computer or
the cables. If
the problems
persist,
replace the
Image
Processor
Board (RRP
6-88). 9.2 on
page 6-88).
Go to step 4.
Remove any
obstructions
from the
laser beam
path.
Replace the
Transfer
Roller
Assembly
(RRP 7.1 on
page 6-79).