Xerox 4400DT - Phaser B/W Laser Printer, Service Manual, Page: 161 / 503

3-64 Phaser 4400 Laser Printer Service Manual
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Check that the Print Cartridge ground contacts (on the right side of the Print
Cartridge and in the Print Cartridge Side Guide in the printer) are clean.
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Check that the paper is within specifications.
■
Inspect the paper path, between feed and exit, for contamination or
obstructions.
Vertical Streaks Troubleshooting Procedure
Step Actions and Questions Yes No
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?
Go to step 3. Go to step 2.
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?
Remove and
reseat the
Image
Processor
Board. If the
problems
persist,
replace the
Image
Processor
Board (RRP
9.2 on
page 6-88 ).
The problem
appears to
be with the
host
computer or
the cables. If
the problems
persist,
replace the
Image
Processor
Board (RRP
9.2 on
page 6-88 ).
3 1. Install a new Print Cartridge.
2. Print a Test Print.
Are the vertical streaks gone?
Problem
solved. Go to step 4.
4 Inspect the laser beam path between the Laser
Assembly and the Drum.
Is the laser beam path free of obstructions?
Go to step 5. Remove any
obstructions
from the
laser beam
path.
5 Inspect the Transfer Roller Assembly for contamination
and wear.
Is the Transfer Roller free of contamination and
wear?
Go to step 6 Replace the
Transfer
Roller
Assembly
(RRP 7.1 on
page 6-79 ).