Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 174

Check installation of the Print Cartridge.
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Check that the Print Cartridge ground contacts (on the right side of the Print
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Cartridge and in the Print Cartridge Side Guide in the printer) are clean.
Ensure the machine covers are in place and fit well so no outside light can
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enter the machine.
Background Troubleshooting Procedure
Step Actions and Questions
1 1. Install a new Print Cartridge.
2. Print a Test Print.
Is the background gone?
2 1. Generate a Test Print and switch OFF the printer
power halfway through the print cycle.
2. Carefully remove the Print Cartridge and inspect the
toner image on the drum just before the transfer area
(Transfer Roller).
Are the undeveloped areas of the drum clean
and without background?
3 Clean or replace the Fuser Assembly
Is the background is gone?
4 Replace the following, in order, until the defective
component is found:
HVPS PWB (RRP 9.6 on
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Fuser Assembly (RRP 6.2 on
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Transport Chute Assembly (RRP 6.1 on
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Laser Assembly (RRP 7.4 on
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Print Cartridge Side Guide (RRP 7.5 on
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Engine Logic Board (RRP 9.3 on
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Phaser 4400 Laser Printer Service Manual
(page 6-66).
page 6-92)
page 6-66)
page
page 6-82)
page
page 6-89).
Yes
Problem
solved.
Go to step 3.
Problem
solved.
6-65)
6-83)
No
Go to step 2.
Go to
High-Voltage
Power
Supply
(HVPS)
Assembly on
page 3-31.
Go to step 4.
3-77