Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 163

Horizontal 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 horizontal 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 horizontal streaks?
3 1. Install a new Print Cartridge.
2. Print a Test Print.
Are the horizontal streaks gone?
4 1. Remove the Print Cartridge.
2. Inspect the metal grounding contacts on the Print
Cartridge Side Guide.
Is the metal grounding contact intact and free of
contamination?
5 Check for the continuity between the metal grounding
contacts and the printer body frame.
Is there continuity between the grounding
contacts and the Printer Frame?
6 Inspect the Transfer Roller Assembly for contamination
and wear.
Is the Transfer Roller free of contamination and
wear?
3-66 Phaser 4400 Laser Printer Service Manual
Yes No
Go to step 3. Go to step 2.
Remove and The problem
reseat the appears to
Image be with the
Processor host
Board. If the computer or
problems the cables. If
persist, the problems
replace the persist,
Image replace the
Processor Image
Board (RRP Processor
9.2 on Board (RRP
page 6-88). 9.2 on
page
Problem Go to step 4.
solved.
Go to step 5. Reform or
clean the
Metal
Grounding
Contact, so
it makes
better
contact with
the drum
shaft, or
replace the
Print
Cartridge
Side Guide
(RRP 7.5 on
page
Go to step 6. Replace the
Print
Cartridge
Side Guide
(RRP 7.5 on
page
Go to step 7. Replace the
Transfer
Roller
Assembly
(RRP 7.1 on
page
6-88).
6-83).
6-83).
6-79).