Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 154

Blank Prints Troubleshooting Procedure (cont'd.)
Step Actions and Questions
4 1. Remove the Print Cartridge.
2. Inspect the Metal Grounding Contact on the
Print Cartridge Side Guide.
Is the Metal Grounding Contact intact
and free of contamination?
5 Check for continuity between the Metal
Grounding Contact and the printer frame.
Is there continuity between the
Grounding Contact and the printer
frame?
Is the Transfer Roller intact and free of
6
contamination?
7 1. Generate a Test Print as in step 1 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).
Is the image on the drum completely
developed with sharp, black,
easy-to-read areas?
8 Replace in order until the problem is solved:
HVPS PWB (RRP 9.6 on
I
Laser Assembly (RRP 7.4 on
I
Transfer Roller Assembly (RRP 7.1 on
I
page 6-79),
Engine Logic Board (RRP 9.3 on
I
LVPS PWB (RRP 9.5 on
I
Print Cartridge Side Guide (RRP 7.5 on
I
page 6-83)
Phaser 4400 Laser Printer Service Manual
page 6-92)
page 6-82)
page 6-89).
page 6-91)
Yes
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
No
Reform or clean
the Metal Ground-
ing Contact, so
they make better
contact with the
drum shaft, or re-
place the Print
Cartridge Side
Guide (RRP 7.5
on page 6-83).
Replace the Print
Cartridge Side
Guide (RRP 7.5
on page 6-83).
Replace the
Transfer Roller
Assembly (RRP
7.1 on
page 6-79).
Go to
High-Voltage
Power Supply
(HVPS) Assembly
on page 3-31.
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