Xerox 4400DT - Phaser B/W Laser Printer Service Manual page 152

Light Prints Troubleshooting Procedure (cont'd.)
Step Actions and Questions
4 Check for the continuity between the Metal
Grounding Contact and the printer body frame.
Is there continuity between the Metal
Grounding Contact and the printer frame?
5 Inspect Laser beam path between the Laser
Assembly and the Drum for obstructions.
Is the laser beam path free of obstructions?
6 Is the Transfer Roller intact and free of
contamination?
7 Generate a Test Print and switch OFF the printer
power halfway through the print cycle. 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 Inspect the toner image on the drum immediately
after the transfer area (Transfer Roller).
Is the toner image on the drum transferred
completely to the paper?
9 Replace in order until the problem is solved:
HVPS PWB (RRP 9.6 on
I
Laser Assembly (RRP 7.4 on
I
Engine Logic Board (RRP 9.3 on
I
Transport Chute Assembly (RRP 6.1 on
I
Phaser 4400 Laser Printer Service Manual
page 6-92),
page 6-82),
page 6-89),
page
Yes
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.
Go to step 9.
6-65).
No
Replace the
Print Cartridge
Side Guide
(RRP 7.5 on
page 6-83).
Clean the
Laser window
and remove
any
obstructions
from the laser
beam path.
Replace the
Transfer Roller
(RRP 7.1 on
page 6-79).
Go to
High-Voltage
Power Supply
(HVPS)
Assembly on
page 3-31
Go to
(High-Voltage
Power Supply
(HVPS)
Assembly on
page 3-31)
3-55