5/2011
3-18
Phaser 4600/4620 Printer Service Manual
IQ16
Revision - Xerox Internal Use Only
Image Quality
IQ16 Uneven Density
Image density varies across the page in either direction.
WARNING
Switch off the electricity to the machine. Disconnect the power cord from the customer
supply while performing tasks that do not need electricity. Electricity can cause death or
injury. Moving parts can cause injury.
WARNING
Do not touch the Fuser while it is hot.
Initial Actions
•
Check media type settings are correct.
•
Load new, dry paper that meets specifications.
•
Check that the Toner Cartridge is properly installed and not empty.
•
Ensure that the printer is level.
•
Check to make sure the Laser path is clean and unobstructed.
•
Remove the Drum Cartridge and check for contamination or obstructions.
Figure 1 Uneven density defect example
Procedure
Check the paper condition. Load new, dry recommended paper, and print a test print. The
image includes density defects.
Y
N
Perform SCP 6 Final Actions.
Remove the Drum Cartridge, clean the electrical contacts, then print a test print. The image
has density defects.
Y
N
Perform SCP 6 Final Actions.
Replace the Drum Cartridge and reprint the test print. The image has density defects.
Y
N
Perform SCP 6 Final Actions.
Remove the Transfer Roller and check for surface contamination or excessive wear. The
Transfer Roller is good.
Y
N
Replace the Transfer Roller,
REP 9.1
.
Print a test print. While the print is printing, turn off system power. Remove the Drum Cartridge
and check the image formed on the drum right before the Transfer Roller. The image is
poorly formed, faint and difficult to read.
Y
N
Check the image formed on the drum, right after the Transfer Roller. The image is com-
pletely transferred to the paper
Y
N
Replace the Transfer Roller,
REP 9.1
.
Continue with the procedure.
Remove the Fuser. Check for damage or debris on the rollers. The Fuser rollers are good.
Y
N
Clean or replace as necessary;
•
Heat Roller
PL 10.11
•
Pressure Roller
PL 10.11
•
Fuser
PL 10.10
Replace the following, in order, until the defective component is found.
•
Transfer Roller,
REP 9.1
.
•
Fuser,
REP 10.10
