Xerox Phaser 6120 Service Manual - Low Image Density
Image-Quality Problems
Phaser® 6120 Color Laser Printer Service Manual
4-28
Low Image Density
Typical Faulty Images
Troubleshooting Procedure
Step
Section
Check Item
Result
Action
1
Imaging Unit Is the outside of the imaging unit
dirty?
YES
Clean.
2
Laser (PH)
Unit
Is the window surface dirty?
YES
Clean.
3
Transfer Belt
Unit
Check the mounting shafts on the
transfer belt assembly to ensure the
assembly is fully seated and installed
correctly.
NO
Check or correct contact.
4
Is the contact dirty?
YES
Clean.
5
2nd Transfer
Roller
■
Is the high-voltage contact dirty?
■
Are the contact springs correctly
seated?
■
Is the high-voltage bias spring in
the correct location (making
contact with the plate.?
YES
NO
NO
Clean.
Reseat
Realign spring.
6
Paper
Is the paper damp?
YES
Replace the paper with new paper
that has just been unwrapped.
7
Density
Sensor
Is the sensor dirty?
YES
Clean.
8
Have steps 1-7 eliminated the
problem?
NO
■
Replace the Toner Cartridge.
■
Replace the Transfer Belt Unit.
■
Replace the Transfer Roller.
■
Replace the Laser Unit (PH).
■
Replace the Density Sensor.
■
Replace the Control Board.
■
Replace the High Voltage
Unit.
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