Phaser 6121MFP Service Manual 5-15
Print-Quality Troubleshooting
3 Reseat all connectors and
cables between the
Scanner and the Image
Processor Board, and the
Engine Control Board, and
then make another copy.
Does the defect still
occur?
Replace the Scanner
Unit (page 8-31).
Complete.
4 Does the defect occur in
only one color on the test
print?
Replace the toner
cartridge associated
with the defect. If the
defect persists, go to
step 5.
Go to step 5.
5 Inspect the Imaging Unit:
Are there scratches or
lines evident on the photo
conductor surface?
Replace the Imaging
Unit (page 8-6).
Is the connector or
contact terminal of the
Imaging Unit dirty?
Clean the contact
terminal.
Does the problem persist? Go to step 6. Complete.
6 Check the Laser Unit:
Are the connectors and
terminal contacts of the
Laser Unit connected
properly?
Reseat the
connectors and clean
the terminal contacts.
Is the laser window
surface clean?
Go to step 7. Clean the laser
window.
If the problem
persists, go to step 7.
7 Is the Transfer Roller dirty
or damaged?
Replace the roller
(page 8-56). If the
problem persists, go
to step 8.
Go to step 8.
8 Check the paper path.
Is there a foreign object
or obstruction in the
path?
Remove the object
and reprint the test
page. If the problem
persists, go to step 9.
Go to step 9.
9 Inspect the Fuser.
Is the fusing entrance
guide plate or the
separation claw dirty or
scratched?
Clean the guide plate
and reprint the test
sheet. If the problem
persists go to step 10.
Go to step 10.
Troubleshooting Procedure Table (continued)
Step Actions and Questions Yes No
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