Phaser 6121MFP Service Manual 5-17
Print-Quality Troubleshooting
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Print Test Pattern 3 (see
page 6-32).
Does the defect occur on
the printed output?
The problem is in the
print image system.
Go to step 4.
The problem is in the
Scanner system. Go
to step 2.
2 This defect often occurs
when foreign material (i.e.
paper dust, toner, or other
material) deposits on the
document glass. The
scanhead detects the
foreign material while
scanning, and the defect
appears as streaks or
spots on the copy output.
Thoroughly clean the
document glass.
Does the defect still
occur?
Go to step 3. Complete.
3 Reseat all connectors and
cables between the
Scanner, the Image
Processor Board, and the
Engine Control Board.
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 outside of the
Imaging Unit surface
dirty?
Carefully clean the
surface.
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 Is the developing bias
contact terminal of the
toner cartridge connected
properly?
Go to step 7. Clean the contact
terminal or reconnect
the connector. If the
problem persists, go
to step 7.
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