5-28 Phaser 6121MFP Service Manual
Print-Quality Troubleshooting
Back Marking
The copy includes markings on the backside of the image.
Initial Actions
Perform the initial actions listed on page 5-5.
Troubleshooting Reference Table
Applicable Parts Example Print
■ Imaging Unit, PL4.013
■ Transfer Roller, PL7.1.10
■ Fuser, PL11.0.18
■ High Voltage Board, PL13.0.6
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Check the paper path.
Is there a foreign object in
the paper path?
Remove the
obstruction. If the
problem persists, go
to step 2.
Go to step 2.
2 Inspect the Fuser.
Is the fusing entrance
guide plate dirty, or is the
Fuser Roller dirty or
scratched?
Clean or replace the
Fuser (page 8-9). If
the problem persists,
then go to step 3.
Go to step 3.
3 Check the Transfer Roller.
Is the roller dirty or
damaged?
Replace the Transfer
Roller (page 8-9). If
the problem persists,
go to step 4.
Go to step 4.
4 Has the problem been
eliminated?
Complete. Replace the following
units, listed in order,
until the problem is
eliminated:
Imaging Unit
(page 8-6),
Fuser (page 8-9),
High Voltage Board
(page 8-57).
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