Phaser 6121MFP Service Manual 5-29
Print-Quality Troubleshooting
Uneven Pitch
The pitch along the feed direction is uneven or inconsistent.
Initial Actions
Perform the initial actions listed on page 5-5.
Troubleshooting Reference Table
Applicable Parts Example Print
■ Toner Cartridge
■ Imaging Unit,
PL4.0.13
■ Transfer Roller,
PL7.1.10
■ Fuser, PL11.0.18
Troubleshooting Procedure Table
Step Actions and Questions Yes No
1 Do faint lines occur at a
pitch of 25 mm in the
main scanning direction?
Allow the printer to
stand idle in an
environment free of
high humidity.
Go to step 2.
2 Inspect the toner
cartridge.
Is the drive mechanism
clean?
Are the cartridges for
each color in place?
Go to step 3. Clean the mechanism
and reinstall the
cartridge. If the
problem persists, go
to step 3.
3 Inspect the Laser Unit. Is
the unit secured in
position with the fixing
screw?
Go to step 4. Tighten the fixing
screw. If the problem
persists, go to step 4.
4 Inspect the Imaging Unit.
Is the photo-conductor
surface dirty or scratched?
Replace the Imaging
Unit (page 8-6). If
the problem persists,
go to step 5.
Go to step 5.
Repeating Light or Dark Lines
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