Uneven Density In Main Scan Direction - Epson AcuLaser C9200N Service Manual

EPSON AcuLaser C9200N
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UNEVEN DENSITY IN SUB SCAN DIRECTION
A. Typical Faulty Images
4036fs4043c0
B. Troubleshooting Procedure
Step Section Check Item
1 High image Uneven density in Sub Scan
density original Direction occurs at a pitch of
40 mm to 50 mm when a
multi-print cycle is run using
an original with high image
density (50% or more).
2 Photoconductor The surface of the PC Drum is
Unit scratched.
3 Dirty on the outside.
4 Developing bias contact
terminal makes good
connection.
5 PH Unit The surface of the PH
Window is dirty.
6 The problem has been
eliminated through the checks
of steps up to 5.
Troubleshooting
4036fs4044c0 4036fs4045c0
Result Action
YES Feed 10 to 20 blank sheets of
paper with no originals placed,
as the PU fails to keep up with
a high demand for toner.
YES Change Photoconductor Unit.
(p.162)
YES Clean.
YES Clean.
NO Change PH Unit. (p.175)
NO Change Photoconductor Unit.
→
Change PH Unit. (p.175)
→
Change Controller Board.
(p.198)
→
Change High Voltage Unit
(Image Transfer,
Neutralizing). (p.230)
Image quality problem
<MONOCOLOR>

UNEVEN DENSITY IN MAIN SCAN DIRECTION

A. Typical Faulty Images
4036fs4046c0
B. Troubleshooting Procedure
Step Section Check Item
1 Photoconductor The surface of the PC Drum is
Unit scratched.
2 Dirty on the outside.
3 PH Unit The surface of the PH
Window is dirty.
4 Transfer Belt Transfer Belt makes positive
Unit contact with plates on rails.
5 Cam gear operates properly.
6 The problem has been
eliminated through the checks
of steps up to 5.
Revision D
4036fs4047c0
Result Action
YES Change Photoconductor Unit.
YES Clean.
YES Clean with cleaning jig.
NO Check and correct contacts.
NO Change Transfer Belt Unit.
(p.162)
NO Change Photoconductor Unit.
→
Change PH Unit. (p.175)
→
Change High Voltage Unit
(Image Transfer,
Neutralizing). (p.230)
140
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