Epson Aculaser C9200N, Руководство по обслуживанию, Страница: 140 / 441

EPSON AcuLaser C9200N Revision D
Troubleshooting Image quality problem 140
Confidential
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UNEVEN DENSITY IN SUB SCAN DIRECTION
A. Typical Faulty Images
B. Troubleshooting Procedure
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UNEVEN DENSITY IN MAIN SCAN DIRECTION
A. Typical Faulty Images
B. Troubleshooting Procedure
Step Section Check Item Result Action
1 High image
density original Uneven density in Sub Scan
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). 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.
2 Photoconductor
Unit The surface of the PC Drum is
scratched. YES Change Photoconductor Unit.
(p.162)
3 Dirty on the outside. YES Clean.
4 Developing bias contact
terminal makes good
connection. YES Clean.
5 PH Unit The surface of the PH
Window is dirty. NO Change PH Unit. (p.175)
6 The problem has been
eliminated through the checks
of steps up to 5. NO Change Photoconductor Unit.
→
Change PH Unit. (p.175)
→
Change Controller Board.
(p.198)
→
Change High Voltage Unit
(Image Transfer,
Neutralizing).
(p.230)
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Step Section Check Item Result Action
1 Photoconductor
Unit The surface of the PC Drum is
scratched. YES Change Photoconductor Unit.
2 Dirty on the outside. YES Clean.
3 PH Unit The surface of the PH
Window is dirty. YES Clean with cleaning jig.
4 Transfer Belt
Unit Transfer Belt makes positive
contact with plates on rails. NO Check and correct contacts.
5 Cam gear operates properly. NO Change Transfer Belt Unit.
(p.162)
6 The problem has been
eliminated through the checks
of steps up to 5. NO Change Photoconductor Unit.
→
Change PH Unit. (p.175)
→
Change High Voltage Unit
(Image Transfer,
Neutralizing).
(p.230)
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