16. Image quality problem
Field Service Ver. 1.0 May 2006
216
magicolor 7450
T
roubleshooting
16.3.2
Monocolor: white lines in Main Scan Direction, white bands in Main Scan
Direction, colored lines in Main Scan Direction, colored bands in Main
Scan Direction
A. Typical Faulty Images
B. Troubleshooting Procedure
White lines in Main
Scan Direction
White bands in Main
Scan Direction
Colored lines in Main
Scan Direction
Colored bands in Main
Scan Direction
4036fs4025c0
4036fs4026c0
4036fs4027c0
4036fs4028c0
Step
Section
Check Item
Result
Action
1
Imaging Unit The surface of the PC Drum is
scratched.
YES
Change Imaging Unit.
2
Dirty on the outside.
YES
Clean.
3
Contact terminals make good con-
nection between each IU and
machine.
NO
Clean contact terminals.
4
Developing bias contact terminal
makes good connection.
NO
Clean contact terminal and check ter-
minal position.
5
PH Unit
The surface of the PH Window is
dirty.
YES
Clean with cleaning jig.
6
The problem has been eliminated
through the checks of steps up to 6.
NO
Change Imaging Unit.
→
Change Transfer Belt.
→
Change PH Unit.
Summary of Contents for magicolor 7450
Page 1: ...SERVICE MANUAL 2006 05 2006 05 Ver 1 0 Ver 1 0 FIELD SERVICE magicolor 7450 magicolor 7450 ...
Page 3: ...ii Blank Page ...
Page 26: ...SERVICE MANUAL 2006 05 Ver 1 0 FIELD SERVICE Main Unit magicolor 7450 magicolor 7450 ...
Page 43: ...2 Product specifications Field Service Ver 1 0 May 2006 6 magicolor 7450 General Blank Page ...
Page 288: ...SERVICE MANUAL 2006 05 Ver 1 0 FIELD SERVICE Lower Feeder Unit ...
Page 317: ...3 Other Field Service Ver 1 0 May 2006 26 Lower Feeder Unit Maintenance Blank Page ...
Page 328: ...SERVICE MANUAL 2006 05 Ver 1 0 FIELD SERVICE Duplex Option ...
Page 333: ...1 Product specifications Field Service Ver 1 0 May 2006 2 Duplex Option General Blank Page ...
Page 345: ...6 Jam Display Field Service Ver 1 0 May 2006 14 Duplex Option Troubleshooting Blank Page ...