White Lines In The Fd And Cd - Minolta CF910 Service Manual

4-3. Troubleshooting Procedure by a Particular Image Quality
Problem

(1) White Lines in the FD and CD

White Lines in the FD
<Troubleshooting Procedure>
Cause Step
1
Defective IR 2
3
4
Defective PH 5
6
Defective 7
Developing
Unit
Defective PC 8
Drum
Defective PC 9
Drum Charge
Corona
10
11
1144T002AA
Check Item
Does the image problem occur
in the FD?
Is the shading sheet dirty?
Are the lens, mirror, and Origi-
nal Glass dirty?
Are the connectors on PWB-A,
-B, and -C connected prop-
erly?
Is the window of the PH Lower
Unit dirty?
Is there any foreign matter in
the light path between the PH
and PC Drum?
Is the gap between the Doctor
Blade and Sleeve Roller
plugged with foreign matter or
toner?
Is the surface of the PC Drum
dirty or scratched?
Are the Corona Wire, Meshes
and Pre-Cleaner Charge
Corona dirty or deteriorated?
Is the Ozone Filter dirty?
Does M5 turn properly?
T-55
White Lines in the CD
1144T003AA
Result Action
NO Go to step 12.
YES Clean the sheet.
YES Clean these surfaces.
NO Reconnect the connectors.
YES Clean the window. ("Gra-
dation Adjust")
YES Remove the foreign matter.
YES Remove the foreign mat-
ter. If the problem recurs,
change the developer.
("Developer" and "Grada-
tion Adjust")
YES Change the PC Drum.
Change the Cleaning Blade
if necessary.
("AIDC Mode/AIDC Offset"
and "Gradation Adjust")
YES Clean or change the
Corona Wire, Meshes and
Pre-Cleaner Charge
Corona.
YES Change the filter.
NO Check the wiring between
PWB-I and M19 and, if it is
intact, change M5.