Black Bands In The Fd And Cd - Minolta CF910 Service Manual

(5) Black Bands in the FD and CD

Black Bands in the FD
<Troubleshooting Procedure>
Cause Step
1
Defective IR 2
3
Defective PC 4
Drum
Defective PC 5
Drum Charge
Corona
6
Defective 7
Cleaning Unit
8
Others 9
Defective IR 10
Defective 11
Developing
Unit
1144T009AA
Check Item
Does the image problem occur
in the FD?
Is the value for the "Left
Image" within the correct
range?
Are the connectors on PWB-A,
-B, and -C connected prop-
erly?
Is the surface of the PC Drum
dirty or scratched?
Are the Corona Wire and
Meshes dirty or deteriorated?
Does the Corona Wire Cleaner
operate properly?
Is the Cleaning Blade warped
or deteriorated?
Are the side seals deterio-
rated?
Is the Main Erase Lamp dirty
or deteriorated?
Is the value for the "Top Image"
within the correct range?
Is the developing bias being
output properly?
T-61
Black Bands in the CD
1144T010AA
Result Action
NO Go to step 10.
NO Readjust.
NO Reconnect the connectors.
YES Change the PC Drum.
Change the Cleaning Blade
if necessary. ("AIDC Mode/
AIDC Offset" and "Grada-
tion Adjust")
YES Clean or change the
Corona Wire and Meshes.
NO Check the wiring between
PWB-I and M3 and, if it is
intact, change M3.
YES Change the Blade. Change
the PC Drum if necessary.
YES Change the side seals.
YES Clean or replace the Main
Erase Lamp.
NO Readjust.
NO Check the wiring between
PWB-I and HV4 and, if it is
intact, change HV4.