Minolta EP3010 Manual page 327

5. Black Streaks or Bands
Cause Step
Uneven charging
Cleaning failure
PC Drum failure
PC Drum Paper
Separator Fingers
Fusing failure
Optical failure
6. Black Spots
Cause Step
PC Drum failure
Fusing failure
Developing failure
Dirty PC Drum
Paper Separator
Fingers
Check Item
Are the PC Drum Charge
Corona wire and grid mesh
1
dirty?
Is the Cleaning Blade dirty with
2 foreign matter, paper dust,
etc., or is it scratched?
Does the Cleaning Blade
3
make a correct lateral motion?
Is the PC Drum surface dirty or
4 scratched?
Are the PC Drum Paper Sepa-
5 rator Fingers dirty, deformed or
faulty in operation?
Is the Upper Fusing Roller
6
dirty or scratched?
Are the Upper Paper Separa-
7
tor Fingers dirty or deformed?
Is the mirror or lens dirty with
8
foreign matter?
Check Item
Is the PC Drum surface
1 scratched or dirty with foreign
matter?
Is the Upper Fusing Roller
2 dirty or scratched?
Is the amount of toner on the
3
Sleeve Roller proper?
Is the toner-to-carrier ratio rel-
4
atively high?
5 Is the Db value normal?
Is the Developer Scattering
6 Prevention Seal deformed or
dirty?
Are the PC Drum Paper Sepa-
7 rator Fingers dirty or
deformed?
T-90
Result Action
Clean or replace the PC Drum
Charge Corona.
YES
Check the operation of the
toner charging mechanism.
Replace the Cleaning Blade.
YES
Check the operation of the
NO
Cleaning Blade.
Replace the PC Drum. If nec-
YES essary, replace the Cleaning
Blade.
Clean or replace the PC Drum
YES Paper Separator Fingers.
Clean or replace the Upper
YES
Fusing Roller.
Clean or replace the Upper
YES
Paper Separator Fingers.
Clean the mirror or lens.
YES
Result Action
Clean or replace the PC Drum.
YES If necessary, replace the
Cleaning Blade.
Check the Fusing Thermistors.
YES Clean or replace the Upper
Fusing Roller.
Go to step 7
YES
Change the toner-to-carrier
YES
ratio.
NO Make Db adjustment.
Clean or replace the Devel-
YES oper Scattering Prevention
Seal.
Clean or replace the PC Drum
YES Paper Separator Fingers.