Minolta EP5000 General, Mechanical/Electrical page 389

Interleaf EP5000/EP4000 TROUBLESHOOTING
97.04.01
1149SBT050305A
5) Black Streaks or Bands
Cause Step
Uneven charging
1
Cleaning failure
2
3
PC Drum failure
4
PC Drum Paper
Separator Fingers
5
Fusing failure
6
7
Optical failure
8
1149SBT050306A
6) Black Spots
Cause Step
PC Drum failure
1
Fusing failure
2
Developing failure
3
4
5
6
Dirty PC Drum Pa-
per Separator Fin- 7
gers
Check Item Result
Are the Comb Electrode
and grid mesh dirty?
Is the Cleaning Blade dirty
with foreign matter, paper
dust, etc., or is it
scratched?
Does the Cleaning Blade
make a correct lateral mo-
tion?
Is the PC Drum surface
dirty or scratched?
Are the PC Drum Paper
Separator Fingers dirty, de-
formed or faulty in opera-
tion?
Is the Upper Fusing Roller
dirty or scratched?
Are the Upper Paper Sepa-
rator Fingers dirty or de-
formed?
Are the mirrors and lenses
dirty with foreign matter?
Check Item Result
Is the PC Drum surface
scratched or dirty with for-
eign matter?
Is the Upper Fusing Roller
dirty or scratched?
Is the amount of toner on
the Sleeve Roller proper?
Is the toner-to-carrier ratio
relatively high?
Is the Db value normal?
Is the Developer Scattering
Prevention Seal deformed
or dirty?
Are the PC Drum Paper
Separator Fingers dirty or
deformed?
T-114
Action
Clean or replace the PC
Drum Charge Corona.
YES
Check the toner suction
mechanism for operation.
Change the Cleaning
Blade.
YES
Check the Cleaning Blade
NO for operation.
Change the PC Drum. If
YES necessary, change the
Cleaning Blade.
Clean or replace the PC
Drum Paper Separator Fin-
YES
gers.
Clean or replace the Upper
YES
Fusing Roller.
Clean or replace the Upper
YES Paper Separator Fingers.
Clean the mirrors and
YES
lenses.
Action
Clean or change the PC
YES Drum. Change the Cleaning
Blade if necessary.
Check the Fusing Thermis-
tors. Clean or change the
YES
Upper Fusing Roller.
Go to step 5.
YES
Change the toner-to-carrier
YES
ratio.
NO Make Db adjustment.
Clean or change the Devel-
YES oper Scattering Prevention
Seal.
Clean or change the PC
YES Drum Paper Separator Fin-
gers.