Minolta EP5000 - Page 389

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