Oki ES9160 Maintenance Manual page 754

8.4.13 Black banding (at right angle with the feeding direction)
Defective area
Main charger
Fuser unit
High-voltage transformer
(Main charger / Developer
bias / Transfer roller unit)
Drum
Scanner
ES9160 MFP / ES9170 MFP
ERROR CODE AND TROUBLESHOOTING
Fig.8-15
Step Check items
1 Is the needle electrode dirty or
deformed?
2 Are the fuser roller, separation finger
for fuser roller and thermistor dirty?
3 Has the fuser roller and separation
finger for fuser roller reached their
PM life?
4 Is the high-voltage transformer
output defective?
5 Is there a deep scratch on the drum
surface?
6 Is there thin scratch (drum pitting) on
the drum surface?
7 Is there a foreign matter on the
carriage rail?
8 - 274
Prescription
Clean or replace the needle
electrode.
Clean them.
Replace them.
Adjust the output, or replace the
transformer.
Replace the drum if the scratch has
reached the aluminum base.
Check and adjust the contact
condition of the cleaning blade and
recovery blade.
Remove the foreign matter.
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