Toshiba e-STUDIO556 Service Manual page 802

8.4.12 Black banding (in the feeding direction)
Defective area
Scanner
Shading correction plate
Main charger
Drum
Laser optical unit
Cleaner
Fuser unit
e-STUDIO556/656/756/856/557/657/757/857
ERROR CODE AND TROUBLESHOOTING
Fig. 8-12
Step Check items
1 Is there a foreign matter on the light
path?
2 Is there dust or stains on part of the
original glass where the shading
correction plate is placed.
3 Is there a foreign matter or stain on
the charger grid, or in the main
charger case?
4 Is the main charger grid deformed?
5 Is there a foreign matter on the main
charger grid?
6 Are there scratches on the drum
surface?
7 Is there a foreign matter or stain on
the 2 slit glasses?
8 Is the inside of the main charger case
dirty?
9 Is there paper dust sticking to the
drum cleaning blade edge?
10 Does the drum cleaning blade work
smoothly?
11 Has the used toner been recovered
properly?
12 Is the fuser roller surface dirty or
damaged?
13 Is the fuser roller thermistor dirty?
8 - 250
Prescription
Clean the slit, lens and mirrors.
Clean the plate.
Remove the foreign matter or stain.
Replace the main charger grid.
Remove the foreign matter.
Replace the drum.
Remove the foreign matter or the
stain.
Clean the inside of the main charger
case.
Clean or replace the cleaning blade.
Push the cleaning blade by hand. If
its move is not smooth enough, clean
the section where the blade is
installed, then install it again.
Clean the toner recovery auger.
Clean or replace the fuser roller.
Clean the fuser roller thermistor.
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