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e-STUDIO160/200/250 TROUBLESHOOTING 4 - 66 December 2002 TOSHIBA TEC
(8) Black banding (at right angles to feeding direction)
Step
1
2
3
4
5
6
Cause/Defect area
Process unit
(main charger)
Process unit (Drum)
Fuser unit
HVPS (main charger/trans-
fer charger)
Measures
Clean main charger wire, replace process unit
or charger wire.
Clean terminals.
Replace process unit or drum.
Clean or replace heat roller?
Adjust output from HVPS, or replace defec-
tive HVPS.
Replace process unit or fuser unit.
Check items
Main charger wire dirty or de-
formed?
Charger wire terminals/grid termi-
nals (process unit) and corre-
sponding terminals (main body)
stained?
Deep scratch on drum surface?
Dirt or scratches on heat roller
surface?
High-voltage output defective?
If problem persists after measures
are applied, or there is no prob-
lem found in above check, follow
procedure described in right col-
umn.
Feeding direction