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December 2002 TOSHIBA TEC 4 - 67 e-STUDIO160/200/250 TROUBLESHOOTING
(9) White Spots
Step
1
2
3
4
5
6
7
8
9
Cause/Defect area
Transfer charger unit
Process unit (drum)
Fuser unit
Process unit (Developer)
HVPS (main charger/
developer bias/transfer
charger)
Measures
Clean guide roller.
Ground guide roller shaft properly by apply-
ing conductive oil.
Replace transfer charger unit.
Replace transfer charger unit.
Replace process unit or drum.
Clean heat roller. If problem persists, replace
heat roller.
Check to see toner sensor works properly, and
then check toner replenishing procedure.
Adjust output from HVPS, or replace defec-
tive HVPS.
Replace process unit, transfer unit, fuser unit,
or HVPS.
Check items
Foreign matter on guide roller?
Guide roller shaft grounded
improperly?
Transfer charger wire slacked?
Transfer charger case deformed?
Any abnormalities on drum sur-
face?
Toner on heat roller surface?
Scratches on heat roller surface?
Is toner running short?
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