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January 2000 © TOSHIBA TEC 4 - 67 FC-22 TROUBLESHOOTING
Cause/Defect area
Step
Check items Measures
Laser optical unit
Main charger grid
Developer unit
Drum
Transport path
Discharge LED array
Scanner
1 Foreign matter or dust on slit glass?
2 Foreign matter on charger grid?
3 Foreign matter in developer unit?
4 Foreign matter on drum seal?
5 Drum seal of developer unit in proper con-
tact with drum?
6 Any abnormalities on drum surface?
7 Does toner image touch foreign matter af-
ter transfer, before entering fuser unit?
8 Any lamp of discharge LED array gone out?
9 Foreign matter or dust in optical path?
Clean slit glass.
Remove foreign matter.
Remove foreign matter.
Remove foreign matter.
Modify position of drum seal or replace it.
Replace drum.
Remove foreign matter.
Replace discharge LED array.
Clean lens and mirrors.
(11) White banding (in feeding direction)
Feeding direction