Toshiba FC-22 manual Color banding in feeding direction Feeding direction

(14) Color banding (in feeding direction)

Feeding direction

Cause/Defect area	Step	Check items	Measures
Scanner	1	Foreign matter in optical path?	Clean slit, lens and mirrors.
Main charger grid	2	Foreign matter on grid?	Remove foreign matter.
	3	Grid dirty or deformed?	Clean or replace grid.
Main charger	4	Foreign matter on main charger?	Remove foreign matter.
	5	Charger wire dirty or deformed?	Clean or replace charger wire.
	6	Foreign matter inside charger case?	Remove foreign matter.
	7	Inner surface of charger case dirty?	Clean inside.
Cleaner	8	Paper dust on cleaning blade edge?	Clean or replace paper dust removal brush for reg-
			istration roller.
			Clean or replace cleaning blade.
	9	Cleaning blade contact improper?	Readjust cleaning blade contact.
	10	Toner recovery defective?	Clean toner recovery auger section.
Fuser unit	11	1. Dirt or scratches on fuser roller surface?	1. Clean or replace fuser roller.
		2. Thermistor cleaned at PM?	2. Clean thermistor.
Drum	12	Scratches on drum surface?	Replace drum.
Laser optical unit	13	Foreign matter or dust on slit glass?	Remove foreign matter or dust.
Shading correction plate	14	Dust or stain on shading correction plate?	Clean plate.

FC-22 TROUBLESHOOTING 4 - 70 January 2000 © TOSHIBA TEC