Functions - Toshiba e-STUDIO453 Service Manual

11.2 Functions

(1) Drum
The drum is made of a cylindrical aluminum base coated with thin film of organic photoconductive
substance.
The photoconductive object becomes insulative (the electrical resistance is high) when it is not
exposed to the light and electrically conductive (the electrical resistance is low) when it is ex-
posed to the light. This object is called a photoconductor.
(2) Main charger
The main charger consists of a metal rod with U-shaped section, insulated blocks at both ends of
the rod and charger wire attached between them.
When a high voltage is applied to the charger wire, the air around it is charged (ionized). The ion-
ized air then flows into the drum causing it to be charged. This phenomenon is called "corona dis-
charge". Negative charge caused by the corona discharge and grid is applied to the drum surface
evenly in dark place. The main charger is equipped with a wire cleaner to clean the wire.
(3) Cleaner
(a) Cleaning blade
This blade is pressed against the drum surface with a constant force by the pressure springs,
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and scrapes off the residual toner from the drum surface.
(b) Recovery blade
This blade catches the toner scraped off by the cleaning blade.
(c) Toner recovery auger
This auger carries the residual toner scraped off to the toner bag.
(d) Toner bag full detection sensor -1
The sensor detects the toner bag full when t s pushed by the toner recovery auger n the
cleaner whch s gven a pressure from the used toner n the toner bag.
e-STUDIO350/352/353/450/452/453
DRUM RELATED SECTION
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