Toshiba e-STUDIO520 Service Manual page 81

The (-) potential of
the photoconductive
drum being higher than
the developer bias.
The (-) potential of
the photoconductive
drum being lower than
the developer bias.
• Developer material
The developer material is a mixture of toner and carrier. The toner is charged to negative polarity
and the carrier to positive polarity, due to the friction with each other caused by mixing.
Toner: Mainly consists of resin and carbon.
Carrier: Consists of ferrite and resin coating on its surface to provide consistent frictional
electrification.
March 2005 © TOSHIBA TEC
White background
White background
- 450V
- 394V
- 250V
- 100V
0
Fig.3-10
Carbon
( 5-10% )
5-20 µm
Resin ( 90-95% )
[ Toner ]
Fig.3-11
3 - 5
Half tone Solid
Image not developed
Bias
potential
Image developed by
toner
Ferrite
30-100 µm
[ Carrier ]
e-STUDIO520/600/720/850 COPY PROCESS
3