Toshiba e-STUDIO350 Service Manual page 72

(5) Development
Development is the process of making the
electrostatic latent images visible to the eye
(visible images).
3
Developer material is supplied to the photo-
conductive drum surface by the magnetic roller.
The toner in the developer material adheres
to the areas on the drum surface where the
potential is lower than the developer bias which
is applied to the magnetic roller (reverse de-
velopment method).
Magnetic roller
Bias voltage
–550 VDC
Photocon-
ductive
drum
e-STUDIO350/450 COPY PROCESS
Magnet
Toner
Carrier (always attracted
onto the magnet)
Toner
Toner
Photoconductive layer
Aluminum base
Fig.3-208
The (–) potential of
the photoconductive
drum is higher than
the developer bias.
The (–) potential of
the photoconductive
drum is lower than
the developer bias.
Magnetic roller
Fig.3-207
White background
White background
750V
– 600V
550V
– 400V
– 300V
– 200V
– 100V
0
Fig.3-209
3 - 4
Drum
Solid
Halftone
Image not developed
Bias
potential
Image developed by
toner
November 2003 © TOSHIBA TEC