Toshiba e-STUDIO453 Service Manual page 86

(5) Development
Development is the process of making the elec-
trostatic latent images visible to the eye (visible
images).
3
Developer material is supplied to the photocon-
ductive drum surface by the magnetic roller.
The toner in the developer material adheres to
the areas on the drum surface where the poten-
tial is lower than the developer bias which is
applied to the magnetic roller (reverse develop-
ment method).
Magnetic roller
Bias voltage
–550 VDC
Photoconduc-
tive drum
e-STUDIO350/352/353/450/452/453
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 devel-
oper bias.
The (–) potential of the
photoconductive drum
is lower than the devel-
oper bias.
Magnetic roller
Fig. 3-207
White background
White background
– 00V 750V
– 400V 550V
– 300V
– 200V
– 00V
0
Fig. 3-209
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Drum
Halftone Solid
Image not developed
Bias poten-
tial
Image developed by toner