Toshiba e-STUDIO 550, Service Manual

Page: 48 / 346

e-STUDIO550/650/810 COPY PROCESS 3 - 4 JUNE 2002 © TOSHIBA TEC
(5) Development
Development is a process of making the electro-
static latent images visible to the eye (visible im-
ages).
Developer material is supplied to the photoconduc-
tive drum surface by 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 development method).
Photoconductive layer
The (–) potential
of the drum being
higher than the
developer bias
The (–) potential
of the drum being
lower than the
developer bias
Carrier (always attracted
onto the magnet)
White background Half tone Solid
Drum Magnetic roller
0
– 100V
– 200V
– 300V
– 400V
– 700V
– 500V
– 600V
White background Image not developed
Bias
potential
Magnet
Magnetic roller
Toner
Toner
Bias voltage
–500 VDC
Photocon-
ductive
drum
Aluminum conductive
base
Toner
Image is developed by
toner