Read Sharp AR-651 (serv.man7) Service Manual online
AR-651/810 COPY PROCESS 3 - 4
(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).
OPC layer
Carrier (always attracted
onto the magnet)
onto the magnet)
Drum
Magnetic roller
Magnet
Magnetic roller
Toner
Toner
Bias voltage
–500 VDC
–500 VDC
OPC
drum
drum
Aluminum conductive
base
base
Toner
(4) Writing
Writing is a process of converting the image signals
sent from the image processing section into optical
signals and exposing the drum surface to the light.
Semiconductor laser elements convert image sig-
nals sent from the image processing section into
optical signals (laser emission) and exposes the
drum surface to the light to form an electrostatic
latent image on it.
Image
processing
section
Laser Drive
board
Semiconduc-
tor laser
element
Polygonal mirror
Photo-
conductive
drum
0
– 100V
– 200V
– 300V
– 400V
– 700V
– 500V
– 600V
Toner amount
applied to the
OPC drum’s
surface
applied to the
OPC drum’s
surface
White background
Half tone
Solid
White background
Image not developed
Bias
potential
potential
Image is developed by
toner
toner
The (–) potential
of the drum being
higher than the
developer bias
of the drum being
higher than the
developer bias
The (–) potential
of the drum being
lower than the
developer bias
of the drum being
lower than the
developer bias
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