Toshiba e-STUDIO555 Service Manual page 88

(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 element converts image signals 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.
(5) Development
Development is a process of making the electrostatic latent images visible to the eye (visible
images).
Developer material is supplied to the photoconductive 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).
Drum Magnetic roller
Fig. 3-8
e-STUDIO555/655/755/855
COPY PROCESS
Image
processing
section
Polygonal mirror
Photo-
conductive
drum
Fig. 3-7
Magnetic roller
Bias voltage
-394V
(-200 to -800V) DC+AC
Photoconductive
drum
3 - 4
Laser driving
PC board
Semiconductor
laser element
Magnet
Toner
Carrier ( always attracted
onto the magnet )
Toner
Toner
Fig. 3-9
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Photoconductive layer
Aluminum conductive
base