Toshiba e-STUDIO2500c Service Manual page 86

5) Development
Development is a process of making the electrostatic latent images visible to the eye (visible image).
Developer material is supplied to the photoconductive drum surface by means of a magnetic roller,
allowing the toner in the developer material to adhere to the areas on the drum surface where the
potential is lower than the developer bias which is applied to the magnetic roller (reverse develop-
ment).
Drum Magnetic roller
Fig. 3-10
When the (–) potential of
the photoconductive
drum is higher than
the developer bias.
When the (–) potential of
the photoconductive
drum is lower than
the developer bias.
e-STUDIO2500c/3500c/3510c COPY PROCESS
Magnetic roller
Bias voltage
-400V (-200 to -900V) DC
1100V / 7.5 to 10kHz AC
Photocon-
ductive drum
White background
White background
- 500V
- 400V
- 300V
- 200V
- 100V
0
Fig. 3-12
3 - 6
Toner
Carrier (always attracted
onto the magnet)
Toner
Photoconductive layer
Aluminum base
Fig. 3-11
Halftone Solid
Image is not
developed
Image is developed by
toner
Toner
Bias
voltage
May 2006 © TOSHIBA TEC