Drum Surface Potential - Kyocera FS-1800 Service Manual

Drum surface potential

The laser beam is continually switched on and off depending on the print data. It is on for a black
(exposed) dot and off for a white (blank) dot. Since the drum surface is evenly charged, whenever
it is illuminated by the laser beam, the electrical resistance of the photoconductor is reduced and the
potential on the photoconductor is also lowered. Resulted on the drum surface is an electrostatic
image which represents the data to print. Note that the area to be printed black has the low potential,
constituting a "positively exposed" image.
FS-1800/1800N | FS-3800/3800N
Laser beam
a-Si layer
Aluminum base
Figure 4-1-8 Drum surface potential
Exposed surface potential
approximately 0 to +20 V
4-10
Charged surface potential
+230–15 V
Drum