Scanner Unit - Kyocera Mita FS-6750 Service Manual

Operation theory
Electrophotographics system
The laser beam is switched on for a black dot and off for a white (blank) dot accord-
ing to the print data. Whenever it is illuminated by the laser beam, the electrical
resis-tance of the photoconductor is reduced, the potential on the photoconductor is
also lowered to 70-100 V, effectively driving the charge through the OPC layer
down to the aluminum base.
OPC layer
Aluminum

Scanner unit

The 600 dpi scanner unit includes the diode laser that produces the 780 nm wave-
length laser beam. This wavelength is specifically designed to match the photocon-
ductive response of the OPC drum.
FS-6750
Laser beam
Positive chg.
Positive chg.
Negative chg.
240-260V
415-465 V
70-100 V
0 V
4-5
Laser beam