Minolta CF910 Service Manual page 20

1. PC Drum
• An electrostatic latent image is formed on the surface of a photoconductive material that
coats an aluminum cylinder.
• An OPC type photoconductor is used. (For details, see p. M-16.)
2. PC Drum Charging
A single-wire PC Drum Charge Corona employing the Scorotron system deposits a nega-
tive DC charge across the entire surface of the PC Drum. (For details, see p. M-19.)
3. Photoelectric Conversion
• The light from Exposure Lamp LA1 is directed onto the original and reflected to strike the
CCD Sensor through mirrors and lens, thereby forming a reduced image of the original.
• The CCD Sensor separates the light striking it into different colors using its color filters
(R, G, and B), then converts it into a corresponding electrical signal and outputs the sig-
nal to the IR Image Processing Unit. (For details, see p. M-23.)
4. IR Image Processing
The electrical signal output from the Photoelectric Converter is converted to 8-bit digital
image signals (R, G, and B). After making some corrections, the IR Image Processing Unit
outputs video signals (C, M, Y, and Bk) to the PH Image Processing Unit. (For details, see
p. M-23.)
5. PH Image Processing
The video signals (C, M, Y, and Bk) output from the IR Image Processing Unit go through
some corrections. Following digital-to-analog conversion, these signals are then used for
the control of the intensity level of the laser diode (LD1). (For details, see p. M-43.)
6. Laser Exposure
The laser beam emitted by the laser diode (LD1) strikes the surface of the PC Drum to form
an electrostatic latent image. (For details, see p. M-45.)
7. Developing
• The toner, agitated and negatively charged in the developing unit of each color, is
attracted onto the electrostatic latent image formed on the surface of the PC Drum,
changing it to a visible, developed image.
• AC and DC negative bias voltages are applied to the Sleeve/Magnet Roller to ensure
toner transfer to the PC Drum. (For details, see p. M-53.)
8. Pre-Image Transfer Erase
Light from Auxiliary Erase Lamp UN21 strikes the surface of the PC Drum to improve
image transfer efficiency and, at the same time, to neutralize negative charge on those
areas to which toner is not attracted. (For details, see p. M-54.)
9. Paper Feeding
Paper is fed from each drawer. (For details, see p. M-74.)
10. Manual Paper Feeding
The paper loaded in the Multi Bypass Table is fed. (For details, see p. M-78.)
M-3