Copy Process - Minolta Di152 Service Manual

2.

COPY PROCESS

1. PC Drum
• Used as the medium on which a visible developed image of the original is formed.
2. Drum Charging
• A uniform negative DC charge is deposited across the entire surface of the PC Drum.
3. Photoelectric Conversion
• CCD converts the image data represented by light reflected off the original to a corre-
sponding electrical signal which, in turn, is output to IR image-processing section.
4. IR Image-Processing
• The electrical signal is converted to an 8-bit digital image signal (A/D conversion) which,
in turn, goes through appropriate correction before being output to the PH Image Pro-
cessing.
5. PH Image Processing
• After going through corrections, the digital image signal is converted to a corresponding
electrical signal (D/A conversion) that controls the intensity of the light from the laser
diode.
6. Laser Exposure
• The laser beam strikes the surface of the PC Drum, forming an electrostatic latent image.
7. Developing
• Toner negatively charged in the Developer Mixing Chamber is attracted onto the electro-
static latent image changing it to a visible, developed image.
• An AC/DC negative bias voltage is applied to the Sleeve/Magnet Roller to prevent toner
from being attracted onto those areas of the PC Drum which correspond to the back-
ground areas of the original.
8. Paper Feed
• Paper is fed from the drawer.
M-2
4021M065CB