Copy Process - Minolta Di450 Service Manual

2.

COPY PROCESS

3. Photoelectric
Conversion
17. Exit/Turnover
Switching
18. Turnover
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 memory.
5. Memory
• The digital image signal is compressed and stored in memory. It is then output to the PH
image-processing section.
6. 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.
7. Laser Exposure
• The laser beam strikes the surface of the PC Drum, forming an electrostatic latent image.
8. 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.
9. Paper Feeding
• Paper is fed from the drawer.
4. IR Image-
Processing
14. Main
Erase
13. Cleaning
16. Fusing 15. Transport
19. Duplex Unit
M-2
6. PH Image-
5. Memory
Processing
7. Laser
2. Drum
Exposure
Charging
1. PC Drum
11. Image
12. Paper
Transfer
Separation
8. Developing
10. Bypass
Paper Feeding
9. Paper
Feeding
4002M502CA