Minolta Di251, Service Manual

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FrameMaker Ver5.5E(PC)Di251/Di351 MECHANICAL/ELECTRICAL
05.03.01
M-2
2. COPYING PROCESS
1. PC Drum
• Changes the image of the original projected onto the surface of the drum to a corre-
sponding electrostatic latent image.
2. Drum Charging
• Generates a negative DC charged layer on the surface of the PC Drum.
3. Photoelectric Conversion Section
• The CCD converts the light reflected off the original to a corresponding electrical signal
and outputs it to the IR image processing section.
4. MFB2 Board
• Converts the electrical signal to a corresponding 8-bit digital image signal, makes various
corrections, and outputs the results to the memory.
• Compresses and stores in memory the digital image signal, and then outputs it to the PH
image processing section.
• After going through necessary corrections, the digital image signal is converted to a cor-
responding analog signal, based on which the intensity of the laser light is controlled.
5. Laser Exposure
• A laser beam strikes the surface of the PC Drum, creating an electrostatic latent image.
6. Development
• Negatively charged toner adheres to the latent image on the PC Drum surface, creating a
visible image.
• AC/DC negative bias voltages are applied to the Sleeve/Magnet Roller, thereby prevent-
ing toner from sticking to the background.
• Toner scraped off by the cleaning mechanism is recycled.
7. Paper Feed
• Feeds sheets of paper from the appropriate paper source.
8. Manual Bypass
• Feeds sheets of paper from the Manual Bypass Tray.
9. Image Transfer
• A positive charge is applied to the Image Transfer Roller to transfer the visible image on
the surface of the PC Drum onto the paper.
10. Paper Separation
• The PC Drum Separator Fingers remove paper from the surface of the PC Drum.
4. MFB2 Board
1. PC Drum
10. Paper Separation
9. Image Transfer
8. Manual Bypass
6. Development
2. Drum Charging
11. Cleaning
13. Fusing
7. Paper Feed
3. Photoelectric Conversion Section
12. Erase
5. Laser Exposure
14. Paper Exit