Konica Minolta A0XY026, Service Manual

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Theory of Operation Ver. 1.0 Apr. 2005 6. Operating Sequence
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Composition/Operation
6. Operating Sequence
6.1 Copy Process
1. PC Drum
• A photoconductive layer is formed on an aluminum tube and an electrostatic latent image
is formed on this photoconductive layer.
2. PC Drum Charging
• Deposits a negative DC charge across the entire surface of the PC Drum.
3. Photoelectric Conversion
• The CCD Sensor converts the image data represented by light reflected off the original
to a corresponding analog electric signal which, in turn, is output to the IR image pro-
cessing section.
4. IR Image Processing
• The electric signal is converted to an 8-bit digital image signal (A/D conversion) which, in
turn, goes through appropriate correction processes before being output to the PH image
processing section.
5. PH Image Processing
• After going through correction processes, the digital image signal is converted to a corre-
sponding electric signal (D/A conversion), based on which control is provided for turning
ON or OFF the laser.
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.
• A developing bias voltage (Vb) is applied to the Sleeve Roller to prevent toner from being
attracted onto those areas of the PC Drum that correspond to the background areas of
the original.
8. Paper Feed
• Paper is fed from Tray 1.
9. Bypass Paper Feed
• Paper is fed from the Multiple Bypass Tray.
4980M018AC
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