Copy Process; Copy Process Overview - Konica Minolta BIZHUB 162 Service Manual

Theory of Operation Ver. 1.0 Apr. 2005
5.

Copy process

5.1

Copy Process Overview

1. PC Drum
• Made up of an aluminum pipe coated with a photoconductive layer, on which an electro-
static latent image is formed.
2. Drum Charging
• A uniform negative DC charge is deposited across the entire surface of the PC Drum.
3. Photoelectric Conversion
• A CCD sensor is used to convert the image data represented by light reflected off the
original to a corresponding electric signal which, in turn, is output to the IR image pro-
cessing section.
4. IR Image Processing
• The analog electric signal is converted to an 8-bit digital image signal (A/D conversion)
which, in turn, goes through appropriate corrections before being output to the PH image
processing section.
5. PH Image Processing
• After going through corrections, the digital image signal is converted to a corresponding
electric signal (D/A conversion), with which the laser is turned ON or OFF as necessary.
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 (Vb) is applied to the Developing Roller to prevent toner from being
attracted onto those areas of the PC Drum which correspond to the background areas of
the original.
8. Paper Take-up
• Paper is supplied from the paper feed tray.
9. Bypass Paper Take-up
• Paper is supplied by way of the Manual Bypass, one sheet at a time.
• The optional Multiple Bypass (MB-501), when mounted on the copier, permits continu-
ous paper supply.
5. Copy process
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