Copy Process - Konica Minolta bizhub 169 Service Manual

Theory of Operation Ver. 1.0 Apr. 2007
5.

Copy process

[1] Photoelectric
Conversion
IR Image
[2]
Processing
PH Image
[3]
Processing
Laser Exposure
[6]
Photoelectric
[1]
Conversion
IR Image
[2]
Processing
PH Image
[3]
Processing
PC Drum
[4]
Drum Charging
[5]
Laser Exposure
[6]
Developing
[7]
Paper Feed
[8]
Image Transfer
[9]
Paper Exit
[14]
Cleaning
[11]
Main Erase
[12]
Drum Charging
[5]
Developing
[7]
• 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 processing section.
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.
After going through corrections, the digital image signal is con-
•
verted to a corresponding electric signal (D/A conversion), with
which the laser is turned ON or OFF as necessary.
Made up of an aluminum pipe coated with a photoconductive
•
layer, on which an electrostatic latent image is formed.
A uniform negative DC charge is deposited across the entire
•
surface of the PC Drum.
The laser beam strikes the surface of the PC Drum, forming an
•
electrostatic latent image.
• Toner negatively charged in the Developer Mixing Chamber is
attracted onto the electrostatic latent image changing it to a vis-
ible, 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.
Paper is supplied from the paper feed tray.
•
A DC positive charge is applied to the Image Transfer Roller to
•
transfer the visible image on the surface of the PC Drum onto
the paper.
5. Copy process
Fusing
[13]
PC Drum
[4]
Paper Separation
[10]
Image Transfer
[9]
Paper Feed
[8]
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