Image Creation Process - Konica Minolta magicolor 4690MF Service Manual

Theory of operation Ver. 1.0 May 2008
5.

Image creation process

CCD (Photoelectric conversion)
Image processing board
Transfer belt cleaning
[1]
CCD (Photoelectric
conversion)
[2]
Image processing board
[4] PC drum
[5] PC drum charging
[6] LD exposure
[7] Developing
[8] 1st image transfer
[9] 2nd image transfer
[10] Media separation
[11] Transfer belt cleaning
[12] PC drum cleaning
1st image transfer
PC drum
PC drum charging
• Light reflected off the surface of the original is converted to a corre-
sponding electric signal by CCD and the resultant electric signal is
sent to the image processing board.
• The intensity of the laser light is controlled based on the image sig-
nal transmitted to this board.
• The image of the original projected onto the surface of the PC drum
is changed to a corresponding electrostatic latent image.
• Apply DC (-) charge to the photo conductor.
• The surface of the PC drum is irradiated with laser light, and an
electrostatic latent image is thereby formed.
• The toner, agitated and negatively charged in the toner chamber, is
attracted onto the electrostatic latent image formed on the surface
of the PC drum. It is thereby changed to a visible, developed image.
• A DC positive voltage is applied to the backside of the transfer belt,
thereby allowing the visible, developed image on the surface of
each of the PC drums (Y, M, C and K) to be transferred onto the
transfer belt.
• A DC positive voltage is applied to the backside of the media,
thereby allowing the visible, developed image on the surface of the
transfer belt to be transferred onto the media.
• The media, which has undergone the 2nd image transfer process,
is neutralized so that it can be properly separated from the transfer
belt.
• The residual toner left on the surface of the transfer belt is scraped
off.
• The residual toner left on the surface of the PC drum is scraped off.
5. Image creation process
Media separation
2nd image transfer
LD exposure
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