Image Creation Process - Konica Minolta magicolor 1690MF Service Manual

5. Overall composition
5.2

Image creation process

[1] Printer image processing
Printer image
[1]
processing
[2] Photo conductor
Photo conductor
[3]
charging
[4] Laser exposure
[5] Developing
[6] 1st image transfer
[7] 2nd image transfer
[8] Media separation
[9] Transfer belt cleaning
Photo conductor
[10]
cleaning
16
[9] Transfer belt cleaning
[6] 1st image transfer
[2] Photo
conductor
[5] Developing
[3] Photo conductor charging
[4] Laser exposure
• The intensity of the laser light is controlled by the image signal sent
from the host computer.
• The image projected onto the surface of the photo conductor is con-
verted to a corresponding electrostatic latent image.
• A negative DC charge layer is formed on the surface of the photo
conductor.
• The surface of the photo conductor is irradiated with the laser light
and an electrostatic latent image is thereby formed.
• The toner, negatively charged in the Hopper, is attracted onto the
electrostatic latent image formed on the surface of the photo conduc-
tor. It is thereby changed to a visible, developed image.
• A DC negative bias voltage is applied to the Developing roller,
thereby preventing toner from sticking to the background image por-
tion.
• A DC positive voltage is applied to the backside of the transfer belt,
thereby allowing the visible, developed image on the surface of the
photo conductor 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.
• A charge is applied to the transfer belt. By potential difference, resid-
ual toner on the surface of the transfer belt is collected for cleaning.
• The residual toner left on the surface of the photo conductor is
scraped off.
Theory of Operation Ver. 1.0 Nov. 2008
[8] Media separation
[7] 2nd image transfer
[10] PC drum cleaning
A00VT1C005AA