Operation; Image Transfer Section; Paper Separation Section - Konica Minolta bizhub 169 Service Manual

14. Image transfer and paper separation section

14.3 Operation

14.3.1

Image Transfer Section

• A positive charge is applied to the Image Transfer Roller to transfer the toner image
formed on the surface of the PC Drum onto the paper.
• The charge applied to the Image Transfer Roller is varied according to the following con-
ditions to ensure that image transfer efficiency is stabilized.
1. Paper Type: The amount of charge is made less for OHP film.
2. Paper width: The smaller the paper width, the greater the amount of charge.
3. B/W ratio of image: The lower the B/W ratio, the greater the amount of charge.
• A negative charge is applied to the Image Transfer Roller to return toner sticking to the
Image Transfer Roller to the PC Drum. It is performed in the following timings:
(At the start and end of a copy cycle; when the Power Switch is turned ON; when a mis-
feed or malfunction is reset)
14.3.2

Paper Separation Section

• Paper separation is accomplished through the curvature separation system that works
on the diameters of the PC Drum and the Image Transfer Roller.
Since the PC Drum has a small diameter, there is no likelihood that the paper will be
wound around the PC Drum. The paper is separated by its own weight.
• The Charge Neutralizing Plate neutralizes any charge left on the paper after image trans-
fer, thereby preventing discharge noise that could otherwise occur when the paper is
separated.
• The PC Drum Paper Separator Fingers properly separate from the surface of the PC
Drum thin paper or other type of paper that is hard to separate.
PC Drum
38
Image Transfer Roller
Theory of Operation Ver. 1.0 Apr. 2007
PC Drum Paper Separator Fingers
Charge Neutralizing Plate
A08EC531AA