12-3.Developing Bias - Minolta Di152 Service Manual

12-2. Sleeve/Magnet Roller
• The Sleeve/Magnet Roller, which consists of an outer sleeve roller and an inner magnet
roller, conveys developer to the point of development.
• The magnetic force of the magnet roller at the point of development is the strongest so
that the developer brush stands straight up to deliver the greatest amount of toner to the
point of development.
1171M027AA
12-3. Developing Bias
• Vb (-DC, AC) is applied to the Sleeve/Magnet Roller.
• Vb (-DC) is applied to prevent toner from sticking to the background of the image.
• Vb (AC) is applied to enhance good separation of toner from carrier.
• The amount of toner sticking to the surface of the PC Drum is varied according to the dif-
ference in potential between the voltage (Vi) on the surface of the PC Drum and
Vb (-DC).
Large difference = A greater amount of toner sticks.
Small difference = A smaller amount of toner sticks.
Sleeve/Magnet Roller
Elevtrical Component
Vb (-DC)
Vb (AC)
Sleeve/Magnet Roller
4021M062AA
Control Signal
PWB-A PJ8A-9
PWB-A PJ8A-10
M-22
Sleeve/Magnet Roller
1st Toner Conveying Roller
PC Drum
Developing Bias Terminal
4021M018AB
ON OFF
L H
L H
PC Drum
Wiring Diagram
6-B