11.1 Operation; Pc Drum Charge Corona On/Off Control; Cleaning/Main Erase Mechanism - Konica Minolta bizhub C250 Service Manual

Theory of operation ver. 3.0 Aug. 2006

11.1 Operation

11.1.1

PC drum charge corona ON/OFF control

• The grid voltage (Vg) applied to the grid mesh is controlled through the image stabiliza-
tion control.
Main motor (M1) ON
Color PC drum motor (M2) ON
Drum charge corona bias Y, M, C
Drum charge corona bias K
Developing clutch/K (CL4)
Color developing motor (M3)
11.1.2

Cleaning/main erase mechanism

A. Cleaning/main erase operation
1. The cleaning blade is pressed up against the surface of the PC drum, scraping
residual toner off the surface (forward blade system).
2. Toner, which has been scraped off the surface of the PC drum, is fed by the toner
collecting screw back toward to the conveying screw in the rear of the machine. It is
then collected in the waste toner collecting box.
3. The surface of the PC drum after the image transfer process is irradiated with light
from the main erase lamp. This neutralizes any potential left on the surface of the
PC drum.
Toner collecting screw
Cleaning blade
11. Charge corona section
4038T2C024AA
4038T2C030AA
Cleaning blade
39