Muratec MFX-2500 Field Engineering Manual page 48

2.4.9.2 Developing Bias
The amount of toner attracted onto the surface of the PC Drum is controlled by varying the developing
bias voltage.
As the PC Drum deteriorates and its photoconductive layer begins to wear, it becomes more sensitive to
the increase in the amount of toner. As a countermeasure against this problem, the developing bias
voltage is automatically switched according to the PC Drum temperature, thereby stabilizing the image
quality level.
PC Drum
Sleeve/Magnet Roller
Developing Bias Contact Terminal
Electrical Component Control Signal ON OFF
PJ14A-1A
Vb L H
See block diagram of the printer.
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