MX-C250 OPERATIONAL DESCRIPTIONS 11 – 19
B. Developing operations
Electrostatic latent images formed on the OPC drum surface by the
laser (writing) unit (laser image beams) are converted into visible
images by toner.
By stirring, toner and carrier are negatively charged by mechanical
friction and chemical reaction.
The developing bias voltage (AC component and negative DC
component) is applied to the developing roller.
Negatively charged toner is attracted to the exposed section on the
OPC drum where the negative potential falls due to a higher devel-
oping bias. If the OPC drum is not exposed, the negative potential
is higher than the developing bias voltage, and toner is not
attracted. The toner sensor detects the toner supply state from the
toner cartridge. In this machine, the toner density is detected by the
toner sensor, but the toner supply operation is not controlled only
by the toner density detection result. The toner density control is
performed according to the process control data.
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