Toner Density Control (Pcdc) - Epson ColorPage EPL-C8000 Service Manual

EPSON EPL-C8000

2.7.5.2 Toner Density Control (PCDC)

The toner density in the developer becomes degraded as more
printings are done. To obtain a stable printed image, stable toner
density in the developer must be maintained. The PCDC (Pixel Count
Dispense Control) counts the number of video signals that are input to
the ROS Assembly and computes the consumed toner amount in the
development process. Based on data from the PCDC, the system
provides toner to the Developer Assembly. The toner is supplied to the
Developer Assembly from the Toner Cartridge when the system rotates
the Dispense Motor (Dispense Motor Assembly) (driving the Auger in
the Developer Assembly) for the calculated duration (dispense time).
The PCDC counts the capacitor charges/discharges for the video
signals in the CR circuit that has been implemented parallel to the video
signal cable.
Chapter 2 OPERATING PRINCIPLES
Figure 2-43. Toner Density Control (PCDC)
Rev. B
Controller PWB
Toner Consumption
Calculation
2-50