Memory chip
The memory chip is non-volatile memory that stores information about the usage of the toner cartridge and
helps protect the customer from counterfeit cartridges. This chip is also used to detect the presence of a
cartridge within the printer or when a cartridge is installed in the wrong slot. The printer reads and writes the
data in the memory chip.
Toner seal
The toner cartridge seal is opened automatically when the toner cartridge is installed into the printer.
Toner level and cartridge life detection
Toner level detection: The DC controller detects the remaining toner in the cartridge by the optical detection
method and then noties the formatter of the remaining toner level.
Cartridge life detection: Cartridge life detection is measured in two ways.
1. Toner level:
●
For the rst 75% of cartridge life, toner level is measure through pixel counting by the DC
controller. Once the level reaches 25%, the toner level sensor utilizes electrical properties to
determine the amount of toner remaining.
2. Rotations of internal components (OPC and developer roller):
●
The DC controller monitors these two life parameters and reports them to the formatter as percent
life remaining. End of cartridge life is determined by the lower value of the two.
Developing unit engagement and disengagement control
The printer can print in full-color mode or in black-only mode. To print in black-only mode, the printer
disengages the developing rollers in the cyan, magenta, and yellow toner cartridges, which maximizes the life
of the cartridges.
42 Chapter 1 Theory of operation ENWW
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