HP 2700n Service Manual - Page 107
Print-cartridge activation,
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Figure 4-17 Print cartridge The cartridges in this printer include the photosensitive drum, the primary charging roller, and the developing roller. Each cartridge performs these functions: ● Memory tag control ● Cartridge presence detection ● Developing roller engagement and disengagement control Print-cartridge activation A memory tag is a nonvolatile memory that is built into the print cartridge. The DC controller reads and writes data that is stored in the memory tag. The DC controller reads data at the following times: ● When the power is turned on ● When someone closes the front cover ● When it receives a command from the formatter The DC controller writes information at the following times: ● At a specified interval during printing ● When it receives a command from the formatter When the read/write operation fails or the wrong data is read or written, the DC controller determines that an error has occurred and notifies the formatter of a cartridge-memory abnormality. Printing then stops. ENWW Image-formation system 89