Print cartridge
The print cartridge contains the primary-charging roller, photosensitive drum, and developing
cylinder. The print cartridge has built-in memory that records the number of rotations and the toner
level. This information is passed to the DC controller, which sends an alert when the remaining print-
cartridge life reaches a low threshold.
Cartridge memory
The cartridge memory is EEPROM built into the cartridge, so that the MFP can detect the cartridge
conditions.
The cartridge memory read/write is performed by the memory controller board through the antenna
unit. The DC controller PCA reads the cartridge information and writes that information to the
memory. The memory read/write process is implemented when the memory controller board receives
a command from the DC controller PCA at the following timing.
Figure 4-11 Cartridge memory
Reading timing
● When the power is turned on
●
When the door is closed
●
When the DC controller PCA receives a command from the formatter
Writing timing
●
When printing is completed
●
When the DC controller PCA receives a command from the formatter
132 Chapter 4 Theory of operation ENWW
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