● Primary charging roller ● Memory tag Figure 1-21 Toner cartridge components DC controller High-voltage power supply Drum motor Cartridge Memory Tag Developing roller Primary charging roller The cartridge serves a role in the following functions: Photosensitive drum ● Memory tag The memory tag is a non-volatile memory in the cartridge and the DC controller controls it. The memory tag stores information about usage for the cartridge and the DC controller reads and writes the data in the memory tag. The DC controller determines an memory tag error and notifies the formatter when it fails to either read from or write to the memory tag.
● Cartridge-presence detection The DC controller detects whether the cartridge is installed in the product by monitoring the cartridge presence sensor. The DC controller notifies the formatter when it determines a cartridge absence. ● Toner-level detection 28 Chapter 1 Theory of operation ENWW