HP CP4525DN Laser CC494A#ABA manual Developing-roller engagement and disengagement

The DC controller determines a 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 the presence of the cartridges by monitoring the memory tag. The DC controller notifies the formatter when a cartridge is missing or installed in the incorrect slot.

●Toner level detection: The DC controller detects the remaining toner in a cartridge by the optical detection method and then notifies the formatter of the remaining toner level.

●Cartridge life detection: The DC controller detects the cartridge life by monitoring the total operating time or remaining toner level of the print cartridge. The DC controller determines a cartridge end of life and notifies the formatter when total operating time of the cartridge reaches a specified time or the cartridge runs out of toner.

Developing-roller engagement and disengagement

The product can print in full-color mode or in black-only mode. To print in black-only mode, the product disengages the developing rollers in the cyan, magenta, and yellow print cartridges which maximizes the life of the cartridges.

Figure 1-24Developing-roller engagement and disengagement control

DC controller

Developing

M10 disengagement motor

Developing unit

SR11

Developing disengagement sensor

Photosensitive drum

Developing disengagement cam

Developing unit is disengaged Developing unit is engaged

30 Chapter 1 Theory of operation ENWW