The DC controller determines a cartridge absence by monitoring the cartridge sensor (PS115) when
any of the following occurs:
●
The product is turned on.
●
The door is closed.
The DC controller notifies the formatter when it detects a cartridge absence.
Toner detection
The DC controller detects the remaining toner level in the cartridge according to the TONER LEVEL
signal.
The DC controller determines a cartridge low or cartridge out status when the toner level drops below a
specified level and notifies the formatter.
Electrophotographic process
The electrophotographic process (image formation) is divided into stages.
Figure 1-10 Stages of image-formation
1. Primary charge (conditioning)
The primary-charging roller in the print cartridge applies a uniform negative charge to the surface of the
drum. The primary-charging roller is made of conductive rubber. An AC bias is applied to the roller to
22 Chapter 1 Theory of operation ENWW
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