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Power Supply System 5-5
Toner Cartridge Detection
The Toner Cartridge has a Toner sensor. The circuit compares the
output value of the developing AC bias and the output value from the
antenna inside the Cartridge, and outputs the Toner detection signal.
The CPU detects the remaining Toner level and the presence of the
Cartridge when the developing bias is applied to the Developing
Cylinder. The remaining Toner level is always detected when the
developing bias is applied. The presence of the Cartridge is detected
only when the developing bias is applied during the initial rotation.