Panasonic KX MC6020 - Color Laser - All-in-One - Toner Sensor

86
KX-MC6020HX
6.13.12. Toner Sensor
This sensor detects the toner cartridge and the toner level.
The toner cartridge is detected just after the power is turned ON or the covers are closed. (The same with each color)
The toner level is detected by LED light through the cartridge when the toner is decreased to a certain level.
The phototransistor detects the light, causing the input levels of IC702 (Yellow, Magenta) and IC703 (Cyan, Black) to start dropping.
After the number of input voltage signals below the threshold level goes over the specified number and the hardware detects the
toner is empty, the software starts to count the printing pixel number.
Alarm display appears when it reaches the setting value. (The same with each color)