Epson EPL-N1200, Service Manual

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2.1.1.9 Toner Empty Sensor
Toner empty is detected by the toner empty LED and the photo sensor on the toner empty
detection board.
When there is enough toner in the imaging cartridge, light is not reflected from the toner empty
sensor LED. When toner in the imaging cartridge is empty, light from the toner empty sensor LED is
reflected by the reflective mirror. Then, the photo sensor receives the light and the controller
recognizes a toner empty condition.
When you open and close the top cover after the printer has detected a toner empty signal, the
controller assumes that the imaging cartridge has been replaced and resets the toner empty status.
Toner is enough Toner is empty
Figure 2-10. Toner is Enough
Reflective Mirror
Photo Sensor
Toner Empty Sensor LED
LED Transparent Windowpane
Figure 2-11. Toner is Empty
EPL-N1200 Service Manual Operating Principles
Rev. A 2-7