Canon iR C2880 Series Service Manual page 265

Message type
Waste toner full
[2]
[3]
[1] Waste toner count
[2] Waste toner case full alert detection signal
[3] Waste toner case
[4] Waste toner
[5] Waste toner screw
UN6: waste toner sensor (optical sensor)
The following is a brief description of the foregoing types of detection:
1. detection by an optical sensor
The machine uses an optical sensor (UN8) mounted behind the waste toner case to check the amount of waste toner. The detection takes place when the level of
waste toner is between 0% and 95%, and the result is sent to the DC controller, which will issue a waste toner case full alert to the main controller when the result
indicates the level to be 95%.
MEMO:
The sensor consists of a light-emitting segment (LED) and a light-receiving segment (PD).
When the level of waste toner is low, the light from the LED is received by the photodiode. When the level increases, on the other hand, the presence of waste toner
blocks the light from the LED, thus preventing reception of light by the photodiode, thus causing the output of the sensor to change from High to Low. The change
in the sensor output causes the DC controller to assume that the waste toner case is 95% full with waste toner.
Message contents
"Replace waste toner bottle."
[5]
M-CON
[1]
D-CON
PS11
[4]
F-7-51
Chapter 7
Waste toner
Detected by
quantity
100 % Video count
[4]
[3]
7-41