Canon CLBR 460ps Service Manual page 111

d. Toner cartridge position (contact/separation) detection function
This function detects the position (contact/separation) of the developing cylinder in the toner
cartridge which is brought closer to or further from the photosensitive drum by the toner car-
tridge contact/separation function (see page 2-52).
The toner cartridge position is detected by the toner cartridge contact sensor (PS11) in the
rotary drive unit.
When the toner cartridge is brought further from the drum, rotation of the developing rotary
shaft is transmitted to the toner cartridge contact gear, and the projection of the gear pushes up
the toner cartridge contact detection lever. As a result, the lever is removed from the PS11 and
the TONER CARTRIDGE CONTACT signal (/DEVCAM) goes "H." When the toner cartridge is
brought closer to the drum, the projection of the toner cartridge contact gear is detached from
the toner cartridge contact detection lever. As a result, the lever is lowered and blocks the light
from the PS11, and the /DEVCAM signal goes "L."
When the /DEVCAM signal does not switch from "H" to "L" or from "L" to "H" during the spec-
ified period of time in WAIT period, the DC controller stops the printer and notifies the video con-
troller of a toner cartridge contact/separation error.
Toner cartridge contact
sensor (PS11)
Toner cartridge
contact gear
Developing rotary shaft
< When the toner cartridge is
brought further from the drum >
Toner cartridge contact
detection lever
Toner cartridge
push cam
Slider
Figure 2-4-9
<When the toner cartridge is
brought closer to the drum>
CHAPTER 2
2 - 53