User manual

95.08.23.11.29
Color LaserWriter 12/600 PS Basics & Theory 1–45
Cartridge-
Presence
Detection
The printer has cartridge-presence and toner-level detecting functions.
Both these functions are served by toner sensor PS11. Cartridge pres-
ence is sensed when the cartridge is in the “stop” position.
When a toner cartridge is in the “stop” position, the LED of toner
sensor PS11 emits lights through a light pipe in the toner carousel.
Each cartridge bay has its own light pipe. The light emitted from the
light pipe is normally blocked by the cartridge and does not reach the
receiving diode of PS11 mounted above the toner carousel.
If the light does reach the receiving diode, the DC controller determines
that no cartridge is installed in that bay and notifies the I/O controller.
Sound: Cartridge-presence sensing occurs after printer startup or
following the actuation of the toner ejection sensor. The controller
rotates the carousel to each of the four stop positions, confirms that a
cartridge occupies each bay, then continues its startup sequences. Click
the icon to the left for a sound sampling of the carousel during
cartridge-presence sensing.
Toner Sensor PS11 (Receiver)
Toner Sensor PS11 (Emitter)
Toner Cartridge
Sound