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3: Operation
3-30
Colorwriter LSR 2000 Printer
Service Guide
Figure 3-18
Toner stirring plate
Toner-low detection/toner cartridge installation
detection
The toner cartridge has toner cartridge installation and toner-low
detecting functions. Light emitted from the LED of the toner
sensor (PS11) on one side of the printer is projected through the
toner cartridge sensor window via the optical guide within the
developing rotary. The stirring plate inside the toner container
scrapes the toner near the window so as to let the light pass through
the cartridge. The light then passes through the toner container and
is detected by photodiode of PS11 on the developing rotary. The
time required for the toner to build up enough to cover the window,
so light cannot pass through the window, is measured.
If the amount of time for light to pass through exceeds a fixed
period, the mechanical controller determines that the toner is low
and notifies the DC controller of it. The DC controller notifies the
video controller that toner is low.
Toner
container
Stirring
plate
Toner