Canon GP200 Service Manual page 126

3. OPERATIONS AND TIMING
3. Detecting Waste Toner
The waste toner that has been scraped by the cleaning blade is forwarded to the rear of the cleaner
housing by the waste toner feeding blade inside the drum cleaner.
The coupling shown in Figure 3-511 is pushed against the blade under the pressure of a spring to trans-
mit the drive of the main motor to rotate the blade.
When the cleaner housing becomes full of toner, the rotation of the waste toner feeding blade drags
and the coupling moves back and forth in the axial direction to press the waste toner sensor lever, there-
by causing the waste toner sensor (PS10) to turn ON and OFF alternately.
The DC controller PCB monitors the output of the waste toner sensor for about 8 sec after the main
motor turns ON. The waste toner case is assumed to be full of waste toner when the output of the waste
toner sensor is detected ten times or more during the period.
Upon detection, the Waste Toner Case Full message will be indicated during standby.
Waste toner feeding blade
Cleaner housing
Photo sensitive drum
3–72
COPYRIGHT © 1996 CANON INC.
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Coupling
Figure 3-511 (conceptual diagram)
CANON GP215/200 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
Waste toner sensor
PS10
Main motor
M1