Canon 1000 Service Manual page 165

If the waste toner pipe becomes clogged for some reason and the waste toner feeding screw will not
rotate, leakage of waste toner can occur.
To prevent such a problem, a feeding screw detection mechanism is provided. The gear A (Figure 3-
553) used to drive the waste toner feeding screw shifts over the shaft because of the axial force that occurs
when the feeding screw locks.
The shift of the gear A is checked by the lock detection switch (SW4). When the gear A pushes the
switch, the waste toner feeding motor (M20) stops and 'E013' will be indicated on the control panel.
COPYRIGHT © 2001 CANON INC.
(front of copier)
Figure 3-553
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
Lock detection switch
(MS4)
Gear
M20 Waste toner
feeding motor
DC controller PCB
A
3-121