Canon 1000 Service Manual page 155

c. Supplying Color Toner
If the results of measuring the toner density indicate that the density of toner inside the developing
assembly is below a specific level, the DC controller sends the toner supply signal to turn on the toner supply
clutch. As a result, the drive of the Pick-up motor moves through the toner supply screw to supply toner to the
developing assembly. This operation is executed while the developing cylinder is rotating after measuring
the density of toner.
The duration of toner supply, i.e., during which the toner supply clutch remains on, varies depending on
the toner density signal.
Toner level signal
(TS4,TS5,TS6)
Toner supply clutch
(CL1,2,3)
M10
Pick-up motor
COPYRIGHT © 2001 CANON INC.
Toner level detection signal (YTEP*,MTEP*,CTEP*)
Error detection sensor (TS1,TS2,TS3)
Error detection signal (YTEP*,MTEP*,CTEP*)
Toner supply signal (CL1D*,CL2D*,CL3D*)
Pick-up motor drive signal (M10MD)
Figure 3-539
CANON CLC1000/1000S/3100 REV.2 MAY 2001 PRINTED IN JAPAN (IMPRIME AU JAPON)
3. OPERATION AND TIMING
DC
controller
PCB
3-111