Developing/Cleaning Assembly - Canon NP6621 Service Manual

OPERATIONS AND TIMING
I. Developing/Cleaning As-
sembly
1. Outline
The machine's photosensitive drum, developing
cylinder, No. 1 stirring rod, and No. 2 stirring blade
are rotated by the drive of the main motor (M1).
The level of toner inside the developing assembly
is checked by the toner sensor; if the toner level
drops below a specific level, the ADD TONER
message is indicated on the control panel.
Cleaning blade
Waste toner
feeding blade
Waste toner
assembly
3–50
Drum cartridge
Primary charging
roller
Photosensitive
drum
M1
Motor drive signal
Figure 3-312
COPYRIGHT © 1998 CANON INC.
The No. 1 stirring rod is used to supply toner to
the developing cylinder and stir the layer of toner
inside the developing chamber.
The No. 2 stirring blade is used to stir the toner
inside the toner container and to supply toner to the
developing chamber.
The waste toner collected by the cleaning blade
is moved by the waste toner feeding blade for
collection in the waste toner container.
Toner sensor
Developing
cylinder
No. 1
stirring rod
Toner level
detection PCB
Torque limiter
Main motor/
Main motor
driver PCB
DC controller PCB
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Toner container
No. 2 stirring blade