Drum Cleaning Assembly/Developing Assembly; Outline - Canon NP6251 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
II. DRUM CLEANING ASSEMBLY/DEVELOPING
ASSEMBLY
A. Outline
The developing assembly is operated by the drive of the main motor controlled by
the developing clutch (CL8).
The cleaning assembly is provided with the drive of the main motor through drum
gears.
The toner inside the developing assembly is monitored by the toner level detection
circuit, and toner is supplied by the hopper assembly when the level falls below a specific
value. The toner inside the hopper assembly is monitored by the toner sensor (TS1), and
the Add Toner message will be indicated when the level of toner falls below a specific
value. (Thereafter, copying will be forced off after making about 200 copies.)
The developing assembly is supplied with toner by the hopper assembly using the
drive of the hopper motor 1 (M11). The toner inside the hopper assembly is stirred by the
hopper motor 2 (M10).
The toner scraped off by the cleaning blade is moved to the rear of the copier by a
feeding screw inside the cleaner assembly; it is then forwarded through the waste toner
feeding pipe for collection in the waste toner case.
The waste toner feeding assembly is equipped with a torque limiter. If the screw
becomes clogged with waste toner, the waste toner feeding screw detection circuit turns
on to turn off the main motor (M1).
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COPYRIGHT © 1997 CANON INC.
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CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)