Canon NP6317 Specifications Page 72

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CHAPTER 4 IMAGE FORMATION SYSTEM
COPYRIGHT
©
1999 CANON INC. CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
4-14
VI. DEVELOPING ASSEMBLY/DRUM CLAENER
A. Outlines
The paddle inside the drum cleaning unit and also the developing cylinder are rotated by the
main motor.
The amount of toner in the developing assembly is sensed by the black toner level sensor
(TS1).
When the amount of toner falls below the required quantity, the ADD TONER indicator on the
control panel will flash.
The toner collected by the cleaning blade is stored in the drum cleaning unit.
The developing assembly is pressed against the drum by a cam that presses against the devel-
oping assembly rail. (The cam is operated by the developing assembly release lever.)
B. Remaining Toner Sensor
The black developing assembly has a piezoelectric type sensor (TS1) which senses if the toner
remaining in the hopper of the developing assembly is above or below the required level.
When the amount of toner in the developimg assembly is sufficient, the sensor output is '1'.
When it is below the specified level, the output is '0'.
The DC controller PCB checks for 40 sec during copying if the TONER EMPTY signal (TEP)
is being outputted. If the signal is outputted continuously for 40 sec, it is regarded as "TONER
OUT" and the DC controller PCB makes the ADD TONER indicator flash.
Figure 4-601
Main motor
Paddle
Developing cylinder
TONER EMPTY signal
(TEP)
Drum cleaning unit
Torque
limiter
Black developing
assembly
Black toner level
sensor(TS1)
Developing assembly
positioning cam
Developing assembly
rail unit
Stirrer
Photosensitive
drum
ReleasedPressed
Cleaning blade
M1
DC controller
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