Locking The Developing Rotary; Detecting The Absence Of The Toner Cartridges - Canon CP660 Service Manual

CHAPTER 4 IMAGE FORMATION SYSTEM
C.

Locking the Developing Rotary

When the cartridge moves to its point of removal, the stopper lever is pushed to the
developing rotary assembly to lock the developing rotary assembly in position.
When the turret button (Figure 1-402) is pushed when replacing a color toner car-
tridge, the developing rotary assembly rotates; then, as soon as the color toner cartridge
stops at its position of removal, the DC controller PCB causes the developing rotary stop-
per signal (STPROT) to go '1' and the developing rotary stopper release signal (RLSROT)
to go '0' so that the developing rotary stopper solenoid (SL5) pushes against the stopper
lever to lock the developing rotary in place.
When the cartridge has been replaced and the toner cartridge cover has been closed,
the DC controller PCB causes the developing rotary stopper signal (STPROT) to go '0'
and the developing rotary stopper release signal (RLSROT) to go '1' so that the stopper
lever is pulled back to release the developing rotary.
D.

Detecting the Absence of the Toner Cartridges

To prevent the absence of a color toner cartridge, the machine is equipped with a car-
tridge releasing lever sensor.
This sensor is a reflection type sensor consisting of a light-emitting section and a
light-receiving section. If the cartridge releasing lever is not set correctly, the light from
the light-emitting section will be reflected by the cartridge releasing lever and detected by
the light-receiving assembly.
The DC controller PCB monitors the cartridge releasing lever sensor with reference
to the timing at which the cartridge cover is closed; when the cartridge releasing lever
detection signal (RLOCKS) goes '0', it communicates the fact to the printer board*
the absence of a color cartridge, thereby stopping the machine and indicating a message
to this effect.
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* Reader controller PCB (when making prints with the reader unit installed).
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COPYRIGHT © 1999 CANON INC.
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CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
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