Ricoh FT6645 Manual page 53

DRUM UNIT 23 April 1993
2.5.4 Toner Collection Mechanism
[B]
[E]
[D]
[G]
[F]
[C]
[A]
Toner collected by the cleaning unit is transported to the toner collection
bottle [A] through the toner collection tubes. Three helical coils are used for
toner transport.
One coil [B] is driven by the main motor via drive belts and the other coil [C]
is driven by an independent toner collection drive motor [D].
The actuator disk [E] on the toner collection drive motor monitors the proper
rotation of the toner collection coil [C] to prevent the coil from being damaged
by toner clogged in the collection tube. The main PCB monitors the sensor
output and increases the motor speed if the sensor monitors that the toner
collection motor rotates at a speed lower than normal. Also, the CPU will
display an SC 342 if no signal changes (ON → OFF) are detected for more
than 2.55 seconds while the toner collection motor is turning.
When the toner collection bottle [A] become full, the toner pressure in the
bottle increases and presses the gear [F] against the toner overflow switch
[G]. After the toner overflow switch is activated, the finishing of the copy job,
or up to 100 continuous copies, is allowed, then copying is prohibited and the
service call "full toner collection bottle" indication is displayed on the LCD.
This condition can be cleared by de-actuating the toner overflow switch while
de-actuating then actuating the toner collection bottle switch ([C] in next
page).
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