Ricoh SH-P1 Series Training page 71

Toner End Detection Mechanism – 1
The agitator gear [A] drives
the agitator [B] through the
shutter plate [C].
Toner present:
Toner resists the agitator,
preventing it from turning
until the tab [D] of the gear
contacts the shutter plate.
The gap [E] in the shutter
plate does not align with
the hole [F] in the gear; so,
light is reflected back to
the toner end sensor [G].
Toner near-end:
There is low resistance to
the rotation of the agitator.
The torsion spring [H]
causes the gap of the
shutter plate to align with
the hole in the agitator
gear. Light is not reflected
back to the sensor.
Slide 71
Toner near-end + about 1,250 prints = Toner end
[G]
[A]
[D]
[F]
[E]
Toner present
See next slide.
71
[B]
Toner end
detected
SH-P1 Training
[C]
[H]