Component Layout
SM 33 D373/D374
Finisher
D373/D374
No. Component Function
S8
Upper Tray Paper
Height Sensor (Staple
Mode)
This is the upper sensor of the upper/lower paper height
sensor pair that controls the lift of the upper tray. This
sensor detects the paper height of the stack in the upper
tray when the copier is operating in the staple mode.
S9
Upper Tray Paper
Height Sensor
(Non-Staple Mode)
This is the lower sensor of the upper/lower paper height
sensor pair that controls the lift of the upper tray. When
the machine is switched on, the upper tray rises until the
actuator on the tray triggers this sensor to switch off the
upper tray lift motor.
S10 Proof Tray Exit Sensor
This sensor detects and times the feeding of paper to
the proof tray. It also detects whether paper is present at
the proof tray exit when the copier is switched on.
S11 Proof Tray Full Sensor
The top of the stack in the proof tray increases until it
nudges the feeler of this sensor. The sensor then
signals that the proof tray is full and the job halts until
some paper is removed from the proof tray.
S12
Upper Tray Limit
Sensor
This sensor controls the position of the upper tray 1)
during straight-through feed out, 2) during shift feed out,
3) when the machine is turned on. The machine obeys
the signal of whichever sensor is actuated first.
An actuator attached to an arm triggers this sensor. The
tip of the same arm depresses the upper tray limit
switch. If the sensor fails, the tip of the arm will activate
the upper tray limit microswitch (SW2) and stop the lift
of the upper tray.
Note: When the machine is turned on, the upper tray
position is controlled by either this sensor or the upper
tray paper height sensor (S9).
S13
Stacking Roller HP
Sensor
Controls the forward and back motion of the stacking
roller (a sponge roller) located at the output slot of the
upper tray. The sponge roller drags each ejected sheet
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