Ricoh D131 Service Manual page 1339

Component Layout
No. Component
Upper Tray Paper
S8 Height Sensor (Staple
Mode)
Upper Tray Paper
S9 Height Sensor
(Non-Staple Mode)
S10 Proof Tray Exit Sensor
S11 Proof Tray Full Sensor
Upper Tray Limit
S12
Sensor
Stacking Roller HP
S13
Sensor
SM
Function
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.
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.
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.
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.
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).
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
33 B804/B805/D373/D374/D612