Ricoh J012 Service Manual page 364

Electrical Components
SN Trailing Edge Sensor
Vertical Encoder
SN
Sensor
Horizontal Encoder
SN
Sensor
J012/J013/J014
CÓPIA NÃO CONTROLADA
Mounted at the right, rear corner of the printer (viewed
from the back). The feeler of this interrupt sensor is
mounted in the center of the paper path and connected
to a long shaft. The end of the shaft has an actuator
that moves in and out of the sensor gap. The feeler is
pushed down by every sheet of paper and the actuator
leaves the gap, then the feeler pops up again after the
trailing edge passes and the actuator enters the gap
and switches the sensor off. The length of time the
sensor remains on is used to measure the length of the
paper for print timing control. The sensor issues a
paper end alert if the sensor does not turn on after two
rotations of the paper feed roller.
Mounted on the SENC PCB with the rim of the vertical
encoder wheel positioned in its gap. This sensor reads
the code on the rim of the vertical encoder wheel as it
rotates to control the operation of the vertical motor
during paper feed.
Mounted on the carriage with the horizontal encoder (a
film strip) positioned in its gap. This sensor reads the
code on the edge of the horizontal encoder as the
carriage and print heads move horizontally to control
the operation of the horizontal motor during printing as
the carriage moves left and right during printing.
6-26
CÓPIA NÃO CONTROLADA
SM