Ricoh J012 Service Manual page 361

Sensors
1st Registration
SN
Sensor
2nd Registration
SN
Sensor
SN Air Sensors
Carriage Position
SN
Sensor
SM
CÓPIA NÃO CONTROLADA
Attached to the left side of the carriage. As the carriage
moves from side to side during printing.
The registration sensor performs two important
functions for print control: 1) It detects the leading edge
of every sheet, and 2) it detects the width of the 1st
sheet of every print job when the carriage and sensor
pass horizontally over the vertical edge of the 1st sheet
as it feeds.
Located in the center of the printer above the transport
belt and behind the horizontal motor timing belt. This
photosensor detects the leading and trailing edge of
each sheet when the printer is printing at high speed.
These readings are used to control job timing and to
detect paper jams.
A pair of vertical pins at the top of each ink tank. This
pair of pins detects changes in the voltage differential
on the surface of the ink inside the print head tank.
When these terminals detect air in the tank, this
actuates the air release solenoid and vents air from the
tank through the air release valve. This allows more ink
to enter the tank.
Mounted under the right, front corner of the top cover.
Detects the position of the carriage and print heads
above the paper. When the envelope selector is pulled
forward, the feeler leaves the gap and switches the
sensor off. This mechanism is used to detect the up
and down position of the carriage and print heads.
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CÓPIA NÃO CONTROLADA
Electrical Components
J012/J013/J014