Ricoh Toscana-P1 J007 Service Manual page 245

6. Detailed Section Descriptions
No.
Sensors
1st Registration Sen-
SN
sor
2nd Registration Sen-
SN
sor
6
SN Air Sensors
Carriage Position
SN
Sensor
Ink Cartridge Set
SN
Switches
Ink Collection Tank
SN
Sensor
SN Ink Level Sensor
244
Component
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 car-
riage 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.
A microswitch for each ink cartridge connected in series and
mounted on the ink cartridge detection plate at the back of the
right front cover that holds the ink cartridges. A metal contact on
the back of the ink cartridge makes contact with the microswitch
when the ink cartridge is inserted. This tells the machine whether
the ink cartridge is inserted or inserted correctly.
A "smart" reflective sensor mounted at the back of the ink collection
tank. Detects when the ink collection tank is almost full and alerts
the operator that the ink collection tank needs to be replaced.
Mounted above the front guide rail. Monitors the positions of the
ink level lever of each ink tank. The vacuum created inside the ink
tanks as ink is consumed gradually draws the base of the spring-
Function