Ricoh Toscana-P1 J007 Service Manual page 247

6. Detailed Section Descriptions
No.
Vertical Encoder Sen-
SN
sor
Horizontal Encoder
SN
Sensor
Solenoids
6
Air Release Solenoid
SOL
– SOL 1
Switches
SW Top Cover Switch
Duplexer Cover
SW
Switch
Thermistor
TH Thermistor
246
Component
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 hor-
izontally to control the operation of the horizontal motor during
printing as the carriage moves left and right during printing.
Located under the right corner of the front cover, near the envelope
selector. When the air level sensors detect that there is air in a tank,
the system activates the air release solenoid to suck air from the
tank. The partial vacuum pulls in the sides of the tank. This changes
the position of the feeler on the side of the tank (used for ink level
detection) and pulls ink into the tank from the ink supply tube.
Mounted under the front edge of the top cover of the printer. De-
tects when the top cover of the printer is open or closed. The printer
will not operate if the top cover is open.
Mounted on the DIB inside the duplexer. Detects when the du-
plexer cover is open or closed. The printer will not operate if the
duplexer cover is open.
This is a small bulb thermistor on the end of a wire and attached
to the HRB. This thermistor measures the temperature around the
print heads.
Function