Davin J012, Service Manual

Page: 296 / 365

No. Component Function
alert if the sensor does not turn on after two rotations of the paper
feed roller.
SN
Vertical Encoder
Sensor
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.
SN
Horizontal Encoder
Sensor
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.
Solenoids
SOL
Air Release Solenoid
– SOL 1
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.
Switches
SW Top Cover Switch
Mounted under the front edge of the top cover of the printer. Detects
when the top cover of the printer is open or closed. The printer will
not operate if the top cover is open.
SW
Duplexer Cover
Switch
Mounted on the DIB inside the duplexer. Detects when the duplexer
cover is open or closed. The printer will not operate if the duplexer
cover is open.
Thermistor
TH Thermistor
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.
Electrical Components
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