Paper Feed Sequence - Brother DX-2000 Service Manual

3.

PAPER FEED SEQUENCE

(1) As soon as the printer requests for Duplex drive,
the solenoid is turned on, the flapper is switched,
and the motor runs forward.
(2) The reverse sensor is monitored to measure the
time from when the solenoid is turned on to when
the sensor is turned on.
If the sensor has not turned on after a specified
time passed, it is deemed that paper jam has
occurred.
(3) The solenoid is turned off in response to
instructions from the printer, and the flapper is
returned as it was before.
After the reverse sensor is turned on, the time up
to when the paper has passed through the reverse
sensor is monitored.
If the sensor has not turned off within a specified
time, it is deemed that paper jam has occurred.
(4) Immediately after the reverse sensor is turned off,
the motor begins through-down, stops for a
specified time, and runs backward.
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