Lift Motor Control And Paper End Detection; Lift Motor Control - Ricoh FT5540 Service Manual

7. LIFT MOTOR CONTROL AND PAPER END DETECTION

7.1 LIFT MOTOR CONTROL

The paper size sensor is also used as a cassette set sensor. When the paper size actuator
plate is inserted into the paper size sensor, certain photointerruptors turn off (0 volts to 5
volts). After receiving a 5-volt signal through the paper size data bus, the CPU turns on the lift
motor.
The CPU energizes the lift motor until the lift sensor is de-actuated. When the lift sensor is
de-actuated, the photointerruptor is ON and its output drops from 5 volts to ground. After
receiving the 0 volt signal, the CPU turns off the lift motor.
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31 August 1989