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

10.9 LIFT MOTOR CONTROL AND PAPER END DETECTION

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, one or more photointerrupters 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 deactuated. When the lift sensor is
deactuated, the photointerrupter is ON and its output drops from 5 volts to 0 volts. After
receiving the 0 volt signal, the CPU turns off the lift motor.
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31 August 1989