Ricoh A151 Field Service Manual page 349

ORIGINAL FEED
7.5 DF MOTOR CIRCUIT
A662D507.wmf
The DF motor is a 24 volt dc motor. When the CPU receives the feed signal
from the copier, the CPU outputs the ON signal and the Forward signal to the
gate IC. On receipt of the forward signal from the gate IC, the driver IC
outputs 24 volts to CN117-1 and 0 volts to CN117-2. This causes the DF
motor to start turning in the forward direction.
Within 10 to 25 pulses after the original's trailing edge passes through the
registration sensor, the CPU stops sending the ON signal and the Forward
signal. The DF motor stops turning. Then the CPU outputs the ON signal and
the reverse signal for 15 pulses. Then the driver IC outputs 0 volts to
CN117-1 and +24 volts to CN117-2 to reverse the DF motor.
SM 9-11 A202/A203