Feed-Out Motor Circuit - Ricoh A318 Service Manual

1 May 1993

7.8 FEED-OUT MOTOR CIRCUIT

DF Main Board (PCB 1)
CPU
High/Low
ON/OFF
The DF CPU sends the speed data (high or low) to the driver IC and the
motor drive circuit. The motor drive circuit creates the PWM signal and sends
the motor drive pulses to the feed-out motor.
The frequency generator of the feed-out motor makes a very low voltage ac
signal which is fed back to the driver IC. The driver IC monitors the
frequency of this ac signal and based on the frequency it regulates the
motor speed.
AC Feedback
Voltage
Regulation
Motor
Driver
Drive
IC
Circuit
19
ORIGINAL FEED
CN104-A2
FG
CN104-A15
CN104-B8
Feed-out
CN104-A12
Motor