6.9 FEED-OUT MOTOR CIRCUIT
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 mo-
tor drive pulses to the feed-out motor.
The frequency generator of the feed-out motor makes a very low voltage ac cur-
rent which is fed back to the driver IC. The driver IC monitors the frequency of
this ac current and based on the frequency it regulates the motor speed.
DF Main Board
CPU
CN104-A2
High/Low
Regulation
Feed-out
Motor
FG
Driver
Drive
Circuit
IC
ON/OFF
AC Feedback
CN104-A15
Voltage
CN104-B8
CN104-A12
Motor
30 November 1990
7-19
