Motor Drive Circuit - Toshiba 4560 Service Manual

8.3 Motor Drive Circuit

8.3.1 Brush motor drive circuit
Tray-up motor (T-UP-MOT)
The block diagram of TA8428 is shown below.
Protection for
overheating and
over current
Control logic
1
IN1
IN1 and IN2 are input terminals for the signals from the microcomputer. In the control section, the motor
is controlled ON and OFF based on the signals from the microcomputer. For the control, refer to the table
below.
Nov. 1997 © TOSHIBA
: Driven by IC9 (upper cassette)/IC3 (lower cassette) (PWA-LGC:
TA8428)
2 3
IN2 M(+)
Input
IN1 IN2
H H
L H
H L
L L
4 5
GND M(–)
Output
M (+) M (–)
L L BRAKE
L H CCW (upward)
H L CW (downward)
OFF (high impedance) STOP
8 - 7
6 7
N.C. V
CC
Description
4560/4570 FEEDER