Feed-Motor Drive Circuit - Star Micronics TSP200 Series Technical Manual

STB1
STB2
STB3
HD ON
(B)
BEO
(Q)

2-3. Feed-Motor Drive Circuit

The printer uses a 4-phase step motor (phase 1-2 excitation) to implement paper feed. The motor rotates through a certain
angle each time it receives a pulse from the drive circuit. The following diagram illustrates the excitation method. Figure
2-11 shows the feed-motor drive circuit.
1
2
3
4
Step
1
Trigger
Fig. 2-9 Timing Chart
ON
ON
2 3 4
Reverse Feed
Fig. 2-10 Motor Control by Phase 1-2 Excitation
IC1
CPU
PB4
TP8
TP9
TP10
TP11
Fig. 2-11 Feed-Motor Drive Circuit
Retrigger Retrigger
ON
5 6 7
Forward Feed
+24V
DT9
TR5
TA1
M-GND
– 19 –
PRINCIPLES OF OPERATION
tw
ON
ON
8
CN7
1
2
6 1
3 2
5 3
4 4