EPSON Stylus COLOR 440, 640, and 740
Carriage (CR) Motor Drive Circuit
The carriage motor is a bipolar stepper motor controlled by a pulse-
width modulation (PWM) circuit. The drive circuit provides constant
current output for maximum motor stability and control. See the
following figures for circuit details.
E05B44
(IC2)
PFAPH
CRA1
CRA0
CRBPH
CRB1
CRB0
CRV0
CRV1
CRV2
CRV3
77
76
75
74
73
72
46
47
48
49
+5
Figure 2-38. Carriage Motor Drive Circuit for Stylus COLOR 440
LB1B45
CN6
(IC14)
7
25
PH1
Out1A
6
23
I11
Out1B
9
22
Out2A
I01
8
18
PH2
Out2B
20
I12
21
I02
26
Vref1
17
Vref2
Chapter 2
Operating Principles
A
1
/A
3
Rotor
B
2
/B
4
64