Epson Stylus Color 640 Service Manual page 78

EPSON Stylus Color 440/640/740
2.2.4.8 CR Motor Drive Circuit
IC14(LB1845) on C206 Main-B, C255 Main board, IC14(UDN2917) on
C256 Main board, and IC11(LB1847) on C257 Main board are used for
driving CR motor. In the IC, Bi-pola drive PWM current control type is
performed, making it possible to provide stable current to each phase of
motor. The figures below show carriage motor drive circuit.
E05B44
(IC2)
PFAPH
CRA1
CRA0
CRBPH
CRB1
CRB0
CRV0
CRV1
CRV2
CRV3
Chapter 2 Operating Principles
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)
A
7
25
PH1
Out1A
6
23
I11
Out1B
/A
22 9
I01 Out2A
8
18
PH2 Out2B
20
I12
B
21
I02
/B
26
Vref1
17
Vref2
1
3
Rotor
2
4
Revision A
78