Epson 440 - Manual (Page 76)

EPSON Stylus Color 440/640/740 Revision A
Chapter 2 Operating Principles 76
2.2.4.7 PF (Pump) Motor Drive Circuit
IC15(LB1845) on C206 Main-B, C255 Main board, IC15(UDN2917) on
C256 Main board, and IC12/13(A3956) on C257 Main board are used
for driving PF (Pump) 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. Also, it makes possible to change over the
reference voltage as drive current settings by making few combinations
using current setting ports(input). However, firmware does not support
Micro-step in the Stylus Color 440/640/740. The figures below show
connection diagram of PF (Pump) motor drive circuit.
Figure 2-35. PF (Pump) Motor Drive Circuit for Stylus Color 440
Figure 2-36. PF (Pump) Motor Drive Circuit for Stylus Color 640
E05B44
(IC2)
PFAPH
PFA1
PFA0
PFBPH
PFB2
PFB0
PFV0
PFV1
PFV2
PFV3
59
58
57
46
47
48
49
LB1B45
(IC15)
PH1
I11
25
23
I01
22
50
PH2 18
56
I12
20
55
I02
21
Vref1
Vref2
26
17
+5
Out1A
Out1B
Out2A
Out2B
7
6
9
8 Rotor
A
/A
B
/B
1
3
2
4
CN7
E05B43
(IC2)
PFA0
PFA1
PFA0
PFB1
PFB2
PFAPH
PFV0
PFV1
PFV2
PFV3
57
58
55
46
47
48
49
56
56
59
+5
Rotor
A
/A
B
/B
1
3
2
4
CN7 UDN2917
(IC15)
I10
I11
2
1
I20
23
I21
24
PH1
43
PH2
26
Vref1
Vref2
44
25
Out1A
Out1B
Out2A
Out2B
6
3
18
21