Epson Stylus Color 740 Service Manual

EPSON Stylus COLOR 440, 640, and 740 Chapter 2 Operating Principles
63
Paper Feed (PF) Motor Driver
The paper feed motor is a bipolar stepper motor controlled b
y
a pulse-
width modulation
(
PWM
)
circuit. The drive circuit provides contant
current output for maximum motor stabilit
y
and control. See the
followin
g
fi
g
ures for circuit details.
Figure 2-35. PF Motor Driver for Stylus COLOR 740
Figure 2-36. PF Motor Driver for Stylus COLOR 440
Figure 2-37. PF Motor Driver for Stylus COLOR 640
+5
M 6252(IC 16)
-
+
7
6
5
C 90A 05
(IC 1 )
112
DA1
D0
D1
D2
PHASE
REF
PFD
A3956(IC 13)
OUTA
OUTB
VBB
VCC
Current
Detection
D0
D1
D2
PHASE
REF
PFD
A3956(IC 12)
OUTA
OUTB
VBB
VCC
4
5
6
7
E05B588(IC 2)
PFIB0
PFIB1
PFIB2
PFPHAB
PFIA0
PFIA1
PFIA2
PFPHAA
8
9
10
11
14
9
8
7
2
1
14
9
8
7
2
1
10
15
Rotor
A
/A
B
/B
1
3
2
4
CN8
10
15
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

Epson Stylus Color 740 Specifications

General

Brand	Epson
Model	Stylus Color 740
Category	Printer
Language	English