Paper Feed (Pf) Motor Driver - Epson Stylus COLOR 440 Service Manual

EPSON Stylus COLOR 440, 640, and 740

Paper Feed (PF) Motor Driver

The paper feed motor is a bipolar stepper motor controlled by a pulse-
width modulation (PWM) circuit. The drive circuit provides contant
current output for maximum motor stability and control. See the
following figures for circuit details.
Figure 2-35. PF Motor Driver for Stylus COLOR 740
E05B44
(IC2)
59
PFAPH
58
PFA1
57
PFA0
50
PFBPH
56
PFB2
55
PFB0
46
PFV0
47
PFV1
48
PFV2
49
PFV3
+5
Figure 2-36. PF Motor Driver for Stylus COLOR 440
E05B43
(IC2)
57
PFA0
58
PFA1
55
PFA0
56
PFB1
56
PFB2
59
PFAPH
46
PFV0
47
PFV1
48
PFV2
49
PFV3
+5
Figure 2-37. PF Motor Driver for Stylus COLOR 640
Chapter 2 Operating Principles
LB1B45 CN7
(IC15)
A
25 7
PH1
Out1A 1
6
23
I11
Out1B
/A
9
22
I01 Out2A
3
8
18
PH2 Out2B
20
I12
B
21
2
I02
/B
4
26
Vref1
17
Vref2
UDN2917
CN7
(IC15)
A
2 6
I10
Out1A 1
3
1
I11
Out1B
/A
18
23
I20 Out2A 3
24 21
I21
Out2B
43
PH1
B
26
2
PH2
/B
4
44
Vref1
25
Vref2
Rotor
Rotor
63