Paper Feed Motor Driver Circuit - Epson Stylus 1500 Service Manual

Operating Principles

Paper Feed Motor Driver Circuit

The paper feed motor for this printer drives the following mechanisms:
Paper feed
Paper pickup
Pump
The UDN2917EB paper feed motor driver IC (IC15) outputs a constant current to drive the paper
feed motor. The E05B12 gate array (IC2) determines the motor phase (PFAPH and PFBPH), phase
current (PFA0/1 and PFB0/1), and current setting signals (PFV), and then sends the signals to the
paper feed motor driver IC.
E05B12
(IC2)
83
P FA 0
84
P F A 1
88
P F B 0
87
P F B 1
85
P FA P H
86
P FB P H
92
P F V 3
91
P F V 2
90
P F V 1
89
P F V 0
Figure 2-25. Paper Feed Motor Driver Circuit Block Diagram
2-22
UDN2917EB
(IC15)
2
I10
1
I11
23
I20
24
I21
43
PH1
26
PH2
+5 V
44
P F V
VBB
V R E F 1
25
V R E F 2
PF Mo to r
6
P F A
A
3
P F _ A
A
18
P F B
B
21
P F _ B
B
22
+42 V
Rev. A