Paper Feed Motor Driver Circuit; Figure 2-24. Paper Feed Motor Driver Circuit Block Diagram - Epson Stylus 1500 Service Manual

Operating Principles

2.3.2.4 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
for the printer mechanism. 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)
P FA 0
P F A 1
P F B 0
P F B 1
P FA P H
P FB P H
P F V 3
P F V 2
P F V 1
P F V 0

Figure 2-24. Paper Feed Motor Driver Circuit Block Diagram

2-20
83 2
1
84
88 23
24
87
85
43
PH1
26
86
PH2
+5 V
92
44
P F V
91
V R E F 1
90 25
89
Stylus 1500 Service Manual
UDN2917EB
(IC15)
I10
6
I11 A
I20
3
I21
A
18
B
21
B
22
VBB
V R E F 2
PF Mo to r
P F A
P F _ A
P F B
P F _ B
+42 V
Rev. A