Epson Stylus 1500 - Paper Feed Motor Driver Circuit

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.
B
A
E05B12
(IC2)
UDN2917EB
(IC15)
PF Motor
PFA0
PFA1
PFB0
PFB1
PFAPH
PFBPH
PFV3
PFV2
PFV1
PFV0
VREF1
VREF2
44
25
83
84
88
87
85
86
PFV
PF A
PF_A
PF B
PF_B
A
B
6
3
18
21
I10
I11
I20
I21
PH1
PH2
2
1
23
24
43
26
VBB
92
91
90
89
+5 V
+42 V
22
Figure 2-25. Paper Feed Motor Driver Circuit Block Diagram
Operating Principles
2-22 Rev. A