Service manual

2.3.2.4 Paper Feed Motor Driver Circuit
The paper feed motor for this printer drives the following mechanisms:
❒ Paper feed mechanism
❒ Paper pickup mechanism
❒ Pump mechanism
Driver IC SLA7043 (IC14) drives the paper feed motor by a constant current. The principle of operation is
same as for the carriage motor driver circuit. However, the paper feed motor drives not only the paper feed
mechanism but also the pump unit. (Refer to Section 2.3.2.4.)
Table 2-3. Paper Feed Motor Drive Modes
Mode Phase Excitation Drive Frequency
Paper feed 2-2 phase or 2W1-2 phase 391 or 1600 pps
Pump drive 2-2 phase 300 or 1800 pps
E05B21
(IC2)
204
201
198
202
PFBSO
PFSTB
CLKA
5
16
2
13
PFASO
SLA7043
(IC14)
CLKB
STBA
STBB
DATA A
DATA B
6
17
PFV0-2
REF A
REF B
PFHOLD
RSA
RSB
3
14
9
10
PFCLK
B
E
A
A
B
B
1
8
11
18
1
2
3
4
+
3
5
V
5
(CN7)
205
GND
Q4
11-13
Figure 2-5. Paper Feed Motor Driver Circuit Block Diagram
Operating Principles Stylus Pro XL+ Service Manual
2-6 Rev.A