Paper Feed Motor Driver Circuit - Epson Stylus 820 Service Manual

Stylus Color IIs / Stylus 820

2.3.2.4 Paper Feed Motor Driver Circuit

The paper feed motor for this printer drives the following mechanisms:
o Paper feed mechanism
o Paper pickup mechanism
o Pump mechanism
Driver IC A2919 (IC16) drives the paper feed motor by constant current. Its principle of operation is the same
as for the carriage motor driver circuit. (However, the drive method is different from the carriage motor's.)
Table 2-13 lists the motor drive method in the CW direction.
Table 2-13. Motor Drive Method (CW Direction)
Step Phase A
1 –
2 +
3 +
4 –
Note: The figure below shows a circuit diagram for the paper feed motor and motor driver IC.
1
RC
Figure 2-26. PF Motor Driver Circuit Diagram
Rev. A
Phase /A
+
–
–
+
23
/B
M
B
20
21
RS (Current Monitor)
Operating Principles
Phase B
–
–
+
+
17
/A
A
14
15
Phase /B
+
+
–
–
2
16
RC
RS
2-25