Epson Stylus 800 Service Manual page 43

2.3.2.5 Paper Feed Motor Driw! Circuit
The paper fked motor lbr this printer drives the tdkmving nwchams "nw
Paper feed mechanism
Pump mechanism
The SMA6501 driver IC (QM1) drives the paper feed motor using a constant voltage, unipolar drive
system. The CPU outputs phase control signals from ports P61O
switching operation. 'Ihe CPU also outputs the supply voltage switching amtrol signal fmm port
Continuous feed
CPU
(lCl)
P611
T03
12
Figure 2-21. Paper Feed Motor Drive Circuit Block Diagram
2-16
Phase Excitation
2-2 phaae
2-2 ptlaae
6
B 2
3
7
6
8
8
10 BP
1
. . . . . . . . .
to
800
650
PF Motor
2
cl
5
PF-A
2
PFB
8
9
PF-B
C4
1
D1
Rev. A