Epson Stylus Color 670, Service Manual

Page: 48 / 152

EPSON Stylus COLOR 670 Revision A
Operating Principles Electrical Circuit Operating Principles 48
2.2.2.3 PF Motor (PF/ PUMP/ ASF Motor) Driver Circuit
The motor driver IC (IC14) on C301MAIN drives PF/ PUMP/ ASF motor. Stylus
COLOR 670 uses 4-phase 48-pole hybrid type stepping motor and performs
constant current bi-polar drive.
ASIC (IC2) converts PF motor phase control signal to LB11847 micro step
drive form and outputs to motor driver IC (IC14) LB11847 from port 107, 118.
Based on this signal, IC14 determines the phase mode.
The current value on each phase is determined by ASIC (IC2) and outputs
from port 109, 110, 111, 113, 114, 115 to driver IC (IC14). Motor driver IC
generates motor driver waveform based on these input signals and controls
the motor.
Figure 2-15. PF Motor Driver Circuit Block Diagram
D A 1
P F E N B A
P F E N B B
P F P H A A
P F P H A B
1 0 8
1 1 6
1 0 7
1 1 8
P F A I 1
P F A I 2
P F A I 3
P F B I 1
P F B I 2
P F B I 3
I A 1
I A 2
I A 3
I A 4
I B 1
I B 2
I B 3
I B 4
P H A S E 1
P H A S E 2
E N B L 1
E N B L 2
V r e f 1
V r e f 2
1 7
2
1 3
2 6
1 6
2 7
2 5
2 4
2 3
2 2
1 8
1 9
2 0
2 1
1 0 9
1 1 0
1 1 1
1 1 3
1 1 4
1 1 5
O U T A
O U T A -
O U T B
O U T B -
7
6
9
8
1 1 2
E 0 5 B 7 0 * *
( I C 2 )
H D 6 4 F 2 3 2 8 F
( I C 1 )
L B 1 1 8 4 7
( I C 1 4 )
R o t o r
1
3
2
4
A
A /
B
B /
C N 7
+ 5 V