Epson Stylus Photo 720, Руководство по обслуживанию

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EPSON Stylus Photo 720 / EPSON Stylus Photo EX3 Revision A
Operating Principles Electrical Circuit Operating Principles 47
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
Photo 720 / Stylus Photo EX3 uses 4-phase 200-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