Pump/Asf Motor Driver Circuit - Epson Stylus COLOR 900 Service Manual

EPSON Stylus COLOR 900/900N

2.3.7 Pump/ASF Motor Driver Circuit

The pump/ASF motor driver IC A3957 (IC13, IC14) enables the
pump/ASF motor to perform 4W1-2 phase excitation.
shows the pump/ASF motor driver circuit block diagram. Note that IC13
drives phase A and IC14 drives Phase B.
E 0 5 B 5 9 ( I C 2 )
P h a s e A s e t t i n g
c u r r e n t s i g n a l
( 1 6 p a t t e r n s )
P h a s e A s p e c i f i e d
s i g n a l
P h a s e B s e t t i n g
c u r r e n t s i g n a l
( 1 6 p a t t e r n s )
P h a s e B s p e c i f i e d
s i g n a l
Figure 2-19
6 9
A S F I A 0
6 8
A S F I A 1
6 2
A S F I A 2
6 4
A S F I A 3
6 3
A S F P H A A
8 1
A S F I B 0
8 0
A S F I B 1
7 2
A S F I B 2
7 4
A S F I B 3
7 3
A S F P H A B
Figure 2-19. Pump/ASF Motor Driver Circuit Block Diagram
A 3 9 5 7 ( I C 1 3 )
2 0
1 5
O U T A
1 3
1 1 2 2
O U T B
8
1 0
R E F
A 3 9 5 7 ( I C 1 4 )
2 0
1 5
1 3
O U T A
1 1
2 2
O U T B
8
1 0
R E F
Chapter 2 Operating Principles
+ 4 2 + 4 2
+ 4 2 + 4 2
C N 1 2
1
A S F A
3
A S F - A
2
A S F B
4
A S F - B
M 6 2 3 8 3 ( I C 1 7 )
4
D / A x y
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