Cr Motor Driver Circuit - Epson Stylus COLOR 900 Service Manual

EPSON Stylus COLOR 900/900N

2.3.5 CR Motor Driver Circuit

The CR motor drive IC (LB1847: IC12) enables 4W1-2 phase excitation.
A micro stepping motor is used for the CR motor to move the carriage
accurately and also to minimize the motor's vibration during printing.
Figure 2-17
shows the CR motor driver circuit block diagram. Table
2-12 shows the excitation modes used for the CR motor.
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 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 C R A ( B )
s e l e c t i o n s i g n a l
P h a s e C R A ( B )
E N B ( p e r m i s s i o n )
s i g n a l
P h a s e A c o n s t a n t
a t c h o p p i n g
D E C A Y s i g n a l 1
D E C A Y s i g n a l 2
E 0 5 B 5 9 ( I C 2 )
1 4 7
C R I A 0
1 4 8
C R I A 1
1 4 9
C R I A 2
1 5 0
C R I A 3
1 6 3
C R I B 0
1 6 2
C R I B 1
1 6 1
C R I B 2
1 6 0
C R I B 3
1 4 3
C R P H A A
1 7 0
C R P H A B
1 4 4
C R E N B A
1 6 9
C R E N B B
M o t o r s u b c o n t r o l
M D s i g n a l
1 7 1
C R C T L 0
1 7 2
C R C T L 1
1 7 3
C R C T L 2
1 7 4
C R C T L ‚ R
1 7 5
C R C T L ‚ S
N . C .
N o t u s e d
Figure 2-17. CR Motor Driver Circuit Block Diagram
Table 2-12. CR Motor Excitation Modes
Excitation mode
2-2 phase drive LQ print mode
1-2 phase drive Not used
Sort skipping
W1-2 phase drive
SLQ print mode
Wiping
2W1-2 phase drive
Capping
4W1-2 phase drive Moving the CR away from HP
+ 4 2
+ 4 2
L B 1 8 4 7 ( I C 1 2 )
2 5
I A 1
7
2 4
O U T A
I A 2
2 3
I A 3
6
O U T - A
2 2
I A 4
1 8
I B 1
9
1 9
O U T B
I B 2
2 0
I B 3
8
O U T - B
2 1
I B 4
2 7
P H A S E 1
1 6
P H A S E 2
2 6
E N A B L E 1
1 4
1 7
V B B
E N A B L E 2
+ 5
2
V R E F 1
1 3
V R E F 2
2 8
V C C
3
C R 1
1 2
C R 2
1
M D
1 5
D E C A Y 1
5
G N D
S E C A Y 2
1 0
Chapter 2 Operating Principles
Usage Minimum step
1/120" (0.212 mm)
1/240" (0.106 mm)
1/480" (0.053 mm)
1/960" (0.026 mm)
1/1920" (0.013 mm)
+ 4 2
+ 4 2
C N 1 1
1
O U T A
2
O U T - B
O U T - A
3
O U T B
4
+ 4 2
M 6 2 3 8 3 ( I C 1 7 )
8
D / A x y
53