Epson Perfection 1200PHOTO, Service Manual

Page: 25 / 94

EPSON Perfection 1200 Revision B
Operating Principles Control Circuit 25
Table 2-4. Control Circuit Block Diagram (USB)
C C D B o a r d
L a m p
&
I n v e r t e r B o a r d
I m a g e D a t a
( R / G / B )
A / D
C o n v e r t e r
( I C 1 5 )
1 2 - b i t
D a t a
E 0 2 A 3 1 E A ( I C 8 )
S R A M
( I C 1 1 )
S D R A M
( I C 1 2 )
C L K ( C R 1 )
C P U ( I C 1 0 )
C L K ( C R 2 )
C R M o t o r
D r i v e r
( I C 4 , 5 )
C R
M o t o r
F l a s h R O M
( I C 6 )
U S B C o n t r o l l e r
( I C 1 3 )
U S B
R e s e t I C
( I C 9 )
S R A M
( I C 7 )
+ 2 4 V
+ 1 2 V
+ 5 V
R e g u l a t o r
( I C 3 )
L V 1
( + 3 . 3 V )
O p t i o n
H . P .
S e n s o r
P C 1
A d d r e s s B u s
D a t a B u s