Epson GT-9000 Manual de serviço - Página 18
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2.1 Control Circuit
Since the basic component of GT-9600 is same as GT-9500, only
particular items exclusively for GT-9600 are explained here.
2.1.1 Overview of Control Circuit
B077 Main Control Circuit in this scanner uses "16-bit one chip CPU
H8S/2350" as CPU by clock frequency 20Mhz.
B 0 7 7 I S N B o a r d
I n v e r t o r f o r
( C o l o r C C D , A m p . , A / D C o n v e r t o r )
l i g h t s o u r c e
L i g h t S o u r c e
C o n t r o l
H P S e n s o r
C P U
H 8 S / 2 3 5 0
( I C 5 )
M o t o r C o n t r o l l e r
A 3 9 5 6 S L B X 2
( I C 2 6 , 2 7 )
C R M o t o r
S C S I
C o n t r o l l e r
M 6 4 1 5 4 F P
( I C 2 1 )
O p t i o n
S C S I
C o n n e c t o r
Figure 2-1. Block Diagram of Control Circuit
Operating Principles
I m a g e D a t a
C C D C o n t r o l
1 M b i t
S R A M
( I C 1 5 , 1 6 ,
1 9 , 2 0 , 2 2 , 2 3 )
G a t e A r r a y
M E R C U R Y
1 M b i t
( I C 1 2 )
D R A M
( I C 8 , 1 8 )
1 M b i t
P R O M
( I C 6 )
2 5 6 K b i t
S R A M
( I C 7 )
Table 2-1. Functions of Major Elements
Elements
H8S/2350 CPU
MERCURY GA
A64154FP
A3956SLB
Control Circuit
Revision A
Location
Function
This CPU controls this scanner
and is driven by clock frequency
20 MHz. Also, CPU control light
IC5
source and timing for motor
drive. EEPROM and EPROM are
connected to CPU.
This gate array has following
functions.
• Shading Correction
• Gamma Correction
• CCD Sensor Control
• A/D Convertor Control
• Color Correction
• Zoom
• Set Digital Half -Toning
• AAS (Auto area
IC12
segmentation)
• CPU Support
Memory Control
Light quantity Control
• Generates Power On, Reset
signals
• Generates Clock signal
Six 1Mbit SRAM and two
128Mbit DRAM are connected to
this gate array.
IC6
SCSI Controller
IC26, 27
Carriage Motor Driver
12