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EPSON GT-9600

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