Epson GT-30000 - Page 26

A3 Size Color Flat Bed Scanner GT-30000 Revision A
OPERATING PRINCIPLES Electrical Circuit Operations 26
Figure 2-3. Control Circuit Composition of GT-30000
PBA-PANEL board
PBA-INS board
LED
x2
HP SCAN
SW
Lamp
PBA-LAMP
board
Emitter
block
Inverter
CCD
µ
PD3728D
CR MOTOR
JR4023P70
Motor Driver
STK672-080 (IC1)
INVERTER
board
x3
(RGB)
Image processing
µ
PD65949S1-079-F6
(IC2)
B106
CONNECT
board
Data Bus
Address
Analog SW
74HC4066AF (x4)x3
(IC27.1^27.4/28.1^28.4/
29.1^29.4)(R/G/B)
A/D conversion
AK8412 x3
(IC24/25/26)(R/G/B)
32k RAM
(Gamma crrctn)
(IC17)
32k+32k RAM x2
(White and Black
standard level)
(IC13/14/15/16)
64M SDRAM x3
(R/G/B)
(IC21/22/23)
SCSI Controller
MB86606 (IC3)
Open
Sensor
32k+32k RAM
(IC6/7)
256k EPRAM
(IC8)
Buffer
x2 (IC5/6)
Data Bus
Address
+3.3V,
+3.3V,+3.3V,
+3.3V,
+5V,
+5V,+5V,
+5V,
+12V,
+12V,+12V,
+12V,
+24V
+24V+24V
+24V
+3.3V,
+3.3V,+3.3V,
+3.3V,
+5V,
+5V,+5V,
+5V,
+12V,
+12V,+12V,
+12V,
+24V
+24V+24V
+24V
SCSI
W I/F
SCSI
N I/F
ID SW
W/N
SW
Terminator
Active Terminator
BH9595FP-Y (IC30/31)
SCSI
ADF I/F
TIA/EIA‑422‑B
TIA/EIA‑422‑BTIA/EIA‑422‑B
TIA/EIA‑422‑B
SN75C1167(IC9)
SN75C1167(IC9)SN75C1167(IC9)
SN75C1167(IC9)
Main CPU
HD6412352F20
(IC1)
128
128128
128x
xx
x16
1616
16
EEPROM
EEPROMEEPROM
EEPROM
(IC33)
(IC33)(IC33)
(IC33)
Document
size
sensors0
Document
size
sensors3
Document
size
sensors5
Document
size
sensors4
Document
size
sensors1
Document
size
sensors2
PWS-
POWER
board
PW
AC85‑140V/170‑264V
AC85‑140V/170‑264VAC85‑140V/170‑264V
AC85‑140V/170‑264V
45‑65Hz
45‑65Hz45‑65Hz
45‑65Hz
IEEE 1394
Option
Board