Construction Of Boards - Toshiba e-STUDIO453 Service Manual

2.4.2 Construction of boards

(a) Construction diagram of boards
2
This system consists of the following including the SYS board as a main board.
AC input
(b) Function of each board
CCD board:
This is the board to convert the reflected light by the original to electrical signals. It consists of the
CCD, and its peripheral circuitry. The CCD converts the reflected light by the original to analog
signal and outputs it to the SLG board.
SLG board:
This is the board to mainly control the scanning function (scanner unit) and consists of the
Scanner-CPU, ASIC, memory (Flash ROM and SRAM), A/D converter, driver for motor drive,
etc. When scanning the original, the exposure lamp and scan motor are driven by the command
from the Scanner-CPU. The analog signal output from the CCD board is then converted to digital
signal by the A/D converter. Image processing is performed by ASIC.
INV board:
This is the board on which the lighting control circuit of the exposure lamp is mounted. The expo-
sure lamp lights by the command from the Scanner-CPU.
DSP board:
This is the board to mainly control the control panel. The panel processing CPU detecting the in-
put from each button and touch panel, and the lighting control circuit for the backlight of the LCD
are mounted. And it relays the control signal of the control panel from the SYS board to the LCD
and KEY board.
e-STUDIO350/352/353/450/452/453
OUTLINE OF THE MACHINE
Control panel
KEY DSP
NIC*
Scanner unit
CCD
SLG
INV
Main switch
FIL
or PS-ACC
FUS
Cover opening/closing
interlock switch
SYS
LGC
IH
: DC power supply line * : e-STUDIO350/450 only
: AC power supply line
: Signal line
Fig. 2-402
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05/11
Laser unit
LDR
LRL
SNS
ADU
SFB
HVT