Toshiba e-STUDIO350 Service Manual page 38

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 exposure
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 input
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-STUDIO350/450 OUTLINE OF THE MACHINE
Control panel
KEY DSP
NIC
Scanner unit
CCD
SLG
INV
Main switch
FIL
PS-ACC
or
FUS
Cover opening/closing
interlock switch
SYS
LGC
IH
: DC power supply line
: AC power supply line
: Signal line
Fig. 2-402
2 - 22
Laser unit
LDR
LRL
SNS
ADU
SFB
HVT
November 2003 © TOSHIBA TEC