2

2.4.2 Construction of boards

(a)Construction diagram of boards

This system consists of the following including the SYS board as a main board.

AC input

Control panel

KEY DSP

NIC*

Scanner unit

 

CCD

 

SLG

 

INV

FIL

Main switch

PS-ACC

or

FUS

 

 

Cover opening/closing

 

interlock switch

SYS

IH

LGC

Laser unit

LDR

LRL

SNS

ADU

SFB

HVT

: DC power supply line

* : e-STUDIO350/450 only

: AC power supply line

 

: Signal line

 

Fig. 2-402

(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

2 - 24 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved

OUTLINE OF THE MACHINE

05/11

 

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Toshiba 452, 453, 350, 353 service manual Construction of boards Construction diagram of boards, Function of each board
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350, 353, 453, 452 specifications

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