Construction Of Boards - Toshiba e-STUDIO182 Service Manual

2.4.2

Construction of boards

[ 1 ] Construction diagram of boards
This system consists of the following including the MAIN board as a main board.
Scanner unit
FUS
PS-ACC
AC input
Main switch
[ 2 ] Function of each board
• MAIN board:
This is the board taking the leading part in all systems. It consists of the SoC, ASIC, memory
(SDRAM, Flash ROM), etc. In the SoC (System control), which is a core of this MAIN board, the
functions of the CPU, image processing, page memory control, CODEC, external interface (USB)
control, etc. are embedded and performed by one chip.
Based on the data input from the control panel, the SoC controls each system, such as the ASIC,
each memory, CIS unit and laser optical unit, and thus permitting the scanning of originals and the
printing of data.
• SRAM board:
This is the board on which the SRAM for storing the user's setting information and counter value and
its backup function are mounted. When the MAIN board is replaced, attaching this board to the new
MAIN board can assume the data of the previous equipment.
• HPNL board:
This is the board on which each button switch and LEDs on the control panel, and the LCD control
circuit are mounted.
• CTRG board:
This is the board on which the IC chip for storing information about the toner cartridge (number of
prints, identification data, etc.) is mounted.
• CTIF board:
This is the interface board with the CTRG board in the toner cartridge. Information written in the IC
chip on the CTRG board is read into the SoC on the MAIN board through this board.
• LDR board:
This is the board on which the laser diode and the ASIC are mounted. The laser is emitted based on
the image data signal output from the SoC on the MAIN board.
e-STUDIO182/212/242
OUTLINE OF THE MACHINE
CIS
SRAM
HVPS
LVPS
Cover opening/closing
interlock switches
: DC power supply line
: AC power supply line
: Signal line
Fig. 2-11
MAIN
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Control panel
HPNL
Toner cartridge
CTIF CTRG
Laser optical unit
LDR
SNS
Automatic duplexing unit
PFC ADU