Ricoh D131 - Sg3 Board

SM 211 D619
Memory Back-up
 A rechargeable battery backs up the SAF memory (DRAM) for 12 hours.
 A lithium battery backs up the system parameters and programmed items in the SRAM, in
case the base copier's main switch is turned off.
Switches
Item Description
SW1 Switches the SRAM backup battery on/off.
5.2.2 SG3 BOARD
The SG3 board allows up to three simultaneous communications when used in combination with
the FCU and optional G3 boards. The NCU is on the same board as the common SG-3 board.
This makes the total board structure smaller. But, the specifications of the SG3 board do not
change.
NCCP (New Communication Control Processor)
 Controls the SG3 board.
 CPU (RU30)
 DPRAM (Dual Port RAM): Handshaking with the FCU is done through this block.
 DMA controller
 JBIG