Ricoh A250 Service Manual page 443

PCBS
Modem (Rockwell R288F)
• V.34, V17, V.29, V.27ter, V.21, and V.8
ROM
• 2MB (16 Mbit) flash ROM for system software storage
DRAM
• The 8 MB of DRAM is shared between SAF memory, ECM buffer, page
memory, working memory, line buffer, and so on.
• The SAF memory (2MB) is backed up by a rechargeable battery.
SRAM
• The 128 KB SRAM for system and user parameter storage is backed up by a
lithium battery.
Switches
Item
SW1 Switches the data transfer direction between the FCU and the flash memory
card
SW2 Reset switch, to reboot the FCU board
SW3 Switches the SRAM backup battery on/off
A250
Description
2-22 SM