Ricoh M281 Series, Service Manual

Page: 983 / 1003

Boards
SM 149 D255/D256 FAX OPTION
D255/
D256
F
A
X
OP
TI
ON
5.2 BOARDS
5.2.1 FCU
The FCU (Facsimile Control Unit) controls fax communications, the video interface to the base
copier's engine, and all the fax options.
FACE3.5 (Fax Application Control Engine)

CPU

Data compression and reconstruction (DCR)

DMA control

Clock generation

DRAM backup control
Modem (FAME2)
V.34, V33, V17, V.29, V.27ter, V.21, and V.8
DRAM
The 16 MB of DRAM is shared as follows.

SAF memory: 4MB

Working memory: 4MB

Page memory: 4MB

The SAF memory is backed up by a rechargeable battery.