Ricoh B089 Service Manual page 720

BOARDS
4.2 BOARDS
4.2.1 FCU
Surge
TIP
Protection
Over-
RING
current
Protection
T1
Noise
Filter
T2
The FCU (Facsimile Control Unit) controls fax communications, the video interface
to the base copier's engine, and all the fax options.
FACE2 (Fax Application Control Engine)
• CPU
• Data compression and reconstruction (DCR)
• DMA control
• Clock generation
• DRAM backup control
• Ringing signal/tone detection
FBI (FACE Bridge Interface)
• Interface between the PCI bus and the FACE
• DMA control
Modem (Panasonic MN195006-E)
• V.34, V33, V17, V.29, V.27ter, V.21, and V.8
B576
Noise CML
Filter Relay
Current
Sensor
OHDI SW.
DB1
Surge
Protection
NCU
4-2
JP7
L-
DC Loop
Transformer
JP8
Ring
Detection
Circuit
TRXD
OHDISW
CMLSW
Hook0
Hook1
ExRing
B576D902.WMF
SM