Service manual

FO-4700U
FO-47UC
5 – 19
SPMUTE
+5V
SURGE
PROTECTION
CIRCUIT
HS DETECTOR
LINE
EXT.
TEL
1
0
CI DETECTOIN
DB
ACTIVE
CHOKE
1
0
TXOUT
1
0
RXIN
EXTSIG
VREF
TXMUTE
MODEM
(R144AFXL)
CPU
(SH7021)
/EXHS
CML
TXOUT
RXIN
PB3
PB0
PB1
PB8
PB9
1
0
GA(A)
(LZ9FJ59)
VOLC
VOLB
VOLA
PB7
PB4
PB2
PA11
XEXHS
XCI
MPXC
MPXB
CDCMSK
BZCONT
BZOUT
+24VA
DG
DPON
CI
GAINC
CONTROL PWB
LIU PWB
(Example: Fax signal send)
Fig. 6