FO-DC635U
5 – 20
[7] Circuit description of Dual Line Kit
(Option: FO-60DL)
1. Block diagram
2. Circuit description
1) Dual Line Control PWB
The circuit structure of Dual Line Control PWB is the same as that
of Modem Block on the Control PWB, and has G3 FAX communica-
tion function which is similar to that function of Line-1.
2) LIU PWB (Line-2)
LIU PWB (Line-2) is the same unit as LIU PWB (Line-1) and has
line I/F function for Line-2. It is controlled by Control PWB, and the
communication data line is connected to the modem on Dual Line
Control PWB.
SURGE
PROTECTION
CIRCUIT
DIODE
BRIDGE
ACTIVE
CHOKE
HI
LO
CI
DETECTOR
+5V
TXA2
MODEM
(FM336PLUS)
RIN
SPKR
TXA1
VREF
RXIN
RXIN
TXOUT
DUAL LINE
CONTROL
LIU (LINE-2)
HI
XCI1
XCI1
CML1
CML1
CML1
XCI1
SUB ASIC
LO
TXOUT
LINE-2
Fig. 13
Summary of Contents for FO-DC635U
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Page 111: ...FO DC635U 6 24 4 Printer PWB parts layout Bottom side ...
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