Circuit Description Of Dual Line Kit (Fo-60Dl) - Sharp FO-DC600 Service Manual

FO-DC600U
[7] Circuit description of Dual Line Kit (Option: FO-60DL)
1) Block diagram
SURGE
DIODE
LINE-2 PROTECTION
HI BRIDGE
CIRCUIT
LO
CI
DETECTOR
2) Circuit description
1. Dual Line Control PWB
2. LIU PWB (Line-2)
LIU (LINE-2)
TXOUT
ACTIVE
CHOKE
RXIN
+5V
XCI1
CML1
5 – 20
DUAL LINE
CONTROL
TXA2
TXOUT
TXA1
HI
RXIN
RIN
LO
VREF
SPKR
XCI1 XCI1
CML1
Fig. 13
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 communication
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.
MODEM
(FM336PLUS)
CML1
SUB ASIC