Service manual

FO-DC600U

[7]

Circuit description of Dual Line Kit (Option: FO-60DL)

1) Block diagram

SURGE

PROTECTION

CIRCUIT

DIODE

BRIDGE

ACTIVE

CHOKE

DETECTOR

+5V

TXA2

MODEM

(FM336PLUS)

RIN

SPKR

TXA1

VREF

RXINRXIN

TXOUT

DUAL LINE

CONTROL

LIU (LINE-2)

XCI1 XCI1

CML1 CML1

CML1

XCI1

SUB ASIC

TXOUT

LINE-2

5 – 20

Fig. 13

2) Circuit description

1. Dual Line Control PWB

2. LIU PWB (Line-2)

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.