GD-1060 CIRCUIT DESCRIPTION
5 - 12
January 2001 © TOSHIBA TEC
ASD/AUD/CND/MJD models
Fig. 5-4-4
The line path switching control circuit consists of the CML relay (RLY3) and analog switch (IC3, IC5) on
the NCU PWA, the I/O port GA-2 (IC6) on the Main PWA, and other peripheral devices. It changes the
path for facsimile send/receive signals and connects it to each control circuit.
The CML relay is switched according to the CML1 signal output from the I/O port GA-2 on the Main PWA.
When the CML1 signal goes HIGH, Q4 turns on to turn on the CML relay.
The analog switch (IC3) is switched according to the CML1 signal and ATT3DB1 signal. When the CML1
signal or ATT3DB1 signal goes HIGH, the analog switch turns on.
The analog switch (IC5) is switched according to the RLADJ11 and RLADJ12 signals.
The analog switch is switched according to the states of the RLADJ11 and RLADJ12 signals.
Turning on the CML relay and analog switch allows the MODEM to be connected to the line.
AG
Q4
CN3
Lb
La
0
1
0
1
+12V
RLY3
CML relay
+12V
T1
4
3
a2
b2
2
5
13
11
3
10
14
15
16
AG
Ring signal
detection
circuit
0
1
2
3
R28
R29
R31
R32
IC5
Analog switch
C13
C7
R36
C12
R30
C14
RLY4
Relay
IC6
IC7
R11
1
2
13
12
14
15
10
11
0
1
0
1
IC3
Analog
switch
Line current
detection
circuit
CML1
ATT3DB1
RLADJ11
RLADJ21
TX1
RX1
3
1
2
6
IC4
IC6
6
3
2
1
89
90
89
90
76
73
8
7
8
7
78
77
32
28,29
IC6
I/O port GA-2
IC4
MODEM
Main PWA
NCU PWA
CN4
CN3
FAX PWA
CN101
CN6
AG
Q9
External
telephone
Line
05-04-02-E
Signal Name
I/O
Active
Description
Destination
CML1
O
H
CML Relay Control Signal
RLY3, IC3
ATT3DB1
O
H
Attenuator Control Signal
IC3
RLADJ11,2
O
H
Return Loss Adjust Signal
IC5