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GD-1060 CIRCUIT DESCRIPTION
5 - 14
January 2001 © TOSHIBA TEC
ASD/AUD/CND/MJD models
Fig. 5-4-6
The dial pulse generation circuit consists of the photo-coupler (IC1), the I/O port GA-2 (IC6) on the Main
PWA, and other peripheral devices. It generates dial pulses in facsimile transmission and dialing outside.
The I/O port GA-2 causes the CML1 signal to be HIGH to connect the line to the MODEM side. To
generate dial pulses, the I/O port GA-2 causes the LD1 signal to be HIGH to turn on Q6. This allows the
photo-coupler to turn on and allow current to flow through the line for sending dial make.
CML1
LD1
3
4
AG
Q4
CN3
Lb
La
0
1
0
1
+12V
RLY3
CML relay
4
3
a2
b2
2
5
3
4
73
74
Main PWA
NCU PWA
IC6
I/O port GA-2
Ring signal
detection
circuit
CN4
CN3
IC1
Q6
SG
+5V
External
telephone
Line
05-04-03-E
Signal Name
I/O
Active
Description
Destination
LD1
O
H
Dial Pulse Generate Signal
Q6