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EU/AU/AS/C models
NCU board
+12V
4
Lb
Line
3
La
2
a2
External
telephone
5
b2
The dial pulse generation circuit consists of the photocoupler (IC1), the ASIC (IC29 [IC26]) on the FAX
board and the other peripheral devices. It generates the dial pulses in the FAX transmission and dialing
to the outside.
The ASIC makes the CML1 signal become HIGH to connect the line to the MODEM side. To generate
the dial pulses, the ASIC makes the LD1 signal become HIGH to turn ON Q6. This allows the photocou-
pler to come on and the current flows through the line for sending a dial attempt.
Signal Name
Type
LD1
O
* Values in [ ] are for GD-1151/1201 in case that the descriptions vary between GD-1150/1200 and
GD-1151/1201.
GD-1150/1151/1200/1201/1160/1260
ELECTRICAL CIRCUITS
RLY3
CML relay
1
12
+5V
1
5
4
0
3
6
1
IC1
1
8
4
2
9
0
10
Q6
SG
Ring signal
detection
circuit
Fig. 4-10
Active
H
Line 1 Dial Pulse Generation Signal
3
Q4
AG
4
T1
Line path
switching
circuit
AG
Description
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
4 - 10
08/03
FAX board
3
CML1
21
IC29
[ IC26 ]
ASIC
4
LD1
20
Destination
Q6
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