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EU/AU/AS/C models
NCU board
RLY3
+12V
CML relay
1
1
4
Lb
4
0
Line
1
3
La
9
0
The CI detection circuit consists of the photocoupler (PC1), ASIC (IC29 [IC26]) on the FAX board and
other peripheral devices to detect a ring signal input from the telephone line.
The ASIC makes the CML1 signal become LOW to connect the CI detection circuit to the line. When a
ring signal is input from the telephone line, the photocoupler is repeatedly turned ON/OFF. This allows
Q5 to be turned ON/OFF and the CI1 signal to become a pulse signal and input to the ASIC on the FAX
board, thereby detecting the ring signal.
Signal Name
Type
CI1
I
* Values in [ ] are for GD-1250/1270 in case that the descriptions vary between GD-1210 and GD-
1250/1270.
GD-1210/1250/1270/1160/1260
ELECTRICAL CIRCUITS
12
3
C8
R4
ZD2
ZD3
10
D2
Fig. 4-12
Active
-
Line 1 CI Detection Signal
4 - 12
08/04
3
Q4
AG
5VPS
R34
1
4
PC1
17
2
3
Q5
R35
SG
Description
© 2006 - 2011 TOSHIBA TEC CORPORATION All rights reserved
FAX board
3
CML1
21
IC29
[ IC26 ]
ASIC
17
CI1
4
Destination
IC29 [IC26]
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