Toshiba GD-1160 Manuale Utente
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GD-1210/1250/1270/1160/1260
ELECTRICAL CIRCUITS
4 - 11
4
4.2.5
CI detection circuit
NA/TW models
Fig. 4-11
The CI detection circuit consists of the photocoupler (PC2), ASIC (IC29 [IC26]) on the FAX board and
the other peripheral devices to detect a ring signal input from the telephone line.
the 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 telephone
line.
When a ring signal is input from the telephone line, the photocoupler is repeatedly turned ON/OFF. This
allows the CI1 signal to become a pulse signal and input to the ASIC on the FAX board, thereby detect-
ing the ring signal.
line.
When a ring signal is input from the telephone line, the photocoupler is repeatedly turned ON/OFF. This
allows the CI1 signal to become a pulse signal and input to the ASIC on the FAX board, thereby detect-
ing the ring signal.
* Values in [ ] are for GD-1250/1270 in case that the descriptions vary between GD-1210 and GD-
1250/1270.
Signal Name
Type
Active
Description
Destination
CI1
I
-
Line 1 CI Detect Signal
IC29 [IC26]
CN10
Lb
La
Line
0
1
0
1
3
10
12
4
9
1
+12V
RLY2
CML relay
CML1
Q51
3
4
3
3
21
4
17
NCU board
FAX board
IC29
[IC26]
ASIC
CI1
17
1
2
4
3
SG
AG
5VPS
R79
CN9
CN501
PC2
ZD3
ZD1
C1
R2
D52
08/04