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GD-1150/1151/1200/1201/1160/1260 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
ELECTRICAL CIRCUITS
4 - 14
EU/AU/AS/C models
Fig. 4-14
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.
* Values in [ ] are for GD-1151/1201 in case that the descriptions vary between GD-1150/1200 and
GD-1151/1201.
Signal Name Type Active Description Destination
CI1 I - Line 1 CI Detection Signal IC29 [IC26]
CN3
Lb
La
Line
0
1
0
10
3
121
4
9
1
+12V
RLY3
CML relay
CML1
Q4
3
4
3
3
21
417
NCU board FAX board
IC29
[
IC26
]
ASIC
CI1
17
1
2
4
3
AG
Q5
SG
5VPS
R34
R35
CN4
CN501
PC1
ZD3ZD2C8 R4
D2
08/03