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4.2.6
Line monitor circuit
NA/TW models
NCU board
RLY2
CML relay
8
T1
4
Lb
9
0
Line
1
3
La
4
0
+12V
AG
1
12
GD-1220/1221
ELECTRICAL CIRCUITS
IC51
R67
R71
Analog
switch
IC53
3
1
4
1
2
1
0
IC53
5
R59
IC52
7
1
1
15
6
7
2
2
0
6
6
R66
13
1
3
14
0
9,11 10
R68
Q51
AG
Speaker
SP+
SP-
Fig. 4-12
FAX board
28,29
[ 25,26 ]
IC2
32
[ 29 ]
MODEM
1
TXOUT1
2
RXIN1
3
IC9
6
3
Analog
switch
13
[ 4 ]
15
R273
14
[ R31 ]
[ 2 ]
R272
15
[ R30 ]
[ 5 ]
R271
12
[ R29 ]
[ 1 ]
R270
1
[ R32 ]
[ 12 ]
IC10
R268
Analog
5
[ R35 ]
switch
[ 15 ]
R267
[ R33 ]
2
[ 14 ]
R266
[ R36 ]
4
IC10
[ R37 ]
[ 13 ]
1
5
3
3
2
AG
11
SG
10
9
© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved
4 - 12
08/08
MAIN board
12
RING
25
IC53
[ 2 ]
[ SPKCLK ]
25
A5
SoC
9,10
TONESEL
59
59
152
11
RING/TONE 23
23
153
ATT3DB1
62
62
142
IC23
IC23
CML1
27
27
144
ASIC
SPVOL0
58
58
151
ASIC
SPVOL1
57
57
150
SPVOL2
24
24
149
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