Line Monitor Circuit - Toshiba e-STUDIO170F Service Manual

7.4.5

Line Monitor Circuit

US/CA models, SG/HK models
NCU PBA
RLY2
CML relay
1
4 Lb 9
0
Line
1
La
3 4
0
+12V
1
EU/AU models
NCU PBA
RLY3
CML relay
1
4 Lb 4
0
Line
1
La
3 9
0
+12V
1
e-STUDIO170F Circuit Description
IC51
R67 R71
Analog
switch
8 T1 3 1
4 1
0
IC53
R59
5
7 1 1
15 6
2 0
6
AG
12
R66
13 1
14
0
R68
9,11 10
IC51
AG
Speaker
IC6
5 T1 1 2
IC3
8
IC4
6
Analog
switch
IC6
AG
R11
5 7 1 1
12 15
2 0
13 1
14
0
11 10
IC4
AG
Speaker
Main PBA
28,29
IC53
32
MODEM
IC53
2 1 1 T U O X T
IC52
RXIN
7 2 2
6 6
3 3
4
2
5
1
IC10
SP
1 5 3 3 12
IC47
SG
2
Analog
switch
15
SG
14
13
11
10
9
Fig.7-46
Main PBA
28,29
IC53
32
MODEM
1 1 T U O X T
RXIN
7 2 2
6 6
3 3
4
2
5
1
IC10
SP
1 5 3 3 12
IC47
SG
2
Analog
switch
15
SG
14
13
11
10
9
Fig.7-47
7 - 64
IC15
14,2 SPK 136
ASIC
( Engine controller )
IC40
Analog
3
switch
TONESEL
10 31
RING/TONE
11 29
15
ATT3DB
49
IC38
CML
54
ASIC
( I/O port )
SPVOL0
26
SPVOL1
27
R197
SPVOL2
28
R178
R198
R222
R199
R200
R201,
R225
SG
IC15
14,2 SPK 136
ASIC
( Engine controller )
IC40
Analog
3
switch
TONESEL
10 31
RING/TONE
11 29
15
ATT3DB
49
IC38
CML
54
ASIC
( I/O port )
SPVOL0
26
SPVOL1
27
R197
SPVOL2
28
R178
R198
R222
R199
R200
R201,
R225
SG
January 2005 © TOSHIBA TEC