Brother FAX-170 Service Manual page 43

1 2
A
1 1
1 0
C T R L
4 2 C
* R 8 4
9
T R L N C
4 5 A
8
4 2 C
4 1 D
7
4 4 C
B
C L R S T
6
C L C I
5
C L T X S
4
C L C K
3
C L B S Y
2
C L R X S
1
P 1 4
B 1 1 B P H
G N D
C
1
1
G N D C 0 V
2
P 1 5
B 2 B P H
D
E
F
1 2
1 Microphone connector
2 Amplifier and shaper circuit for signals inputted from the microphone.
Analog front end IC which processes the analog I/O signals from/to the MODEM.
3
4 Amplifier circuit for signals outputted from the MODEM.
3
Not mounted.
* R 1 3 8
0
1 4 1 1
A
X C O M
* R 8 9 1 2
X C H 0
* R 8 8 0 1 0
1 3
B
X C H 1
4 . 7 K 1 5
Y C O M
* R 8 7 2
9
C
Y C H 0
* R 8 0 1 0 0 K
1
Y C H 1
* R 8 3
C T S L 2 1 0 0 K 4
Z C O M
T E L S L 5
1 0 0 K
Z C H 0
C T S L 1 3 6
Z C H 1
I N H
* R 8 6
V E E
N C
# 1 1 7
7 4 H C 4 0 5 3 F
1 7 D
1 7 D
1 7 D
G N D
1 7 E
1 3 C
1 3 C
8
V C C
# 1 0
B A 1 0 3 5 8 F
C 5 9 G N D
4
2
+ 5
1 8 2 B
R 7 2
R 9 0
C 6 5
R 7 7
1 . 5 K
1 0 4
1 0 K 2 2 0 K
2
-
1
3
+
1
R 8 1
C 7 3
C 6 9
1 0 K R 7 0
R 9 1 R 7 9
1 0 4
1 8 2 B
4 . 7 K
1 . 5 K 2 2 0 K
2
G N D
G N D
# 1 0
B A 1 0 3 5 8 F
M S S L
4 2 C
3
Main PCB Circuit Diagram 5/5
4 5
C T S E L
1 6 C
C L S E L
1 6 D
+ 5
1 6
V C C
C 6 6
# 1 1
1 0 4
7 4 H C 4 0 5 3 F
G N D
8
G N D
+ 5
C 5 8
1 0 4
G N D
C 5 4
1 0 4
R 2 4
1 0 0 K
* R 7 5
T E L S L
5 2 B
N C
C 5
1 6 V
1 0
G N D
R 7 3
R 6 7
5 6 K
7 5 K
C 5 5
2 2 0 P
R 7 1
6
-
R 5 9
7
5 6 K
5
C 6 0
+
2 K
1 0 2 B
R 6 4
4 . 7 K
# 1 0 C 6 3
B A 1 0 3 5 8 F N C
4
G N D
4 5
III – 30
6 7
3
# 5
T C 3 5 1 3 3 F
1 5 6 D M K
R X I N A D P D M C K
1 6 7 A D M D
C 2 2 D P D M D T
R X I N B
2 2 0 P 2 9 A M K
+ 5 V B I A S A P D M C K
3
1 0 A A M D
C 1 2 T X O U T A P D M D T
1
1 1 C 0
V D D C 3
C 1 4 4
1 2 C 1
1 0 4
1 0 4 V S S 1 C 4
1 4 1 3 C 2
C 5
V S S 2
8
5 A M U T
R S T L
G N D - P D M U T E
1 4 A
6 7
8
A
B
C
M O D E M T B U S
1 4 C
D
E
F
8