Brother FAX-170 Service Manual page 33

1 2
C I S
1
A P 7
R 0 V
B 7 B P H
1-1
1
1-2
R 1 2 6 7 5 0
3 R B 1 3 E
R 1 2 3 7 5 0
1-3 4 T G 1 3 E
1 3 B
5
C 1 0 1
6
1 0 4
R 0 V
B
2
* R 1 1 6
V I D
3 7 B
0
+ R 5
7
* R 1 2 1
* R 1 3 4
N C
* Q 1 0
1
N C
R 0 V
* C 9 7
* R 1 2 5
C
N C
R 0 V
* Q 8
* R 1 1 0
N C C L A M P
1 6 D
D
G N C
1-6
+ R 5
S
* Q 9
R 0 V
* C 9 5
N C
N C
G N D
2
+ 5
R 0 V
H 2 6 V
R 1 0 5
T M
3 3 K F
D
9
2-1
R 1 0 6
1 0 0 K F
8 C 9 0
R 1 M
R 1 0 8
2-2 5
8 . 2 K F
4
G N D
2-3
S T 2
2
C 9 4
1 0 2 B
R 1 1 2
1
1 0 0
E 2-4
1 2
C 8 1
1 0 0 P
R 9 8
L 1 4
1 1
M M Z Y 6 0 1 B
1 5 0
2-3
S T 1
1 0
1 3 D
+ 5
C 8 5
1 0 2 B
2-5
3
C 9 1
6 C 8 3
1 0 4
1 0 0 P
7
C 8 8
1 0 4
P 8
F B 1 2 B P H
C 8 7
N C
P 0 V
G N D
1 2
1 Connector for the CIS
1-1: Power for the CIS LED array
1-2: Clock output
1-3: Trigger signal output. One shot of this signal triggers a line of scan.
1-4: LED control signal output circuit which controls the intensity of the CIS LED ar-
1-5: Input of video data (VID) to the FAX engine
1-6: Clamp circuit that gives the bias level to the amplifier of the VID input circuit ac-
Connector for the thermal recording head
2
2-1: Power 26V for the thermal recording head
2-2: Thermister signals which are normalized by the resistor network and fed to the
2-3: Strobe signals
2-4: Data signals
2-5: Power 5V for the logic circuit of the thermal recording head
3 Connector for the motor
Connector for the solenoid (that switches the power transmission)
4
3
G N D
R 1 1 7 R 1 1 5 R 1 2 7
5
L I G T
+ 7 Q 1 1 R 1 3 6
3 . 3 K 1 0 0 D 2 0 9 6 N C
5 6 K -
6 # 1 6
C 9 8
R 1 2 0
N J M 2 1 1 4
1 0 4
2 . 2 K
R 1 3 1
G N D 1 0 0
1-4
D T D
1 1 3 Z K
R 1 2 9
L O N
1 6 D 1 W
2 7
Q 1 3
+ R 5
* R 1 3 7
P 0 V
N C
V I D
* D 6 3 7 B
N C
V I D
2 * Z D 5
2
1 3 E
+ 1
0
- 1-5
3 # 1 6 N C
N J M 2 1 1 4
* R 1 3 2
N C
* C 1 0 3
R 0 V
N C
0
R 0 V
+ 5
1 3 E
* R 1 1 1
N C
* R 1 1 4
C L P W M
1 6 D
N C
3
+ 2 6 V
P 4
B 6 B P H
1
C P 3 I
1 2 E
2
C 9 3
1 0 2 B
3
4
G N D
5
6
1 3 D
M O T O R
D O U T
4
1 3 D
D I N
1 3 D
+ 2 6 V
P O N
1
H D C
1 3 D 4 2 A
C M L L
2
4 1 E
P 3 B 2 B P H
S O L
3
Main PCB Circuit Diagram 3/5
ray.
cording to the CLAMP and CLPWM signals issued by the CPU (that monitors
the current video data input) for compensating the DC component of video sig-
nals for the next scan line
FAX engine
4 5
+ R 5
+ 5
+ 2 6 V
R 0 V
R 1 3 0
8 2 0
1 / 2 W
+ 5
8
R 1 3 5 C 1 0 8 # 1 6
1 / 4 W 1 0 4
N J M 2 1 1 4
1 8
4
6-1
R 0 V
6
R 6 2
+ 5
+ 2 6 V
S G - 1 0 5 F 3 0 8
1 / 2 W
R 3 0
2 . 4 K
1 0 0 K
R E A R
C 5 6
1 3 D
N C
P H 1
+ 5
S G - 1 0 5 F 3 0 8
G N D R 3 7
1 0 0 K
F R N T
1 3 C
P H 2
S E O N
Q 3
K R C 1 0 7 S
6-2
G N D
G N D
+ 2 6 V
5 Z D 3
M T Z J 8 . 2
Z D 4
# 1 2
M T Z J 8 . 2
T D 6 2 0 0 3 P
M B U S
. 9
1 7 B
C O M
5-1
1 6
1 M M 4
0 1 I N 1
1 5 2 M M 3
0 2 I N 2
1 4 3 M M 2
5-2
0 3 I N 3
1 3
4 M M 1
I N 4
0 4
1 2 S O L
5
0 5
I N 5 1 6 D
5-3
1 1 P W O N
6
0 6
I N 6 1 6 D
C M L H
1 0 7
0 7 I N 7
1 6 C
5-4
G N D
8
P 0 V
4 5
III – 26
6 7
Not mounted.
+ R 5
R 1 2 8 R 1 3 3
R 1 2 2
1 5 0 7 5 3 9 0
C 9 9
1 0 4
# 1 5
L C 8 2 1 0 2
C 1 0 7
4 2
4 1
R S T H A T A P
3 8 4 5
P O R T 0
R S T L
1 0 4
3 7
4 4
P O R T 1
A D R E F L
3 9 3 5
A I N P O R T 2
V I D 4 0 3 4
3 3 C , 3 2 B T E M P P O R T 3
+ R 5
4 3 3 3
A V D D S A M P
C 1 0 2
3 6 4 7
1 0 4 A G N D P D 7 / S D
4 6 4 8
A G N D P D 6 / S D C K
5 0
P D 5 / S D E
T G 3 1 5 1
3 2 B T R I G P D 4 / P P 4
A B U S 5 2
P D 3 / P P 3
1 7 D
A 8 1 1 5 3
A 8
P D 2 / P P 2
A 7 1 2 5 4
A 7
P D 1 / P P 1
A 6 1 3 5 5
A 6
P D 0 / P P 0
A 5 1 4
A 5
A 4 1 5 5 7
A 4
D A C K / P P 7
A 3 1 6 5 8
A 3
D R E Q / P P 6
A 2 1 8 5 9
A 2
M T P / P P 5
A 1 1 9
A 1
A 0 2 0 6 0
A 0
C L K 2
6 1
C L K 1
3 0 6 2
1 3 D S M C
I C L K R S
2 9 6 3
1 3 D E 1 C S
I O C S S H
2 8
S B U S
1 6 E S R A M
M C S
1 7 C
I O R Q 2 7 1
I O E D 7
2
M R E Q 2 3
M E
D 6
R D 2 2 3
R D D 5
W R 2 1 4
W R D 4
C K 1 6 2 5 5
C L K I N D 3
3 2
6
1 5 A R E S E T D 2
R S T L 7
D 1
+ 5
1 0 8
V D D
D 0
2 4
V D D
5 6
V D D
9
D G N D
1 7
D G N D
2 6
D G N D
4 9
D G N D
6 4
D G N D
G N D
6 7
8
A
B
C 1 0 5
C 1 0 5
1 0 4
1 6 V 1 0
R D A T R 0 V
1 3 E
C
D 7
D 6
D 5
D 4
D 3
D 2
D 1 D B U S
D 0 D
1 4 E
E
F
8