Brother MFC 1870MC, Руководство по обслуживанию, Страница: 35 / 217

III –
23
Main PCB Circuit Diagram 3/5
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 array.
1
-5: Input of video data (VID) to the FAX engine
1
-6: Clamp circuitry that gives the bias level to the amplifier of the VID input circuit according to
the CLMP and CPWM signals issued by the CPU (that monitors the current video data
input) for compensating the DC component of video signals for the next scan line.
Working with the FAX engine, this circuitry carries out the standard scanning. (This
circuitry is provided on the FAX1170/1270/1010/1020/MFC1770/1870MC.)
1
-7 SANYO LSI that carries out the high-quality scanning. (Provided on the FAX1570MC/1030/
MFC1970MC)
2
Connector for the thermal recording head
2
-1: Power 5V for the thermal recording head
2
-2: Thermister signals which are normalized by the resistor network and fed to the FAX engine
2
-3: Strobe signals
2
-4: Data signals
2
-5: Ribbon sensor signal
3
Connector for the sensor PCB
3
-1: Paper-edge sensor signal
3
-2: Paper ejection sensor signal
4
Document front and rear sensor circuitry that is active only while the SEON signal is on.
4
-1:PH2, document rear sensor
4
-2:PH1, document front sensor
+ 2 6 V
+ 5 V
R B 1 2 E
L A T C 1 5 C
H R L Y 3 6 E
C P 3 I 1 2 F
H D C 1 2 D
G N D
+ 5 V
C I S
P 9
B 7 B - P H
1
2
9
4
3
S T 1 1 2 D
R I B O N 1 2 D
T M
1
4
1 0
P 5
B 1 1 B - P H
R 1 0 7
3 3 K F
R 1 0 8
1 0 0 K F
R 1 0 5
1 0 K
T G 1 2 E
+ 5 V
G N D
R 5 V
7
V I D 1 2 E
Q 8
2 S C 3 0 5 2
G N D
Q 1 0
K R C 1 0 7 S
R 0 V
Q 1
2 S D 1 8 5 8
R 3
1 W
3 0
C P W M 1 5 D
R 1 0 2
1 0 K
R 1 0 0
2 . 2 K
R 0 V
R 0 V
R 5 V
R 1 0 1
1 0 K
R 5 V
L I G T 1 1 C
R 5 V
R 0 V 6
5
C 8 2
C C 1 0 4
G N D
C 8 5
C C 1 0 1
C 8 6
*
1 1
6
C 8 7
*
S T 2 1 2 D
D O U T 1 2 E
D I N 1 2 E
8
C 8 3
*
R 1 0 6 1 0 0
R 1 0 4 2 0 0
C 8 8
C C 1 0 1
C 8 4
C C 1 0 1
C 8 9
C C 1 0 1
7
2
3
5
G N D
R 0 V
R 1 0 9
1 0 K F
Q 9
2 S K 1 3 9 9
Q 7
2 S C 3 0 5 2
C 8 1 6 V / 1 0
R 9 7 4 7 0
R 9 8 2 7 0
R 5 V
C L M P 1 5 D
R 1 0 3 1 K
R 9 9 2 2 K
C 8 0
C C 1 0 4
R 0 V
R S T H V D D
V D D
V D D
T E M P
A T A P
P O R T 2
P O R T 3
T R I G
D G N D
M T P
S D / P D 7
P D 6
P D 5
P D 1
D 0
D 1
D 2
D 3
D 4
D 5
D 6
D 7
A 0
A 2
A 3
A 4
A G N D
A G N D
A V D D
4 2
4 0
4 1
3 5
3 4
3 1
4 3
1 0
2 4
5 6
9
1 7
2 6
4 9
6 4
4 7
4 8
5 0
5 4
5 9
3 6
4 6
2 0
1 8
1 6
1 5
8
7
6
5
4
3
2
1
R 0 V
R 5 V
R 0 V
# 1 0
L C 8 2 1 0 2 W
D B U S 1 4 E
1 1
1 2
A 5
A 6
A 7
A 8
1 4
1 3
1 9
A 1
P D 4
P D 3
P D 2
5 1
5 2
5 3
S A M P
R S
3 3
6 2
S H
C L K 1
6 3
6 1
C L K 2
6 0
P D 0
5 5
D A C K
5 7
D R E Q
5 8
R D A T 1 2 E
+ 5 V
3 0
2 9
2 8
2 7
2 3
2 2
2 1
2 5
3 2
I C L K
I O C S
M C S
I O E
M E
R D
W R
C L K I N
R E S E T
1 5 D S R A M
3 9
R S T L
A I N
3 8
4 5
4 4
P O R T 0
P O R T 1
3 7
A D R E F L
R 0 V
C 9 9
C C 1 0 4
C 9 8
C C 1 0 4
C 1 0 1
C C 1 0 4
C 8 1
C C 1 0 4
C 7
1 6 v
1 0
R 1 2 3
3 0 0
R 1 2 1
0
R 1 2 2
2 0 0
C 1 0 2
C C 1 0 4
C 1 0 0
*
A 8
R D
W R
C K 1 6
D 7
D 0
D 1
D 2
D 3
D 4
D 5
D 6
D G N D
D G N D
D G N D
D G N D
G N D
M R E Q
I O R Q
R 5 V
1 6 D A B U S
G N D
A 5
A 6
A 7
A 4
A 0
A 2
A 3
A 1
1 4 A R S T L
1 6 B R B U S
1 2 E T G
1 2 E S M C
1 2 E E 1 C S
3 3 F H R L Y
+ 5 V
F R N T 1 2 D
P W O N 1 5 D
C M L H 1 5 B
P H 1
S G - 1 0 5 F 3 0 8
+ 2 6 V
R E A R 1 2 D
P H 2
S G - 1 0 5 F 3 0 8
# 1 3
U M G 5 N
1
3
6
4
2
R 1 2 4
1 0 0 K
R 1 2 8
1 0 0 K
G N D
P 1
B 5 B - P H
B L A C K
1
S E N S O R
3
4
2
G N D
1 2 D F S E N
1 2 D R S E N
4 2 E C M L L
R 1 2 9
1 0 0 K
+ 5 V
G N D
C 1 0 3
C C 1 0 2 B
C 1 0 4
C C 1 0 2 B
R 1 2 6
1 0 0 K
+ 5 V
G N D
C 1 0 9
C C 1 0 2
5
1 2 E S E O N
G N D
Q 1 3
K R C 1 0 7 S
C 1 1 2
*
1 2 3 4 5 6 7 8
2 1 3 4 5 6 7 8
A
B
C
D
E
F
A
B
C
D
E
F
4
4
-1
4
-2
3
-1
3
-2
1
-7
3
1
-4
1
-5
1
-6
1
-1
1
-2
1
-3
1
2
2
-1
2
-2
2
-3
2
-4
2
-3
2
-5