
III –
22
Main PCB Circuit Diagram 2/5
1
Connector for the power supply PCB which supplies 25V and 8V.
2
3-terminal regulator which eliminates unstabilized components of the +8V source to
generate stab5V source.
3
Connector for the Ni-MH battery which supplies approx. 5V.
(Provided on the FAX1570MC/1030/MFC1870MC/1970MC)
4
3-terminal regulator which gen5B source from +8V to back up the DRAM
(that stores received data).
(Provided on the FAX1570MC/1030/MFC1870MC/1970MC)
5
Connector for the motor
6
Motor driver
7
Connector for the clutch solenoid (that switches the power transmission).
8
E
2
PROM (32-kilobit for the FAX1570MC/1030/MFC1970MC, 16-kilobit for other mod-
els.)
9
ROM (2-megabit. Note that the qualification machines for demonstration have a 4-
megabit ROM.)
:
DRAMs (1-megabyte, two 4-megabit chips) provided on the FAX1570MC/1030/
MFC1970MC.
A
DRAM (512-kilobyte) provided on the MFC1870MC. The FAX1170/1270/1010/1020/
MFC1770 has its equivalent DRAM on location #7.
1 4 E
D B A S
1 5 A
R A S
1 5 A
C A S
1 5 B
B A R M W E
1 5 B
B A R M R D
1 4 D
D A B U S
G N D
+ 5 V
8
6
7
4
1
2
3
V C C
V S S
S C L
S D A
T E S T
A 2
A 1
A 0
# 4
2 4 L C 1 6 ( 1 8 7 0 M C )
2 4 L C 3 2 ( 1 9 7 0 M C )
1 5 D
E P C K
1 5 D
E P D O
C 9 5
C C 1 0 4
1 6 D
A B U S
1 4 D
D A B U S
+ 5 V
D A 9
V P P
- C E
- O E
- P G M
D A 8
D A 7
D A 6
D A 5
D A 4
D A 3
A 1 1
A 1 0
A 9
A 8
A 7
A 6
A 5
A 4
A 3
A 2
A 1
A 0
D 7
D 6
D 5
D 4
D 3
D 2
D 1
D 0
V C C
G N D
G N D
+ 5 V
1 5 A
R O M C
1 5 A
R M R D
1
3 2
2 2
2 4
1 2
1 1
1 0
9
8
7
6
5
2 7
2 6
2 3
2 5
4
2 8
2 9
1 6
1 3
1 4
1 5
1 7
1 8
3 1
3
2
3 0
1 9
2 0
2 1
# 8
P D 2 7 C 2 0 0 1 B - 1 5
A 0
A 1
A 2
A 3
A 4
A 5
A 6
A 7
A 8
A 9
A 1 0
A 1 1
A 1 2
A 1 3
A 1 4
A 1 5
A 1 6
A 1 7
D 7
D 6
D 5
D 4
D 3
D 2
D 1
D 0
C 5 8
C C 1 0 4
R 7 6
S T D
M O D E L = 0
D . S
M O D E L = *
R 7 7
S T D
M O D E L = *
D . S
M O D E L = 0
5
R 1 2 0
4 . 7 k
O U T 3
I 0
I N 3
C / R
O U T 2
8
1 7
2 5
7
2 1
1
1 5
2 8
2 9
3 0
# 1
M T D 2 0 0 3 F
1 1
2 0
V S A
R S A
V S B
R S B
2 3
4
2 2
V R
I N 1
I N 2
M M 4
2 6
I 1
1 8
I N 4
1 6
+ 2 6 V
1 3
3
5
6
9
1 0
1 2
1 9
2 4
O U T 4
N C
C 1 0 5
C C 1 0 4
P 0 V
B A T
1
2
P 6
B 2 B - P H
B L A C K
C 9 0
C C 1 0 4
G N D
V M M
V M M
V C C
V C C
G N D
R 2
1 / 2 W
1
R 1 1 2
*
R 1 1 0
0
R 1 3 0
2 0 K
R 1 1 1
*
1 4
2
O U T 1
2 7
M M 1
M M 3
M M 2
M B U S
1 6 B
M T I 0
1 2 E
M T V R
1 5 D
N C
N C
N C
N C
N C
N C
N C
M T I 1
1 2 E
+ 2 6 V
S O L
1
2
P 1 3
B 2 B - P H
B L U E
P 0 V
S O L
1 5 D
Q 1 1
*
G N D
Q 2
D T D 1 1 3 Z K
D 3
1 S S 1 2 0
P 2
B 6 B - P H
M O T O R
3
4
2
6
5
1
C 1
3 5 V / 2 2 0
1 0 5
C
C 1 0 7
5 0 v
C C 1 0 4
+ 5 V
+ 5 B
P 0 V
C 9 1
C C 1 0 4
+ 5 V
I N
O U T
G N D
Q 1 2
R H 5 R A 4 7
+ 5 V
R 1
1 / 2 W
1
C 1 0 6
C C 3 3 2 B
D A 9
D A 8
D A 7
D A 6
D A 5
D A 4
D A 3
D A 2
D A 1
D A 0
D 0
D 1
D 2
D 3
A 9
A 8
A 7
A 6
A 5
A 4
A 3
A 2
A 1
A 0
N C
V C C
D Q 5
D Q 7
D Q 8
D Q 6
- R A S
- C A S
- W E
- O E
D A 9
D A 8
D A 7
D A 6
D A 5
D A 4
D A 3
D A 2
D A 1
D A 0
D 4
D 5
D 6
D 7
1 4
8
2 3
7
2 2
1 0
1 1
1 2
1 3
1 6
1 7
1 8
1 9
2 0
9
2 7
2 6
2 5
2 4
2 1
G N D
+ 5 B
# 6
( 1 8 7 0 M C )
H M 5 1 4 8 0 0 J P
C 6 4
C C 1 0 4
2
3
D Q 1
D Q 3
D Q 4
D Q 2
D 0
D 1
D 2
D 3
5
4
1
V C C
1 5
V S S
V S S
N C
2 8
6
A 9
A 8
A 7
A 6
A 5
A 4
A 3
A 2
A 1
A 0
- R A S
- C A S
- W E
- O E
D A 9
D A 8
D A 7
D A 6
D A 5
D A 4
D A 3
D A 2
D A 1
D A 0
4
2 3
3
2 2
9
1 0
1 1
1 2
1 4
1 5
1 6
1 7
1 8
5
G N D
+ 5 B
# 7
( 1 9 7 0 M C )
H M 5 1 4 4 0 0
C 9 4
C C 1 0 4
1
2
D Q 1
D Q 3
D Q 4
D Q 2
D 4
D 5
D 6
D 7
2 5
2 4
1 3
V C C
2 6
V S S
A 9
A 8
A 7
A 6
A 5
A 4
A 3
A 2
A 1
A 0
- R A S
- C A S
- W E
- O E
4
2 3
3
2 2
9
1 0
1 1
1 2
1 4
1 5
1 6
1 7
1 8
5
G N D
+ 5 B
# 5
( 1 9 7 0 M C )
H M 5 1 4 4 0 0
C 9 3
C C 1 0 4
1
2
D Q 1
D Q 3
D Q 4
D Q 2
2 5
2 4
1 3
V C C
2 6
V S S
C 5
1 6 V 4 7
P S
4
1
3
2
P 3
B 4 B - P H
P 0 V
+ 2 6 V
+ 5 V
C 3
1 6 V 4 7
C 9 6
C C 1 0 4
C 9 7
C C 1 0 4
+ 9 V
I N
O U T
G N D
# 3
K I A 7 8 0 5
G N D
D A 1
1 S S 3 7 8
R 1 1 9
*
G N D
R 1 1 3
1 K
+ 9 V
C 4
1 6 V 4 7
G N D
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
1
2
4
3
5
6
7
8
9
A
:
Summary of Contents for MFC 1870MC
Page 4: ...CHAPTER I GENERAL DESCRIPTION ...
Page 10: ...CHAPTER II INSTALLATION ...
Page 11: ...CHAPTER III THEORY OF OPERATION ...
Page 43: ...CHAPTER IV DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 94: ...CHAPTER V MAINTENANCE MODE ...
Page 101: ...V 6 Scanning Compensation Data List MFC1970MC Scanning Compensation Data List Other models ...
Page 148: ...CHAPTER VI ERROR INDICATION AND TROUBLESHOOTING ...
Page 191: ...D Power Supply 100 120V U S A CANADA TAIWAN ...
Page 192: ...D Power Supply 200 240V EUROPE SOUTH AMERICA ...
Page 193: ...D Power Supply 200 240V GULF ASIA CHINA ...
Page 197: ......
Page 203: ......
Page 206: ......