Read Sharp ER-A450S (serv.man3) Service Manual online
8
7
6
5
4
3
2
1
A
B
C
D
1
2
3
4
5
6
7
8
D
C
B
A
10/12
RS232C CIRCUIT DIAGRAM (OPC2)
VCC
C3
10
10
uF/
1
6
V
C2
71
0.
1u
F
CL
K_US
ART
RES
_
YS
ART
AB1
AB0
/RDH
/W
RH
VCC
VCC
VCC
R3
61
0 oh
m
R3
50
0 oh
m
SL
00
1
SL
01
2
SL
02
3
SL
10
4
SL
11
5
SL
12
6
SL
20
7
SL
21
8
SL
22
9
SL
30
10
SL
31
11
SL
32
12
CD0
13
BRK
0
14
TRN
E
MP0
15
RCV
RDY0
16
TRA
NRDY0
17
CTS
0
18
RCV
DT0
19
VCC
20
GND
21
CI0
22
RTS
0
23
CS0
24
CD1
25
BRK
1
26
TRN
E
MP1
27
RCV
RDY1
28
TRN
RDY1
29
CTS
1
30
RCV
DT1
31
CI1
32
RTS
1
33
CS1
34
CD2
35
TRN
E
MP2
36
RCV
RDY2
37
TRN
RDY2
38
CTS
2
39
RCV
DT2
40
CI2
41
CS2
42
CD3
43
BRK
3
44
TRN
E
MP3
45
RCV
RDY3
46
TRN
RDY3
47
CTS
3
48
RCV
DT3
49
CI3
50
CS3
51
D0
52
D1
53
D2
54
D3
55
GND
56
D4
57
D5
58
D6
59
D7
60
GND
61
VCC
62
X1
63
X2
64
XOUT
65
TRC
K
66
AB0
67
AB1
68
US1
C
H
69
PX
70
POF
71
RSR
Q
72
TRV
73
RXD
A
TA0
74
TX
E
75
TRR
Q
76
TRQ1
77
TRQ2
78
A0
79
A1
80
A2
81
A3
82
A4
83
A5
84
OPT
C
S
85
RD
86
VR
87
RES
88
DB0
89
DB1
90
DB2
91
DB3
92
GND
93
DB4
94
DB5
95
DB6
96
DB7
97
R
98
W
99
VCC
10
0
GND
10
1
RES
10
2
TRN
C
LK
10
3
RCV
CLK
10
4
DBT
S
T
10
5
UTS
T
10
6
CSA
10
7
TRN
D
TA
10
8
DTR
A
10
9
RTS
A
11
0
RCV
DTA
11
1
CTS
A
11
2
DSR
A
11
3
TRN
RDYA
11
4
RCV
RDYA
11
5
TRN
E
MP1
11
6
SYC
BKA
11
7
GND
11
8
CSB
11
9
TRN
D
TB
12
0
DTR
B
12
1
RTS
B
12
2
RCV
DTB
12
3
CTS
B
12
4
DSR
B
12
5
TRN
RDYB
12
6
RCV
RDYB
12
7
TRN
E
MPB
12
8
SYC
BKB
12
9
GND
13
0
CSC
13
1
TRN
D
TC
13
2
DTR
C
13
3
RTS
C
13
4
RCV
DTC
13
5
CTS
C
13
6
DSR
C
13
7
TRN
RDYC
13
8
RCV
RDYC
13
9
TRN
E
MPC
14
0
SYC
BKC
14
1
VCC
14
2
GND
14
3
CSD
14
4
TRN
D
TD
14
5
DTR
D
14
6
RTS
D
14
7
RCV
DTD
14
8
CTS
D
14
9
DSR
D
15
0
TRN
RDYD
15
1
RCV
RDYD
15
2
TRN
E
MPD
15
3
SYC
BKD
15
4
WI
N
15
5
RIN
15
6
RSL
C
T0
15
7
RSL
C
T1
15
8
RST
15
9
MCLK
16
0
IC2
9
OPC2
BRK
1
TRN
E
MP1
RCV
RDY1
TRN
RDY1
/DCD1
/CT
S
1
RCV
DT1
VCC
V
CC
VCC
R3
62
10
K
R3
47
0
R3
43
0
VCC
/CS1
/CS2
VCC
C2
73
33
uF/
1
0
V
"OS"
C2
74
10
uF/
5
0
V
/CS1
BRK
2
TRN
E
MP2
RCV
RDY2
TRN
RDY2
RCV
DT2
/CS2
/CI
1
/RT
S
1
/DCD2
/CT
S
2
/RT
S
2
/CI
2
VCC
0 X 2
C2
77
33
0pF
R3
46
R3
42
10
K
C2
70
33
0pF
BRK
2
TRN
E
MP2
RCV
RDY2
TRN
RDY2
/CS2
BRK
1
TRN
E
MP1
RCV
RDY1
TRN
RDY1
R3
45
RCV
DT2
/DSR2
/DT
R
2
TX
D2
/DSR1
RCV
DT2
R3
65
0
/W
RH
/RDH
/DT
R
1
TX
D1
/W
RH
/RDH
/RES
/RD0
/W
R0
/OPT
CS
VCC
33
0pF
X
2
10
K X
2
R3
63
R3
64
C2
88
C2
89
RCV
DT1
/CS1
A5
A4
D0
D1
D2
D3
D4
D5
D6
D7
D[0..7
]
/POF
F
/IRQ1
/TRQ1
VCC
10
K X
2
X5
9.
83
M
R3
66
1M
FL
1
EMI F
IL
T
ER
R3
49
R3
48
CL
K_US
ART
AB0
AB1
A0
A1
A[0..5
]
10
0pF
X
2
C2
76
C2
75
A3
A2
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