Read Sharp ER-A490 (serv.man4) Service Manual online
6. Circuit diagram
4
1
3
5
6
2
4
1
3
5
6
2
A
B
C
D
EF
G
H
I
A
B
C
D
EF
G
H
I
+5V
+24V
+5
V
RCV
DT
2
73
72
71
70
69
68
67
66
65
74
75
76
77
78
RCVR
D
Y2
T
RNRDY2
BR
K2
64
63
62
61
60
59
58
57
56
55
54
53
52
51
1
11
5
4
J
J4
IC4
75188
IC4
IC4
3
2
FL8
FL7
FL6
FL2
FL4
11
13
12
IC3
75189A
3
2
IC3
6
5
7
100K -4
DTR1
RTS1
TRNDT1
RCVDT1
DSR1
1
2
11
13
RA4
RA4
8
10
9
IC3
(C65)
C63
102
C61
102
CTS1
FL1
FL3
3
9
2
8
4
10
RA4
RA4
IC3
IC5
6
4
13
11
5
12
75189A
C64
102
C66
102
J3
DCD1
CI1
R12
R11
R10
C17
222
1.2K
100K
3.3K
FL5
ER1
RS1
SD1
RD1
DR1
CS1
CD1
CI1
13
8
12
J11
J12
IC7
75188
IC7
IC7
3
2
FL14
FL15
FL16
FL9
FL11
6
4
5
IC5
75189A
11
12
IC6
100K -4
DTR2
RTS2
TRNDT2
RCVDT2
DSR2
6
5
7
RA6
10
9
IC6
(C67)
C68
102
C62
102
CTS2
FL10
FL13
3
12
2
11
4
13
RA6
RA6
IC6
IC6
6
4
1
3
5
2
75189A
C69
102
C70
102
J9
DCD2
CI2
R21
R19
R20
C37
222
1.2K
100K
3.3K
FL12
ER2
RS2
SD2
RD2
DR2
CS2
CD2
CI2
11
13
9
10
8
10
8
9
RA6
FB
C
FB
+
-
+
24V
T800mA
ZD1
RD27EB4
C49
100µ50V
Q1
T1
H6752RC
D2
D3
1
2
3
+5
V
IC9
R24
2.2K
C51
C52
ZD2
100µ/35V x2
RD33EB1
R17
2.7KG
R18
2.2KG
8
1
4
2
3
IC8
9393
R14
10KG
+1
2
V
-12V
+
-
R13
100KG
R15
10K
R16
C28
330P
10K
IC8
9393
7
6
5
ZD3
RD5.1EL1
D1
E352
R22
4.3K
C50
10µ/16V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
NC
NC
NC
36
35
34
33
32
31
30
29
28
27
26
25
NC
NC
RES
RTS1
DSR1
RST
CLOCK
TRNDT1
TRNEMP1
CTS1
BRK1
TRNRDY1
RCVCLK2
DTR2
RTS2
DB4
DB5
DB6
DB7
TRNCLK1
W
CS1
RSLCT0
R
RCVRDY1
RSLCT1
CS2
RCV
DT2
NC
TRNCLK2
RCVRDY2
TRNRDY2
DRK2
CTS
2
TRNEMP2
TRN
DT
2
OPEN
DSR2
48
47
46
45
44
43
42
40
39
38
37
41
NC
GND
RCV
DT1
DB3
DB2
OPE
N
DB1
DB0
VCC
RCVCLK1
NC
DTR
1
NC
NC
NC
+5V
IC
2
MB89371A
79
80
SLO0
SLO1
SLO2
SLI0
SLI1
SLI2
RCVDT1
RCVRDY1
TRNRDY1
BRK1
DB7
DB6
DB5
DB4
GND
DB2
DB1
DB0
TRNEMP1
TRNRDY0
RCVDT0
RCVRDY0
TRNEMP0
BRK0
XOUT
RES
DB3
5
6
8
7
9
4
3
2
1
NC
NC
NC
NC
10
11
12
13
16
15
14
17
18
19
20
RES
OPTCS
D0
D1
D2
D3
D4
D5
D6
D7
GND
21
22
23
24
26
25
27
28
29
30
RSRQ
A0
A1
A2
A3
A4
A5
POFF
TRQ1
WR
NC
31
32
33
34
35
36
37
38
39
40
41
42
43
NC
CS1
AB1
R
AB0
CS0
W
VCC
GND
RTS1
CI1
CD1
CTS
1
CI0
RTS0
PX
44
45
46
47
48
49
50
+5V
+5V
100
99
98
97
96
95
94
93
92
91
90
89
87
86
85
84
83
82
81
88
GND
VCC
CD0
CTS0
NC
CTS1
DCD1
(C2)
(C7)
RES
OPTCS
D0
D1
D2
D3
D4
D5
D6
D7
RSRQ
A0
A1
A5
POFF
WR
TRQ1
A4
A3
A2
(C19)
(C40)
(C39)
RD
RC
103-6
SW1
1
2
3
4
5
6
C29
C30
C31
C32
C15
C14
C13
C12
331 x4
RA3
RA2
10K-6
10K-8
101 x4
101 x4
C11
C10
C9
C8
C33
C34
C46
C45
C44
C43
331 x6
TRNEMP2
TRNRDY1
RCVDT1
RCVRDY1
TRNEMP1
BRK1
RA3
RA5
10K-4
R8
R9
10K
10K
RES
(C47)
C48
103
CS2
AB1
R
AB0
CS1
W
RTS
2
CI2
DCD2
CTS
2
CI1
RTS
1
R7
R6
R5
R4
R2
R3
10K x6
C27
C26
C25
C23
C22
C21
10
1 x6
IC1
F256004PJ
R1
1M
X1
9.83MHz
AB0
AB1
NC
+
+
+
ER-A5RS
47
82P
F
CI
+5
V
JP
1
+5
V
10µ
F
/10V +
3 – 9
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