Read Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual online
ER-A280F/A280N (V)
CIRCUIT DIAGRAM & PWB LAYOUT
8 – 9
■
SERIAL I/F - 3,4
9/12
C
D
B
A
C
D
B
A
876
5
4
321
8
76
5
4
321
DCD4
CTS4
RTS4
DTR4
TX_4
RX_4
DSR4
CTS4
RTS4
DTR4
TX_4
RX_4
DSR4
DCD3
RX_3
CTS3
DSR3
TX_3
DTR3
RTS3
DCD3_sp
DSR3
RX_3
DTR3
RTS3
TX_3
CTS3
DCD3_sp
DCD4
RX_4
CTS4
DSR4
TX_4
DTR4
RTS4
CTS3
RTS3
DTR3
TX_3
RX_3
DSR3
DCD4
DCD3
GND-FRAME
GND-FRAME
VCC3
VCC3
VCC5RS
VCC3
VCC3
VCC3
VCC3
GA_RTS3
[2]
GA_SOUT3
[2]
GA_DTR3
[2]
GA_RTS4
[2]
GA_SOUT4
[2]
GA_DTR4
[2]
GA_SIN3
[2]
GA_DCD3
[2]
GA_CTS3
[2]
GA_DSR3
[2]
GA_SIN4
[2]
GA_DCD4
[2]
GA_CTS4
[2]
GA_DSR4
[2]
RJ45 CH3
RJ45 CH4
FPGA-signal
FPGA-signal
FB13
BLM21PG600SN1
TP60
TP50
FB15
BLM21PG600SN1
C122
0.1uF
R194
100
R183
100
C126
0.1uF
TP56
TP59
R182
10K
R191
100
R195
10K
TP48
TP57
C138
1000pF
C136
0.1uF
R184
100
C135
0.1uF
C123
0.1uF
FB12
BLM21PG600SN1
TP61
TP51
TP46
R187
10K
R189
10K
R181
10K
CN14
RJ45
RTS
1
DTR
2
TxD
3
dcd/ri
4
GND
5
RxD
6
DSR
7
CTS
8
FG
9
FG
10
R186
100
C127
0.1uF
TP53
R180
10K
RP32
(10K_x4)
+-5%+-5%
3
2
1
4
5
6
7
8
R190
10K
CN13
RJ45
RTS
1
DTR
2
TxD
3
dcd/ri
4
GND
5
RxD
6
DSR
7
CTS
8
FG
9
FG
10
C132
0.1uF
TP49
C128
1000pF
C133
0.1uF
C139
1000pF
C141
1000pF
C131
1000pF
SP6
ShortPin&Header
1
2
3
R188
10K
FB14
BLM21PG600SN1
C137
0.1uF
TP54
+
C124
10uF/16V SKV(4x5.5)
+
1
2
IC16
ICL3241ECA/3243ECA
C1+
28
C1-
24
C2+
1
C2-
2
T1in
14
T2in
13
T3in
12
R1outB
21
R1out
19
R2out
18
R3out
17
R4out
16
R5out
15
EN#
23
GND
25
VCC
26
V+
27
V-
3
T1out
9
T2out
10
T3out
11
R2outB
20
R1in
4
R2in
5
R3in
6
R4in
7
R5in
8
SHDN#
22
FB10
BLM21PG600SN1
IC17
ICL3241ECA/3243ECA
C1+
28
C1-
24
C2+
1
C2-
2
T1in
14
T2in
13
T3in
12
R1outB
21
R1out
19
R2out
18
R3out
17
R4out
16
R5out
15
EN#
23
GND
25
VCC
26
V+
27
V-
3
T1out
9
T2out
10
T3out
11
R2outB
20
R1in
4
R2in
5
R3in
6
R4in
7
R5in
8
SHDN#
22
TP47
R192
100
TP58
C140
1000pF
C125
0.1uF
FB11
BLM21PG600SN1
C130
1000pF
R185
100
FB16
CIB32P600NE
R193
100
+
C134
10uF/16V SKV(4x5.5)
+
1
2
C129
1000pF
TP55
RP33
(10K_x4)
+-5%+-5%
3
2
1
4
5
6
7
8
TP52
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