Read Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual online
ER-A280F/A280N (V)
CIRCUIT DIAGRAM & PWB LAYOUT
8 – 13
■
MAIN PWB I/F & KEYBO
ARD I/F
1/5
C
D
B
A
C
D
B
A
876
5
4
321
8
76
5
4
321
KS1
KS3
KS0
KS2
KS1
KS3
KS0
KS2
KR0
KR7
KR6
KR5
KR4
KR3
KR2
KR1
v5p_STB3#
v5p_STB2#
CHK_KEY
v5p_STB1#
v5p_STB1
1#
a
b
c
d
e
f
g
dp
v5p_STB4#
v5p_STB6#
v5p_STB5#
v5p_STB7#
v5p_STB8#
v5p_STB9#
v5p_STB10#
KR7
KR6
KR5
KR4
CHK_REAR
KR0
KR3
KR2
KR1
CHK_KEY
CHK_KEY
VLED
VLED
VLED
a
b
c
d
e
f
g
dp
v5p_STB1#
v5p_STB2#
v5p_STB3#
v5p_STB4#
v5p_STB5#
v5p_STB6#
v5p_STB7#
v5p_STB8#
v5p_STB9#
v5p_STB10#
v5p_STB1
1#
a
b
c
d
e
f
g
dp
CHK_REAR
from MAIN-PWB
3.3v
signal
from MAIN-PWB
RearDisplay i/f
& KeyBoard i/f
r i
|
5.7v ~ 5.0v
signal
RECEIPT
MISSING-HOLE
GUIDE HOLE 3.5MM
HOLE 3.5MM
SENSOR
GUIDE HOLE 2.0MM
1-2 PIN SHORT :
Only Normal Keyboard
HOLE 1.8MM
MSP2MSP2
A
C
D5
1SS355
D5
1SS355
MT8MT8
MSS10MSS10
3
2
1
2
1
4
5
6
7
8
6
7
8
RP2
10K_x4
+-5%
RP2
10K_x4
+-5%
MH3MH3
MSS23MSS23
F8
T1.6A/250V SEMKO
F8
T1.6A/250V SEMKO
3
2
1
2
1
4
5
6
7
8
6
7
8
RP5
47K_x4
+-5%
RP5
47K_x4
+-5%
3
2
1
2
1
4
5
6
7
8
6
7
8
RP3
10K_x4
+-5%
RP3
10K_x4
+-5%
A
C
D4
1SS355
D4
1SS355
A
C
D23
(1SS355)
D23
(1SS355)
MT9MT9
MH1MH1
MSS29MSS29
A
C
D7
1SS355
D7
1SS355
MSN5MSN5
MT2MT2
MH2MH2
MSS22MSS22
A
1
B
2
C
3
G1
6
G2A
4
G2B
5
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
VCC_5
16
GND
8
IC1
SN74HCT138PW
IC1
SN74HCT138PW
MSS7MSS7
A
C
D6
1SS355
D6
1SS355
A
C
D22
1SS355
D22
1SS355
1
2
+
C1
100uF/16V SKV(6.3x5.5)
+
C1
100uF/16V SKV(6.3x5.5)
MSS14MSS14
MT4MT4
C4
100pF
C4
100pF
MH5MH5
MSP5MSP5
MSS27MSS27
MT7MT7
A
C
D9
1SS355
D9
1SS355
MSS13MSS13
MSS6MSS6
MSS8MSS8
1
TP1
TEST
POINT
TP1
TEST
POINT
MSS26MSS26
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
CN2
00 6208 526 310 000+
CN2
00 6208 526 310 000+
A
C
D8
1SS355
D8
1SS355
MSS1
1
MSS1
1
MSP1MSP1
GND2GND2
3
2
1
2
1
4
5
6
7
8
6
7
8
RP4
47K_x4
+-5%
RP4
47K_x4
+-5%
MSN4MSN4
1
2
3
4
5
6
7
8
9
10
11
12
13
CN1
5229-13CPB(MOLEX)
CN1
5229-13CPB(MOLEX)
R16
0
R16
0
MSS30MSS30
A
C
D10
1SS355
D10
1SS355
A
1
B
2
C
3
G1
6
G2A
4
G2B
5
Y0
15
Y1
14
Y2
13
Y3
12
Y4
11
Y5
10
Y6
9
Y7
7
VCC_5
16
GND
8
IC2
SN74HCT138PW
IC2
SN74HCT138PW
MSS12MSS12
MSS9MSS9
MSP4MSP4
MSS3MSS3
3
2
1
2
1
4
5
6
7
8
6
7
8
RP1
10K_x4
+-5%
RP1
10K_x4
+-5%
MSN1MSN1
C3
0.1uF
C3
0.1uF
MSS28MSS28
MSS24MSS24
C2
0.1uF
C2
0.1uF
MT5MT5
MSN3MSN3
MSS25MSS25
MSS5MSS5
MSS17MSS17
MSS2MSS2
A
C
D1
1SS355
D1
1SS355
GND3GND3
MT6MT6
MSN2MSN2
MT3MT3
MSS20MSS20
MT1MT1
GND1GND1
MSP3MSP3
MT1
1
MT1
1
MSS1MSS1
MSS21MSS21
1
2
3
4
5
6
7
8
9
10
11
CN3
5229-1
1CPB(MOLEX)
CN3
5229-1
1CPB(MOLEX)
MSS19MSS19
MSS15MSS15
A
C
D2
1SS355
D2
1SS355
MSS4MSS4
MT10MT10
MH4MH4
MSS18MSS18
2.
SUB PW
B
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