Read Sharp ER-A280 / ER-A280N / ER-A280F (serv.man5) Service Manual online
ER-A280F/A280N (V)
CIRCUIT DIAGRAM & PWB LAYOUT
8 – 10
■
EFT
, B
UZZER,
etc.
10/12
C
D
B
A
C
D
B
A
876
5
4
321
8
76
5
4
321
POFF#5V
EFT_RESET#
LD7
LD6
LD5
LD0
LD1
LD2
LD0
LD7
LD1
LD2
LD3
LD4
LD5
LD6
LD3
LD4
A2
A2
A0
A4
A[0..19]
A13
A3
A8
A10
A7
A17
A4
A5
A11
A18
A3
A14
A6
A5
A15
A19
A9
A12
A0
A1
A16
A1
EFTC#
RD#
WR#
POFF#5V
EFT_RESET#
VCC5
VCC5
VCC3
PE_LED
V_HEAD
VCC5
VCC3
VCC3
VLED
VCC5
LD[0..7]
[2,4]
CS1_EFT#
[2]
EFT_RI#
[8]
WR#
[1,2,3,5]
RD#
[1,2,3,5]
EFT_CTS#
[8]
EFT_DCD#
[8]
EFT_DSR#
[8]
BUZZ
[1]
A[0..19]
[1,2,3,5]
EFT_SIN
[8]
EFTC#
[8]
EFT_SOUT
[8]
EFT_DTR#
[8]
EFT_RTS#
[8]
RD#
[1,2,3,5]
WR#
[1,2,3,5]
DEV_RESET#
[1,2,3,4]
LD2
KR1
[2,4]
LD3
KR0
[1,4]
PESJ#
[2,6]
PESR#
[2,6]
PSTB6
[1,6]
KR7
[2,4]
PTM
[1,6]
PSTB4
[1,6]
PSTB5
[1,6]
PSTB2
[1,6]
OUT_B
[6,7]
OUT_A
[6,7]
OUT_A#
[6,7]
OUT_B#
[6,7]
PR_VH
[6]
PSTB1
[1,6]
PSTB3
[1,6]
KS3
[1,4]
KS2
[1,4]
KS1
[1,4]
LD4
LCD_E
[2,4]
KS0
[1,4]
D_dp
[2,4]
D_g
[2,4]
LD5
LCDON
[2,4]
R/W#
[2,4]
[2,4]
[2,4]
[2,4]
[2,4]
[2,4]
[2,4]
[2,4]
[2,4]
D_f
[2,4]
D_e
[2,4]
D_d
[2,4]
LD6
D_c
[2,4]
D_b
[2,4]
D_a
[2,4]
KR6
[2,4]
LD0
CS1_LCD#
[2,4]
KR5
[2,4]
LD1
CN15_1
[7]
CN15_2
[7]
LD7
KR4
[2,4]
LA0
[2,4]
CHK_KEY
[2,4]
KR3
[2,4]
KR2
[2,4]
POFF#
[1,11zz]
DEV_RESET#
[1,2,3,4]
E
2
DTC114EKA
1
3
B
C
+
GND(1)
OUT(3)
Buzzer-signal
from CPU
EFT
<PRINTER>
CN7 TP
<LCD>
CN10 TP
<KEY>
CN5 TP
CN4 TP
R201
10K
R201
10K
TP115
TP82
TP149
TP73TP73
TP113TP113
TP111
TP97
Q14
2SK3541
Q14
2SK3541
D
G
S
TP68TP68
Q12
DTC114EKA
Q12
DTC114EKA
B
E
C
TP64TP64
TP121TP121
TP104TP104
TP135TP135
TP80TP80
Q13
DTA114EKA
Q13
DTA114EKA
B
E
C
TP72TP72
TP63TP63
D21
1SS355
D21
1SS355
A
C
TP124
BZ1
BUZZER
BZ1
BUZZER
1
2
4
3
R200
(47K)
R200
(47K)
TP105TP105
TP116TP116
TP125TP125
TP95TP95
TP84TP84
J2
53553-0678 [molex]
J2
53553-0678 [molex]
2
1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33
35
37
39
41
43
45
47
49
51
53
55
57
59
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
42
44
46
48
50
52
54
56
58
60
TP151
C145
(100pF)
C145
(100pF)
TP117TP117
+
C147
+
C147
47uF/6.3V SKV(5x5.5)/
MVL(5x5.7)
1
2
TP90TP90
TP94TP94
TP141TP141
TP85TP85
TP74TP74
TP102
TP137
TP138TP138
TP128
TP75TP75
C152
1000pF
C152
1000pF
TP134
TP89TP89
TP99TP99
C146
0.1uF
C146
0.1uF
TP107
TP132TP132
TP66TP66
C167
0.1uF
C167
0.1uF
TP77
TP92
TP70TP70
TP153
TP71TP71
TP87
+
C143
33uF/10V SKV(5x5.5)/MVL(5x5.7)
+
C143
33uF/10V SKV(5x5.5)/MVL(5x5.7)
1
2
TP140
TP100TP100
TP112TP112
TP131
TP79TP79
R198
1K
R198
1K
TP109TP109
TP129TP129
TP120TP120
TP67TP67
TP69TP69
TP65TP65
TP127
TP62TP62
TP108TP108
C142
0.1uF
C142
0.1uF
TP123
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