Service manual

ER-A410U/ER-A420U CIRCUIT DIAGRAM AND PWB LAYOUT
– 23 –
A B
C D
8 7 6 5 4
3
2 1
12345678
D C
B A
LCD I/F 4/7
*IC27 20Pin:VCC
10Pin:GND
A0 A1
D[0..7]
V0
DB0 DB7
D0 D7 D1 D6
DB1 DB6 DB2 DB5
D2 D5
/LE0W D3 D4
/LE1W DB3 DB4 /LE3W D0 D1
/LE0R D2 D3 /LE1R D4 D5
D6 D7
/CS3
A3 /LE1W
/LE2W
P95
D0 /LE2W
D0 D1 DB0
D1 D2 DB1
D2 D3 DB2 D3 D4 DB3
D0 D5 DB4
D1 D6 DB5
D2 D7 DB6
D3 DB7
K GND VCC RSRS
R/WR/W EE DB0 DB1 DB2
DB3
KS0 DB4
D0 D7 DB5
D1 D6 DB6
KS1 E DB7 KS2 R/W
D2 D5 D3 D4
KS3 RS
P96
D0 /LE3R D1 KR0 D2 KR1
D3 KR2 D4 KR3 D5 KR4
D6 KR5 D7 KR6
KR7
DB[0..7]
P95
KS0 KS1 KS2 KS3
/CS3
A0 A1
P94
D[0..7]
/WR
P96
KR0
KR1 KR2
KR3
KR4 KR5
KR6 KR7
/LE0W
A0 A2 A4
A3 A1 A5
/RD
/CS3
/WR
/DR2 /CD2
/CTS2
/
EFTRES
RXD2 /CI2 /EFTC
/POFF
EFTSD
/EFTER
/
EFTRS
/CI2
/CTS2
/DR2 /CD2
KR8
KR9
KR10
KR11
A3
/WR
/RD
VCC
VCC
VCC
VCC
VCC
VLED
VCC
VCC
VCC
VCC
VCC
VCCVCC
C94
100pF
+
C92
22uF/1
0V,OS
+
C83
10uF/50V
C82
0.1uF
IC23
74HC374
1
2
3 4 5 6
7 9
10
8
20 19 18 17 15 16 14 13 12 11
QE Q0 D0 D1 Q1 Q2 D2 Q3 GND D3
VCC
Q7
D7 D6
Q5 Q6
D5 D4
Q4
LE
IC25
74HC374
1
2 3
4
5 6
7
9
10
8
20 19 18 17 15 16 14 13 12 11
QE Q0 D0 D1 Q1 Q2 D2 Q3 GND D3
VCC
Q7
D7 D6
Q5 Q6
D5 D4
Q4
LE
IC21
BA00A
SFP
2 1
4 5
3
CN5
(EFT CN(40Pin) XF2H-4015-
1)
1 3 5 7 9
11 13
15
17 19
21
23
25
27 29 31 33 35
37 39
2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38
40
R94
12K
C89
0.1uF
R90
5.6K
R95
10K
IC26
74HC245
1 2 3 4 5
6
7
9
10
8
20 19 18 17 15 16 14 13 12 11
DIR
A1 A2 A3 A4 A5 A6 A8 GND A7
VCC
1G
B1 B2 B4
B3
B5
B6
B7
B8
IC22
74HC138
1
2
3
4
5 6
7
8
16 9 10 11 12 13 14 15
A B C G2A G2B G1
Y7 GND
VCC
Y6 Y5 Y4 Y3 Y2
Y1 Y0
IC27
74HC244
2
4
6 8
11 13 15 17
1
19
18 16 14 12 9 7 5 3
1A1 1A2 1A3 1A4 2A1 2A2 2A3 2A4 1G 2G
1Y1
1Y2 1Y3 1Y4 2Y1
2Y2
2Y3
2Y4
+
C87
10uF/50V
C86
0.1uF
R96
2.4KF
R92
10K
CN4
LCD CN(16Pin)5483
-16X
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16
R93
10K
+
C85
10uF/50V
C91
100pF
C84
0.1uF
+
C80
22uF/16V
C93
100pF
IC13C
74LV00A
9
10
8
+
C81
10uF/50V
C90
0.1uF
R98
10K
C88
100pF
IC24
74HC245
1
2
3
4
5 6
7 9
10
8
20 19 18 17 15 16 14 13 12 11
DIR
A1 A2 A3 A4 A5 A6 A8 GND A7
VCC
1G
B1 B2 B4
B3
B5 B6 B7
B8
R97
10K