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4-1
A
Front Board Electric Diagram for SD-270
REM1
5
GND
VCC
GND
1
4
GND
IR
CN3
POWER-K
REM
1
VSCK
2
VSTB
3
VSDA
4
5
DV33
4K7/open
6
IR
7
5V
8
9
IR
R3
9P/2.0
10
C4
C5
C1
1000p
0.1u
0.1u
2
VSDA
C1
A1
VSCK
C10
C2
VSTB
C11
E3
C12
E3
C13
E3
C14
D3
C15
F1
B1
C2
C3
B1
C4
A1
C5
A1
B2
C6
C7
B2
C8
C2
C9
C2
A1
CN3
3
D1
D3
D2
D3
LED1
F2
R1
B1
R10
C2
R11
C2
B2
R12
R13
B2
R14
C2
R2
B1
B1
R3
R4
B2
R5
D2
R6
B2
B2
R7
R8
B2
4
R9
C2
REM1
B1
S1
F1
S2
F3
S3
F3
S4
F3
U1
D2
A
B
C
DV33
R1
100
3
2
C2
1
C3
+
R2
0.1u
47uF
5V
R4
FB(0805)
5VL
R12
R13
R14
4.7K
4.7K
4.7K
5VL
R6
100
R7
100
R8
100
C6
C7
C8
100P
100P
100P
C10
0.1u
B
C
D
R5
R11
0
51K
R9
10K
R10
10K
SEG1
SEG2
SEG3
SEG4
C9
SEG5
+
SEG6
SEG7
47uF
1N4148
1N4148
D
4-1
E
POWER-K
C15
NC/101
U1
GRID[1:7]
ET6202
1
28
OSC
GND
GRID1
2
27
DI/O
GRID1
GRID2
3
26
CLK
GRID2
4
25
STB
GND
GRID3
5
24
KEY1
GRID3
GRID4
6
23
KEY2
GRID4
7
22
VDD
GND
5VL
8
21
SEG1/KS1
VDD
GRID5
9
20
SEG2/KS2
SEG14/GRID5
GRID6
10
19
SEG3/KS3
SEG13/GRID6
GRID7
11
18
SEG4/KS4
SEG12/GRID7
12
17
SEG5/KS5
SEG10/KS10
13
16
SEG6/KS6
SEG9/KS9
14
15
SEG7/KS7
SEG8/KS8
SEG[1:9]
S2 open/close
4
D1
KS1
KS1
1
KS2
D2
KS2
KEY2
KEY1
C12
C14
C13
C11
NC/101
NC/101
NC/101
NC/101
E
F
S1 POWER
4
3
1
2
1
LED1
GRID7
1
GRID1
2
GRID6
2
GRID2
GRID5
3
GRID3
GRID4
4
GRID4
GRID3
5
GRID5
GRID2
6
GRID6
GRID1
7
GRID7
SEG9
8
SEG1
SEG8
9
SEG2
SEG10
10
SEG3
SEG1
11
SEG4
SEG2
12
SEG5
SEG3
13
SEG6
SEG4
14
SEG7
SEG5
15
SEG8
SEG6
16
SEG9
SEG7
17
SEG10
LEDZDC6
S3 stop
3
4
3
KEY2
2
1
2
S4 play/pause
4
3
KEY1
1
2
3
4
F
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