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3. TECHNICAL BRIEF
3.13 Key Back-light Illumination
In key back-light illumination, there are 6 Blue LEDs in Main Board, which are driven by
MIDI_KEY_BL1 and MIDI_KEY_BL2 signal from ML2871HB.
K
E
Y
B
A
C
C
3
1
8
1
u
C
1
M
D I
_ I
K
E
Y
M
D I
_ I
K
E
Y
K
I L
G
H
T
V
C
3
1
9
C
3
2
0
1
u
1
u
C
3
2
1
C
3
2
2
3
2
3
1
u
1
u
u
L
D
3
0
2
L
E
B
B
S -
1
4
H
_
B
L
1
_
B
L
2
Figure 3-27 KEY BACK-LIGHT ILLUMINTION
B
A
T
R
3
4
4
R
3
4
5
R
3
4
6
4
7
4
7
4
7
L
D
3
0
1
L
D
3
0
3
L
E
B
B
S -
1
4
H
S -
L
E
B
B
- 44 -
R
3
4
7
R
3
4
8
4
7
4
7
L
E
B
B
S -
1
4
H
L
D
3
0
0
L
D
3
L
E
B
B
S -
1
4
H
1
4
R
3
4
9
4
7
0
4
L
D
3
0
5
H
L
E
B
B
S -
1
4
H
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