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3.12 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
K
C
3
1
8
C
1
u
1
C
3
2
3
1
u
M
D I
_ I
K
E
Y
_
B
L
1
M
D I
_ I
K
E
Y
_
B
L
2
I L
G
H
T
V
B
A
T
3
1
9
C
3
2
0
u
1
u
R
3
4
C
3
2
1
C
3
2
2
4
7
1
u
1
u
L
D
3
L
D
3
0
2
L
E
B
B
S -
1
4
H
L
E
B
Figure 3-30 KEY BACK-LIGHT ILLUMINTION
4
R
3
4
5
R
3
4
6
4
7
4
7
L
E
B
B
L
0
1
L
D
3
0
3
B
S -
1
4
H
L
E
B
B
S -
1
4
H
- 43 -
3. TECHNICAL BRIEF
R
3
4
7
R
3
4
8
R
3
4
4
7
4
7
4
7
S -
1
4
H
D
3
0
0
L
D
3
0
4
L
D
L
E
B
B
S -
1
4
H
L
E
B
9
3
0
5
B
S -
1
4
H
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