3. TECHNICAL BRIEF
- 43 -
T
H
G
I
L
K
C
A
B
Y
E
K
H
4
1
S
-
B
B
E
L
5
0
3
D
L
u
1
9
1
3
C
7
4
8
4
3
R
7
4
7
4
3
R
6
4
3
R
7
4
9
4
3
R
7
4
7
4
5
4
3
R
4
0
3
D
L
H
4
1
S
-
B
B
E
L
T
A
B
V
2
2
3
C
u
1
u
1
3
2
3
C
H
4
1
S
-
B
B
E
L
0
0
3
D
L
0
2
3
C
u
1
1
2
3
C
u
1
8
1
3
C
u
1
H
4
1
S
-
B
B
E
L
3
0
3
D
L
4
4
3
R
7
4
1
0
3
D
L
H
4
1
S
-
B
B
E
L
H
4
1
S
-
B
B
E
L
2
0
3
D
L
2
L
B
_
Y
E
K
_
I
D
I
M
1
L
B
_
Y
E
K
_
I
D
I
M
Figure 3-30 KEY BACK-LIGHT ILLUMINTION
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.
Summary of Contents for B2050
Page 7: ... 6 2 PERFORMANCE 2 PERFORMANCE 2 1 H W Features ...
Page 8: ... 7 2 PERFORMANCE ...
Page 9: ... 8 2 PERFORMANCE 2 2 Technical Specification ...
Page 10: ... 9 2 PERFORMANCE ...
Page 11: ... 10 2 PERFORMANCE ...
Page 12: ... 11 2 PERFORMANCE ...
Page 13: ... 12 2 PERFORMANCE ...
Page 57: ... 56 3 Checking Ant SW Mobile SW 4 TROUBLE SHOOTING ...
Page 67: ... 66 TEST POINT 4 6 LCD Trouble 4 TROUBLE SHOOTING ...
Page 70: ... 69 4 TROUBLE SHOOTING TEST POINT 4 7 Speaker Trouble ...
Page 77: ... 76 4 TROUBLE SHOOTING 4 10 KEY backlight Trouble TEST POINT ...
Page 92: ...5 DOWNLOAD AND CALIBRATION 91 5 2 Calibration ...
Page 93: ... 92 5 DOWNLOAD AND CALIBRATION ...
Page 97: ......
Page 103: ... 102 Figure 8 1 B2050 BOTTOM SIDE PCB LAYOUT 8 PCB LAYOUT ...
Page 104: ... 103 8 PCB LAYOUT Figure 8 1 B2050 TOP SIDE PCB LAYOUT ...
Page 105: ......
Page 113: ...10 STAND ALONE TEST 112 ...
Page 117: ......
Page 119: ......
Page 132: ... 131 ...
Page 133: ... 132 ...