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1
MDV434(K) Front Board
A
+5V
R320
R317
470
10K
Q306
3904
R321
470
R314
18K
C309
0.1u
Q305
Q300
3904
R338
3904.
1K
R318 4.7K
R319
10K
C313
R339
1000p
1K
B
C
FROM MAIN BOARD
CON301
MIC
1
AGND
2
+12V
3
-24V
4
IR
5
DV33
6
GND
7
DATA
8
CS
9
CLK
10
LED-
11
POWER_K
12
CON12(2.0)
C314
47p
D
+12V
-12V
CE200
C200
CE201
C201
22uF
0.1u
22uF
0.1u
MIC200
R200
R201
2
2
1.2K
2.2K
1
1
E
3
C202
3
Q200
3904
100p
C207
D200
1uF/0805
1N4148
R204
R203
R202
1K
8.2K
4.7K
J1
0
AGND
GND
When have no karaoke, this inside of
circle a piece is"OPEN"
F
1
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7-3
2
R341
2.2
+12V
AC2
CE302
R322
470
R324
330
R325
5.6
AC1
Q301
3.3uF/50V
3904
ZD303
R323
CE303
6.2V
10K
3.3uF/50V
C305
0.1u
Q302
-24V
3906
34
35
CE300
C304
C303
R303
R304
R305
R306
36
47uF
0.1u
0.1u
10K
10K
10K
51K
37
+5V
38
39
+
40
ZD301
41
5.1V
42
43
R316
680
44
+12V
CS
R300
100
CLK
R301
100
DATA
R302
100
C302
C301
C300
100p
100p
100p
-24V
C310
CE304
0.1u
22uF/50V
C205
47p
-24V
R210
3.3K
-12V
R205
56K
ZD200
-12V
12V
L200
U302A
2
1
1.8uH
3
C203
NJM4558
C204
NJM4558
100p
RP200
100p
5
R208
+
10K
MIC
7
+12V
C208
6
-
1uF/0805
1K
U302B
R207 6.8K
R206
C206
47p
3.9K
C209 1uF/0805
J2
J3
0
0
AGND
GND
AGND
GND
2
3
4
VFD
VFD-54
AC2
-24V
22
G4
SEG8
PT6312
21
G3
SEG7
20
G2
SEG6/K6
U301
19
G1
SEG5/K5
18
VDD
SEG4/K4
17
LED4
SEG3/K3
16
LED3
SEG2/K2
15
LED2
SEG1/K1
14
LED1
VDD
+5V
13
D301
GND
KEY4
1N4148
12
OSC
KEY3
R311
2.2K
K302
R307
PLAY
R312
2.2K
10K
K303
R308
OPEN/CLOSE
R313
2.2K
10K
STOP
C311
47p
C312
47p
K304
R309
10K
R310
10K
REM301
3
VCC
2
GND
1
IR
REM
1
2
3
4
CON302
CON4(2.0)
R209
680
3
4
7-3
5
DV33
R315
100 ohm
IR
+
C306
CE301
C315
0.1u
47uF
47p
R326 470
LED+
DV33
LED-
GND
POWER_K
C316
47p
5
6
R200
E1
C305
B3
R201
E2
C306
D4
R202
E1
C307
B4
R203
E1
C308
B4
R204
E2
C309
B1
A
R205
E2
C310
D2
R206
E2
C311
C4
R207
E3
C312
C4
R208
E3
C313
B1
R209
E3
C314
D1
R210
E3
C315
D4
R300
C2
C316
E4
R301
C2
CE200
E1
R302
C2
CE201
E2
R303
B3
CE300
B2
R304
B3
CE301
D4
R305
B3
CE302
A2
R306
B3
CE303
A3
R307
B4
CE304
D2
R308
C4
B
J1
F1
R309
C4
J2
F2
R310
C4
J3
F2
R311
B3
L200
E2
R312
B3
Q200
E1
R313
C3
Q300
B2
R314
B1
Q301
B2
R315
D5
Q302
B2
R316
B2
Q305
B1
R317
A1
Q306
A1
R318
B1
D200
E1
R319
B2
D301
B4
R320
A2
D302
B4
R321
A2
ZD200
E3
R322
A2
ZD301
B2
C
R323
A2
ZD303
A2
R324
A2
U302A
E2
R325
A3
U302B
E3
R326
E4
RP200
E2
R338
B1
MIC200
E1
R339
B1
K302
B4
C200
E1
K303
C4
C201
E2
K304
C4
C202
E2
K305
B4
C203
E2
K306
C4
C204
E2
U301
B3
CON301
C1
C205
E2
CON302
E4
C206
E3
REM301
D4
C207
E1
VFD
A3
D
C208
E2
C209
F3
C300
C3
C301
C3
C302
C3
C303
B3
C304
B2
E
F
6
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