Philips MDV434/55/77 Service Manual page 24

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