Philips MCD908 Service Manual page 18

CIRCUIT DIAGRAM - AMP BOARD
PART 1
standby
R2
0.47/0.5W
CN8 ~12V0
5
R22
4
~12V
3
225V~
2
0V~
1
0.47/0.5W
2.5/5P
CN3
ROT-A
1
ROT-B
2
KEY
3
DGND
4
LED
5
standby
6
PH-MUTE
7
MUTE
8
8P
MUTE
CN2
PH-MUTE
OUT-R
1
OUT-L
2
RIN
3
LIN
4
GND
5
7P/2.0
R51
47K 0.5W
R56
R52
R54 R25
47K 0.5W
RIN
LIN
LED
KEY
DGND
ROT-A
ROT-B
CN12
ROT-B
3
ROT-A
2
DGND
1
2.0/3P
CN13
DGND
2
KEY
1
R55
2.0/2P
8.2K 0.5W
CN14
DGND
1
LED
2
2.0/2P
CN15
DGND
1
LED
2
2.0/2P
9 - 1
Q4
9014
R7
R6
1K
10K
R8
D2 VCC
0
4001 Q6
B772
D3 4001
C3
C2
104
2200u/25V
D7-10
IN4007X4
R23*
+220V
10K0.5W
C9
100uF/400V
R50
0.47/0.5W
+200V
R64
R58
C12
330K/0.5W
330K/0.5W
104 J/450V
Q1A
R60
150K/0.5W
2
2
3
3
12AX7 1/2
R62
C10
560 0.5W
5P
C13
R59 R65
104 J/450V
330K/0.5W
330K/0.5W
Q1B
R61
12AX7 1/2
150K/0.5W
7
7
8
8
C11 12AX7 1/2
R63
5P
560 0.5W
U1
LM7812
+12V
C5
223/100V
+200V
C6 R24
47K/0.5W
100uF/350V
R27
47K/0.5W
C16 1uF/250V
R66
C14 3.3K R67
Q2A
22K
1uF/450V
R71
R70
12AX7 1/2
OUT-R
GND
GND
OUT-L
1uF/250V
R69
22K
C17
R68
3.3K
C15
Q2B
1uF/450V
9 - 1
R37
+12V
100
D1
4148
R1
470K
+12V
R72
220
R4
C19 4.7uF
47K
2.2K
2.2K
R5
C20
47K ZD1
5.1V 47uF
C18
4.7uF
8 1
VDD OUT1
7 2
OUT2 MUTE
6 3
BIAS IN1
5 4
IN2 GND
U3
C21
C33
PT2309
C34
47uF
220uF
220uF
R74
MUTE
R53
4.7K
10K
CN1
3P
R31
1K
Q3
9014
C1
330uF/16V
R75
10K
D6
PH-MUTE
4148
R73
100K
HP-MUTE
JACK1
5
5
4
4
H-OUT L 2
2
H-OUT R 3
3
GND 7
7
8
8
1
1
PH-JACK
Q5
BC817