Philips MCD908 - Circuit Diagram - Amplifier Board; Amplifier Board Circuit (Part 1)

D7-10
IN4007X4
LIN
RIN
OUT GND IN
U1
LM7812
C2
2200u/25V
1
2
3
4
5
CN8
2.5/5P
225V~
0V~
~12V0
~12V
R50
0.47/0.5W
2
2
3
3
1
1
4
4
5
5
Q1A
12AX7 1/2
7
7
8
8
6
6
9
9
Q1B
12AX7 1/2
R24
47K/0.5W
R27
47K/0.5W
R23*
10K0.5W
C5
223/100V
C6
100uF/350V
+200V
R2
0.47/0.5W
R22
0.47/0.5W
D2
4001
D3 4001
C3
104
+12V
R58
330K/0.5W
C12
104 J/450V
+12V
R54
8.2K/0.5W
R25
47K/ 0.5W
R56
10K/0.5W
C10
5P
R51
47K 0.5W
R60
150K/0.5W
R62
560 0.5W
R64
330K/0.5W
C14
1uF/450V
C16
1uF/250V
Q2A
12AX7 1/2
Q2B
12AX7 1/2
R59
330K/0.5W
C13
104 J/450V
+12V
R55
8.2K 0.5W
R28
47K/ 0.5W
R5710K/0.5W
C11
5P
R61
150K/0.5W
R63
560 0.5W
R65
330K/0.5W
C15
1uF/450V
C17
1uF/250V
R52
47K 0.5W
GND
GND
+220V
C9
100uF/400V
R31
1K
R37
100
R67
22K
R66
3.3K
R69
22K
R68
3.3K
HP-MUTE
GND
H-OUT L
H-OUT R
R70
2.2K
R71 2.2K
ZD1
5.1V
OUT1
1
MUTE
2
IN1
3
GND
4
IN2
5
BIAS
6
OUT2
7
VDD
8
U3
PT2309
C21
47uF
C20
47uF
C34
220uF
C33
220uF
C19 4.7uF
C18
4.7uF
R73
100K
R74
4.7K
R53
10K
OUT-L
OUT-R
1
2
3
CN12
2.0/3P
1
2
CN13
2.0/2P
1
2
CN14
2.0/2P
+12V
1
2
CN15
2.0/2P
MUTE
OUT-L
OUT-R
Q5
BC817
R72
220
R75
10K
D6
4148
PH-MUTE
LIN
RIN
LED
KEY
DGND
ROT-A
ROT-B
R1
470K
Q3
9014
C1
330uF/16V
D1
4148
1 2 3 4
CN1
3P
+12V
GND
1
2
3
4
5
CN2
7P/2.0
MUTE
PH-MUTE
LED
KEY
DGND
ROT-B
ROT-A
1
2
3
4
5
6
7
8
CN3
8P
R5
47K
R4
47K
VCC
Q4
9014
Q6
B772
+200V
standby
R6
10K
R7
1K
COM
1
1
8
8
7
7
3
3
2
2
4
4
5
5
JACK1
PH-JACK
㚚♃ϱկ⬉
DGND
ROT-A
ROT-B
KEY
DGND
LED
DGND
LED
DGND
standby
R8
0
MUTE
PH-MUTE
CIRCUIT DIAGRAM - AMP BOARD
PART 1
9 - 1
9 - 1