Preamp Pcb Schematic - Cambridge Audio 550A Service Manual

VR2:A
3 1
B5k
Balance Pot
R29
1k1 C29
1/4W Metal Film
1.5nF 63V
Polypropylene
LK20
RCh In.
24 AWG
10mm Pitch
R26
R25
4k7
1/4W Metal Film
2k2
1/4W Metal Film
VR1:A
3 1
B5k
Balance Pot
C31
CN2
680nF 63V
1
RCh In. Met. Polyester
2
3
LCh In.
3 Way Shielded
Solder in Shielded Cable Assembly Tone GND
VR2:B
6 4
B5k
Balance Pot
R30
1k1
1/4W Metal Film
C30
LK24
Polypropylene
LK22
1.5nF 63V
LCh In. 24 AWG
24 AWG
R24
4k7
R27
1/4W Metal Film
2k2
1/4W Metal Film
VR1:B
6 4
B5k
Balance Pot
Met. Polyester
C32
680nF 63V
+15V Tone
C25
100uF 25V
LK28 LK29
Electrolytic
24 AWG 24 AWG
10mm Pitch 10mm Pitch
C27
U4 Tone GND
U2
100uF 25V
Electrolytic
-15V Tone
LK34 LK21
24 AWG 24 AWG
10mm Pitch
Tone GND Tone GND
Amp GND Out
R28
1k1
1/4W Metal Film
LK25
24 AWG
10pF 50V
C28
NP0 Ceramic
LK23
24 AWG
+15V Tone
Met. Polyester
R22
C24
47nF 63V
2k2
1/4W Metal Film
3 U5:A
R32
1
2 NE5532P
2k2
Audio Op Amp
1/4W Metal Film
C26
47nF 63V
-15V Tone
Met. Polyester
R31
1k1
1/4W Metal Film
C33
R23
10pF 50V
+15V Tone
2k2
NP0 Ceramic
C19
1/4W Metal Film
U4:A
Met. Polyester
47nF 63V
3
R34
1
2
2k2
1/4W Metal Film
C20
NE5532P
Audio Op Amp
Met. Polyester
47nF 63V
-15V Tone
Cambridge Audio 550A & 650A
2P2T
SW1:B
C15
Pushbutton Switch
NP Electrolytic
R20
47uF 16V
C16
150k
LK30
1/4W Metal Film
24 AWG
10mm Pitch
100nF 100V
Polypropylene
Tone GND
U5:B C22
10nF 63V
Polypropylene
VR3:B
6
7
5 C21
NP Electrolytic
NE5532P
47uF 16V
U2
Audio Op Amp
R21
R33
150k MN20k
2k2 1/4W Metal Film
Balance Pot
1/4W Metal Film
C23
10pF 50V
Tone GND Out
NP0 Ceramic
C13
150k
SW1:A
1/4W Metal Film
R19
NP Electrolytic
47uF 16V
2P2T
Pushbutton Switch
C14
1 00nF 100V
Polypropylene
Tone GND
U4:B
10nF 63V
LK40
C34
Polypropylene
24 AWG
VR3:A
6
10mm Pitch
7
5 C17
NE5532P MN20k
NP Electrolytic
Audio Op Amp R18 Balance Pot
47uF 16V
150k
R35
U4 1/4W Metal Film
2k2
1/4W Metal Film
C18
Tone GND Out
10pF 50V
NP0 Ceramic
ipod input = 282mV
CN13
5
4
2
3
6
C50
7 100pF 50V
NP0 Ceramic
R46
CKX-3.5-07 HP 1 R47
100k
3.5mm Headphone Jack
1/8W Metal Film 100k
1/8W Metal Film
IPOD GND

Preamp PCB Schematic

RCh Out
CN6
CN14 1
3
1
5
2
7
5 3 Vol 1
R VOL IN 9
Vol 2
3 Way
2X5 Way
SIL Male Header
DIL Male Header
Amp GND
Out
C51
R44
2 4k7
L VOL IN
47uF 16V
1/8W Metal Film
NP Electrolytic R45
100k
1/8W Metal Film
R41
1k5
1/8W Metal Film
IPOD GND
R49
10R
+15V Tone
1/8W Metal Film
INPUT BUFFER +18dB
IPOD D GND
IPOD Detect
C49
R40
4k7
47uF 16V
1/8W Metal Film
NP Electrolytic
R42
100k
C71
1/8W Metal Film
100pF 50V
NP0 Ceramic 10R
R38
1/8W Metal Film
-15V Tone
1k5
R43
1/8W Metal Film
IPOD GND
CN4
R37
R POut
1
22R
2
1/4W Metal Film 3
4
5
J3
6
Amp GND
6 Way
LCh Out
Straight Header
R36
22R
L POut
TO POWER AMP
1/4W Metal Film
CN5
2
2 Way
1
Straight Header
2
RCh Out
4
6
LCh Out
8
+15V Tone
10
-15V Tone
Amp GND
CA2
3 Way
Cable Assembly
CT1
Black Cable Tie
CT2
Black Cable Tie
6
U6:B
7
IPOD L
5
NE5532P
Audio Op Amp
R48
10k
1/8W Metal Film
CN9
10pF 50V
C52 NP0 Ceramic 1
C54
2
47uF 25V 3
Electrolytic
3 Way
Straight Header
C53
47nF 63V
IPOD GND
Met. Polyester
U6:A
IPOD GND
2
1
IPOD R
3
NE5532P
Audio Op Amp
C47
47nF 63V
Met. Polyester
C46
47uF 25V
Electrolytic
R39
10k
C48
IPOD GND
1/8W Metal Film
10pF 50V
NP0 Ceramic