Cambridge Audio 540A V2 - Input PCB Schematic (Tone Control)

Cambridge Audio Azur 540A V2.0 Amplifier
AP17649/5 Input PCB Schematic (Tone Control)
GENERAL NOTES
1.
2.
3.
4.
5.
R20
4k7
R23
1k1
R24
1k1
R17
2k2
R19
2k2
SW2:A
SW-DPDT
Tone Defeat
Out
-15V
+15V
R36
2k2
R35
2k2
R22
4k7
R26
1k1
R25
1k1
R18
2k2
R21
2k2
SW2:B
SW-DPDT
Tone Defeat
-15V
+15V
R37
2k2
R38
2k2
U2
out
Out
-15V
+15V
U2
U4U4 OutOut
U2
+15V
-15V
2
3
1
8 4
U6:A
NE5532N
6
5
7
U6:B
NE5532N
2
3
1
8 4
U5:A
NE5532N
6
5
7
U5:B
NE5532N
U2
6
5
7
U7:B
NE5532N
2
3
1
84
U7:A
NE5532N
RCh In
LCh In
RCh Out
LCh Out
U2
U4
U4
R15
150k
R14
150k
R16
150k
R13
150k
4 6
5
VR3:B
20K MOTORISED DUAL POT
1 3
2
VR3:A
20K MOTORISED DUAL POT
4 6
5
VR4:B
MN20K BALANCE
13
2
VR4:A
MN20K BALANCE
13
2
VR2:A
B5K LINEAR
46
5
VR2:B
B5K LINEAR
13
2
VR1:A
B5K LINEAR
46
5
VR1:B
B5K LINEAR
1
2
3
4
5
6
CN3
H6 2.54mm
TO POWER AMP
C5
47U NP 16V
C11
47U NP 16V
C4
47U NP 16V
C7
47U NP 16V
RCh Out
LCh Out
C103
47N 63V PE
C102
47N 63V PE
C14
47N 63V PE
C16
47N 63V PE
C9
47N 63V PE
C10
47N 63V PE
C18
10P 50V NPO
C23
10P 50V NPO
C8
10P 50V NPO
C13
10P 50V NPO
C19
1N5 63V PE
C20
1N5 63V PE
C22
680N 63V PE
C21
680N 63V PE
LK37
LK15MM
U4
LK25
LK10MM
LK24
LK10MM
LK21
LK15MM
LK19
LK15MM
R33
22R
R34
22R
LK35
LINK15MM
LK20
LK15MM
LK27
LK10MM
LK18
LK15MM
R29
22k
R31
22k
Out
Out
C6
10N PP 63V
C12
10N PP 63V
C3
10N PP 63V
C24
10N PP 63V
C104
10U NP 16V
C101
10U NP 16V
C105
10N PP 63V
C100
10N PP 63V
LK36
LINK15MM
R32
1k5
R30
3k
Out
R27
1k5
R28
3k
Out
C106
10P 50V NPO
C99
10P 50V NPO
C15
100U 25V EL
C17
100U 25V EL
LK33
LK15MM
J3
TERMINAL
1
2
CN17
2MM 2W ST HEADER
3
4
5
RL1:B
ME2-5S
6
7
8
RL1:C
ME2-5S
1
2
RL1:A
ME2-5S
+5VOLTS
D8
1N4004
Q9
MPSA14
R122
10k
R123
1k
MAIN
Amp Mute
Rev2:󰼿RL1,D8,Q9,R122,R123,LK104,107-109󰼿added.
LK16
LK10MM
LK104
LK10MM
LK107
LK10MM
LK108
LK15MM
LK109
LK15MM
86-756-8687998
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