Power Output & Speaker Protection - Cambridge Audio 540R V2.0 Service Manual

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R6
R10
S+12V
1.8K
470K
R9
C1
8.2K
47P
10U/16V
C3
R1
R4
L-IN
Q2
Q4
1.5K
820
A970
A970
C2
R3
R2
R5
100K
C4
R8
47K
6.8K
Q1
1K
122M
152M
C2878
C5
FL channel
102
Q3
C2240
R7
R11
1.2K
1.8K
R53
R60
S+12V
1.8K
470K
R58
C18
8.2K
47P
10U/16V
R45
R49
C22
R-IN
Q20
Q23
1.5K
820
A970
A970
C20
R47
R43
100K
R51
C24
R56
47K
6.8K
Q18
1K
122M
152M
C2878
C26
FR channel
102
Q22
C2240
R55
R62
1.2K
1.8K
R54
R61
S+12V
1.8K
470K
R59
C19
8.2K
47P
10U/16V
R46
R50
C23
RS-IN
Q21
Q24
1.5K
820
A970
A970
C21
R48
R44
100K
R52
C25
R57
47K
6.8K
Q19
122M
1K
152M
C2878
C62
102
RS channel
Q52
C180
+
10U/50
C2240
R138
R143
GND
1.2K
1.8K
R137
R142
S+12V
1.8K
470K
R141
C58
8.2K
10U/16V
47P
R133
R135
C60
C-IN
Q51
Q54
1.5K
820
A970
A970
C59
R134
R132
R136
100K
C63
R140
47K
6.8K
Q50
1K
122M
152M
C2878
C61
102
C channel
Q53
C2240
R139
R144
1.2K
1.8K
LS channel
R204
R208
S+12V
1.8K
470K
R207
C83
8.2K
47P
10U/16V
C85
R200
R202
LS-IN
Q74
Q76
1.5K
820
A970
A970
C84
R201
R199
R203
100K
C87
R206
SYS-MUTE
47K
6.8K
Q73
1K
122M
152M
C2878
C86
102
R229
Q75
S+12V
+55V
2.4K/3W
C2240
+
C95
DW15
1N4742A
100U/16
R205
R209
1.2K
1.8K
To enhance viewing, please print to A3
Main Board - Power Output & Speaker Protection PCB Schematic
Cambridge Audio Azur 540R V2.0 AV Receiver
C14
R28
2.2U/50V/NP
C9 47UF/50V
R19
2.2K
+55V
R27
5.6K/0.25W
R21
Q11
R13
4.7/0.5W
C7
2.2K
C2240
47K
C10
12P
R15
R30
R31
Q8
150P
5.6K/0.25W
R20
22K
22K
+ C6
C2073
220
100U/16
Q10
D3
D4
R16
D1
D1047
1N4148
R12
2K
1N4148
1N4148
1.5K
R24
Q6
DW1
C8
R22
0.22/5WX2
K1A
D946BR
6A3
L1
FL
FL-OUT
0.5UH
JZC-42F
20P
DW2
Q7
R17
6A3
R25
D2
A940
10/0.25W
2.7K
1N4148
PH-L
Q5
Q9
C2705
B817
R18
R29
220
R14
C11
R23
22K
100
150P
4.7/0.5W
C13
-55V
2.2U/50V/NP
R90
C32
2.2K
47UF/50V
R74
+55V
R88
5.6K/0.25W
R78
Q35
R65
4.7/0.5W
2.2K
C2240
C29
47K
C34
12P
R68
R93
R95
Q29
150P
22K
22K
5.6K/0.25W
R75
+ C27
C2073
220
100U/16
Q33
D13
D15
R70
D1047
D9
1N4148
1N4148
R63
2K
1N4148
1.5K
R83
Q26
R80
DW3
0.22/5WX2
C31
6A3
K1B
D946BR
L2
FR
FR-OUT
0.5UH
JZC-42F
20P
DW5
6A3
Q28
R72
A940
R85
D11
2.7K
10/0.25W
Q25
1N4148
PH-R
Q31
C2705
B817
R73
R91
220
R67
C36
R82
22K
100
150P
4.7/0.5W
C38
-55V
2.2U/50V/NP
R89
C33 47UF/50V
R76
2.2K
+55V
R87
5.6K/0.25W
R79
Q34
R66
4.7/0.5W
2.2K
C30
C2240
47K
C35
12P
R69
R92
R94
Q30
150P
5.6K/0.25W
R77
22K
22K
+
C2073
C28
Q32
220
100U/16
D1047
D12
D14
R71
1N4148
D10
1N4148
R64
2K
1N4148
1.5K
R84
Q27
R81
DW4
0.22/5WX2
C66
K2A
6A3
D946BR
L4
SR
RS-OUT
0.5UH
DW9
JZC-42F
20P
6A3
Q58
R163
R151
A940
D21
10/0.25W
2.7K
Q55
1N4148
Q61
C2705
B817
R171
R153
220
22K
R147
C70
R159
100
150P
4.7/0.5W
C75
-55V
R168
2.2U/50V/NP
C68
2.2K
47UF/50V
R155
+55V
R167
5.6K/0.25W
R157
Q64
R146
2.2K
C2240
C65
4.7/0.5W
47K
12P
C69
R169
R172
R149
Q60
150P
22K
22K
5.6K/0.25W
R156
C2073
+
C64
220
100U/16
Q63
D23
D24
R150
D20
1N4148
D1047
1N4148
R145
2K
1N4148
1.5K
R161
Q57
R158
DW8
0.22/5WX2
C67
K2B
D946BR
6A3
L5
C POWER
C-OUT
0.5UH
JZC-42F
20P
DW10
6A3
Q59
R152
R162
A940
2.7K
D22
10/0.25W
Q56
1N4148
Q62
C2705
R170
B817
R154
220
22K
R148
C71
R160
100
150P
4.7/0.5W
C74
-55V
R166
2.2U/50V/NP
C91
47UF/50V
2.2K
R217
+55V
R224
5.6K/0.25W
Q83
R219
R211
4.7/0.5W
2.2K
C2240
C89
47K
C92
R226
R228
12P
R213
Q80
150P
22K
22K
5.6K/0.25W
R218
+
C2073
C88
220
Q82
D36
100U/16
D37
R214
D1047
D34
1N4148
1N4148
R210
2K
1N4148
1.5K
R222
Q78
R220
DW13
0.22/5WX2
C90
K3B
6A3
L7
D946BR
SL
LS-OUT
0.5UH
JZC-42F
20P
DW14
Q79
6A3
R215
R223
A940
D35
10/0.25W
2.7K
1N4148
Q77
Q81
C2705
B817
R216
R227
220
R212
C93
R221
22K
100
150P
4.7/0.5W
-55V
R40
MUTE-DELAY
1K
RELAY-STOP
over load
D5
R32
1N4148
47K
R33
47K
Q13
Q12
C2458
C2458
+
R34
C15
10K
470U/10
D17
R103
S+12V
1.8K
1N4148
C39
10U/16V
47P
C43
R96
R100
BS-IN
Q37
1.5K
820
A970
C41
R99
R97
R102
100K
C45
SYS-MUTE
47K
6.8K
Q36
122M
152M
C2878
Q39
BS channel
C2240
R105
1.2K
C76
D16
R179
2.2U/50V/NP
1N4148
2.2K
R181
Q65
C2240
2.2K
D27
R175
R177
22K
22K
1N4148
D30
D28
1N4148
1N4148
D25
1N4148
POWER OUT
CN16
10
BS-OUT
BS
9
LS-OUT
LS
8
RS-OUT
C
7
C-OUT
RS
6
FL-OUT
FL
5
FR-OUT
FR
4
GND
3
GND
2
GND
1
GND
10P2.5
D38
1N4148
R36
1K
+
C171
470U/10
D8
K1C
K2C
K3C
IN4001
J
J
J
C17
JZC-42F
JZC-42F
JZC-42F
R37
104
Q15
10K
C2458
R38
100K
Q16
R35
Q14
C2235
A970
10K
R39
C16
100K
473
+14V
D31
+ C179
1N4148
R198
8.2K
Speaker Protect
220U/16
C52
47UF/50V
R109
R121
+55V
+55V
470K
5.6K/0.25W
R125
R107
R113
C49
4.7/0.5W
8.2K
47K
12P
C54
R116
Q45
150P
5.6K/0.25W
R122
Q41
C2073
+ C47
Q48
A970
220
D1047
100U/16
R118
D18
R106
R112
2K
1N4148
1.5K
R129
Q43
0.22/5WX2
1K
R127
DW6
C51
6A3
D946BR
L3
BS
0.5UH
C46
20P
DW7
Q44
102
6A3
R119
A940
R130
2.7K
D19
10/0.25W
Q42
1N4148
C2705
Q49
R120
B817
220
R111
R115
C56
R128
100
1.8K
150P
4.7/0.5W
-55V
R189
22K
C119
10UF/16V
1
L-IN
2
C115
10UF/16V
3
R-IN
4
C116
10UF/16V
5
LS-IN
6
C117
10UF/16V
7
RS-IN
8
C120
10UF/16V
9
C-IN
10
11
SYS-MUTE
12
C118
10UF/16V
13
BS-IN
14
15
16
3
2
1
RELAY+15V
K3A
BS-OUT
JZC-42F
-55V
CN18
FL
FR
SL
SR
C
SYS-MUTE
BS
AGND
V3-LIN
V3-RIN
16P2.0(180)
CN2
V3-RIN
AGND
V3-LIN
3P(2.0)
TO V3 BRD
17

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