Amp Pcb Schematic (Protection) - Cambridge Audio 540A V2 Service Manual

D5
R112
LK43
1N4148
LO
LK7,5MM
100k 8th D8
C55
10U 25V NP
1N4148
L AMP
R63
RO
100k 8th
C54
10U 25V NP
R AMP
Left Protection PCB Connector
CN2 CN8
1 1
H1A H1B VI Output (R) H9A
2 2
H2A H2B H10A
VI Bottom Input (R)
3 3
H3A H3B Amp Output (R) H11A
4 4
H4A H4B VI Top Input (R) H12A
5 5
H5A H5B -45V (R) H13A
6 6
H6B Amp Output (R)
7 7
H7A H7B Clip Output (R) H15A
8 8
H8A H8B H16A
+45V (R)
2,5MM 8W 90 PIN HEADER 2,5MM 8W 90 PIN HEADER 2,5MM 8W 90 PIN HEADER
D27
SPEAKER TEST
1N4004
CN10
1
2
3
R107
4
5
1k 8th
6
D28 R106
H6 2.54mm 1N4004 10k 8th
D26
R105
1N4004
10k 8th
R103
1k 8th
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Cambridge Audio Azur 540A V2.0 Amplifier
+45V P
R42
+45V. R
100k 8th
R77
LK24
PIC DC Detect
DGND LK7,5MM
10k 8th
D7
D6
Q31
1N4148
MPSA42
1N4148
D9
Q30
H14B
MPSA92
RO
1N4148
D10
1N4148
R109
100k 8th
DGND
-45V P
Right Protection PCB Connector
CN3 CN9
H13A H13B
1 1 -45V. R
H9B VI Output (R)
2 2
H10B
VI Bottom Input (R)
3 3
H11B Amp Output (R)
4 4
H12B VI Top Input (R)
5 5
H13B -45V (R)
6 6
H14B Amp Output (R)
7 7
H15B Clip Output (R)
8 8
H16B
+45V (R)
2,5MM 8W 90 PIN HEADER
RL2:A
1
2
12V 8A RELAY
Speaker A Relay
Q34
MPSA14
H4A H4B
R33
+45V. L
91k 8th
R34
C64
LE1
2k2 8th
R83 220P 50V CER
RL1:A
820R 8th
1
H3A H3B
LO
2
12V 8A RELAY
Speaker B Relay
Q35
C63
MPSA14
R81 220P 50V CER
R26
820R 8th
LE2
2k2 8th
R25
-45V. L H2A H2B
91k 8th
AP17653/2 Amp PCB Schematic (Protection)
LK23 H16A H16B
LK7,5MM
R100
15k 8th
Q42
R117
MPSA92
120k 8th
R99
R98
100k 8th
120k 8th
D25
D31
H15BH15A
LK22
1N4148 LK7,5MM
R97
1N4148
R96 120k 8th
Q44
100k 8th
MPSA42
Q43
MPSA42
R116 R118
R95
2k2 8th 100R 8th
15k 8th
LK3 LK4
-45V P
LK20MM 24AWG
TH1
LK20MM 24AWG
LK42
LK7,5MM CN6
ZPP22 100DEG
DGND 1
Mounted on Heatsink
2
3
PIC VI/Short
4
PIC DC Detect
Temp Sense 5
PIC Clip Detect
2,5MM 5W ST HEADER
To input PCB/To PIC
R102
47k 8th
Q37
H12A H12B
R71
MPSA42
+45V. R
R84 91k 8th
R72
LK21
470R 8th
RE1
LK7,5MM
2k2 8th
R93
C65
820R 8th
220U 16V EL
Q36
H11A H11B
MPSA42
RO
R82
470R 8th
R91
R64
820R 8th
C66
RE2
2k2 8th
220U 16V EL
R62
-45V. R H10A H10B
91k 8th
H8A H8B
+45V P
R89
15k 8th R120
Q39
120k 8th
MPSA92
R88
100k 8th
R90
120k 8th
D24 D32
H6B
LO
1N4148 1N4148
R87
R86 120k 8th
Q45
100k 8th
MPSA42
R75
47k 8th
Q38
MPSA42
R119 R121
R85
2k2 8th 100R 8th
15k 8th
H5A H5B
LK30
LK7,5MM
R79
C62
18k 8th
4,7N 50V CER
Q33
H1B H1A
MPSA92
H9B H9A
LK20
LK7,5MM
R101
Q40 47k 8th
MPSA42
R94
R74
470R 8th
C69
18k 8th
220P 50V CER
D18
C68
220U 16V EL
Q41
1N4148
MPSA42
D16
5V1 Zener 400mW
R92
C70
470R 8th
220P 50V CER
DGND
C67
220U 16V EL
H7B H7A
PIC Clip Detect
D17
5V1 Zener 400mW
DGND DGND
+45V R
PIC VI/Short
24