EN-44
ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No.
DESCRIPTION OF CHANGE
L282 CT2 Balanced Input.SchDoc
AMP019 Balanced Input
Contact Engineer:
L282CT
08/09/2020
INITIALS
Printed:
2
7
Sheet
of
Notes:
Contact Tel:
(01223) 203201
Jon Henderson
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB25 9QR
Waterbeach
A2
ARCAM
AGND
XLR GND
D100
BAT54S
D102
BAT54S
0W125
R100
47R
0W125
R105
47R
50V
C102
22P
50V
C103
22P
AGND
AGND
50V
C100
100P
50V
C106
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
XLR/RCA*
XLR/RCA*
D114
BAS16
AGND
+11V
TR100
MMBTA06L
0W063
R199
2K2
D104
BAT54S
D106
BAT54S
0W125
R128
47R
0W125
R135
47R
50V
C110
22P
50V
C111
22P
AGND
AGND
50V
C108
100P
50V
C114
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
D108
BAT54S
D110
BAT54S
0W125
R156
47R
0W125
R165
47R
50V
C118
22P
50V
C119
22P
AGND
AGND
50V
C116
100P
50V
C122
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
D112
BAT54S
D113
BAT54S
0W125
R184
47R
0W125
R190
47R
50V
C126
22P
50V
C127
22P
AGND
AGND
50V
C124
100P
50V
C128
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
D101
BAT54S
D103
BAT54S
0W125
R106
47R
0W125
R113
47R
50V
C104
22P
50V
C105
22P
AGND
AGND
50V
C101
100P
50V
C107
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
D105
BAT54S
D107
BAT54S
0W125
R133
47R
0W125
R141
47R
50V
C112
22P
50V
C113
22P
AGND
AGND
50V
C109
100P
50V
C115
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
D109
BAT54S
D111
BAT54S
0W125
R160
47R
0W125
R168
47R
50V
C120
22P
50V
C121
22P
AGND
AGND
50V
C117
100P
50V
C123
100P
AGND
AGND
AGND
AGND
AGND
AGND
+14V
+14V
+14V
-14V
-14V
-14V
UNBAL 7+
UNBAL 7-
UNBAL 7+
UNBAL 7-
UNBAL 3+
UNBAL 3-
UNBAL 3+
UNBAL 3-
UNBAL 5+
UNBAL 5-
UNBAL 5+
UNBAL 5-
UNBAL 4+
UNBAL 4-
UNBAL 4+
UNBAL 4-
UNBAL 6+
UNBAL 6-
UNBAL 6+
UNBAL 6-
UNBAL 2+
UNBAL 2-
UNBAL 2+
UNBAL 2-
UNBAL 1+
UNBAL 1-
UNBAL 1+
UNBAL 1-
INPUT CH7+
INPUT CH7-
1
2
M20-973
CON108
HARWIN
AGND
50V
C136
100N
50V
C150
100N
AGND
+14V
-14V
50V
C137
100N
50V
C151
100N
50V
C138
100N
50V
C152
100N
50V
C139
100N
50V
C153
100N
50V
C140
100N
50V
C154
100N
50V
C141
100N
50V
C155
100N
50V
C142
100N
50V
C156
100N
INPUT CH7+
+14V
AGND
+14V
AGND
+11V
P204
-14V
AGND
XLR GND
AGND
XLR GND
AGND
XLR GND
AGND
XLR GND
AGND
XLR GND
AGND
XLR GND
0W063
R201
0R0
XLR GND
R200
CH GND AGND
NF
1
2
3
VH
CON107
JST
2
3
1
8
4
IC100A
LME49723MA
6
5
7
IC100B
LME49723MA
2
3
1
8
4
IC101A
LME49723MA
6
5
7
IC101B
LME49723MA
2
3
1
8
4
IC102A
LME49723MA
6
5
7
IC102B
LME49723MA
2
3
1
8
4
IC103A
LME49723MA
6
5
7
IC103B
LME49723MA
2
3
1
8
4
IC104A
LME49723MA
6
5
7
IC104B
LME49723MA
2
3
1
8
4
IC105A
LME49723MA
6
5
7
IC105B
LME49723MA
2
3
1
8
4
IC106A
LME49723MA
6
5
7
IC106B
LME49723MA
0W125
R108
0R0
NF
NF
NF
NF
NF
NF
NF
NF
NF
NF
NF
NF
NF
NF
0W125
R120
0R0
0W125
R138
0R0
0W125
R147
0R0
0W125
R166
0R0
0W125
R176
0R0
0W125
R191
0R0
0W125
R196
0R0
0W125
R114
0R0
0W125
R125
0R0
0W125
R142
0R0
0W125
R154
0R0
0W125
R170
0R0
0W125
R181
0R0
0W25
R189
27R
0W1
0.10%
R111
2K0
0W1
0.10%
R122
2K0
0W1
0.10%
R140
2K0
0W1
0.10%
R150
2K0
0W1
0.10%
R169
2K0
0W1
0.10%
R180
2K0
0W1
0.10%
R192
2K0
0W1
0.10%
R198
2K0
0W1
0.10%
R115
2K0
0W1
0.10%
R127
2K0
0W1
0.10%
R143
2K0
0W1
0.10%
R155
2K0
0W1
0.10%
R171
2K0
0W1
0.10%
R183
2K0
P103
P111
P100
P107
P101
P120
P102
P121
P115
P105
P
10
4
P106
P
11
3
P108
P117
P109
P127
P110
P128
P119
P132
P114
P130
P
11
2
P
11
8
P116
P
12
9
P
13
3
P131
P136
P143
P137
P146
P134
P154
P148
P138
P158
P156
P
13
5
P
14
7
P
15
5
P
16
2
P139
P157
P144
P150
P140
P151
P141
P159
P153
P145
P
14
2
P
15
2
P149
P164
P161
P
16
0
P
16
5
P163
P166
P177
P167
P178
P168
P186
P181
P193
P170
P188
P
16
9
P
18
0
P174
P171
P182
P172
P184
P173
P189
P185
P196
P176
P192
P
17
5
P
18
3
P179
P
19
1
P
19
7
P195
P198
P205
P199
P206
P200
P210
P208
P202
P212
P214
P
20
1
P
20
7
P203
P
21
1
P
21
6
P213
P219
P220
P221
P215
P
21
7
P218
P190
P187
P194
P123
P126
P122
P125
P124
G6K-2F-TR DC12
RLY100A
OMRON
G6K-2F-TR DC12
RLY100B
OMRON
G6K-2F-TR DC12
R
LY
10
0C
OMRON
G6K-2F-TR DC12
RLY101A
OMRON
G6K-2F-TR DC12
RLY101B
OMRON
G6K-2F-TR DC12
R
LY
10
1C
OMRON
G6K-2F-TR DC12
RLY102A
OMRON
G6K-2F-TR DC12
RLY102B
OMRON
G6K-2F-TR DC12
R
LY
10
2C
OMRON
G6K-2F-TR DC12
RLY103A
OMRON
G6K-2F-TR DC12
RLY103B
OMRON
G6K-2F-TR DC12
R
LY
10
3C
OMRON
G6K-2F-TR DC12
RLY104A
OMRON
G6K-2F-TR DC12
RLY104B
OMRON
G6K-2F-TR DC12
R
LY
10
4C
OMRON
G6K-2F-TR DC12
RLY105A
OMRON
G6K-2F-TR DC12
RLY105B
OMRON
G6K-2F-TR DC12
R
LY
10
5C
OMRON
G6K-2F-TR DC12
RLY106A
OMRON
G6K-2F-TR DC12
RLY106B
OMRON
G6K-2F-TR DC12
R
LY
10
6C
OMRON
25V
C129
10uF
25V
C130
10uF
25V
C131
10uF
25V
C132
10uF
25V
C133
10uF
25V
C134
10uF
25V
C135
10uF
25V
C143
10uF
25V
C144
10uF
25V
C145
10uF
25V
C146
10uF
25V
C147
10uF
25V
C148
10uF
25V
C149
10uF
25V
C125
10uF
35V
C157
47UF
35V
C158
47UF
3
2
1
G
1
2
3
DY-08
CON100
3
2
1
G
1
2
3
DY-08
CON101
3
2
1
G
1
2
3
DY-08
CON102
3
2
1
G
1
2
3
DY-08
CON103
3
2
1
G
1
2
3
DY-08
CON104
3
2
1
G
1
2
3
DY-08
CON105
3
2
1
G
1
2
3
DY-08
CON106
19_E007
JH
12/02/2019
G.0
Net name changes
19_E027
PK
20/05/19
1.0
47R changed to 120R to change gain. Input resistors changed to TF
0W125
Thin Film
R101
1K0
0W125
Thin Film
R103
22K
0W125
Thin Film
R116
1K0
0W125
Thin Film
R118
22K
0W125
Thin Film
R129
1K0
0W125
Thin Film
R131
22K
0W125
Thin Film
R144
1K0
0W125
Thin Film
R146
22K
0W125
Thin Film
R157
1K0
0W125
Thin Film
R159
22K
0W125
Thin Film
R172
1K0
0W125
Thin Film
R174
22K
0W125
Thin Film
R185
1K0
0W125
Thin Film
R187
22K
0W125
Thin Film
R193
1K0
0W125
Thin Film
R195
22K
0W125
Thin Film
R107
1K0
0W125
Thin Film
R110
22K
0W125
Thin Film
R121
1K0
0W125
Thin Film
R124
22K
0W125
Thin Film
R134
1K0
0W125
Thin Film
R137
22K
0W125
Thin Film
R149
1K0
0W125
Thin Film
R152
22K
0W125
Thin Film
R161
1K0
0W125
Thin Film
R164
22K
0W125
Thin Film
R175
1K0
0W125
Thin Film
R179
22K
0W125
Thin Film
R102
120R
0W125
Thin Film
R104
120R
0W125
Thin Film
R117
120R
0W125
Thin Film
R119
120R
0W125
Thin Film
R130
120R
0W125
Thin Film
R132
120R
0W125
Thin Film
R145
120R
0W125
Thin Film
R148
120R
0W125
Thin Film
R158
120R
0W125
Thin Film
R162
120R
0W125
Thin Film
R173
120R
0W125
Thin Film
R177
120R
0W125
Thin Film
R186
120R
0W125
Thin Film
R188
120R
0W125
Thin Film
R194
120R
0W125
Thin Film
R197
120R
0W125
Thin Film
R109
120R
0W125
Thin Film
R112
120R
0W125
Thin Film
R123
120R
0W125
Thin Film
R126
120R
0W125
Thin Film
R136
120R
0W125
Thin Film
R139
120R
0W125
Thin Film
R151
120R
0W125
Thin Film
R153
120R
0W125
Thin Film
R163
120R
0W125
Thin Film
R167
120R
0W125
Thin Film
R178
120R
0W125
Thin Film
R182
120R
19_E040
PK
02/12/19
2.0
PCB change only
INPUT CH7-
INPUT CH6+
INPUT CH6-
INPUT CH6+
INPUT CH6-
INPUT CH5+
INPUT CH5-
INPUT CH5+
INPUT CH5-
INPUT CH4+
INPUT CH4-
INPUT CH4+
INPUT CH4-
INPUT CH3+
INPUT CH3-
INPUT CH3+
INPUT CH3-
INPUT CH2+
INPUT CH2-
INPUT CH2+
INPUT CH2-
INPUT CH1+
INPUT CH1-
20_E009
PK
25/02/20
2.1
Net labels updated to match silkscreen
INPUT CH1+
INPUT CH1-
20_E038
PK
08/09/20
2.2
None to this sheet
Summary of Contents for HDA PA720
Page 1: ...SERVICE MANUAL POWER AMPLIFIER PA720 ISSUE A ...
Page 2: ...EN 2 Revision History Issue A Initial release ...
Page 14: ...EN 14 EN 14 L281 Power Amplifier PCB Issue 3 ...
Page 36: ...EN 36 EN 36 L282 Pre amp PCB Issue 2 ...
Page 50: ...EN 50 EN 50 L283 PSU PCB Issue 1 ...
Page 54: ...EN 54 L284 Lifter PCB Issue 1 ...
Page 59: ...EN 59 L285 Front Panel PCB Issue 1 ...
Page 62: ...EN 62 Overall Dimensions ...
Page 64: ...EN 64 Exploded Drawings ...