NAD T-973 Service manual
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T 973
Seven Channel Amplifier
PRELIMINARY SCHEMATICS
ISSUE DATE: May 2004
T 973 WIRING DIAGRAM
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Pr
Pr
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MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN
MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN
SCHEMATIC DIAGRAM(AMP CONNECTION)
FAN1
DGND
FAN2
DGND
15
16
STBY
15
16
STBY
SEN2
SEN3
SEN1
SEN7
P604B
P611B
P611B
COPPER STRIP
11223344556677889
9
AGND4A
+62V_4A
-62V_4A
-62V_4A
AGND4B
-62V_4B
-62V_4B
AGND4
-62V_4
-62V_4
+62V_4A
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
11223344556677889
+62V_4B
+62V_4B
11223344556677889
+62V_4
+62V_4
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
11223344556677889
ISCTRIG_1 ISCTRIG_3 ISCTRIG_5 ISCTRIG_6 ISCTRIG_7
AGND4A
AGND4A
P621B
HEADER 2
P621B
1
2
1
2
HEADER 2
P622
HEADER 2
P622
HEADER 2
1
2
1
2
9
AGND4B
ISCTRIG_2
AGND4B
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
P613B
P613B
9
AGND4
AGND4
9
P612B
P612B
P614B
P614B
+62V_4A
+62V_4B
+62V_4
-62V_4A
-62V_4B
-62V_4
AGND4A
AGND4B
AGND4
COPPER STRIP
BUS601
BUS601
COPPER STRIP
COPPER STRIP
BUS602
BUS602
COPPER STRIP
COPPER STRIP
BUS603
BUS603
P604B
11223344556677889
9
MOLEX 2145/3215 TOP ENTRY/9PIN
-68V
ACOFF
+68V
PROT1
SEN1
9
-68V
ACOFF
+68V
PROT2
SEN2
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
P606B
P606B
9
-68V
ACOFF
+68V
PROT3
SEN3
9
MOLEX 2145/3215 TOP ENTRY/9PIN
SCN_4
+18V
-18V
SCP_4
P605B
P605B
11223344556677889
SCN_4
+18V
-18V
SCP_4
11223344556677889
SCN_4
+18V
-18V
SCP_4
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
P607B
P607B
11223344556677889
PROT3
+8V
PROT4
+8V
SEN5
SEN4
101214
AGND
SEN6
101214
8
DGND
SCLED
PROT1
PROT2
AGND
135791113
P601B
P601B
246
8
PROT6
DGND
SCLED
PROT7
PROT5
MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN
MOLEX 52207 RIGHT ANGLE/SMT/ZIF/TOP CONTACT STYLE/16PIN
ISCTRIG_6
ISCTRIG_2
DGND
ISCTRIG_4
135791113
P602B
P602B
246
ISCTRIG_7
ISCTRIG_5
ISCTRIG_3
ISCTRIG_1
FAN3
DGND
1
2
P623
HEADER 2
P623
HEADER 2
1
2
AGND4
ISCTRIG_4
MOLEX 5145-NCH TOP ENTRY/8PIN
MOLEX 5145-NCH TOP ENTRY/8PIN
P619B
P619B
8
AGND4
AGND4
8
AGND6
AGND6
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
AGND4
AGND4
AGND4
AGND6
AGND6
+62V_4
112233445566778
-62V_4
+62V_4
+62V_4
-62V_4
MOLEX 5145-NCH TOP ENTRY/8PIN
MOLEX 5145-NCH TOP ENTRY/8PIN
P620B
P620B
112233445566778
+62V_3
-62V_3
+62V_3
-62V_3
+62V_4
-62V_4
-62V_4
AGND4
P615B
P615B
11223344556677889
9
+62V_3
-62V_3
-62V_3
AGND6
AGND6
9
AGND6A
AGND6A
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
AGND6
AGND6A
-62V_3A
-62V_3A
+62V_3
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
P616B
P616B
11223344556677889
+62V_3A
+62V_3A
+62V_3
+62V_3A
+62V_3B
-62V_3
-62V_3A
-62V_3B
ACOFF
SEN4
MOLEX 51021/12PIN/500mm WIRE
MOLEX 51021/12PIN/500mm WIRE
101112
SCP_4
+62V_3
-62V_3
-62V_4
+62V_4
COPPER STRIP
COPPER STRIP
BUS604
BUS604
9
ACOFF
SEN5
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
P609B
P609B
COPPER STRIP
COPPER STRIP
BUS605
BUS605
9
ACOFF
SEN6
-68V
PROT4
SCN_4
SCP_3
-68V
PROT5
-18V
+68V
SCLED
SCN_3
-18V
+68V
SCN_4
+18V
SCP_4
S10B-PH-SM3-TB
S10B-PH-SM3-TB
P603B
P603B
10
10
9
P618B
P618B
123456789
+8V
DGND
STBY
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
11223344556677889
SCN_3
+18V
SCP_3
11223344556677889
P608B
P608B
AGND
FAN1
FAN2
FAN3
-68V
+68V
ACOFF
+18V
-18V
11223344556677889
-68V
PROT6
-18V
+68V
SCN_3
+18V
SCP_3
MOLEX 2145/3215 TOP ENTRY/9PIN
MOLEX 2145/3215 TOP ENTRY/9PIN
DGND
P617B
P617B
9
AGND6B
AGND6B
-62V_3B
AGND6B
11223344556677889
+62V_3B
-62V_3B
+62V_3B
AGND6
AGND6A
AGND6B
COPPER STRIP
COPPER STRIP
BUS606
BUS606
9
ACOFF
SEN7
-68V
PROT7
-18V
+68V
+18V
SCP_3
11223344556677889
SCN_3
P610B
P610B
SCHEMATIC DIAGRAM (AMP POWER SUPPLY)
F201
F201
T1AL/250V
P209B
P209B
5P3.96-C
5P3.96-C
P208B
P208B
1
2
3
4
5
5P7.5-C
5P7.5-C
15K
15K
4.7K
4.7K
SEN1
SEN2
SEN3
SEN3
SEN4
SEN5
SEN5
SEN6
SEN7
ISCTRIG[1..7]
R228
R228
R229
R229
1
2
3
4
5
/1/4W
1
2
3
4
5
D206
D206
1N4007
1N4007
/1/4W
R261
R261
10K
10K
R262
R262
10K
10K
R263
R263
10K
10K
R264
R264
10K
10K
R265
R265
10K
10K
R266
R266
10K
10K
R267
R267
10K
10K
R268
R268
10K
10K
R269
R269
10K
10K
T1AL/250V
F203
F203
T1.25AL/250V
T1.25AL/250V
1
2
3
4
5
F204
F204
T1.25AL/250V
T1.25AL/250V
F202
F202
T1AL/250V
T1AL/250V
KBJ2506
KBJ2506
/250V
C241
C241
10n
10n
+18V +18V
R256
R2551KR255
R270
R270
43K
43K
R271
R271
43K
43K
R272
R272
43K
43K
R256
10K
10K
Q230
Q230
2SC1815
2SC1815
1K
C271
C271
/100V
100n
100n
R273
R273
1
100
100
C272
C272
/100V
100n
100n
-12VD
/1%
/100V
R274
R274
7
100
100
/1%
/100V
R275
R275
8
100
100
/1%
/100V
R231
R231
10K
10K
R2301KR230
Q229
Q229
2SC1815
2SC1815
1K
+
+
C240
C240
/100V
10u
10u
411
IC203A
IC203A
TL084
TL084
3
+
+
2
-
-
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
C273 100nC273 100n
IC203B
IC203B
TL084
TL084
5
+
+
6
-
-
C274 100nC274 100n
IC203C
IC203C
TL084
TL084
10
+
+
9
-
-
C275 100nC275 100n
BR204
BR204
R2571KR257
1K
/100V
C201
C201
10n
10n
/100V
C210
C210
10n
10n
~
~
+-
+-
~
~
+12VD
Q218
Q218
KSC2690AYS
KSC2690AYS
D207
D207
+12VD
Q219
Q219
KSC2690AYS
KSC2690AYS
D208
D208
+12VD
Q220
Q220
KSC2690AYS
KSC2690AYS
D209
D209
BR201
BR201
DB104
DB104
BR202
BR202
DB104
DB104
1N4148
1N4148
1N4148
1N4148
1N4148
1N4148
BR205
BR205
KBJ2506
KBJ2506
C276
C276
C277
C277
C278
C278
FAN1
FAN2
FAN3
~
~
~
~
~
~
~
~
/100V
100n
100n
/100V/100V
100n
100n
100n
100n
+-
+-
+
+
C202
C202
/50V
470u
470u
+
+
C203
C203
/50V
470u
470u
C211
C211
+-
+-
C212
C212
~
~
+-
+-
C242
C242
~
~
+12VD
R276
R276
3.3K
3.3K
D210
D210
N.I.
N.I.
R277
R277
3.3K
3.3K
+12VD
R278
R278
3.3K
3.3K
D211
D211
N.I.
N.I.
R279
R279
3.3K
3.3K
1
IC201 LM7812IC201 LM7812
C204
C204
/100V
10n
10n
C205
C205
/100V
10n
10n
2
IC202
IC202
KSA1220AYS
KSA1220AYS
R2011KR201
1K
R203
R203
/100V/100V
2.2K
2.2K
10n
10n
+
+
C213
C213
3900u
3900u
+
+
C214
C214
3900u
3900u
R204
R204
2.2K
2.2K
10n
10n
R2021KR202
1K
BR206
BR206
KBJ2506
KBJ2506
~
~
/250V
10n
10n
~
~
R280
R280
10K
10K
R282
R282
N.I.
N.I.
R281
R281
10K
10K
R283
R283
N.I.
N.I.
12
+
+
13
-
-
IC203D
IC203D
TL084
TL084
O3I
G
2
1
G
O3I
Q201
Q201
2SC1815
2SC1815
/25V
/25V
2SA1015
2SA1015
Q202
Q202
KSC2690AYS
KSC2690AYS
+-
+-
14
LM7912
LM7912
Q203
Q203
Q204
Q204
Q221
Q221
N.I.
N.I.
Q222
Q222
N.I.
N.I.
+
+
+
+
R205
R205
100
100
100u
100u
100u
100u
R206
R206
+12VD
+
+
C208
C208
C206
C206
/50V/100V
100n
100n
10u
10u
+
+
C209
C209
C207
C207
/50V
/100V
10u
10u
100n
100n
C215
C215
/25V
C216
C216
/25V
100
100
R232
R232
10K
10K
-12VD
R207
R207
1.5K
1.5K
+
+
C217
C217
/25V
47u
47u
+
+
C218
C218
/25V
47u
47u
R208
R208
1.5K
1.5K
R233
R233
/1/2W
10K
10K
Q210
Q210
2SC1815
2SC1815
Q211
Q211
2SA1015
2SA1015
R234
R234
10K
10K
R2361KR236
/1/2W
10n
10n
10n
10n
2SB647
2SB647
1K
C219
C219
C220
C220
Q212
Q212
/100V
/100V
C221
C221
10n
10n
BR203
BR203
DB104
DB104
R23847R238
47
R2351KR235
1K
QT01 30TPS08QT01 30TPS08
C243
C243
/250V /250V
2.2n
2.2n
C244
C244
/250V /250V
2.2n
2.2n
1 2
QT02 30TPS08QT02 30TPS08
R2371KR237
1K
/250V
3
2SD667
2SD667
2.2n
2.2n
2.2n
2.2n
Q213
Q213
C245
C245
C246
C246
3
12
C222
C222
~
~
+-
+-
~
~
C223
C223
R2391KR239
1K
R24047R240
47
/250V
10n
10n
/250V
10n
10n
+
+
15000u
15000u
+
+
15000u
15000u
C247
C247
C248
C248
C224
C224
C225
C225
+
+
+
+
/80V
/80V
+12VD
/80V
1000u
1000u
/80V
1000u
1000u
FOR BR204&QT01
FOR BR205&QT02
1N4148
1N4148
R211
R211
470
470
HS207
HS207
70-010002-0
70-010002-0
HS208
HS208
70-010002-0
70-010002-0
D201
D201
R212
R212
100
100
+
+
/50V
C227
C227
C226
C226
10u
10u
R2221KR222
1K
+
+
R2141KR214
R2151KR215
1K
10
1K
Q205
Q205
R21310R213
KSC2690AYS
KSC2690AYS
/1/2W FP
C228
C228
+
+
/25V
100u
100u
R2161KR216
1K
R217
R217
220
220
D202
D202
1N4148
1N4148
/100V
C229
C229
/100V
100n
100n
47u
47u
+
+
C232
C232
/100V
47u
47u
R2251KR225
R2231KR223
1K
C233
C233
+
+
/100V
10u
10u
R22410R224
/1/2W FP
10
m
Q207
Q207
2SC1775
2SC1775
Q209
Q209
2SA872
2SA872
1K
R241
R241
10K
10K
47p
47p
Q208
Q208
2SC1775
2SC1775
R218
R218
1.2K
1.2K
C234
C234
47P
47P
Q206
Q206
KSA1220AYS
KSA1220AYS
C231
C231
10u
10u
C230
C230
/1KV
R219
R219
220
220
D203
D203
1N4148
1N4148
D204
D204
1N4148
1N4148
R226
R226
220
220
/1KV
Q216
Q216
2SB647
2SB647
R242
R242
/1/2W
10K
10K
Q214
Q214
2SC1815
2SC1815
n
i
R2451KR245
1K
Q215
Q215
2SA1015
2SA1015
R243
R243
/1/2W
10K
10K
+
+
/100V
+
+
C235
C235
/100V
10u
10u
R24747R247
47
R2441KR244
a
1K
QT03 30TPS08QT03 30TPS08
C249
C249
/250V /250V
2.2n
2.2n
C250
C250
/250V /250V
2.2n
2.2n
1 2
QT04 30TPS08QT04 30TPS08
R2461KR246
3
1K
2SD667
2SD667
R220
R220
10K
10K
R2212KR221
2K
D205
D205
1N4148
1N4148
R227
R227
12K
12K
r
3
12
C251
C251
2.2n
2.2n
C252
C252
2.2n
2.2n
Q217
Q217
/1%
C236
C236
/1%
C237
C237
/1%
y
R2481KR248
HS201
HS201
70-010003-0
70-010003-0
+
+
C238
C238
/100V
/100V
10u
10u
100n
100n
+
+
C239
C239
/100V
/100V
10u
10u
100n
100n
1K
+
+
C253
C253
22000u
22000u
+
+
C254
C254
22000u
22000u
R24947R249
47
/80V
/80V
FOR IC201
HS202
HS202
70-010003-0
70-010003-0
FOR IC202
HS209
HS209
70-010002-0
70-010002-0
FOR BR206&QT03
HS210
HS210
70-010002-0
70-010002-0
FOR QT04
BUS206 COPPER STRIPBUS206 COPPER STRIP
BUS201 COPPER STRIPBUS201 COPPER STRIP
BUS202 COPPER STRIPBUS202 COPPER STRIP
HS203
HS203
70-010003-0
70-010003-0
FOR Q201
HS204
HS204
70-010003-0
70-010003-0
FOR Q202
BR207
BR207
DB104
DB104
~
~
+-
+-
~
~
C255
C255
1500u
1500u
HS205
HS205
70-010003-0
70-010003-0
FOR Q205
HS206
HS206
70-010003-0
70-010003-0
FOR Q206
IC205
IC205
LM7805
LM7805
1
O3I
G
C256
C256
2
/100V /100V
10n
10n
Q228
+
+
/50V
Q227
Q227
2SD667
2SD667
Q228
2SC1815
2SC1815
C258
C258
100n
100n
/100V
10n
10n
C257
C257
HS211
HS211
70-010003-0
70-010003-0
FOR Q218
HS212
HS212
70-010003-0
70-010003-0
FOR Q219
R2511KR251
R2531KR253
R252
R252
100K
100K
1K
1K
i
ISCTRIG_5
ISCTRIG_7
ISCTRIG_6
ISCTRIG_4
ISCTRIG_2
ISCTRIG_3
ISCTRIG_1
+12VD
R284 10KR284 10K
R285 10KR285 10K
R286 10KR286 10K
R287 10KR287 10K
R288 10KR288 10K
R289 10KR289 10K
R290 10KR290 10K
R2911KR291
1K
R292
R292
10K
10K
13
12
10
9
D215
D213
D213
/1/2W /1/2W /1/2W
4.3V
4.3V
D216
D216
/1/2W /1/2W /1/2W /1/2W
4.3V
4.3V
D215
D214
D214
4.3V
4.3V
4.3V
4.3V
D217
D217
D218
D218
4.3V
4.3V
4.3V
4.3V
147
8
IC204A
IC204A
SN74HC21N
SN74HC21N
P
1
2
4
5
D219
D219
4.3V
4.3V
e
D212
D212
/1/2W
5.1V
5.1V
r
R293
R293
10K
10K
IC204B
IC204B
SN74HC21N
SN74HC21N
l
+12VD
+
+
C279
C279
R294
R294
/50V
10u
10u
10K
10K
R295
R295
Q223
Q223
2SC1815
2SC1815
R296
R296
6
10K
10K
Q224
Q224
2SC1815
2SC1815
10K
10K
+12VD
R297
R297
10K
10K
R298
R298
Q226
Q226
2SC1815
2SC1815
10K
10K
Q225
Q225
2SC1815
2SC1815
P201A
P201A
1
2
3
4
5
6
7
8
HEADER 8
HEADER 8
P202A
P202A
1
2
3
4
5
6
7
8
HEADER 8
HEADER 8
P203B
P203B
1
2
3
4
5
6
7
8
9
10
HEADER 10
HEADER 10
AGND6
1
AGND6
2
AGND6
3
AGND6
4
-62V_3
5
-62V_3
6
+62V_3
7
+62V_3
8
AGND4
1
AGND4
2
AGND4
3
AGND4
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10
-62V_4
-62V_4
+62V_4
+62V_4
DGND
FAN1
FAN2
FAN3
-68V
+68V
ACOFF
+18V
-18V
DGND
ISCTRIG_1
ISCTRIG_3
ISCTRIG_5
ISCTRIG_7
SEN1
SEN7
SEN6
STBY
+8V
PROT4
PROT5
PROT6
PROT7
DGND
SCLED
BUS203
BUS203
COPPER STRIP
COPPER STRIP
P204B
P204B
1
3
5
7
9
11
13
15
CON16A
CON16A
P205B
P205B
1
3
5
7
9
11
13
15
CON16A
CON16A
BUS204
BUS204
COPPER STRIP
COPPER STRIP
STBY
2
+8V
4
PROT3
6
PROT2
8
PROT1
10
DGND
12
SCLED
14
DGND
16
SEN2
2
SEN3
4
SEN4
6
SEN5
8
ISCTRIG_2
10
ISCTRIG_4
12
ISCTRIG_6
14
DGND
16
P206B
P206B
10
11
12
12P2.54-C
12P2.54-C
CONNECT TO PROTECT AND
SOFTCLIPPING LED BOARD
+12VD
1
PROT1
2
PROT2
3
PROT3
4
PROT4
5
PROT5
6
PROT6
7
PROT7
8
SCLED
9
DGND
+5VD
STBYLED
70-010003-0
70-010003-0
FOR Q220
70-010003-0
70-010003-0
FOR IC205
R254
R254
470
470
BUS205
BUS205
COPPER STRIP
COPPER STRIP
HS213
HS213
HS214
HS214
ACIN
ACOUT
+5VD
RELAY
STBYLED
+18V
+68V
-68V
-18V
+62V_4
+62V_3
+8V
STBY
DGND
-62V_3
-62V_4
ACOFF
P207B
P207B
1
2
3
4
4P2.54-C
4P2.54-C
+18V
+68V
-68V
-18V
+62V_4
+62V_3
-62V_3
-62V_4
ACOFF
CONNECT TO AMP MODULE VIA CONNECTION BOARD
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