NAD T 975 C/AH, Service Manual, Page: 10 / 40

SEN5
SEN3
SEN1
SEN2
SEN3
SEN7
FAN1 FAN1
SEN6
SEN4
SEN5
PROT3
-70V
FAN1
SEN2
DGND
SCLED
STBY
AGND4
FAN2
SEN5
+18V
+70V
ISCTRIG_6
ISCTRIG_7
ISCTRIG_3
SEN7 AGND4
-18V
ACOFF
AGND6
+8V
SEN3
-62V_3
AGND6
-62V_4
AGND4
FAN3
SEN6
SCLED
ISCTRIG_4
PROT4
+8V
DGND
DGND
PROT7
ISCTRIG_1
PROT2
+62V_4
-62V_4
AGND4
DGND
ISCTRIG_2
ISCTRIG_5
STBY
+62V_4
SEN4
SEN1
FAN2
+62V_3
AGND6
PROT6
PROT5
FAN3 FAN3
PROT1
AGND6
+62V_3
-62V_3
DGND
DGND
OFF1
OFF2
OFF3
OFF1
OFF2
OFF3
+62V_4
-70V
+70V
+18V +18V
STBYLED
+62V_3
-62V_4
+5VD
-18V
+8V
ACOUT
RELAY
ACIN
-62V_3
ACOFF
DGND
ISCTRIG[1..7]
ISCTRIG_5
ISCTRIG_7
ISCTRIG_6
ISCTRIG_2
ISCTRIG_3
ISCTRIG_1
ISCTRIG_4
FAN1
PROT5
PROT3
PROT7
+12VD
PROT4
PROT6
+5VD
PROT1
STBYLED
DGND
SCLED
PROT2
AC CURRENT SENS
DGND
STBY
+70V
ACOFF
-62V_4
-18V
-70V
-62V_3
+18V
+62V_3
+62V_4
+12VD
-12VD
+12VD
+12VD
+12VD
-12VD
+12VD
+12VD
-12VD
+18V
+12VD
+18V
+12VD
+12VD
+12VD
+12VD
+12VD
-12VD
+12VD
-12VD
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
/1%
CONNECT TO AMP MODULE VIA CONNECTION BOARD
/1/2W
/1%
/1%
/1/2W
/1/2W
/1%
/1%
/1KV
FOR Q202
FOR BR205&Q237
FOR IC205 FOR IC202
/1/4W
/1/4W
FOR Q201
FOR BR204&Q236
FOR Q205 FOR Q220
FOR Q206
/35V
/1/2W
/1/2W
/1/2W
/1/2W
FOR Q219
FOR BR206&Q238
/35V
FOR Q239
/100V
FOR Q218
/100V
/100V
/100V
/100V
/100V
/100V
/100V
/100V
/1KV
/100V /100V
/100V
/100V
/100V
/1KV
/100V
/100V
/35V
/35V
/35V
/35V
/25V
/25V
/250V
/250V
/80V
/250V
/80V
/35V
/1/2W
/1/2W
/35V
/100V
/1%
/1%
/1%
/250V /250V
/250V /250V
/80V
/80V
/250V
/250V
/100V
/250V /250V
/250V /250V
/80V
/80V
/100V /100V
/100V
FOR IC201
/1/2W /1/2W /1/2W /1/2W
/1/2W /1/2W /1/2W
/1/2W
/1/2W
/1/2W
CONNECT TO PROTECT AND
SOFTCLIPPING LED BOARD
All Polyester capacitors are 63V unless noted.
All Elec. capacitors are 50V unless noted.
All Resistor are 1/6W RJ13 unless noted.
/1%
/1%
TEST POINT
/1/2W
/1/2W
/1/2W
P209B
5P3.96-C
P209B
5P3.96-C
1
2
4
5
3
R2E5
100K
R2E5
100K
D236
3.3V
D236
3.3V
R259
100
R259
100
R281
10K R281
10K
C274
100nF
C274
100nF
R2F7
10K
R2F7
10K
+
C279
10uF
+
C279
10uF
Q240
2S
C1815
Q240
2S
C1815
Q211
2SA1015
Q211
2SA1015
R2E9
20K
R2E9
20K
+
C264
100uF
+
C264
100uF
R224
10
R224
10
C230
47pF
C230
47pF
R250
470
R250
470
Q225
2SC1815
Q225
2SC1815
R288 10K R288 10K
+
C226
10uF
+
C226
10uF
C243
2.2nF
C243
2.2nF
IC202 LM7912CT IC202 LM7912CT
G
1
O
3
I
2
Q205
2SC4793
Q205
2SC4793
G2G1
Ground Solder Tap
G2G1
Ground Solder Tap
1
R263
10K
R263
10K
Q221
2SC1815
Q221
2SC1815
~
~
+ -
BR206
KBJ2506
~
~
+ -
BR206
KBJ2506
R212
470
R212
470
R2F3
10K
R2F3
10K
+
C278
10uF
+
C278
10uF
R206
100
R206
100
C260
1uF
C260
1uF
Q224
2SC1815
Q224
2SC1815
D212
5.1V
D212
5.1V
D237
13V
D237
13V
R2F4
10K
R2F4
10K
R287 10K R287 10K
C258
10nF
C258
10nF
R223
1.8K
R223
1.8K
Q237 30TPS08 Q237 30TPS08
3
1 2
+
C208
10uF
+
C208
10uF
C229
100nF
C229
100nF
R269
10K
R269
10K
~
~
+ -
BR201
DB104G
~
~
+ -
BR201
DB104G
R246
1K
R246
1K
Q213
2SD667
Q213
2SD667
R233
10K
R233
10K
D201
1N4148
D201
1N4148
P206B
13-22012-00
P206B
13-22012-00
1
2
3
4
5
6
7
8
9
10
11
12
BUS204
COPPER STRIP
BUS204
COPPER STRIP
R291
1K
R291
1K
+
C225
***
1000uF
+
C225
1000uF
+
C213
3300uF
+
C213
3300uF
R264
10K
R264
10K
C281
100nF C281
100nF
R2H4
10K
R2H4
10K
D230
1N4148
D230
1N4148
HS206
70-046006-0
HS206
70-046006-0
Q208
2SC1775
Q208
2SC1775
R244
1K
R244
1K
R297
10K R297
10K
Q204
2SA1015
Q204
2SA1015
D227
1N4148
D227
1N4148
C275
100nF
C275
100nF
R241
10K
R241
10K
C280
100nF
C280
100nF
R273
100
R273
100
C210
10nF
C210
10nF
C212
10nF
C212
10nF
C221
10nF
C221
10nF
+
C217
47uF
+
C217
47uF
R2A1
10
R2A1
10
R2H3
10K
R2H3
10K
+
C238
10uF
+
C238
10uF
BUS202 COPPER STRIP BUS202 COPPER STRIP
Q219
KSC2690AYS
Q219
KSC2690AYS
D206
1N4007
D206
1N4007
F204
T1.6AL/250V
F204
T1.6AL/250V
HS207
70-010002-2
HS207
70-010002-2
R268
10K
R268
10K
P201A
HEADER 8
P201A
HEADER 8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
C259
1uF
C259
1uF
R210
2K
R210
2K
R215
1.8K
R215
1.8K
+
-
IC206A
TL082CP
+
-
IC206A
TL082CP
3
2
1
Q215
2SA1015
Q215
2SA1015
IC204A
SN74HC21N
IC204A
SN74HC21N
13
12
10
9
8
14
7
D214
4.3V
D214
4.3V
R217
220
R217
220
D234
1N4148
D234
1N4148
+
-
IC203A
TL084CN
+
-
IC203A
TL084CN
3
2
1
4
11
R216
1.8K
R216
1.8K
Q212
2SB647
Q212
2SB647
R286 10K R286 10K
Q227
2SD667
Q227
2SD667
CW
RV201
1K
CW
RV201
1K
1
3
2
R272
43K
R272
43K
R225
1.8K
R225
1.8K
D202
1N4148
D202
1N4148
C245
2.2nF
C245
2.2nF
C256
10nF
C256
10nF
R2A8
10K
R2A8
10K
R266
10K
R266
10K
R2A2
10
R2A2
10
R242
10K
R242
10K
C246
2.2nF
C246
2.2nF
P202A
HEADER 8
P202A
HEADER 8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
D213
4.3V
D213
4.3V
Q218
KSC2690AYS
Q218
KSC2690AYS
+
C247
**
15000uF
+
C247
15000uF
R278
3.3K R278
3.3K
D223
1N4148
D223
1N4148
D232
L-513AD
D232
L-513AD
D204
1N4148
D204
1N4148
R285 10K R285 10K
R205
100
R205
100
P207A
6PIN2.54-A100B
P207A
6PIN2.54-A100B
2
3
4
1
5
6
R2A5
10K
R2A5
10K
D205
1N4148
D205
1N4148
Q207
2SC1775
Q207
2SC1775
C201
10nF
C201
10nF
D231
1N4148
D231
1N4148
+
C255
1500uF
+
C255
1500uF
C249
2.2nF
C249
2.2nF
D226
1N4148
D226
1N4148
R279
3.3K R279
3.3K
D208
1N4148
D208
1N4148
D209
1N4148
D209
1N4148
R203
2.2K
R203
2.2K
+
C214
3300uF
+
C214
3300uF
R202
1K
R202
1K
HS213
70-010003-1
HS213
70-010003-1
R2A3
10
R2A3
10
R296
10K
R296
10K
+
C215
100uF
+
C215
100uF
+
C254
**
22000uF
+
C254
22000uF
+
-
IC203D
TL084CN
+
-
IC203D
TL084CN
12
13
14
R284 10K R284 10K
D225
1N4148
D225
1N4148
HS211
70-010003-1
HS211
70-010003-1
D215
4.3V
D215
4.3V
BUS203
COPPER STRIP
BUS203
COPPER STRIP
D221
6.8V
D221
6.8V
R245
1K
R245
1K
R248
1K
R248
1K
+
C284
10uF
+
C284
10uF
+
C218
47uF
+
C218
47uF
C250
2.2nF
C250
2.2nF
P205B
CON16A
P205B
CON16A
1
3
5
7
9
11
13
15 2
4
6
8
10
12
14
16
Q232
2SC1815
Q232
2SC1815
C257
100nF
C257
100nF
R213
10
R213
10
R265
10K
R265
10K
R270
43K
R270
43K
R2A4
10K
R2A4
10K
R2F6
N.I.
R2F6
N.I.
R258
10K
R258
10K
R211
470
R211
470
C271
100nF
C271
100nF
C282
100nF
C282
100nF
D207
1N4148
D207
1N4148
R2E1
1K
R2E1
1K
D210
8.2V
D210
8.2V
R280
10K
R280
10K
Q222
2SC1815
Q222
2SC1815
R298
10K
R298
10K
D219
4.3V
D219
4.3V
+
- IC203C
TL084CN
+
- IC203C
TL084CN
10
9
8
+
C239
10uF
+
C239
10uF
P203B
HEADER 10
P203B
HEADER 10
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
R2F2
20K
R2F2
20K
Q241
2SC1815
Q241
2SC1815
R2A6
10K
R2A6
10K
R252
100K R252
100K
P208B
MOLEX 43160-2105
P208B
MOLEX 43160-2105
1
2
3
4
5
Q242
2SA1015
Q242
2SA1015
+
-
IC206B
TL082CP
+
-
IC206B
TL082CP
5
6
7
8
4
HS212
70-010003-1
HS212
70-010003-1
J204
2PIN2.54-C
J204
2PIN2.54-C
1
2
R292
10K
R292
10K
D220
6.8V
D220
6.8V
R2F8
560
R2F8
560
IC204B
SN74HC21N
IC204B
SN74HC21N
1
2
4
5
6
R222
1.8K
R222
1.8K
C236
100nF
C236
100nF
Q234
2SC1775
Q234
2SC1775
R239
1K
R239
1K
Q226
2SC1815
Q226
2SC1815
+
C231
10uF
+
C231
10uF
P204B
CON16A
P204B
CON16A
1
3
5
7
9
11
13
15 2
4
6
8
10
12
14
16
+
C216
100uF
+
C216
100uF
R260
2K
R260
2K
R295
10K
R295
10K
J201
2PIN2.54-C
J201
2PIN2.54-C
1 2
R2A9
10K
R2A9
10K
+
C209
10uF
+
C209
10uF
Q231
2SC1815
Q231
2SC1815
R2F1
10K
R2F1
10K
+
C233
100uF
+
C233
100uF
J203
2PIN2.54-C
J203
2PIN2.54-C
Pin 1 GND
Pin
2
TP1
C237
100nF
C237
100nF
+
C253
**
22000uF
+
C253
22000uF
HS202
70-046006-0
HS202
70-046006-0
R237
1K
R237
1K
C207
100nF
C207
100nF
R257
1K
R257
1K
HS203
70-046006-0
HS203
70-046006-0
R261
10K
R261
10K
R2H2
10K
R2H2
10K
R254
470
R254
470
R240
47
R240
47
+
C235
10uF
+
C235
10uF
+
C227
47uF
+
C227
47uF
D224
1N4148
D224
1N4148
R294
10K R294
10K
Q202
KSC2690AYS
Q202
KSC2690AYS
R293
10K
R293
10K
HS201
70-046006-0
HS201
70-046006-0
R235
1K
R235
1K ~
~
+ -
BR205
KBJ2506
~
~
+ -
BR205
KBJ2506
R276
3.3K R276
3.3K
R228
15K
R228
15K
R243
10K
R243
10K
R283
10K
R283
10K
+
C202
3300uF
+
C202
3300uF
Q217
2SD667
Q217
2SD667
+
C232
47uF
+
C232
47uF
BUS205
COPPER STRIP
BUS205
COPPER STRIP
R229
4.7K
R229
4.7K
R234
10K
R234
10K
Q229
2SC1815
Q229
2SC1815
D218
4.3V
D218
4.3V
R256
10K
R256
10K
Q223
2SC1815
Q223
2SC1815
D233
1N4148
D233
1N4148
R220
10.2K
R220
10.2K
R274
100
R274
100
HS204
70-046006-0
HS204
70-046006-0
C222
10nF
C222
10nF
R226
220
R226
220
R2F5
0
R2F5
0
F203
T1.6AL/250V
F203
T1.6AL/250V
R209
10K
R209
10K
Q238 30TPS08 Q238 30TPS08
3
1 2
+
C228
100uF
+
C228
100uF
HS210
70-010002-2
HS210
70-010002-2
R271
43K
R271
43K
~
~
+ -
BR202
DB104G ~
~
+ -
BR202
DB104G
Q214
2SC1815
Q214
2SC1815
R208
1.5K R208
1.5K
BUS201 COPPER STRIP BUS201 COPPER STRIP
R2E6
1K
R2E6
1K
C244
2.2nF
C244
2.2nF
IC205
LM7805CT
IC205
LM7805CT
O
3
I
1
G
2
C223
10nF
C223
10nF
C242
10nF
C242
10nF
R267
10K
R267
10K
R221
2.1K
R221
2.1K
R282
10K
R282
10K
+
C224
***
1000uF
+
C224
1000uF
R255
1K
R255
1K
C273
100nF
C273
100nF
+
C248
**
15000uF
+
C248
15000uF
Q220
KSC2690AYS
Q220
KSC2690AYS
R2A7
10K
R2A7
10K
Q210
2SC1815
Q210
2SC1815
R227
12K
R227
12K
D217
4.3V
D217
4.3V
D229
1N4148
D229
1N4148
R207
1.5K R207
1.5K
Q233
2SC1815
Q233
2SC1815
F201
T1.6AL/250V
F201
T1.6AL/250V
C241
10nF
C241
10nF
C252
2.2nF
C252
2.2nF
D222
6.8V
D222
6.8V
~
~
+ -
BR203
DB104G
~
~
+ -
BR203
DB104G
+
C283
10uF
+
C283
10uF
HS209
70-010002-2
HS209
70-010002-2
C206
100nF C206
100nF
R201
1K
R201
1K
Q228
2SC1815
Q228
2SC1815
Q230
2SC1815
Q230
2SC1815
C204
10nF
C204
10nF
D216
4.3V
D216
4.3V
R253
1K
R253
1K
F202
T1.6AL/250V
F202
T1.6AL/250V
R236
1K
R236
1K
R2E4
1K
R2E4
1K
D203
1N4148
D203
1N4148
D235
3.3V
D235
3.3V
Q216
2SB647
Q216
2SB647
~
~
+ -
BR204
KBJ2506
~
~
+ -
BR204
KBJ2506
D211
8.2V
D211
8.2V
R262
10K
R262
10K
C211
10nF
C211
10nF
C220
10nF
C220
10nF
~
~
+ -
BR208
DB104G
~
~
+ -
BR208
DB104G
C251
2.2nF
C251
2.2nF
+
C276
10uF
+
C276
10uF
Q206
2SA1837
Q206
2SA1837
Q203
2SC1815
Q203
2SC1815
HS214
70-046006-0
HS214
70-046006-0
R2E3
180
R2E3
180
Q236 30TPS08 Q236 30TPS08
3
1 2
R247
47
R247
47
R230
1K
R230
1K
R2E7
1K
R2E7
1K
R290 10K R290 10K
Q201
KSA1220AYS
Q201
KSA1220AYS
BUS206 COPPER STRIP BUS206 COPPER STRIP
+
C203
3300uF
+
C203
3300uF
R2E8
10K
R2E8
10K
R249
47
R249
47
R251
1K
R251
1K
Q239 30TPS08 Q239 30TPS08
3
1 2
+
C277
10uF
+
C277
10uF
R2E2
10K
R2E2
10K
+
- IC203B
TL084CN
+
- IC203B
TL084CN
5
6
7
R299
100
R299
100
R218
2.2K R218
2.2K
J202
2PIN2.54-C
J202
2PIN2.54-C
1 2
Q209
2SA872
Q209
2SA872
C205
10nF
C205
10nF
C234
47pF
C234
47pF
IC201 LM7812CT IC201 LM7812CT
O
3
I
1
G
2
R204
2.2K
R204
2.2K
R277
3.3K R277
3.3K
R214
1.8K R214
1.8K
R219
220
R219
220
R289 10K R289 10K
+
C240
10uF
+
C240
10uF
HS208
70-010002-2
HS208
70-010002-2
Q235
2SA872
Q235
2SA872
R238
47
R238
47
HS205
70-046006-0
HS205
70-046006-0
~
~
+ -
BR207
~
~
+ -
BR207
R231
10K
R231
10K
C272
100nF
C272
100nF
R275
100
R275
100
C261
1uF
C261
1uF
C219
10nF
C219
10nF
R232
10K
R232
10K
C262
220pF
C262
220pF
D228
1N4148
D228
1N4148
- 10 -
SCHEMATICS DIAGRAM
** For countries with higher than expected mains voltage, one may change C247 and C248 from
CD294 15000uF 80V 105°C four pins 35x100 (P/N 06-15381-01) to CD294 10000uF 100V 105°C ±20%
four pins 35x100 (P/N 06-10312-02), and change C253 and C254 from CD294 22000uF 80V 105°C four
pins 35x100 (P/N 06-22381-00) to CD294 10000uF 100V 105°C ±20% four pins 35x100 (P/N 06-10312-02).
*** One may use 06-10212-01 1000uF 100V 105°C for C224 and C225 instead of 06-10281-01 @ 80V.
TO AND FROM
THERMAL BREAKERS