NAD T977 C/AH Service Manual - page 10
SEN5
SEN3
SEN1
SEN2
SEN3
SEN7
FAN1
FAN1
SEN6
SEN4
SEN5
PROT3
-70V
FAN1
SEN2
DGND
THERMAL
STBY
AGND4
FAN2
SEN5
+18V
+70V
ISCTRIG_6
ISCTRIG_7
ISCTRIG_3
SEN7
AGND4
-18V
ACOFF
AGND
AGND6
+5VD
SEN3
-62V_3
AGND6
-62V_4
AGND4
FAN3
SEN6
SCLED
ISCTRIG_4
PROT4
+5VD
DGND
DGND
PROT7
ISCTRIG_1
PROT2
+62V_4
-62V_4
AGND4
DGND
ISCTRIG_2
ISCTRIG_5
STBYLED
+62V_4
SEN4
SEN1
FAN2
+62V_3
AGND6
PROT6
PROT5
FAN3
FAN3
PROT1
AGND6
+62V_3
-62V_3
POWER
DGND
OFF1
OFF2
OFF3
OFF1
OFF2
OFF3
+62V_4
-70V
+70V
+18V
+18V
+62V_3
-62V_4
+5VD
-18V
RELAY
-62V_3
ACOFF
ISCTRIG[1..7]
ISCTRIG_5
ISCTRIG_7
ISCTRIG_6
ISCTRIG_2
ISCTRIG_3
ISCTRIG_1
ISCTRIG_4
FAN1
AC CURRENT SENS
DGND
STBY
THERMAL
PROT4
PROT6
PROT1
PROT3
PROT2
POWER
+5VD
PROT7
+5VD
SCLED
+12VD
+12VD
DGND
DGND
STBYLED
PROT5
+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
+5VD
/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 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
/100V
/250V
/100V
/35V
/1/2W
/1/2W
/35V
/100V
/1%
/1%
/1%
/250V
/250V
/250V
/250V
/100V
/100V
/250V
/250V
/100V
/250V
/250V
/250V
/250V
/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 DISPLAY 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
CONNECT TO
STANDBY BOARD
CONNECT TO
THERMAL BOARD
R212
470
R212
470
~
~
+
-
BR206
KBJ2506
~
~
+
-
BR206
KBJ2506
Q221
2SC1815
Q221
2SC1815
R263
10K
R263
10K
G2G1
Ground Solder Tap
G2G1
Ground Solder Tap
1
Q205
2SC4793
Q205
2SC4793
IC202
LM7912CT
IC202
LM7912CT
G
1
O
3
I
2
C243
2.2nF
C243
2.2nF
+
C226
10uF
+
C226
10uF
R288
10K
R288
10K
R250
470
R250
470
Q225
2SC1815
Q225
2SC1815
C230
47pF
C230
47pF
R224
10
R224
10
+
C264
100uF
+
C264
100uF
R2E9
20K
R2E9
20K
Q211
2SA1015
Q211
2SA1015
Q240
2SC1815
Q240
2SC1815
+
C279
10uF
+
C279
10uF
R2F7
10K
R2F7
10K
C274
100nF
C274
100nF
R281
10K
R281
10K
R259
100
R259
100
D236
3.3V
D236
3.3V
R2E5
100K
R2E5
100K
P209B
5P3.96-C
P209B
5P3.96-C
1
2
4
5
3
+
C208
10uF
+
C208
10uF
Q237
30TPS08
Q237
30TPS08
3
1
2
R223
1.8K
R223
1.8K
R287
10K
R287
10K
R2F4
10K
R2F4
10K
D237
13V
D237
13V
D212
5.1V
D212
5.1V
Q224
2SC1815
Q224
2SC1815
C260
1uF
C260
1uF
R206
100
R206
100
+
C278
10uF
+
C278
10uF
R2F3
10K
R2F3
10K
R244
1K
R244
1K
Q208
2N5551
Q208
2N5551
HS206
70-046006-0
HS206
70-046006-0
D230
1N4148
D230
1N4148
R2H4
10K
R2H4
10K
R264
10K
R264
10K
C281
100nF
C281
100nF
+
C213
3300uF
+
C213
3300uF
+
C225
1000uF
+
C225
1000uF
R291
1K
R291
1K
BUS204
COPPER STRIP
BUS204
COPPER STRIP
D201
1N4148
D201
1N4148
R233
10K
R233
10K
Q213
2SD667
Q213
2SD667
R246
1K
R246
1K
~
~
+
-
BR201
DB104G
~
~
+
-
BR201
DB104G
R269
10K
R269
10K
C229
100nF
C229
100nF
C259
1uF
C259
1uF
R210
2K
R210
2K
P207A
4PIN2.54-A100B
P207A
4PIN2.54-A100B
2
3
4
1
P201A
HEADER 8
P201A
HEADER 8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
R268
10K
R268
10K
HS207
70-010002-2
HS207
70-010002-2
F204
T1.6AL/250V
F204
T1.6AL/250V
D206
1N4007
D206
1N4007
Q219
KSC2690AYS
Q219
KSC2690AYS
BUS202
COPPER STRIP
BUS202
COPPER STRIP
+
C238
10uF
+
C238
10uF
R2H3
10K
R2H3
10K
R2A1
10
R2A1
10
+
C217
47uF
+
C217
47uF
C221
10nF
C221
10nF
C212
10nF
C212
10nF
C210
10nF
C210
10nF
R273
100
R273
100
C280
100nF
C280
100nF
R241
10K
R241
10K
C275
100nF
C275
100nF
D227
1N4148
D227
1N4148
Q204
2SA1015
Q204
2SA1015
R297
10K
R297
10K
C245
2.2nF
C245
2.2nF
D202
1N4148
D202
1N4148
R225
1.8K
R225
1.8K
R272
43K
R272
43K
CW
RV201
1K
CW
RV201
1K
1
3
2
Q227
2SD667
Q227
2SD667
R286
10K
R286
10K
Q212
2SB647
Q212
2SB647
+
-
IC203A
TL084CN
+
-
IC203A
TL084CN
3
2
1
4
11
R216
1.8K
R216
1.8K
D234
1N4148
D234
1N4148
R217
220
R217
220
D214
4.3V
D214
4.3V
IC204A
SN74HC21N
IC204A
SN74HC21N
13
12
10
9
8
14
7
Q215
2SA1015
Q215
2SA1015
+
-
IC206A
TL082CP
+
-
IC206A
TL082CP
3
2
1
R215
1.8K
R215
1.8K
R2A5
10K
R2A5
10K
R205
100
R205
100
R285
10K
R285
10K
D204
1N4148
D204
1N4148
D232
L-513AD
D232
L-513AD
D223
1N4148
D223
1N4148
R278
3.3K
R278
3.3K
+
C247
10000uF
+
C247
10000uF
Q218
KSC2690AYS
Q218
KSC2690AYS
D213
4.3V
D213
4.3V
P202A
HEADER 8
P202A
HEADER 8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
C246
2.2nF
C246
2.2nF
R242
10K
R242
10K
R2A2
10
R2A2
10
R266
10K
R266
10K
R2A8
10K
R2A8
10K
HS211
70-010003-1
HS211
70-010003-1
D225
1N4148
D225
1N4148
+
-
IC203D
TL084CN
+
-
IC203D
TL084CN
12
13
14
R284
10K
R284
10K
+
C254
15000uF
+
C215
100uF
+
C215
100uF
R296
10K
R296
10K
R2A3
10
R2A3
10
HS213
70-010003-1
HS213
70-010003-1
R202
1K
R202
1K
+
C214
3300uF
+
C214
3300uF
R203
2.2K
R203
2.2K
D209
1N4148
D209
1N4148
D208
1N4148
D208
1N4148
R279
3.3K
R279
3.3K
D226
1N4148
D226
1N4148
C249
2.2nF
C249
2.2nF
C201
10nF
C201
10nF
D231
1N4148
D231
1N4148
Q207
2N5551
Q207
2N5551
D205
1N4148
D205
1N4148
R280
10K
R280
10K
D210
8.2V
D210
8.2V
R2E1
1K
R2E1
1K
D207
1N4148
D207
1N4148
C282
100nF
C282
100nF
C271
100nF
C271
100nF
R211
470
R211
470
R258
10K
R258
10K
R2F6
N.I.
R2F6
N.I.
R2A4
10K
R2A4
10K
R270
43K
R270
43K
R265
10K
R265
10K
R213
10
R213
10
Q232
2SC1815
Q232
2SC1815
P205B
CON16A
P205B
CON16A
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
C250
2.2nF
C250
2.2nF
+
C218
47uF
+
C218
47uF
+
C284
10uF
+
C284
10uF
R248
1K
R248
1K
R245
1K
R245
1K
D221
6.8V
D221
6.8V
D215
4.3V
D215
4.3V
BUS203
COPPER STRIP
BUS203
COPPER STRIP
R2F8
560
R2F8
560
D220
6.8V
D220
6.8V
R292
10K
R292
10K
J204
2PIN2.54-C
J204
2PIN2.54-C
1
2
HS212
70-010003-1
HS212
70-010003-1
+
-
IC206B
TL082CP
+
-
IC206B
TL082CP
5
6
7
8
4
Q242
2SA1015
Q242
2SA1015
P208B
MOLEX 43160-2105
P208B
MOLEX 43160-2105
1
2
3
4
5
R252
100K
R252
100K
R2A6
10K
R2A6
10K
R2F2
20K
R2F2
20K
Q241
2SC1815
Q241
2SC1815
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
+
C239
10uF
+
C239
10uF
+
-
IC203C
TL084CN
+
-
IC203C
TL084CN
10
9
8
D219
4.3V
D219
4.3V
R298
10K
R298
10K
Q222
2SC1815
Q222
2SC1815
Q231
2SC1815
Q231
2SC1815
+
C209
10uF
+
C209
10uF
R2A9
10K
R2A9
10K
J201
2PIN2.54-C
J201
2PIN2.54-C
1
2
R295
10K
R295
10K
R260
2K
R260
2K
+
C216
100uF
+
C216
100uF
P204B
CON16A
P204B
CON16A
1
3
5
7
9
11
13
15
2
4
6
8
10
12
14
16
+
C231
10uF
+
C231
10uF
Q226
2SC1815
Q226
2SC1815
R239
1K
R239
1K
Q234
2N5551
Q234
2N5551
C236
100nF
C236
100nF
R222
1.8K
R222
1.8K
IC204B
SN74HC21N
IC204B
SN74HC21N
1
2
4
5
6
~
~
+
-
BR205
KBJ2506
~
~
+
-
BR205
KBJ2506
R235
1K
R235
1K
HS201
70-046006-0
HS201
70-046006-0
Q202
KSC2690AYS
Q202
KSC2690AYS
R293
10K
R293
10K
D224
1N4148
D224
1N4148
R294
10K
R294
10K
+
C227
47uF
+
C227
47uF
+
C235
10uF
+
C235
10uF
R240
47
R240
47
R2H2
10K
R2H2
10K
R261
10K
R261
10K
HS203
70-046006-0
HS203
70-046006-0
R257
1K
R257
1K
C207
100nF
C207
100nF
R237
1K
R237
1K
HS202
70-046006-0
HS202
70-046006-0
+
C253
15000uF
C237
100nF
C237
100nF
J203
2PIN2.54-C
J203
2PIN2.54-C
1
2
+
C233
100uF
+
C233
100uF
R2F1
10K
R2F1
10K
+
C228
100uF
+
C228
100uF
Q238
30TPS08
Q238
30TPS08
3
1
2
F203
T1.6AL/250V
F203
T1.6AL/250V
R209
10K
R209
10K
R2F5
0
R2F5
0
R226
220
R226
220
C222
10nF
C222
10nF
R274
100
R274
100
HS204
70-046006-0
HS204
70-046006-0
R220
10.2K
R220
10.2K
D233
1N4148
D233
1N4148
Q223
2SC1815
Q223
2SC1815
R256
10K
R256
10K
D218
4.3V
D218
4.3V
Q229
2SC1815
Q229
2SC1815
R229
4.7K
R229
4.7K
R234
10K
R234
10K
+
C232
47uF
+
C232
47uF
BUS205
COPPER STRIP
BUS205
COPPER STRIP
Q217
2SD667
Q217
2SD667
+
C202
3300uF
+
C202
3300uF
R283
10K
R283
10K
R243
10K
R243
10K
R228
15K
R228
15K
R276
3.3K
R276
3.3K
D229
1N4148
D229
1N4148
D217
4.3V
D217
4.3V
R227
12K
R227
12K
Q210
2SC1815
Q210
2SC1815
R2A7
10K
R2A7
10K
Q220
KSC2690AYS
Q220
KSC2690AYS
+
C248
10000uF
+
C248
10000uF
C273
100nF
C273
100nF
R255
1K
R255
1K
+
C224
1000uF
+
C224
1000uF
R267
10K
R267
10K
R221
2.1K
R221
2.1K
R282
10K
R282
10K
C223
10nF
C223
10nF
C242
10nF
C242
10nF
+
C258
10uF
+
C258
10uF
C244
2.2nF
C244
2.2nF
R2E6
1K
R2E6
1K
BUS201
COPPER STRIP
BUS201
COPPER STRIP
R208
1.5K
R208
1.5K
Q214
2SC1815
Q214
2SC1815
R271
43K
R271
43K
~
~
+
-
BR202
DB104G
~
~
+
-
BR202
DB104G
HS210
70-010002-2
HS210
70-010002-2
R253
1K
R253
1K
D216
4.3V
D216
4.3V
C204
10nF
C204
10nF
Q230
2SC1815
Q230
2SC1815
Q228
2SC1815
Q228
2SC1815
R201
1K
R201
1K
C206
100nF
C206
100nF
HS209
70-010002-2
HS209
70-010002-2
~
~
+
-
BR203
DB104G
~
~
+
-
BR203
DB104G
+
C283
10uF
+
C283
10uF
D222
6.8V
D222
6.8V
C252
2.2nF
C252
2.2nF
F201
T1.6AL/250V
F201
T1.6AL/250V
C241
10nF
C241
10nF
Q233
2SC1815
Q233
2SC1815
R207
1.5K
R207
1.5K
Q203
2SC1815
Q203
2SC1815
+
C276
10uF
+
C276
10uF
Q206
2SA1837
Q206
2SA1837
C251
2.2nF
C251
2.2nF
C220
10nF
C220
10nF
C211
10nF
C211
10nF
R262
10K
R262
10K
D211
8.2V
D211
8.2V
~
~
+
-
BR204
KBJ2506
~
~
+
-
BR204
KBJ2506
Q216
2SB647
Q216
2SB647
D235
3.3V
D235
3.3V
R2E4
1K
R2E4
1K
D203
1N4148
D203
1N4148
R236
1K
R236
1K
F202
T1.6AL/250V
F202
T1.6AL/250V
C205
10nF
C205
10nF
Q209
2N5401
Q209
2N5401
J202
2PIN2.54-C
J202
2PIN2.54-C
1
2
R218
2.2K
R218
2.2K
+
-
IC203B
TL084CN
+
-
IC203B
TL084CN
5
6
7
R299
100
R299
100
R2E2
10K
R2E2
10K
+
C277
10uF
+
C277
10uF
Q239
30TPS08
Q239
30TPS08
3
1
2
R249
47
R249
47
R2E8
10K
R2E8
10K
+
C203
3300uF
+
C203
3300uF
Q201
KSA1220AYS
Q201
KSA1220AYS
BUS206
COPPER STRIP
BUS206
COPPER STRIP
R290
10K
R290
10K
R2E7
1K
R2E7
1K
R230
1K
R230
1K
R247
47
R247
47
Q236
30TPS08
Q236
30TPS08
3
1
2
R2E3
180
R2E3
180
D228
1N4148
D228
1N4148
C262
220pF
C262
220pF
R232
10K
R232
10K
C219
10nF
C219
10nF
C261
1uF
C261
1uF
R275
100
R275
100
C272
100nF
C272
100nF
R231
10K
R231
10K
~
~
+
-
BR207
~
~
+
-
BR207
HS205
70-046006-0
HS205
70-046006-0
R238
47
R238
47
HS208
70-010002-2
HS208
70-010002-2
Q235
2N5401
Q235
2N5401
+
C240
10uF
+
C240
10uF
R289
10K
R289
10K
R219
220
R219
220
R214
1.8K
R214
1.8K
R277
3.3K
R277
3.3K
R204
2.2K
R204
2.2K
IC201
LM7812CT
IC201
LM7812CT
O
3
I
1
G
2
P206B
FLEX CONNECTOR DIP16
P206B
FLEX CONNECTOR DIP16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
C234
47pF
C234
47pF
- 10 -
SCHEMATICS DIAGRAM