NAD T 975 C/AH Service Manual page 11

POWER LED BOARD
Q334 Q334
+12VD 2SD667 2SD667
Q333 Q333
2SC1815 2SC1815
P301A P301A
R349 R349
+12VD 10K 10K
1
PROT1
2
PROT2
3
PROT3
+ +
4
C301 C301
PROT4
5 D312 D312
47uF 47uF /16V
PROT5
6 11V 11V /1/2W
PROT6
7
PROT7
8
SCLED
9
DGND
10
+5VD
11
STBYLED
12
R350 R350
12PIN2.0-A360B 12PIN2.0-A360B 360 360
P302A P302A
P701A P701A
GREEN
1 1
2 2
STBYLED
3 3
3PIN2.54-C 3PIN2.54-C
3PIN2.54-A130B 3PIN2.54-A130B
STBYLED
R301 R301 R308 R308 R302 R302 R309 R309
510 510 330 330 510 510 330 330
CH1 LED CH2 LED
Q301 Q301 Q308 Q308 Q302 Q302 Q309 Q309
2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815
D301 D301 D302 D302
R329 R329 R330 R330
R315 R315 R316 R316
10K 10K 10K 10K 10K 10K 10K 10K
BL-BUBB4274 BL-BUBB4274 BL-BUBB4274 BL-BUBB4274
R336 R336 R337 R337
R322 R322 R323 R323
10K 10K 10K 10K
10K 10K 10K 10K
Q315 Q315 Q322 Q322 Q316 Q316 Q323 Q323
2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015
All Polyester capacitors are 63V unless noted.
All Elec. capacitors are 50V unless noted.
All Resistor are 1/6W unless noted.
+5VD
R343 R343 R344 R344
56 56 120 120
STANDBY LED
Q329 Q329 Q330 Q330
2SA1015 2SA1015 2SC1815 2SC1815
STBYLED is +0.7V at normal working condition and is +5V at STNADBY mode.
R345 R345
10K 10K
PROT1-PROT7 each is +10.5V at normal working condition.When any
R347 R347
10K 10K
channel is in protection,the relevant PROT will be at -10.5V.
SCLED is floating at normal working condition,when Softclipping mode,
SCLED be connect to GND.
R348 R348
R346 R346
10K 10K
1K 1K
Q331 Q331 Q332 Q332
2SC1815 2SC1815
2SA1015 2SA1015
D310 D310
1N4148 1N4148
R303 R303 R310 R310 R304 R304
510 510 330 330 510 510
CH3 LED CH4 LED
Q303 Q303 Q310 Q310 Q304 Q304 Q311 Q311
2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815
D303 D303 D304 D304
R331 R331
R317 R317 R318 R318
10K 10K 10K 10K 10K 10K
BL-BUBB4274 BL-BUBB4274 BL-BUBB4274 BL-BUBB4274
R338 R338
R324 R324 R325 R325
10K 10K
10K 10K 10K 10K
Q317 Q317 Q324 Q324 Q318 Q318 Q325 Q325
2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015
R311 R311 R305 R305 R312 R312 R306 R306
330 330 510 510 330 330 510 510
CH5 LED CH6 LED
Q305 Q305 Q312 Q312 Q306 Q306 Q313 Q313
2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815
D305 D305 D306 D306
R332 R332 R333 R333
R319 R319 R320 R320
10K 10K 10K 10K 10K 10K 10K 10K
BL-BUBB4274 BL-BUBB4274 BL-BUBB4274 BL-BUBB4274
R339 R339 R340 R340
R326 R326 R327 R327
10K 10K 10K 10K
10K 10K 10K 10K
Q319 Q319 Q326 Q326 Q320 Q320 Q327 Q327
2SC1815 2SC1815 2SA1015 2SA1015 2SC1815 2SC1815 2SA1015 2SA1015
R313 R313 R307 R307 R314 R314
330 330 510 510 330 330
CH7 LED
Q307 Q307 Q314 Q314
2SA1015 2SA1015 2SC1815 2SC1815
D307 D307
R334 R334 R335 R335
R321 R321
10K 10K 10K 10K 10K 10K
BL-BUBB4274 BL-BUBB4274
R341 R341 R342 R342
R328 R328
10K 10K 10K 10K
10K 10K
Q321 Q321 Q328 Q328
2SC1815 2SC1815 2SA1015 2SA1015