Schematic Diagram - NAD T 775 Service Manual

SCHEMATIC DIAGRAM

POWER AMPLIFIER RIGHT-CH
C Q5003
FR MMBT5551LT1
B
C
E
Q5001
J5404A B
to PRE-OUT (J5404B) I_GND MMBT5551LT1
Q5004
1 PO_FL PO_FL
E MMBT5551LT1
I_GND
C5002 C C
2 R5002
2.2u 50V
470 1/4W Q5002
B B
3 PO_FR
MMBT5551LT1
4
E E
5 PO_SL R5003 C5003
PO_SL
100p
10k
6
100V
7 PO_SR C5004
8
9 PO_BSL PO_BSL
10
C
I_GND
11 PO_BSR
Q5005
B
12 MMBT5551LT1
13 PO_CEN E
14
R5008
270
1/4W
I_GND
I_GND
CHGND
I_GND
R5427
N.I.
O_GND
CHGND CHGND Q5106
MMBT5401LT1
C5119
150p Q5107
2SB1275
C
I_GND
Q5103
B
MMBT5551LT1
C
E
CEN.
Q5101
B
I_GND C5105
MMBT5551LT1
Q5104 10p
E
C5102 C C MMBT5551LT1
R5102
2.2u 50V
Q5102
B B
MMBT5551LT1
470
1/4W R5112
C5103 E E
R5103 360
100p
10k 1/4W
100V C5106
10p
C5104
470u
16V
C
I_GND
Q5105
B
MMBT5551LT1
E
R5108
270
R5113
1/4W
100
Q5206
MMBT5401LT1
C5219
150p Q5207
2SB1275
C
Q5203 I_GND
B
MMBT5551LT1
C
E
Q5201
B
SR I_GND MMBT5551LT1
C5205
Q5204
E 10p
C5202 R5202 C C MMBT5551LT1
2.2u 50V
Q5202
B B
MMBT5551LT1
470
1/4W R5212
C5203 E E
R5203 360
100p
10k 1/4W
100V C5206
10p
C
I_GND Q5205
B
MMBT5551LT1
E
R5208
270
R5213
1/4W
100
Q5306
MMBT5401LT1
C5319
Q5307
150p
2SB1275
C
Q5303
B
MMBT5551LT1
C
E
Q5301
SBR B
I_GND MMBT5551LT1
Q5304
E
C5302 R5302 C C MMBT5551LT1
2.2u 50V
B Q5302 B
MMBT5551LT1
470
1/4W R5312
E E
R5303 C5303
360
10k 100p 1/4W
100V C5306
C5304
16V
470u
C
I_GND Q5305
B
MMBT5551LT1
E
R5308
270 R5313
1/4W
100
First Production runs:
T775G00001-T71T775G00028 &
T78T775G00029-T78T775G00510
R5018
47
1/2W
Q5006
MMBT5401LT1 O_GND
C5012
Q5013
Q5008 100p
100V MMBT5551LT1
MMBT5401LT1
Q5007
C5019
2SB1275
150p
R5024
Q5009 C5013
47
2SB1275 100p 1/4W
I_GND Q5012
MMBT5551LT1
R5026
R5023 220
C5007
1k 1/2W
100p 1/2W
C5005
I_GND
10p
R5017
56k
R5015 1/4W
R5012 R5021
360 10k
1 2
1/4W
Q5010 1k C5014
C5006
10p 2SD1918 100p
100p
470u C5008
16V
Q5014
MMBT5401LT1
C
C5015
B Q5011
100p
MMBT5551LT1
100V
E
O_GND
R5013
R5022
100 47
1/2W
R5118
47
1/2W
C5116
Q5117
100p
2SC5669
100V
O_GND
C5112 Q5115
2SD1918
100p Q5113
100V MMBT5551LT1
R5131
Q5108
10k
MMBT5401LT1
C5113
100p
2SB1275 Q5112
MMBT5551LT1 R5126
R5123
Q5109
C5107 1/2W 220
1/2W
1k
100p I_GND 2
1
R5125 R5129 P5101
R5130
47 4.7 for BIAS
R5115 0.22
R5121
1/4W 1/4W 5W
10k
1 2
Q5116
Q5110 1k C5114
2SB1275
2SD1918 100p
100p
C5117
C5108
100p
100V
Q5114 Q5118
2SA2031
MMBT5401LT1
C
C5115
Q5111
B
100p
MMBT5551LT1
100V
E
O_GND
R5122
47
1/2W
R5218
47
1/2W
Q5217
2SC5669
O_GND C5212
100p
Q5213
Q5208
100V Q5215
MMBT5551LT1 R5231
MMBT5401LT1
2SD1918
10k
R5224
47
C5213
Q5209 1/4W
100p
2SB1275
R5226
R5223
220
C5207 1k 1/2W
100p
1/2W
Q5212 I_GND
2
MMBT5551LT1
1
R5217
R5229 P5201
R5230
R5215 56k 4.7 0.22 for BIAS
R5221 1/4W 5W
1/4W
10k
1 2
Q5216
Q5210 1k C5214 2SB1275
100p 2SD1918 100p
C5208
Q5214 Q5218
2SA2031
MMBT5401LT1
C
C5215
Q5211
B
100p
MMBT5551LT1 100V
E
O_GND
R5222
47
1/2W
R5318
47
1/2W
Q5317
2SC5669
O_GND C5312 Q5313
Q5308
100p
MMBT5401LT1 100V MMBT5551LT1 Q5315
R5331
2SD1918
Q5309 C5313
100p
2SB1275
I_GND
R5326
R5323
C5307 220
1k 1/2W
1/2W
C5305
Q5312
100p
10p I_GND
MMBT5551LT1
R5317
Q5316
56k
R5315 2SB1275
1/4W
R5321
10k
1 2
1k C5314
Q5310
10p
100p 2SD1918 100p
C5308
Q5318
Q5314
2SA2031
C MMBT5401LT1
C5315
Q5311
B
MMBT5551LT1 100p
100V
E
O_GND
R5322
47
1/2W
Q5017
2SC5669
R5034
33k
Q5015
R5031
2SD1918 10k
Q5019
MMBT5551LT1
L5001
R5028
0.2uH
0.22
R5033
5W
1.5k
R5035
3.3 1W
2
1
P5001
for BIAS
R5029
R5030
R5036
4.7 0.22
R5032
1/4W 5W 10
Q5016 R5037
2W
2SB1275 180k
180k
O_GND O_GND
Q5018
2SA2031
R5134
33k
Q5119
MMBT5551LT1
L5101
0.2uH
R5133
1.5k
R5135
3.3 1W
R5137
180k
R5136
R5132 10
2W
180k
O_GND O_GND
R5234
33k
Q5219
MMBT5551LT1
L5201
0.2uH
R5233
1.5k
R5235
3.3 1W
R5232 R5237 R5236
180k 180k 10
2W
O_GND O_GND
R5334
33k
10k
Q5319
MMBT5551LT1
L5301
0.2uH
R5333
1.5k
R5335
3.3 1W
2
1
P5301
for BIAS
R5332 R5337 R5336
180k 180k 10
2W
O_GND O_GND
41a
R5038 R5039
D5411
15k 22k LL4148
R5138 R5139
D5412
15k 22k LL4148
R5238 R5239
D5413
15k 22k LL4148
M5405-B
R5338 R5339 FR(B)
D5414
15k 22k LL4148
FR_O
M5401-B
FR(A)
FR_O
M5402-B
CENTER
C_O
M5403-B
SR
SR_O
M5404-B
SBR
BSR_O
M5403-A M5404-A
M5401-A M5402-A
1 1 1 1
2 2 2 2
C C C C
B Q5401 B Q5402 B Q5403 B Q5404
DTC123EKA DTC123EKA DTC123EKA DTC123EKA
E E E E
DGND
M5406
To thermistor for ISC
2
1
DGND
R5416
R5414
U5401-A 1.2k
6.8k 3
+
1
2
- R5417
LL4148
LM358D 33k 1%
D5415 R5415
12k
R5418
4.22k
1%
DGND
DGND
8
U5401-C
LM358D
U5401-B
4
LM358D R5424
1.2k
5
+
7 VOUT
DGND
6
- U5402
LM35DM
DGND
Q5406
R5425 R5426
D5407 MMBT5401LT1
LL4148 22.1k 1% 1.2k
R5420 R5421
1k 47.5k
1%
R5423
R5422 820
10k
C DGND
Q5407
B
DTC114EKA
E
DGND
R5040
1M
R5410
1k
R5140
Q5408
1M
R5408 C
MMBT5401LT1
4.7k
Q5409
B
MMBT5551LT1
R5240
1M
E
Q5410
R5340 R5405
2SK771-4
1M 1M
G
C5405
1u
50V
DGND DGND DGND
Q5410A
G
N.I.
J5403A
to SPEAKER
FR_B_SPK 1
FR_A_SPK 2
CENTER_SPK 3
SR_SPK 4
BSR_SPK 5
+15V +5VD
J2001B
to MCU (J2001A)
+12V_D 1
SC_1 2
SC_2 3
THM_PRO 4
OVLD_PRO 5
4094(1)_STB 6
4094_DATA 7
4094_CLK 8
DGND 9
DGND 10
+5VD 11
+15V 12
13
M5405-A
14
1
15
16
2
DGND
17
18
19
C
20
B Q5405
DTC123EKA
+5VD
E
J5401A
to CONN#3 (J5401B)
28
DGND
27
+12V_D
26
+5VD
25
4094(1)_STB
24
4094_DATA
23
4094_CLK
22
RELAY_C 21
RELAY_SB
20
RELAY_S
19
+15V
18
FAN_SEN 17
OVLD_PRO
16
V_DET
15
I_DET
14
ISC_THM_R
13
THM_PRO 12
SC_1 SC_1 11
SC_2
SC_2 10
RELAY_F
9
RELAY_B
8
ISC_SEN_R 7
I_GND
6
PO_BSL
PO_BSL 5
I_GND
4
PO_SL
PO_SL 3
I_GND 2
PO_FL PO_FL 1
I_GND I_GND
DGND
J5402A
to PSU-SEC (J5402B)
V+ 1
V- 2
3
+12V
O_GND O_GND
R5419
1.2k
U5403
LM7812CT
OUT IN
GND
DGND