Schematic Diagram - NAD T 785 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
R5002
2 2.2u 50V
470 1/4W
Q5002
3 PO_FR B B
MMBT5551LT1
4
C5003 E E
5 PO_SL R5003
PO_SL
100p
10k
6
100V
7 PO_SR
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
2SB1275
C5119
150p Q5107
2SB1275
C
I_GND
Q5103
B
MMBT5551LT1
C
CEN. E
B Q5101
C5105
I_GND MMBT5551LT1
Q5104 10p
E
C5102 R5102 C C MMBT5551LT1
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
470
Q5206
2SB1275
C5219
150p Q5207
2SB1275
C
Q5203
B
MMBT5551LT1
C
E
B Q5201
SR
I_GND MMBT5551LT1
C5205
Q5204
E 10p
C5202 C C MMBT5551LT1
R5202
2.2u 50V
Q5202
B B
MMBT5551LT1
470
R5212
1/4W
E E
R5203 C5203 360
10k 100p 1/4W
100V C5206
10p
C
I_GND Q5205
B
MMBT5551LT1
E
R5208
270
R5213
1/4W
470
Q5306
2SB1275
C5319
Q5307
150p
2SB1275
C
Q5303
B
MMBT5551LT1
C
E
SBR B Q5301
I_GND MMBT5551LT1
E Q5304
C5302 R5302 C C MMBT5551LT1
2.2u 50V
Q5302
B B
MMBT5551LT1
470
1/4W R5312
E E
R5303 C5303 360
100p
10k 1/4W
100V
C5304
16V
470u
C
I_GND Q5305
B
MMBT5551LT1
E
R5308
270 R5313
1/4W
470
R5018
47
1/2W
Q5006
O_GND
2SB1275
C5012
Q5013
Q5008 100p
100V N.I.
MMBT5401LT1
Q5007
C5019
2SB1275 R5043
150p
R5024 0
Q5009 C5013
N.I.
2SB1275 100p R5041 1/4W
I_GND Q5012
0
MMBT5551LT1
R5023
C5007
1/2W N.I.
100p
C5005
I_GND
10p
R5017
R5025 R5044
56k
R5012 R5015 1/4W N.I. 0
R5021
360 10k 1/4W
1 2
1/4W
Q5010 1k C5014
C5006
10p 2SD1918
C5004 100p 100p
470u C5008
16V
R5042
0 Q5014
C N.I.
Q5011 C5015
B
100p
MMBT5551LT1
100V
E
O_GND
R5013
R5022
470 47
1/2W
R5118
47
1/2W
Q5117
2SD2560
O_GND
C5112
Q5113
100p
100V N.I.
R5131
Q5108
10k
MMBT5401LT1
R5124 R5143
N.I.
0
C5113 1/4W
100p R5141
2SB1275
Q5112
0
MMBT5551LT1
R5123
Q5109
1/2W
C5107
N.I.
100p I_GND 2
1
R5125 R5144
R5130
for BIAS
R5115 N.I. 0 0.22
R5121
1/4W 5W
10k
1 2
Q5110 1k C5114
100p 2SD1918 100p
C5108
Q5118
R5142
2SB1647
0 Q5114
C N.I.
C5115
Q5111
B
100p
MMBT5551LT1
100V
E
O_GND
R5122
47
1/2W
R5218
47
1/2W
Q5217
2SD2560
O_GND C5212
100p
Q5213
Q5208
100V
N.I.
MMBT5401LT1 R5231
R5243
R5224
0
N.I.
Q5209 C5213 1/4W
100p
2SB1275 R5241
I_GND 0
R5223
C5207
N.I.
100p
1/2W
Q5212 I_GND
MMBT5551LT1
R5217 R5225
R5244 R5230
56k N.I.
R5215 0 0.22
R5221
1/4W 1/4W 5W
10k
1 2
Q5210 1k C5214
100p 2SD1918 100p
C5208
Q5218
R5242
2SB1647
0 Q5214
C N.I.
C5215
Q5211
B
100p
MMBT5551LT1 100V
E
O_GND
R5222
47
1/2W
R5318
47
1/2W
Q5317
2SD2560
O_GND C5312 Q5313
Q5308
100p
N.I.
MMBT5401LT1 100V
R5324 R5343
N.I.
0
1/4W
Q5309 C5313
100p
2SB1275 R5341
I_GND
0
R5323
C5307
N.I.
1/2W
C5305
Q5312
100p I_GND
10p MMBT5551LT1
R5317 R5325 R5344
56k N.I.
R5315 0
1/4W R5321
1/4W
10k
1 2
Q5310 1k C5314
C5306
10p
100p 2SD1918 100p
C5308
Q5318
R5342
2SB1647
0 Q5314
C N.I.
Q5311 C5315
B
100p
MMBT5551LT1
100V
E
O_GND
R5322
47
1/2W
Q5017
2SD2560 R5034
33k
R5031
10k
Q5019
MMBT5551LT1
L5001
R5028
0.2uH
0.22
R5033
5W
20k
R5035
3.3 1W
2
1
P5001
for BIAS
R5030
R5036
0.22
R5032
5W 10
R5037
2W
330k
180k
O_GND O_GND
Q5018
2SB1647
R5134
33k
Q5119
MMBT5551LT1
L5101
0.2uH
R5133
20k
R5135
3.3 1W
R5137
180k
P5101
R5136
R5132 10
2W
330k
O_GND O_GND
R5234
33k
10k
Q5219
MMBT5551LT1
L5201
0.2uH
R5233
20k
R5235
3.3 1W
2
1
P5201
for BIAS
R5232 R5237 R5236
330k 180k 10
2W
O_GND O_GND
R5334
33k
R5331
10k
Q5319
MMBT5551LT1
L5301
0.2uH
R5333
20k
R5335
3.3 1W
2
1
P5301
for BIAS
R5332 R5337 R5336
330k 180k 10
2W
O_GND O_GND
42
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
M5401-A M5403-A M5404-A
M5402-A
1 1 1 1
2 2 2 2
C C C C
Q5401 Q5402 Q5403 Q5404
B B B B
DTC123EKA DTC123EKA DTC123EKA DTC123EKA
E E E E
DGND
M5406
To thermistor for ISC
2
1
M5407
To thermistor for ISC
2
1
DGND
R5416
R5414 1.2k
U5401-A
6.8k 3
+
1
2
- R5417
LL4148
D5415 AS358 27k 1%
R5415
12k
C5410
10u C5411
R5418
10u
16V
4.22k 1%
16V
DGND
DGND
8
U5401-C
AS358
U5401-B
4
AS358
R5424
1.2k
5
+
7 VOUT
DGND 6
- U5402
LM35DT
DGND
Q5406
D5407 MMBT5401LT1 R5425
LL4148
22.1k 1%
R5420 R5421
D5420
D5421 1k 47.5k
LL4148
LL4148 1%
R5423
R5422 820
10k
DGND
C
Q5407 B
DTC114EKA
E
DGND
R5040
1M
R5410
1k
R5140
Q5408
1M C
R5408 MMBT5401LT1
4.7k
Q5409
B
R5240 MMBT5551LT1
1M
E
Q5410
R5340 R5405
2SK771-5
1M 1M
G
C5405
1u
50V
DGND DGND DGND
Q5410A
G
J5403A
to SPEAKER
FR_B_SPK 1
FR_A_SPK 2
CENTER_SPK 3
SR_SPK 4
BSR_SPK 5
+15V +5V_K
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
+5V_K 11
+15V 12
13
M5405-A
14
1
15
16
2
DGND
17
18
19
C
20
Q5405
B
DTC123EKA
+5V_K
E
J5401A
to CONN#3 (J5401B)
28
DGND
27
+12V_D 26
+5V_K
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
11
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
R5426
1.2k
U5403
NJM7812
OUT IN
GND
DGND