NAD T 775 Service Manual page 43

First Production runs:
POWER AMPLIFIER LEFT-CH
T71T775G00001-T71T775G00028 &
T78T775G00029-T78T775G00510
Q5503
MMBT5551LT1
Q5501
I_GND MMBT5551LT1
FL Q5504
C5502 R5502
2.2u 50V MMBT5551LT1
Q5502
PO_FL
MMBT5551LT1
470
1/4W
C5503
R5503
100p
10k
100V
I_GND
Q5505
MMBT5551LT1
R5508
270
1/4W
R5832
N.I.
I_GND O_GND
CHGND CHGND CHGND
Q5603
MMBT5551LT1
Q5601
I_GND MMBT5551LT1
SL
Q5604
C5602 R5602
2.2u 50V MMBT5551LT1
Q5602
PO_SL
MMBT5551LT1
470
R5612
1/4W
C5603
R5603 360
100p
1/4W
10k
100V
I_GND
Q5605
MMBT5551LT1
R5608
270
1/4W
C5719
150p
SBL
Q5703
MMBT5551LT1
Q5701
I_GND MMBT5551LT1
Q5704
C5702 R5702
2.2u 50V
MMBT5551LT1
Q5702
PO_BSL
MMBT5551LT1
470
R5712
1/4W
C5703
360
R5703
100p
1/4W
10k 100V
C5704
470u
16V
I_GND
Q5705
MMBT5551LT1
R5708
270
1/4W
R5518
47
1/2W
C5516
Q5506 C5512
100p
O_GND 100V
MMBT5401LT1 100p Q5513
MMBT5551LT1 Q5515
2SD1918
C5519
150p Q5507 Q5508
MMBT5401LT1
2SB1275
C5513
100p
I_GND Q5509
R5523 R5526
2SB1275
Q5512 1k
C5507 220
1/2W
1/2W
C5505
100p
10p
100V MMBT5551LT1 I_GND
R5515
R5521 C5514
R5512 10k
1 2 100p Q5516
360 100V
C5506 Q5510 1k 2SB1275
C5504
10p 100p 2SD1918
470u
16V C5508
100V
Q5514
MMBT5401LT1
C5515
Q5511
100p
MMBT5551LT1
100V
O_GND
R5513
R5522
47
100
1/2W
R5618
47
1/2W
O_GND
Q5606
C5612
MMBT5401LT1
Q5613
100p
Q5608 100V MMBT5551LT1 Q5615
2SD1918
C5619 MMBT5401LT1
150p Q5607
2SB1275
C5613
100p
100V
I_GND
Q5609 R5626
R5623
2SB1275 220
1k
1/2W 1/2W
C5607
C5605
Q5612 I_GND
100p
10p
100V MMBT5551LT1
R5617 Q5616
56k
R5615 2SB1275
1/4W R5621
C5614
10k
1 2
100p
Q5610
1k 100V
C5606
2SD1918
10p
100p
C5608
C5604 100V
470u
16V
Q5614
MMBT5401LT1
C5615
Q5611
100p
MMBT5551LT1 100V
O_GND
R5613
R5622
100
47 1/2W
R5718
47 1/2W
C5716
Q5706
C5712 100p
MMBT5401LT1 O_GND
100V
100p Q5713
100V MMBT5551LT1
Q5708
MMBT5401LT1
Q5707
2SB1275
C5713
100p
C5710 100V
I_GND Q5709
R5723
0.1u R5726
2SB1275
1k
220
1/2W
1/2W
C5707
100p
C5705 100V Q5712
10p MMBT5551LT1
R5717
I_GND
R5715 56k
R5721
1/4W C5714
10k
1 2
100p
C5706
1k 100V
Q5710
10p
100p C5717
2SD1918
C5708 100p 2SB1275
100V
Q5714
MMBT5401LT1
C5715
Q5711
100p
MMBT5551LT1
100V
O_GND
R5713 R5716
R5722
47
100 47
1/2W
R5538 R5539
D5510
15k 22k LL4148
Q5517
M5804-B
2SC5669
R5534 R5638 R5639
D5610
15k 22k LL4148
33k
R5531
M5803-B
R5738 R5739
10k D5710
Q5519 15k 22k LL4148
MMBT5551LT1
M5802-B
L5501 0.2uH
R5533
1.5k M5801-B
R5535
3.3 1W
2 R5537
180k
1 C5518
0.1u_M
P5501 100V
for BIAS
R5536
R5532
10
2W
180k
O_GND O_GND
Q5518
2SA2031
B
Q5617
2SC5669
R5634
33k
R5631
10k
Q5619
MMBT5551LT1
L5601 0.2uH
R5633
1.5k
R5635
3.3 1W
2 R5637
1 180k
C5618
0.1u_M
P5601 100V
for BIAS
R5636
R5632
10
2W
180k
O_GND O_GND
Q5618
2SA2031
J5805A
to FAN
1
2
J5806A
to FAN
1
2
J5807A
to FAN
1
Q5717
2SC5669 2
R5734
33k
J5808A
Q5715
R5731 to FAN
2SD1918 10k
1
Q5719
MMBT5551LT1 2
L5701 0.2uH J5809A
R5733
to FAN
1
1.5k
R5735
3.3 1W 2
2 R5737
180k C5718
1
0.1u_M
P5701 100V
for BIAS
R5736
R5732 10
2W
180k
Q5716
O_GND O_GND
DGND
Q5718
2SA2031
R5540
1M
1 2
R5640
1M
1 2
R5740 R5822
1M 1M
1 2 1
LL4148
D5808
DGND
42a
FL(B)
FL(A)
SL
SBL
M5805
To thermistor for ISC (left)
1
2
M5801-A M5802-A M5803-A M5804-A
1 1 1 1
2 2 2 2
DGND
C C C C
B B B
Q5801 Q5802 Q5803 Q5804
DTC123EKA DTC123EKA DTC123EKA
DTC123EKA
E E E E
DGND
Q5805
R5801
MMBT5551LT1
33k
Q5806
MMBT5551LT1
R5802
R5803
33k
47k
O_GND O_GND
C5803
C5802 R5804
22k 0.022u
1000p
50V
MMBT5401LT1
Q5807
R5805
C5804
10k
0.022u
50V
U5502-A
R5808
R5806 LM358 1.2k
C5805 8 6.8k 3 1 2
U5502-C +
1 2 1
0.1u
LM358 2
- R5809 R5811
4 LL4148
27k 1% 1.2k
D5804
1 2
R5807
12k
DGND
R5810
4.22k
1%
DGND
U5503
R5819
LM35DM
27k
U5502-B
R5816
1/4W LM358
1.2k C5807
5 1 2
+ 0.1u
7 VOUT
6
-
D5813
LL4148 DGND
Q5808
D5805 MMBT5401LT1 R5817 R5818
LL4148 22.1k 1% 1.2k
1 2 1 2
R5820 R5821 R5812 R5813
47.5k
390 2.2k 1k
1%
R5831
12k R5815
R5814
10k 820
C
DGND
B DGND
Q5809
DTC114EKA
E
DGND
+12V
R5827
U5805
1k
LM7812
Q5811
OUT IN
R5826
MMBT5401LT1
4.7k
Q5810
1 2 GND
MMBT5551LT1
Q5812
2SK771-4
D
2 G
C5816
1u
S
50V DGND
DGND DGND
D
Q5812A
G
N.I.
S
J5802A
To Speaker Out
1
2
3
4
J5803A
To ISC J5803B
ISC_THM_L 1
DGND 2
ISC_SEN_L 3
J5810A
To ISC J5810B
ISC_THM_R 1
DGND 2
ISC_SEN_R 3
J5804A
+5VD
To Secondary
V+ 1
28
V- 2
DGND
27
O_GND 3
+12V_D
26
+5VD
O_GND O_GND 25
DGND
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
To CONN#3 (J5801B)
J5801A
I_GND I_GND
+5VD
0.1u
C5811
U5501
HCF4094B
1 STROBE VDD 16
DGND
2 DATA 15
O/P_ENABLE
3 CLOCK 14
Q5
4 Q1 13
Q6
5 Q2 12
Q7
6 Q3 11
Q8
7 Q4 10
QS
8 VSS 9
QS
DGND