Circuit Diagrams - NAD CI 980 Service Manual

CIRCUIT DIAGRAMS

1.MAIN AMP BOARD
CJ101A
R929
C935 C933
JS1107-36
220uF/50V 100nF/100V 4.75K/1W
1 2 +32V
3 4
5 6
-32V
7 8
C936
9 10 C934
220uF/50V R930
11 12
100nF/100V
4.75K/1W
13 14
15 16
17 18
19 20
21 22 VCC
CSD
23 24
FAULT1
25 26
27 28 +5VA
29 30 -5VS
31 32 L IN
33 34
R IN
35 36
R938
10K
R939
33K
R942
Q901
MMBT5551
R934
47K
L OUT R936
1K
Q902
MMBT5401
R OUT
C941 R937
10K
R935 100uF/25V
47K R941
47K
R913 R915
47.5K/1% 1K/1%
C913
150pF/500V
1
CLIP
2
COMP2
C901
10uF C905
C903
R901 R903 2.2nF/50V
2.2nF/50V
3.3K/1% 2.7K/1%
R IN 3
IN-2
R905
4
C907 IN+2
620
1nF/50V
5
GND
C909
10uF/10V
R907
10
6
-5VS VSS
C910
R908
10uF/10V
10
7
+5VA VAA
8
R906
IN+1
C902
620
10uF C908
R902
R904
1nF/50V
3.3K/1% 2.7K/1%
L IN 9
IN-1
C904 C906
2.2nF/50V 2.2nF/50V
10
COMP1
D902
1N4148
R910
C911
CSD
100 10uF/16V
11
CSD
CSD1
D919
1N4148
FAULT 12
FAULT
D907
1N4148
R914 R916
47.5K/1% 1K/1%
C914
150pF/500V
+5VA
MMBT5401
Q904
10uF/16V
47K
R945
47K
R946
100K
Q903 +5VA
MMBT5551
R943
10K
R944
47K
-32V
C921
-32V 4.7uF/25V
D903 R919
1N4148 33K
R917
D904
4.7R
1N4148 C915
100nF/100V
IC901
IR4302
R923
1R
C917 C919
100nF/250V
100nF/100V
R951
18R
23
VS2
22
VN2
21
VN1
20
VS1
R952
18R
R924
1R
C920
C918
100nF/100V 100nF/250V
R918 D906 C916
1N4148
4.7R 100nF/100V
VCC
R920
D905
33K
1N4148
+32V
C922 R922
C943
4.7R
4.7uF/25V
-32V
11
+32V
C971
47pF/100V
+32V
L901
22uH@10A C931 D915 C951
10nF/200V R OUT MURS120 2.2nF/100V
L903
C927
INDUCTOR COMMON-B
C925
R927 D916
100nF/63V
1
470nF/250V
2.2K/1W MURS120
R925 3
10/1W
-32V
-32V
+32V
5
-32V R926
10/1W 7
C926
R928
470nF/250V
C928 D917
2.2K/1W
100nF/63V
MURS120
L OUT
C952
L902
C932 D918
2.2nF/100V
22uH@10A
10nF/200V MURS120
-32V
C972
47pF/100V
R931
22R
C938
100nF/50V
C939
100nF/50V
R932
22R
C945
100nF/50V
C959 C961
2.2nF/100V NC
C953
2.2nF/100V
C955 C957
2.2nF/100V NC
2
4 4
3
2
6 1
8
C958
C956
2.2nF/100V NC
C954
2.2nF/100V
C960 C962
2.2nF/100V
NC