NAD CI940, Service Manual, Page: 9 / 36

1.MAIN BOARD (1/2)
1 1
O/C
DC Fault
O/C
DC Fault
D402
4.7V
D810
4.7V
R336
1K
D807
1N4148
R331
51
+
C802
680uF
C423
120pF
R458
N.I.
R405
470
R429
1K
R439
1K
R441
22K
Q303
2SA970
R436
1K
Q801
2SC1815
R417
100
R337
22K
R323
47
Q414
N.I.
Q402
2SA970
R516
N.I.
1 2
R
L6
01
C
JQ
X-
11
5F
02
4-
2H
S4
AF
CW
1
3
2
RV401
200
C418
22nF
D303
1N4148
R428
1K
C305
100pF
R513
N.I.
R407
10K
D404
1N4148
R357
N.I.
Q304
2SA970
R416
1meg
C319
100nF
+
C335
N.I.
R514
N.I.
D808
24V
D306
1N4148
R302
10K
R309
2.2K
R318
180
R603
4.7K
Q301
2SC2240
R327
866
R444
10
+
C317
10uF
R313
1K
R300
100K
+
-
3
2
1
IC601A
TL082CP
R312
100
R443
3.3
Q404
2SA970
R445
8.2K
R 341
22K
+
C809
1uF
C323
120pF
C414
47nF
R440
22K
Q410
2SB649A
Q313
2N5551
D803
4.7V
R305
470
R311
390
R 338
1K
R425
4.7K
L402
1uH
+
-
5
6
7
8
4
IC601B
TL082CP
+
C302
220uF
R426
1.2K
R315
1K
R820
100K
C313
1uF
Q405
2SC2240
+
C404
10uF
C
41
2
47
pF
R611
10
Q3 10
2S B 649A
R435
1K
R811
22K
R404
22K
R303
22K
R433
0.068
+
C315
47uF
R307
10K
R419
82
R328
1K
C803
220nF
C 421
100nF
Q308
KSC2690
C324
470pF
R427
866
Q408
KSC2690
Cannot open
fi le
E:\CI940\C2
45\Imp orted
C245BEE
POWERAM
P
VM1.0.PRJP
CB\Image.b
mp
HS301
HEATSINK
R813
47K
R 403
22K
Q316
2SD669A
+
C810
1uF
R823
22K
C406
1uF
Q411
2SA2121
R519
N.I.
C321
100nF
R321
1meg
R326
1.2K
R418
180
Q302
2SA970
Q804
2SA1015
C309
100nF
D403
1N4148
R330
27
C420
100nF
R437
22K
R306
3.3K
1
3
2
4
TP301
CON2.54X4
+
C402
220uF
R819
22K
R343
3.3
+
C434
N.I.
R423
47
+
C416
220uF
D806
24V
R413
1K
R402
10K
C405
100pF
+
C417
10uF
C424
470pF
+
C605
4.7uF
Q305
2SC2240
L401
100uH
L302
1uH
R438
1K
C312
47pF
C413
1uF
L301
100uH
R
61
2
4.
3K
R457
N.I.
C308
10pF
R317
100
R324
4.7K
R308
100
R816
10K
+
C435
N.I.
Q602
2N5401
R316
1meg
R 339
1K
R358
N.I.
R 334
51
Q409
2SD669A
Q413
2N5551
Q416
2SD669A
D505
N.I.
R320
4.3K
R411
390
C408
10pF
R442
56K
Q307
2SA1360
R430
27
C419
100nF
Q315
N.I.
5
6
R L601B
JQX-115F024-2HS4AF
+
C801
47uF
R344
10
Q314
N.I.
+
C415
47uF
R515
N.I.
R817
10K
R821
22K
D 305
1N 4148
R431
51
R310
2.2K
+
C506
N.I.
R422
100K
R332
0.068
Q407
2SA1360
R818
270
R322
100K
R434
51
C318
22nF
C307
47pF
R421
1meg
5
6
4 1
2
3
S601
SK-22F03-G6
C407
47pF
R301
470
3
4
RL601A
JQX-115F024-2HS4AF
D301
1N4148
R412
100
Q306
2SA1015
R409
2.2K
Q309
2SD669A
Q412
2SC5949
+
C303
10uF
R342
56K
Q415
N.I.
R812
N.I.
R319
82
1
3
2
4
TP401
CON2.54X4
Q3 12
2S C 5949
+
C507
N.I.
D406
1N4148
D302
4.7V
R408
100
+
C 403
10uF
R314
330
1
2
CB801
90DEG
1
2 3
4
5
6
7
8
IC801
HS1237
D304
1N4148
C306
1uF
+
C301
10uF
C314
47nF
1 2
RL501C
JQX-115F024-2HS4AF
R304
22K
R424
4.7K
D809
1N4148
Q803
2SC1815
R345
10K
R518
N.I.
+
C334
N.I.
R432
0.068
Q311
2SA2121
R335
1K
R410
2.2K
D405
1N4148
+
C 316
220uF
Cannot open
fi le
E:\CI940\C2
45\Imp orted
C245BEE
POWERAM
P
VM1.0.PRJP
CB\Image.b
mp
HS401
HEATSINK
C422
120pF
D 401
1N4148
+
C401
10uF
R400
100K
R414
330
R325
4.7K
R340
22K
Q406
2SA1015
R420
4.3K
R604
10K
C322
120pF
D506
N .I.
+
C304
10uF
1
2
CB802
90DEG
R 333
0.068
Q802
2SA1015
R329
1K
R824
22K
Q401
2SC2240
C320
100nF
R401
470
Q403
2SA970
R406
3.3K
+
C311
220uF
C310
100nF
CW
1
3
2
RV301
200
+
C411
220uF
R415
1K
-15V
VCC
VCC
VSS
V SS
+15V
-15V
VCC
+15V
VSS
VCC
VCC
DC Fault
O/C
DC Fault
O/C
Protect
AC OFF
SP A
SP B
C H 3
C H 4
/1W
/1W
/63V
/1%
/1/4W/1%
/1W
/1/2W
/1W
/63V
/1%
/1/4W/1%
/1/2W
/16V
/16V
TEST POINT
/1KV
/1
KV
/1KV
/63V
/1KV
/3W
/3W
/1/2W
TEST POINT
BRIDGE
STEREO POSITION
/1KV
/1KV
/1KV
/63V
/1
/4
W
/1
%
/1KV
/3W
/3W
/1/2W
FOR Q308/Q309/Q310
FOR Q408/Q409/Q410
/25V
/16V
/1W
/1W
/1KV
/1KV
/1W
/1W
/1W
/1W
/2W
/2W
/1W
/6.3V
/1KV
/1KV
/1KV
/1KV
1
2
3
4
JA03
4PIN /5MM
R827
27K
CIRCUIT DIAGRAMS