NAD CI940, Service Manual, Page: 10 / 36

1.MAIN BOARD (2/2)
12
O/C
DC Fault
CH 2
STBY
CH 1
R243
3.3
R215
1K
R511
10
R101
470
Q215
N.I.
R128
1K
Q110
2SB649A
R222
100K
R213
1K
R510
N.I.
C122
120pF
C114
47nF
R244
10
C223
120pF
D202
4.7V
Q107
2SA1360
Q114
N.I.
Q108
KSC2690
R138
1K
Q115
N.I.
Q205
2SC2240
R240
22K
R115
1K
1
2
3
S8
01
A
SK
-2
2F
03
-G
6
R205
470
R117
100
D105
1N4148
1
2
3
4
5
6
7
P802B
8PIN2.54-C
Q211
2SA2121
4
5
6
S8
01
B
SK
-2
2F
03
-G
6
C107
47pF
R119
82
C124
470pF
L102
1uH
R230
39
R125
4.7K
C808
100nF
Q113
2N5551
Q102
2SA970
R139
1K
C118
22nF
R130
39
R245
10K
C109
100nF
C841
100nF
+
C102
220uF
R207
10K
+
C111
220uF
Cannot open
file
E:\CI940\C245\
Imported
C245BEE
PO W ERA M P
V M 1.0.PR JPC B
\Image.bmp
1 2 3
BUS801
COPPER STRIPS
+
C204
10uF
R210
2.2K
R127
866
D106
1N4148
C106
1uF
F801
MF-R075/90U-0-99
R133
0.068
C205
100pF
D502
N.I.
R242
56K
+
C134
N.I.
R226
1.2K
Cannot open
fi le
E:\CI9 40\C2
45\Imp ort ed
C245BEE
PO W ERA M
P
V M 1.0.PR JP
CB\Image.b
mp
HS101
HEATSINK
+
C235
N.I.
R141
22K
Q105
2SC2240
L202
1uH
+
C215
47uF
R131
51
+
C201
10uF
CW
1
3
2
RV101
200
R104
22K
R203
22K
R140
22K
Q216
2SD669A
+
C116
220uF
+
C115
47uF
R100
100K
C110
100nF
C123
120pF
C213
1uF
R103
22K
R503
4.7K
R239
1K
R257
N.I.
R129
1K
Q502
2N5401
L101
100uH
R509
N.I.
R109
2.2K
5
6
4 1
2
3
S 501
SK-22F03-G6
Q106
2SA1015
+
-
3
2
1
IC501A
TL082CP
C221
100nF
L201
100uH
R801
10K
Q204
2SA970
D203
1N4148
R200
100K
R134
51
R236
1K
C120
100nF
R224
4.7K
C121
100nF
R122
100K
R214
330
R132
0.068
C807
100nF
C
21
2
47
pF
Q103
2SA970
R114
330
+
C211
220uF
Q207
2SA1360
R123
47
R202
10K
R126
1.2K
R507
N.I.
Q112
2SC5949
+
C216
220uF
R228
1
K
R204
22K
R144
10
R212
100
R505
N.I.
R107
10K
R206
3.3K
D101
1N4148
1
3
2
4
TP201
CON2.54X4
R231
51
+
C103
10uF
D503
N.I.
Cannot open
fi le
E:\CI9 40\C2
45\Imp ort ed
C245BEE
PO W ERA M
P
V M 1.0.PR JP
CB\Imag e.b
mp
H S 201
HEATSINK
C219
100nF
Q208
KSC2690
1
2
4
3
P803B
4PIN3.96-C
+
-
5
6
7
8
4
IC501B
TL082CP
+
C135
N.I.
CW
1
3
2
RV201
200
+
C217
10uF
R217
100
Q201
2SC2240
R157
N.I.
Q203
2SA97
0
C207
47pF
+
C234
N.I.
3
4
RL501A
JQX-115F024-2HS4AF
Q202
2SA970
C214
47nF
R508
N.I.
R121
1meg
R802
10K
R235
1K
R221
1meg
R238
1K
R120
4.3K
R225
4.7K
R124
4.7K
Q104
2SA970
5
6
RL501B
JQX-115F024-2HS4AF
R218
180
R142
56K
R229
1K
R137
22K
R822
100
R237
22K
R219
82
+
C203
10uF
D802
4.7V
C105
100pF
D102
4.7V
R118
180
R227
866
+
C505
4.7uF
Q109
2SD669A
R108
100
R233
0.068
R106
3.3K
R223
47
+
C101
10uF
D201
1N4148
+
C104
10uF
+
C117
10uF
1
G8G1
GROUND SOLDER TAP
R
51
2
4.
3K
+
C805
4700uF
C206
1uF
R232
0.068
Q210
2SB649A
R135
1K
1
2
3
4
5
6
7
8
9
10
11
P801B
10PIN2.54-C
1
2
3
4
5
J801
PHONEJACK STEREO SW
R208
100
R136
1K
R116
1meg
D206
1N4148
R113
1K
R111
390
Q101
2SC2240
R506
N.I.
R158
N.I.
D204
1N4148
Q209
2SD669A
Q116
2SD669A
C108
10pF
D103
1N4148
+
C806
4700uF
F802
MF-R075/90U-0-99
D205
1N4148
R211
390
R258
N.I.
Q111
2SA2121
R110
2.2K
C208
10pF
R241
22K
R201
470
R102
10K
R145
8.2K
D104
1N4148
C113
1uF
R216
1meg
R220
4.3K
C218
22nF
1
3
2
4
TP101
CON2.54X4
R209
2.2K
C220
100nF
Q206
2SA1015
Q214
N.I.
+
C503
N.I.
+
C202
220uF
C222
120pF
R234
51
C112
47pF
R105
470
Q213
2N5551
C224
470pF
C119
100nF
R143
3.3
R805
10K
R112
100
Q212
2SC5949
+
C504
N.I.
R504
10K
VCC
VSS
-15V
+15V
VCC
VSS
+15V
VSS
-15V
VCC
+5V
VCC
VSS
+15V
-15V
O/C
DC Fault
Protect
SP B
SP A
AC OFF
CH 3
CH 4
/1KV
/1/2W
/63V
/63V
/3W
/1KV
/1/2W
/1KV
/1KV
/1W
/1W
/1/4W/1%
/3W
/1%
/16V
TEST POINT
/1W
/1W
/63V
/1%
/1/4W/1%
/1/2W
/16V
TEST POINT
/1KV
/1
KV
/1KV
/63V
/1KV
/3W
/3W
/1/2W
/1
/4
W
/1
%
B RIDGE
STEREO POSITION
All Poly este r capacito rs are 63V unless note d.
All Elec. capacito rs are 50V unless note d.
All Zener diodes are 1/2 W unless note d.
All Resisto r are 1/6 W unless note d.
FOR Q108/Q109/Q110
FOR Q208/Q209/Q210
+12V TRIG IN
SENSE DEFEAT
/1KV
/1KV
/1W
/1W
/1W
/1W
/2W
/2W
F
R
O
M
P
O
W
E
R
B
O
A
R
D
P
70
6A
F
R
O
M
P
O
W
E
R
B
O
A
R
D
P
70
5A
F
R
O
M
D
IS
P
L
A
Y
B
O
A
R
D
P
90
1A
/6.3V
F
R
O
M
I
N
P
U
T
B
O
A
R
D
P
A
01
A
/1KV
/1KV
/1KV
/1KV
1
2
3
4
5
6
7
8
9
10
11
P804B
10PIN 2.54-C
+
C811
1000uF /10
+5V
SENSE
1
2
3
4
JA04
4PIN/5MM
R825 10K
Input Mute
1
2
4
3
J2005
4P IN 3.96-C
12V D R 2008
N TC
R 2000
N TC
1
2
J307
CO N 2
R826
10K