NAD C275BEEC/AH, Service Manual, Page: 8 / 36

VCC
ISC
BR
SCN/MUTE
PROTECT L
SCP
ISC
RELAY
SCN/MUTE
PROTECT R
SCP
L O/P
R O/P
VSS
BRIDGE
12V TRIG IN
DGND
MUTE
SEN DEFEAT
SC LED
TRIG ENABLE
PROTECT
SIGNAL
+15V
AGND
+5V
BG LED
+26V
-80V
+80V
+15V
+80V
-80V
+15V
-15V
+80V
-80V
+15V
-15V
VCC
VSS
-15V
-26V
-26V
+36V
+36V
+36V
+26V
-26V
+5V
+5V
+5V
+15V
+5V
+26V
+5V
/100V
/100V
/250V
/100V
/100V
/2
5
0
V
/100V
/100V
F
R
OM
M
A
IN
T
R
ANSF
ORME
R
/250V
/250V
F
R
OM
M
A
IN
T
RANSF
ORME
R
/16V
/16V
TO
LEFT PO
W
ERAM
P
TO
RI
G
H
T PO
W
ERAM
P
/1%
/1%
/1%
/1%
/1%
/1%
/1/2W
/1/2W
SOFT CLIPPING
/50V
BRIDGE
STEREO POSITION
NORMAL POSITION
/2W
/1
6
0
V
/160V
/2
5
0
V
/2
5
0
V
FOR BR201&TH201 FOR BR202&TH202
FOR IC201&IC202 FOR IC203&IC204
SPEAKER A
SPEAKER B
/1W
/1
%
/1%
/1%
/1%
/1%
/1
%
/1
%
/1
%
/1KV
/1KV
TO
L/
R PO
W
ERAM
P
BOARD P
102B
BRIDGE
STEREO POSITION
T
O
DI
SPLAY BOARD
All Polyester capacitors are 63V unless noted.
All Elec. capacitors are 50V unless noted.
All Zener diodes are 1/2W unless noted.
All Resistor are 1/6W unless noted.
/1KV
/1KV
/1W
SENSE DEFEAT
+
1
2
V
T
R
IG
IN
/6.3V
Fixed/Variable In
FIXED POSITION
TO
LEFT PO
W
E
RAM
P
TO
R
IG
H
T PO
W
E
RAM
P
INPUT
S
IGNAL
/6.3V
/3W
All Polyester capacitors are 63V 10% unless noted.
All Elec. capacitors are 50V 20% unless noted.
All Resistor are 1/6W 5% RJ13 unless noted.
All Zener diode are 1/2W unless noted.
+
C236
10uF
+
C236
10uF
R254
330K
R254
330K
R218
240
R218
240
R2
1
2
4.
7K R2
1
2
4.
7K
R236
3.3
R236
3.3
+
C212
2200uF
+
C212
2200uF
R224
24.9K
R224
24.9K
C252
10pF
C252
10pF
R227
1K
R227
1K
C220
100nF
C220
100nF
C
210
10nF
C
210
10nF
P208A
8PIN2.54-A200B
P208A
8PIN2.54-A200B
2
3
4
1
5
6
7
8
R230
100K R230
100K
D214
1N4148
D214
1N4148
R222
56K
R222
56K
R262
N.I.
R262
N.I.
C239
N.I.
C239
N.I.
R225
1K
R225
1K
C226
100nF
C226
100nF
R214
240
R214
240
R229
2.2K
R229
2.2K
R240
820
R240
820
IC201
NJM317F
IC201
NJM317F
O
2
I
3
ADJ
1
D215
1N4148
D215
1N4148
R
215
2.
67K
R
215
2.
67K
IC204
LM337T
IC204
LM337T
O
3
I
2
ADJ
1
C
230
100nF
C
230
100nF
L201
1uH
L201
1uH
R241
4.7K
R241
4.7K
CW
RV201A
1KA
CW
RV201A
1KA
3 1
2
C
209
10nF
C
209
10nF
RL202A
JQX-115F/036/1HS1
RL202A
JQX-115F/036/1HS1
3
4
D202
1N4148
D202
1N4148
R263
220
R263
220
D209
1N4148
D209
1N4148
S204B
SK-22F03-G7
S204B
SK-22F03-G7
4
5
6
P206B
11PIN2.54-C
P206B
11PIN2.54-C
1
2
3
4
5
6
7
8
9
10
11
R248
10K
R248
10K
D205
1N4148
D205
1N4148
PAD6
Solder Pad
PAD6
Solder Pad
L202
1uH
L202
1uH
Q206
2SA1015
Q206
2SA1015
R202
22K
R202
22K
+
-
IC206A
TL082CP
+
-
IC206A
TL082CP
3
2
1
PAD2
Solder Pad
PAD2
Solder Pad
R206
1K
R206
1K
R251
100K
R251
100K
R234
22K
R234
22K
+
C218
10uF
+
C218
10uF
R244
10K
R244
10K
PAD5
Solder Pad
PAD5
Solder Pad
R253
100K R253
100K
R208
1K
R208
1K
HS202
70-004003-1
HS202
70-004003-1
C227
100nF
C227
100nF
R266
1meg
R266
1meg
RL202B
JQX-115F/036/1HS1
RL202B
JQX-115F/036/1HS1
1
2
HS203
70-004003-1
HS203
70-004003-1
R255
10K
R255
10K
R242
10K
R242
10K
PAD4
Solder Pad
PAD4
Solder Pad
R
211
4.
7K R
211
4.
7K
R220
N.I.
R220
N.I.
D218
1N4148
D218
1N4148
C259
100pF
C259
100pF
R257
100K
R257
100K
~
~
+ -
BR201
KBU8D
~
~
+ -
BR201
KBU8D
+
C204
10uF
+
C204
10uF
RCA201B
2 HOLES
RCA201B
2 HOLES
2
3
R252
100K
R252
100K
S202A
SK-22F03-G7
S202A
SK-22F03-G7
1
2
3
P201B
5PIN3.96-C
P201B
5PIN3.96-C
1
2
4
5
3
+
C253
10uF
+
C253
10uF
C206
100nF
C206
100nF
+
C203
10uF
+
C203
10uF
+
C250
10uF
+
C250
10uF
PAD3
Solder Pad
PAD3
Solder Pad
R232
22K
R232
22K
R267
47K
R267
47K
R205
1K
R205
1K
+
C213
2200uF
+
C213
2200uF
Q204
MPSA42
Q204
MPSA42
D213
1N4148
D213
1N4148
TH202
BT151-500R
TH202
BT151-500R
3
1 2
R238
10K
R238
10K
R261
N.I.
R261
N.I.
RL201B
JQX-115F/036/1HS1
RL201B
JQX-115F/036/1HS1
1
2
+
C235
10uF
+
C235
10uF
D220
1N4148
D220
1N4148
+
C219
10uF
+
C219
10uF
+
C255
10uF
+
C255
10uF
S204A
SK-22F03-G7
S204A
SK-22F03-G7
1
2
3
C205
100nF
C205
100nF
C234
220nF
C234
220nF
+
C244
100uF
+
C244
100uF
C243
10pF
C243
10pF
+
C2
2
8
1000uF
+
C2
2
8
1000uF
C249
100nF
C249
100nF
D204
24V
D204
24V
+
C216
10uF
+
C216
10uF
R249
10K
R249
10K
C221
100nF
C221
100nF
R217
240
R217
240
S201
SK-22F03-G7
S201
SK-22F03-G7
5
6
4 1
2
3
R223
24.9K
R223
24.9K
P204A
5PIN3.96-AxxB
P204A
5PIN3.96-AxxB
1
2
3
4
5
R243
10K
R243
10K
R226
1K
R226
1K
Q205
2SA1015
Q205
2SA1015
R260
330K
R260
330K
C260
100nF
C260
100nF
R265
1meg
R265
1meg
+
C217
10uF
+
C217
10uF
P202B
5PIN3.96-C
P202B
5PIN3.96-C
1
2
4
5
3
S202B
SK-22F03-G7
S202B
SK-22F03-G7
4
5
6
C2
0
2
10nF
C2
0
2
10nF
D217
1N4148
D217
1N4148
C258
100pF
C258
100pF
S203
SK-22F03-G7
S203
SK-22F03-G7
5
6
4 1
2
3
R210
220K R210
220K
C256
100nF
C256
100nF
R258
100K
R258
100K
R203
22K
R203
22K
R237
3.3
R237
3.3
C237
10nF C237
10nF
D211
1N4148
D211
1N4148
R239
180
R239
180
+
C225
10uF
+
C225
10uF
C247
100nF
C247
100nF
C214
100nF
C214
100nF
+
-
IC206B
TL082CP
+
-
IC206B
TL082CP
5
6
7
8
4
P203B
12PIN2.54-C
P203B
12PIN2.54-C
1
2
3
4
5
6
7
8
9
10
11
12
Q207
2SC1815
Q207
2SC1815
D201
1N4007
D201
1N4007
R2G1
0
R2G1
0
P205A
5PIN3.96-AxxB
P205A
5PIN3.96-AxxB
1
2
3
4
5
+
C245
10uF
+
C245
10uF
CW
RV201B
1KA
CW
RV201B
1KA
6 4
5
R231
4.7K
R231
4.7K
R233
33K
R233
33K
R245
2.2K
R245
2.2K
R209
100
R209
100
RCA201A
2 HOLES
RCA201A
2 HOLES
1
3
R264
220
R264
220
Q201
2SC1815
Q201
2SC1815
D210
1N4148
D210
1N4148
D212
1N4148
D212
1N4148
+ C211
1uF
+ C211
1uF
+
C233
330uF
+
C233
330uF
IC205
HS1237
IC205
HS1237
1
2 3
4
5
6
7
8
D216
1N4148
D216
1N4148
R204
1K
R204
1K
C
201
10nF
C
201
10nF
C280
N.I.
C280
N.I.
C215
100nF
C215
100nF
~
~
+ -
BR204
DB104G
~
~
+ -
BR204
DB104G
+
C261
100uF
+
C261
100uF
R201
10K
R201
10K
+
-
+
-
L
R
Vcc Vss
GNDL GNDR
M201
HS OPAMP STEREO
+
-
+
-
L
R
Vcc Vss
GNDL GNDR
M201
HS OPAMP STEREO
9
8
7
10
6
1
5
2
3
4
R235
1K
R235
1K
R250
22
R250
22
+
C207
22000uF
+
C207
22000uF
RL201A
JQX-115F/036/1HS1
RL201A
JQX-115F/036/1HS1
3
4
HS204
70-004003-1
HS204
70-004003-1
TH201
BT151-500R
TH201
BT151-500R
3
1 2
~
~
+ -
BR203
DB104G
~
~
+ -
BR203
DB104G
Q202
2SA1015
Q202
2SA1015
R207
100
R207
100
C251
100nF
C251
100nF
+
C254
10uF
+
C254
10uF
D219
1N4148
D219
1N4148
+
C232
100uF
+
C232
100uF
R221
56K
R221
56K
+
C223
10uF
+
C223
10uF
+
C
229
1000uF
+
C
229
1000uF
R247
1meg
R247
1meg
D208
1N4148
D208
1N4148
~
~
+ -
BR202
KBU8D
~
~
+ -
BR202
KBU8D
C238
10nF C238
10nF
IC203
NJM317F
IC203
NJM317F
O
2
I
3
ADJ
1
+
C208
22000uF
+
C208
22000uF
C257
100nF
C257
100nF
IC202
LM337T
IC202
LM337T
O
3
I
2
ADJ
1
D
207
1N
4148
D
207
1N
4148
+
C224
10uF
+
C224
10uF
R259
100K R259
100K
HS201
70-004003-1
HS201
70-004003-1
C2
3
1
100nF
C2
3
1
100nF
C241
100nF
C241
100nF
J201
PHONEJACK
J201
PHONEJACK
1
2
3
4
5
C246
100nF
C246
100nF
C242
100nF
C242
100nF
P207B
11PIN2.54-C
P207B
11PIN2.54-C
1
2
3
4
5
6
7
8
9
10
11
R219
4.7K
R219
4.7K
PAD1
Solder Pad
PAD1
Solder Pad
Q203
MPSA92
Q203
MPSA92
D206
1N4148
D206
1N4148
+
C222
10uF
+
C222
10uF
R2
1
6
2.
67K
R2
1
6
2.
67K
R213
240
R213
240
R228
1K
R228
1K
+
C248
10uF
+
C248
10uF
D203
24V
D203
24V
C240
N.I.
C240
N.I.
- 8 -
SCHEMATICS DIAGRAM
01-37506-00