NAD T 975 C/AH, Service Manual, Page: 17 / 40

P202A P201A
NAD 2006/05/18
F203&F204 IS T1.25AL/250V
C210
F203
T975 SEVEN CHANNEL AMPLIFIER
Q207
PROT5 C257 C256
R2A3
P205B
SEN
5
R2
A
2
C275
PSU BOARD - SOLDER SIDE
HS214
D
224
G2G1 AC
IN
GN
D
CURRE
NT
AC
O
U
T
BR208
+5
V
D
RE
L
A
Y
~ ~
C255
C227
C228
IC
206
C
280
R2
E
9
R
215
C281
R
214
C
262
R213
R
216
b
C
230
Q
208
Q234
e
R212
D
201
6
R
251
P207A
R
252 C258
R
253
Q228
b
1
C282
R2
F
6
-
Q227
b
D230
R254 e
STBYLED
+5VD
DGND
PROT6
SCLED
PROT7
e
R2
F
2
IC205
R2
F
5
+
R2
F
4
D
231
D
223
R2
F
3
R2
F
1
C
220
C
219
C
216
R
208
R
206
R
202
R
204
b
Q
204
C
218
C
217
C
215
R
207
HS204
e
Q202
R
205
R
203
R
201
b
e
Q
203
C
236
Q242
Q235
Q206
HS206
D
235
R219 C231 R220
D
233
R2
H4
C238
D204
C239 C237
C232
b
Q209 b
e e
C234 R225 R223
be
R250
C233
C284
D236
R222
R2H3
D234
R224
b
R218
e
D203
b
Q241 R221
e
D202
Q205
HS205
R
217
C229 C226
R211
D2
0
5
R227 C235 R226
C283 R2H2
D237
IS
CTRIG
_
1
IS
CTRIG
_
2
IS
CTRIG
_
3
IS
CTRIG
_
4
IS
CTRIG
_
5
IS
CTRIG
_
6
IS
CTRIG
_
7
BUS202
Q
226
UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE
REPLACE ONLY WITH SAME TYPE FUSE AND RATING
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE
VM1.0 2006/05/18
and should be resumed after
during the test for 8ohms load
T975 PS BOARD
The two links should be shorted
C
261
R
275
Q220
HS213
HS202
IC202
HS201
IC201
HS212
Q219
C
274
R
278
R
267
R
279
D2
1
1
R2
8
3
D208
C
277
W
201
W2
0
2
D209
C278
BUS205
R2
9
7
b
C2
0
9
Q
225
C
208
R2
9
8
CAUTION:
ATTENTION:
b
R2A9
D
213
D222
C2
0
7
R2
5
9
b
Q
222
R2
6
0
C
206
R2
8
1
b
Q
232
R2
5
8
HS203
Q201
BUS206
BUS204
C205
C204
b
BUS201
- ~
+ ~
BR201
b
C201
C203
C202
T975POW VM1.0
AGN
D
FA
N1
J202
FA
N2
FA
N3
-68V + 68V AC
OF
F
+ 18V
P203B
-18V DG
ND
R
257
e
Q
230
R
256
R
255
R
231
e R
230
Q
229
e
DG
ND
b
R
299
e Q
221
R
210
eb
R
280
e Q
231
R
209
b
e
R
294
e Q
223
eb
Q
224
R
295
e
J201
the test.
Q218
F
O
R
CO
NT
INUE
D
P
RO
T
E
CT
IO
N
A
G
A
INS
T
RI
S
K
O
F
F
IRE
R
EPL
AC
E
O
N
L
Y
W
IT
H
SAM
E
T
YPE
F
U
SE
AN
D
R
AT
IN
G
U
T
IL
ISER
U
N
F
U
SI
BL
E
D
E
R
EC
H
AN
G
E
D
E
M
EM
E
T
YPE
D
220
R261
D
229
PROT4
PROT3
PROT2
PROT1
+12VD
P206B
A
TTE
N
TIO
N
:
CA
UT
IO
N:
D2
0
7
D
210
R2
7
6
HS211
R2
8
2
R2
7
7
R
270
R2
6
3
C276 C273 R273
R2
A
1
R2
A
4
C271
C
259
R2
E
6
R2A7
D225 R2E1D221
R2
6
4
R
265
R
266
R
274
IC203
TL084
R2A5
R
271
C260
C272
R2
A
8
R2
E
3
R2
E
8
D2
1
6
D
217
be
R2
E
4
D226
Q
233
R2
E
7
R2
F
7
D218
R
287
D
219
R2E5
R
288
R
289
R2E2 C264 R269
R2A6
R
290
R268
D
215
R272
D
214
IC204
74HC21
R
296
Q
240
D
227
R262
D
228
be
PSU BOARD - COMPONENT SIDE
D232
ST
BY
ST
BY
+8
V
+8
V
PR
OT
4
PR
OT
3
P204B
PR
OT
6
PR
OT
5
PR
OT
2
DG
ND
PR
OT
1
PR
OT
7
DG
ND
SC
LED
AGN
D
SC
LED
R
291
C279 R2
F
8 D212
R
292
J203
RV201
R
285
R
286
R
284
SEN
1
R293
SEN
2
SEN
7
SEN
3
GN
D
TP
1
SEN
6
SEN
4
AGN
D
C291
C254
C225 C214
C248
W204
C223
Q213
R
233
C211 C212 R235
C213
C222
C224
W203
b
Q210
e C245
b
Q212
R238
e
R232
b
C247
R234
Q211
e
R239 b
R240
e
C243
C240
Q
236
J204
R236
R
237
C
246
H
S
208
B
R
205
C244
Q
237
+
~
BR202
-
~
+
~
BR203
-
~
C221
Q217
R
242
Q214 b
Q216 b
R247
e
C253
R241
b
e b
R
245
R249
Q215
e
e
R243
C252
C250
Q
239
B
R
206
H
S
210
B
R
207
R244
C249
H
S
207
B
R
204
C251
R
248
R246
Q238
H
S
209
P208B
C242 F201&F202 IS T1AL/250V
F204
BUS203
F201
P209B
F202
R228
R229
D206
C241
Fan Cut Off Adjustment
- 17 -
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