NAD C 725BEE Service Manual page 22

C725BEE AMP
+18V
R154 R101
10 39k,MF,5%
Q103
C13
C2240
10u/35V
C103
100uF/16V
R103
R19 82,MF,5%
39K,MF,5%
Q16
Q101
A1015
C2240
C11
Q14
R111
82,MF,5% C2240 C18
39p
10u/16V
RCA34D Q18
R11 R14
MAIN-IN R-CH Q12 R115
B647
A970 15
470 100
C17
R12
0.1uF/63V
220K
R116
Q47 Q48 Q13 15
A1015 C2240 Q19
C1815
D667
R15
22K
C12
Q15 C19
82,MF,5%
1nF NPO
R112 A970 39p
Q17
R418 R419 Q102 C1815
100 100 A970
+5V
+46V D410
R420
R485
4K7
33K Q104
R422
22V
A970
-18V
1.1K
R155 R105
Soft clipping
10 39k,MF,5%
C415 C14
Q427 10u/35V C16
10u/25V
R424
220uF/63V
Q426 C1815
OFF 1.1K
C1815
R484
1 4
8K2 2 5
3 6
R425
S41A S41B
ON 1.1K
-18V
C416
R423
10u/25V
1.1K
-46V D411 22V
R201
R421
39K,MF,5%
33K
Q203
C2240
C203
R416 R417
+18V 100uF/16V
R254
100 100
10
C23
10u/35V
Q26
Q201
C2240
Q46 Q45 Q24
R211 C28
C1815 A1015
C2240
82,MF,5% 39p
RCA34C Q28
MAIN-IN L-CH R21 R24 Q22 B647
R215
15
C27 A970
470 100
0.1uF/63V
R22
220K
C21
R216
10u/16V Q23
15
C2240
C29
R25 C22
39p
22K
1nF NPO Q25
A970
Q202
A970
R210
39k,MF,5%
C204
Q204
100uF/16V
SUBOUT 1
R255
A970
-18V
SUBOUT 2 10
R205
C24
39k,MF,5%
10u/35V
2PIN
CB46
2PIN
CZ46
JK41
N8C320D03
CZ45 CB45
HEADPHONE OUT R
1 3
2 2
3 1
HEADPHONE OUT L
PHONES SOCKET
R458 R459
100,FP ,5%,2W 100,FP ,5%,2W
C725BEE HEADPHONE BOARD Vc2.0
C725BEE POWER AMP CIR. R
R130
82/1W FS
R132 3K3/2W FP
R172
R162 D101
R119 1M2
1K 1N4148 R126 3K3/2W FP
82,MF,5%
R163
D13
1N4148 1K
D102 Q117
D15 2SA970
1N4148 Q119
1N4148
2SC2690
KSA1220
Q110
R121
C124 1nF D11
100K,MF,5% C110 4.7V
47u/25V
R123
R169 330
47K,5%,1/4 Q111 D12
Q118
KSC2690 C111 4.7V
2SC2240
D103 47u/25V
D16 1N4148
1N4148
R166
R164
5K6 10K
IC11
D14 AZ431
1N4148
R165 R129
R167
330/0.5W FP
R120 R168 10K
1K
82,MF,5% R133 3K3/2W FP
1K
R127 3K3/2W FP
R131
82/1W FS
R159 100,5%
L12 100uF
C229
POWER AMP CIR. L
N.I.
R230
82/1W FS R226
R262 D201 R272
R219 1K 1N4148 1M2
R232
82,MF,5%
R263
D23
1K
1N4148
A1015 Q219
D202
Q217
2SC2690
1N4148 2SA970
D25
R221 1N4148
100K,MF
Q210
KSA1220
C224 1nF C210
D21
4.7V
47u/25V
R223 R269 330
47K D22
C211
4.7V
Q218 47u/25V
D203
1N4148
Q29
D26
D667 2SC2240
1N4148 R266 R264
5K6 10K
Q27
C1815
D24 IC21
1N4148 AZ431
R220 R267 R265
R227 3K3/2W FP
R268 1K 10K
82,MF,5%
1K
R231
R233 3K3/2W FP
82/1W FS
R259 100,5%
L22 100uF
R453
220/2W FP
R452
220/2W FP
+46V
R142
C114
I/V For Over
0.1u 10% R12/1 C12/1
22,MF,5% Current
63V
6K8 10uF/25V
R107 Protection
Q12/1
D17 A1015
39,MF,5%
1N4148
R152
C112 22K
470p,100V,20%
R148
R136
R171
Q112 56K
820 10 FS R147
KSC2690 Q11
TP3
C1815
1K C118
0.1u 10% 63V
VR12 R144 R151
200 0.068/3W CE C120
22n 10% 10/1W FS
VR13
2K C119
22n 10% 63V
L11
0.5uH
R170 R138
R145
2.2K 430
R150
0.068/3W CE
R156 1/1W FP
R498
Q116 470K C121
1,1/4W
KSC2690 1uF,63V,5%
TP4
R160
R139
-18V
412
1K,5%
Q113
3
IC3A
R137 FS KSA1220 1
2
10
TL082D
C113
R108 R161
470p,100V,20% 39,MF,5%
+18V
1K,5%
C122
R143 1uF,63V,5%
R158
R157
22,MF,5% 2.2K
470K
-46V
+46V
C214
3K3/2W FP R242
0.1u 10% 63V
3K3/2W FP 22,MF,5%
R207
39,MF,5%
470p,100V,20%
R252
C212
22K
D27
1N4148
R236
Q212
R271
R248
KSC2690
820 10 FS 56K Q21
TP2 C1815
R247
1K
C218
VR22 R244
R251
0.1u 10% 63v
200 0.068/3W CE C220
VR23 22n 10% 10/1W FS
2K 63V
L21 0.5uH
R250
1/1W FP
C219
R270 R238
22n 10% 63V
2.2K 430
R245 R499
Q216 0.068/3W CE 1,1/4W
C221
R256
KSC2690 1uF,63V,5%
470K
R239 TP1
R260
412
-18V
1K,5%
Q213
5
IC4B
KSA1220
R237 7
6
10 FS TL082D
C213 R208 R261
470p,100V,20% 39,MF,5%
+18V
1K,5%
C222
R243 R257 1uF,63V,5% R258
470K 2.2k
22,MF,5%
-46V
C436
1nF
RL12/1
RL12/2
C435
1nF
PROTECTION CIR.
+18V +46V
Over Heat Protection:
IC44
It shut down the unit
R438 Protection Module
when the temperature on
22K
the heatsink is over 90C
degree
R12/2
It alos shut down the unit
22K
when the unit enter the
standby mode
Q412
C1815
C432
C422
C421
R439
330u/16V 0.22u
T0=90 degree C 0.47uF/50V
POSISTOR
R445
C420
100u/16V
56K
R446
56K
+18V +18V
R474
ISC CIRCUIT
1K
R471 R470
ISC Circuit: 10K 10K
It switch the power
R483 R472 C430 D418 D417 C425
supply to lower voltage
C429
when the load impedance 270K 470K 10u/25V 1N4148 1N4148 10u/25V
10u/25V
is low, or the temperature
on the heatsink is over
R477 R478
80C degree 6 2
7 1
47K 100K
5 3
R479
IC43B
TL082D IC43A
100K
TL082D
R473
C426 C428
43K R476
10u/25V 10u/25V
1K C431
10u/25V
-18V
R491 R488
D420
100K 18K
R490 R487
1N4148
D419
100K 18K
1N4148
SUPPLY CIR.
+18V Q41
2SC2690
C47
D49 47u/50V
18V
R411 R49
R414 C45
2K2
22p
680 680
MF
C411 C49
47u/35V
0.1uF/63V
R413
680 R401
10K
R410
680
C46
R412
2K MF C48
C412 C410
0.1u 10% 63V 47u/35V 10u/25V 22p
-18V
Q42
2SA1220
D412 +37V
L OUT
1N4148
R OUT
Binding Posts A
L OUT
+37V
D413 R OUT
1N4148
Binding Posts B
R454 R455
510 510
+18V
Q416
Q417
C1815
C1815 Name
C725BEE Main Board.SCH
R493 R449 R494 R450
R440
10k 10K 10k 10K
2K2
SPK B
Unit Protect
SPK A
Soft clipping Soft clipping
+18V
-18V
+18V
+12V
R482 R469 R468 +5V
4K7 10K 22K
D428
-46V
1N4148
Q421
C1815
R480
5K1
R467
T0=80 degree C
POSISTOR
Mount on the heatsink
R497
180k
VR3
10K CB47
ISC TRIG
1
+18V I-V
2
AC DET.
3
+37V
R45 +12V 4
+37V
5
-37V
33/1W FS
6
7
R41
C413 680
To Power board
220u/63V
R496
R43
75/2W FP
R47 680
680
C43
Q43 220u/50V
C1815
+46V -46V
CB49
Q44 C44
1
A1015 220u/50V
2
3
R48 R44
4
680 680
To Power board
C414 R42
680
220u/63V
-37V
R46
33 / 1W FS