AMPLIFIER

STEREO

C 320BEE SERVICE MANUAL

NAD

C 320BEE

AMPLIFIER

STEREO

+12V
Protection
Remote Mute
Soft Ind
Pre Mute
+5.6V
+18V
-18V
Standby

20V

+46V D410

36K

R420

1S41A S41B 4
2
5
3
6

470

R21

R416
100

C416
10u/25V

R417
100

C11
10u/16V

C21
10u/16V

C27
0.1uF/63V

Q45
A1015

R419
Q48
100
C1815

C415
10u/25V

Q46
C1815

R421
36K

R423
1.3K

R425
1.3K

R424
1.3K

R422
1.3K

R418
100

Q47
A1015

-18V
STANDBY

+18V

C434
22n/63V

100K

R448

+5.6V
+18V

+12V

R451
330K

Q411
A1015

R489
100K

Q15
A970

-18V

-46V

R436
56K

D423
1N4148

R25
22K

100

R24

C22
470p

-37V

R41
680

+37V

10

R255

C23
10u/35V

680

680

Q42
2SB649A

22p

C46

680

R410

R49
680

C47
47u/25V

STANDBY

22p

C45

NAD C320 SUPPLY CIR.

R42
C414
680
220u/35V
R46
33 / 0.5W FS

R48

Q44
A1015

Q43
C1815

680

R47

R411
680

R220
82
MF

Q27
C1815

Q29
D667

Q28
B647

Q26
A1015

47

R219

R413
680

D49
18V

D26
1N4148

Q211
D669

Q210
B649

MF

R412
2K

R414
2K2
MF

R231
82/1W FS

D24
1N4148

R222
100K

47K

C48
10u/25V

D403
1N4148

R221
100K

D25
1N4148

82/1W FS

R230

82/1W

D23
1N4148

R223

D16
1N4148

R131 FS

R122
100K

47K

R123

100K

R121

D13
1N4148

FS

D15
1N4148

82/1W

VR11
100

D14
R120 1N4148
82
MF

Q17
C1815

Q19
D667

Q18
B647

Q16
A1015

47

R119

R401
4K7

VR21
100

C29
22p

C26
220uF/63V

Q204
A970

R206
82

C28
22p

MF
R203
82

Q203
C2240

C25
220uF/63V

C16
220uF/63V

Q104
A970

R106
82

C19
22p

C18
22p

R103
82

Q41
2SD669A

R204
220k

R205
39k

Q202
A970

Q25
A970

33

33
R216

Q24
C2240
R215

Q201
C2240

R44

C44
220u/50V

C43
220u/50V

680

R43

33/0.5W FS
R45
C413
220u/35V

C24
10u/35V

C204
100uF/16V

R210
39k

R212
82

Q23
C2240

Q22
A970

R211
82

R29
39k

R202
220k

39K

C203
100uF/16V

39k

10

R104
220k

R105

Q102
A970

R155

C14
10u/35V

C104
100uF/16V

R110
39k

R112
82

33

33
R116

R201

-18V

C12
470p

Q13
C2240

Q12
A970

Q14
C2240
R115

10

R15
22K

100

R14

R111
82

+18V
R254

R435
100K

R457
220K

NAD C320BEE POWER AMP CIR.

R22
220K

MAIN-IN L-CH

20V

-46V D411

OFF

470

R11

R12
220K

C17
0.1uF/63V

Q101
C2240

R102
220k

Q103
C2240

330/0.5W FP

Q111
D669

C410
47u/25V

C412
0.1u 10%
63V

C49
C411
47u/25V 0.1u 10%
63V

R429
5K1

R428
2K2

Q414
C1815

-18V

Q413
D669

1K

15K
R147

R148

C114
0.1u 10%
63V
Q114
2SA1943

Q421
C1815

R469
10K

+18V

R468
22K

Q213
B649
Q215
2SC5200

R245
0.068/3W CE

C220
22n 10%
63V

1K

15K
R247

R12/1
6K8

D17
1N4148

1N4148
R248

Q214
2SA1943
D27

R244
0.068/3W CE

Q212
D669

Q113
B649Q115
2SC5200

R145
0.068/3W CE

R144
C120
0.068/3W CE 22n 10%
63V

Q112
D669

R467
T0=80 degree C

+12V

22

39
R243

R208

TP1

TP2

C212
470p

R427
22/1W FP

+37V

2K7/2W FP

R227

R239
470

R238
390

VR22
300

C213
470p

FS

Q216
KSC2690

D22
4.7V

D21
4.7V

10

22
R207

39

R242

22

39
R143

R108

2K7/2W

FS
R236

C113
470p

TP4

TP3

39

22
R107

R142

R226 FP

R237
10

+18V

C211
47u/25V

R127

2K7/2WFP

10

R139
470

R138
390

VR12
300

10 FS

C112
470p
R136

Q116
KSC2690

D12
4.7V

D11
4.7V

R137 FS

C111
47u/25V

C210
47u/25V

C110
Q110 47u/25V
B649

R126

2K7/2W FP

+46V

1uH

D428
1N4148

C215
0.1u 10%
63V

-46V

C217
0.1u 10% 63V

C218
0.1u 10%
63V

R251
10/1W FS

R250
1/1W FP

L21

Q21
C1815

R252
22K

C214
0.1u 10%
63V

2SC5200
2SA1943

7
6
5
4
3
2
1

CZ46

1
2
3
4

CZ48

-46V
+46V
GND
GND

R433
2M2

2SB649
2SD669

ECB

TEXT

RL12/1
F1AA012V

1N4148

D412

C426
10u/25V

R473
47K

47K

R477

C429
10u/25V

+18V

-18V

0V

0V

+2.16V

C430
10u/25V

56K

R446

2SA970
2SC2240
2SA1015
2SC1815

56K

R441

C436
100uF

Q418
C1815

D432
TIC116D

R471
10K

V-

+IN A 3

-IN A

1N4148

TL082D

39K

D420

R488

100K

39K

R487

R491

100K

R470
10K

D417
1N4148

C428
10u/25V

+IN B

-IN B

R486
560K

LM7805

+18V

R480
6K2

L OUT
R OUT

K A G

TIC116D

5.6V

+46V -46V

+37V -37V

D401
DB104

R453
220/2W FP

IN GND OUT

100K

100K
R479

R478

R482
4K7

D426
1N4002

D427
1N4002

R452
220/2W FP

D425
1N4002

1
2
3
4

1
2
3

1
2
3

7
6
5
4
3
2
1

RED
VIO
BLK
ORG
GRY

JK41
PHONES SOCKET

SPKOUT

SPKOUT

BINDING POSTS

SW42

N8C320D03

CON7 CON7

7
6
5
4
3
2
1

CB41 CZ41

CON3 CON3

1
2
3

CB42 CZ42

CON3 CON3

1
2
3

T401

C435
4n7/400V

POWER SWITCH

AC POWER CORD

3
2
1

CB411 CZ411

1
2
3

CB410 CZ411

C4 10n

1 2 3 4 5 6 7 8

5PIN

1
2
3
4
5
6
7

CB47

4PIN

UPC1237

CZ44

5PIN

CB49

1
2
3
4
5

F45
500mA/250V

6.3A/250V X3

F44

F41

F42

F43

1
2
3
4
5

CB45

H2

L2

L1

H1

NAD C320 RECTIFIERS CIR.

C42
C41
10n/250V 10n/250V
10%
10%
!
!

22K

R444

D424
1N4002

C433
2200uF

1N4002

D413

C425
10u/25V

C424
2200u/50V

OUT B

V+

D419
1N4148

IC43A
TL082D

D41
KBU8D

C423
3300u/50V

R440
2K2

+18V

C320BEE ISC CIRCUIT

PROTECTION CIR.

IC41
LM7805

D45
KBU8D

R443
150 1/2W FS

+46V

1N4148

C421
4u7/50V

+2.0V

D429

1K

1K
R459

R460

C418
15000uF/50V 10%

IC44
UPC1237HA
6

C432
0.22u

OUT A

R445

R458
1K

R463
22K

C417
15000uF/50V 10%

Q417
A1015

15K
R442
56K
C420
100u/16V

22K
Q420
C1815

R464

R465
100

R461
100

7
D418
IC43B
1N4148
TL082D
C431
10u/25V
R490

E C B

TEXT

R476
1K

0V

R474 1K

R472
470K

+18V

C422
330u/16V

0V

22K

R12/2

O/P RELAY

Q412
C1815

R466
4K7

Q419
A1015

D431
TIC116D

R462
1K

+3.25V

R434
2K2

Q49
A1015

Q410
A1015

R432
220

R431
0.05/3W 5% CE

330K

R483

R439
T0=90 degree C
POSISTOR

D42
1N4148

D43
1N4148

R437
47K

C5
10n
TO CHASSIS

TRIG
AC DET.
I-V
+37V
-37V

STANDBY

R438
22K

+18V

TEXT

Q12/1
A1015

C219
22n 10%
63V

C115
0.1u 10% 63V

-46V

C117
0.1u 10% 63V

C119
22n 10% 63V

C118
0.1u 10% 63V

R151
10/1W FS

1/1W

R150 FP

L11 1uH

Q11
C1815

R152
22K

C12/1
47uF/25V

+46V

Pre
lim
ina
ry

MAIN-IN R-CH

R19
39K

C103
100uF/16V

39k

C13
10u/35V

R130

R128

R124

10

C15
220uF/63V

R146
2K7/1W 1% MF

2200u/6.3V

3.3/0.5W FP

3.3/0.5W FP

330/0.5W FP

330/0.5W FP

R125

R129

R228

R224

R225

R229

R153
1K2/2W 5% FP

R253
1K2/2W 5% FP

C116

R246
2K7/1W 1% MF

2200u/6.3V

C216

3.3/0.5W FP

3.3/0.5W FP

330/0.5W FP

R149
150/1/4W 1% MF

R249
150 1/4 1% MF

R101

+18V
R154

ON

C320BEE INPUT SELECT CIRCUIT ON THE MAIN BOARD

1M
R37

C329
0.1u 5%
63V
C37
100p

SW31A
RL36A

ON

D37
D38
1N4148 1N4148

C1
10n

1M
R34

D312
1N4148

D313
1N4148

R2
10

RL35C

RL36CRL37C

RL38C

AUX

TUNER

TAP2

TAP1

R58
10K

R511
10K
VOLUME CONROL
MOTOR

Q55
A1015

C55
4u7/25V

R59
1K

C324
47u/25

C56
4u7/25V

R493
0
Q57
A1015

R512
1K

R510
1K

R513
1K

Q58
C1815

RL34B

+5.6V
+18V
-18V

C326
47u/25

C38
100p

R320
N.I.

C312
100p

C328
22n 5%
63V
R324
750 MF

RL37B

C314
100p

C316
100p

R330
1K5 MF

C330
0.1u 5%
63V
RL38B

RT33B

C332
0.22u 5%
63V

RT32B
10KA

C334
0.97u 5%
63V

R332
390 MF

R328
180 MF
R346
220K
MF

OFF
SW31B

1M
R318

ON

4
5
6

D32
10M

BY MOTOR

20KB

BALANCE POT

RL36B

R322
3K3 MF

VOLUME POT

C310
100p

C340

C342

1u/16
C338

47u/25

RT34B
0.1U
20K MN

C346
0.1U

C344
220p
R336

R PRE-OUT
Q32
K363

68

R348
100K

R334
4.7K

C336
470P
R3 100

TONE DEFEAT SW

C318
100p

C6
10n

MAIN POT
ALPS RK16812MG
2SK369

D G S

Protection
Remote Mute
Soft Ind
Pre Mute
+5.6V
+18V
-18V
Standby

R326
390 MF
C322
0.1U

BASS POT

RL35B

10
9
8
7
6
5
4
3
2
1

CB34
TO CZ51

C302
220p

C36
100p

CB31
TO CZ52

TAP1
8
REMOTE MUTE
7
STANDBY
6
PROTECTION
5
4
+5V
3
VOL2
VOL+
1

RL32B

Q56
C1815

C3
0.1uF

IRIN
IROUT
SOFT IND.
+12V
DISC
CD
VIDEO
AUX
TUNER
TAP2

+5.6V

-18V

C320
0.1u 10% 63V

R-CH INPUTS

PHONE1A

1K

RL34C

J117

1M
R314

470

D310 +12V D311

C301
10uF/50V

RL33B

1M
R312

1M
R316

QI1
2SC1815

RL33C

-18V

1M
R310

470
R343
REC1

+18V
CB33
1
2
3
4
5
6
7
8
9

RL32C

C34
100p

1M
R38

470
R342
TAPE1

63V

RL31C

LOW NOISE AMP MODULE

CB32

1
2
3
4
5
6
7
8
9

C32
100p

D39
1N4148

CD

C319
0.1u 10%

LOW NOISE AMP MODULE

REC2

IR OUT

RI1

VIDEO

C323
47u/25

R32

470
R341

33

+18V

R345
220K
MF

C317
100p

1M
VIDEO
R36

TAPE2

PHONE1B

RI3
+5V

+12V Trigger

RL31B

470
R358

C337
0.1U

PHONE2

R1
100

TUNER

QI2
2SA1015

1K

+12V

5K1 MF

470

470
R356

+5V
RI2

RT34A
20K MN

DISC

C315
100p

1M
REC1 R317

AUX

C339
1u/16

TONE DEFEAT SW

RL38A

470
R339

470
R354

D31
10M

C313
100p

1M
R315

470
R352

R347
100K

C343
220p

RL37A

470
R338

CD

R333
4.7K

C311
100p

1M
R313

470
R350

L PRE-OUT

68

IR IN

470
R337

DISC

Q31
K363

R335

BY MOTOR

C333
0.97u 5%
63V

C335
470P

1
2
3

C345
0.1U

20KB

R331
390 MF

OFF

C39
100p

1M
R311

RT32A
10KA

R327
180 MF

RL35A

1M
R39

TO CHASSIS
P8

C331
0.22u 5%
63V

R360

L-CH INPUTS

R323
750 MF
RL34A

470
R357

TAPE1

C327
22n 5%
63V

C35
100p

470
R355

REC2

R319
N.I.

R329
1K5 MF

RT33A

BALANCE POT

470
R353

TAPE2

R321
3K3 MF

RL33A

1M
VIDEO
R35

TUNER

C321
0.1U

VOLUME POT

C33
100p

47u/25

R325
390 MF

RT31A
10KA
TREBLE POT

470
R351

AUX

47u/25
RL32A

1M
R33

C341

C320BEE TONE CONTROL CIRCUIT

R359

CD

C325

C31
100p

BASS POT

470
R349

5K1 MF

RL31A
R31

RT31B
10KA TREBLE POT

DISC

PRE-AMP MODULE

1 2 3 4 5 6 7 8

1 2 3 4 5 6 7 8 9

1:
2:
3:
4:
5:
6:
7:
8:
9:

+18V
LOUT
LINLIN+
GND
RIN+
RINROUT
-18V

TO THE CHASSIS

1
2
3
4
5
6
7
8
9

+18V
LOUT
LINLIN+
GND
RIN+
RINROUT
-18V

J61

R621
120

R52
470

R501
2K2

C68

15K

C611
40P LINEIN MODULE
15P LINEOUT MOULE

R62
220

C62
220p

0.1u 20%

Q53
C1815

D515
1N4148

R530

W53

CB53

CZ43

LD42
513AW

R64
1M

C1815

+12V Q54

R51
680
+5V

C320BEE PREAMP MODULE

C1815

Q52

W256

POWER/PROTECTION IND.
N8C320F06
RED
GREEN

SHIELDING

21

D513
1N4148

Q62
2SK369

R68
1K

D64

C67
0.1u 20%

1N4148

R66
560 2%

+5V

C59
22p

C57
10n

+5V

C511
0.1u 20%

IC55
4094

C64
15p

D512
1N4148 +5V

1N4148

1N4148
D511

+5V D510

C610 R610
D63
430 2%
100p
1N4148

R53
10K

C51
100u/16V

1
2
3
4

12MHz

Y51

NC Vcc
NC
NC
NC SCL
Vss SDA

IC51
24C01

5K1

R533

10K

R614

R612
1K

Q65
A970

Q516
C1815

Q66
B647

R618
10

R616 R620
33
10

Q68
D667

IC54
4094

C510
22p

8
7
6
5

C52
0.1uF

+5V

R63
1M

220

220p
R61

C61

C69
100p

MUTING BLINK

C66
0.1u 20%

1
2
3
4
5
6
7
8
9

C63
15p

1N4148

D62

C65
R613
0.1u 20% 10K

R65
560 2%

D61
R69
430 2%1N4148

Q61
2SK369

R67
1K

P24
P25
P26
P27
VCC
X2
X1
P31
P32

IC53

MICOM

C58

P23
P22
P21
P20
GND
P02
P01
P00
P33

R548

R611
1K

R615
33

Q67
D667

Q64
B647

4K7

D59
6V8

R551

AUX

T2

R552

Q512
C1815

4K7

R544
4K7

C517
10n

D52
AUX
GREEN

E C B

TEXT

PORT3/2

PORT3/1

XTAL1

XTAL2

VCC

PORT2/7

PORT2/6

PORT2/5

PORT2/4

TEXT:
2SA1015
2SC1815
2SB647
2SD667

PORT3/3

PORT0/0

PORT0/1

PORT0/2

GND

PORT2/0

PORT2/1

PORT2/2

PORT2/3

IC53: Z86C0812PSC

4K7

AU

Q511
C1815

D56
TUNER
GREEN

R529
10K

4K7

R553

Q513
C1815

D G S

T1

R554

Q514
C1815

Q515
C1815

D55
TAPE1
AMBER

1 2 3

GND

Q4

Q3

Q2

Q1

CLK

STR

OE

QS

QS

Q7

Q8

Q6

Q5

+12V +5V

R426
910

LD41
GREEN

SDA

SCL

NC

VCC

1: RED INDICATOR
2: COMMON CATHODE
3: GREEN INDICATOR

513AW

GND

NC

NC

NC

1
2
3
4
5
6
7
8

TO CB34
CZ51

1
2
3
4
5
6
7
8
9
10

TO CB31
CZ52

IC51: 24C01

PROTECTION
GND
VCC
VOLVOL+

TAP1
REMOTE MUTE

TAP2
TUNER
AUX
VIDEO
CD
DISC
+12V
SOFT IND.
IR OUT
IR IN

C552
0.1uFTO THE CHASIS

R516
10

VCC

1: SIGNAL
2: GND
3: VCC

IS1U60L

R515
10

C550
C551
0.1uFTO THE CHASIS0.1uF TO THE CHASIS

R514
10

SOFT CLPPING IND.

IC54 IC55: CD4094

R547
4K7

C520
10n

TAP1

D57
DISC
GREEN

R526
2K2

+12V

R503
470

+5V

Q517
2SC1815

R502
10K

4K7

R546
4K7

C519
10n

DISC

D54
TAPE2
GREEN

Q51
A1015 R527
2K2

2SK369

10

11

12

13

14

15

16

17

18

DI

R545
4K7

C518
10n

TAP2

R528
4K7

D514
1N4148

VIDEO
S51

TAPE2
S54

+12V

AUX
S52

CD
S53

TAPE1
S55

TUNER
S56

R543
4K7

C516
10n

TUNER

R550

Q510
C1815

4K7

TU

R542
4K7

C515
10n

D51
VIDEO
GREEN

R556
10K

DISC
S57

VIDEO

D53
CD
GREEN

R557
10K

C514
10n
Q59
C1815
R541
4K7
R549
VI

CD

R617 R619
10
10

4K7

Q63
A970

C512
0.1u 20%

R558
10K
+5V

18
17 P22
16 P21
15 P20
14
13 P02
12 P01
11 P00
10

0.1u 20%

Z86C0812PSC
C8
220p BACKUP N.I.

R508
10K

+5V

Pre
lim
ina
ry

V VCC

IC52
IS1U60L

PROTECTION

P9

IR OUT
IR IN

IR RECEIVER
N8C320F08

REMOTE MUTE

TO CHASSIS

QS
QS

10
9

15
3
2
1

OE
CLK
D
STR

Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1

11
12
13
14
7
6
5
4

VOL+
VOL-

QS
QS

10
9

15
3
2
1

W91

SOFT IND.

OE
CLK
D
STR

Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1

11
12
13
14
7
6
5
4

DI
T1
T2
AU
TU
VI
C

NOTE: R514 R515 R516 AND C550 C551 C552

+12V

NAD C 320BEE KEY BOARD

VCC