NAD C521i, Service Manual

19

20

VC

1

VCC

2

E

3

D

4

A

5

B

6

C

7

F

8

GND

9

LD

10

VR

11

PD

12

FCS+

13

TRK+

14

TRK-

15

FCS-

16

M102

16PIN

LD

1

PD

2

EQ_IN

3

AC_SUM

4

GND

5

A

6

B

7

C

8

D

9

E

10

F

11

SW

12

DVCC

13

DVC

14

RFAC

15

FE

16

FEI

17

TE

18

TE_BAL

19

CE

20

CEI

21

VCC

22

RFG

23

BST

24

VFC

25

RFC

26

VC

27

RFDCO

28

RFDCI

29

DC_OFST

30

U101

CXA2581

1

2

3

Q101

8550

R101

10

R102

0

R103

2

0

K

R104

2

0

K

R105

3K

R106

150K

R107

100K

R108

68K

R109

1

5

K

R110

3

K

R111

4

K

7

R112

5

K

1

R113

5K1

R114

5K1

R115

1K8

R116

1

2

K

R117

1

2

K

R118

10K

R119

1

5

K

C101

0.1u

C102

0.1u

C103

0.1u

C105

100u/16V

C106

100u/16V

C107

100u/16V

C108

100u/16V

C109

100u/16V

VDD1

VC

VDD1

C110

100u/10V

VDD1

FE

TE

SE

SE

TE

FE

RFAC

RW/ROM/LDOFF

RFDC

FCS-

TRK-

TRK+

FCS+

FCS-

FCS+

TRK+

TRK-

V3V6

RFDC

RFAC

RW/ROM/LDOFF

1

2

3

Q103

8050

1/2X

1/2X

1

2

3

4

5

M101

5PIN

1

2

3

Q104

8550

1

2

3

Q105

8550

1

2

3

Q106

8050

1

2

3

Q107

8050

R121

1K

R122

1K

R123

1K

R124

1K

VCC

LOAD

UNLD

TRAY-

TRAY+

DI/SW

DISCO

DISCO

DI/SW

LOAD

UNLD

DI/SW

DISCO

L102

10uH

L101

10uH

R315

4R7

C111

2.2uF/6.3V

J127

RF AMP

LRCK

PCMD

BCK

CLKO

A

16.9344MHz

C328

20p

C329

20p

DGND

DGND

C320

10u/6.3V

AGND

C332

10u/6.3V

C376

22u/25V

C378

224K

R356

3K3

R360

6K8

C353

330p

R364

1K5

R368

2K2

R372

2K2

C357

2700p(M)

C363

4700p(M)

C367

680p(P)

C369

22u/25V 

C382

224K(M)

R376

150R

R374

100K

R380

150R

1

2

M317A

L

Q302

2SD655F

Q304

2SD655F

C321

10u/6.3V

R320

470R

EMPH

C323

10u/6.3V

C322

104K

A+5V

D+5V

2

3

1

U306A

5532

6

5

7

U306B

5532

8

4

U305C

5532

DGND

R378

4K7

R382

4K7

R414

100K

A-12V

C375

22u/25V

C377

224K

R355

3K3

R359

6K8

C352

330p

R363

1K5

R367

2K2

R371

2K2

C356

2700p

C362

4700p

C366

680p

C368

22u/25V

C379

224K(M)

R375

150R

R373

100K

R379

150R

3

2

M317B

R

Q301

2SD655F

Q303

2SD655F

2

3

1

U305A

5532

6

5

7

U305B

OPA2604

8

4

U306C

5532

R377

4K7

R381

4K7

MUTE

C536

103K

CHASIS

1

2

M318

DIGITAL OU

T

R384

75R

C387

103K

6

9

4

2

L301

CHASIS

R383

150R

C385

2200p

Vin

GND

Vout

1

2

3

M303

DST310

C386

104K

J528

C383

22u/10V

C384

1000p

1

2

3

U403A

74HC00

4

5

6

U403B

74HC00

DIG_OUT

DGND

12

13

11

U403D

74HC00

9

10

8

U403C

74HC00

14

7

U403E

74HC00

C380

104K

C381

104K

C371

470u/16V

C372

470u/16V

R391

220R 1/2W

R390

220R 1/2W

C374

470u/16V

C373

470u/16V

R393

220R 1/2W

R392

220R 1/2W

A+12V

A-12V

C417

104K

C418

10u/25V

D+5V

C370

103K

C333

104K

AGND

A+5V

A+5V

C325

10u/6.3V

C326

104K

D+5V

DGND

DGND

LRCIN

DIN

BCKIN

CLKO

XTI

XTO

DGND

VDD

VCC2R

AGND2R

EXT1R

EXT2R

VOUTR

AGND1

VCC1

VOUTL

EXT2L

EXT1L

AGND2L

VCC2L

VDD

DGND

CKSL

MODE

MUTE

MD/DM1

MC/DM2

ML/DSD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

U302

PCM1710U

R385

10R

AGND

AGND

AGND

AGND

C324

10u/6.3V

C327

104K

A+12V

A-12V

AGND

AGND

M302

C391

470u/16V

C390

470u/16V

AMP

NOTE:

1. RESIST

ORS, 

ARE CARBON FILM 5% 1/8W UNLESS

OTHER

WISE SPECIFIED.

2. CERAMIC CAP

ACIT

ORS, 

ARE 50V 10%. UNLESS

OTHER

WISE SPECIFIED.

NOTE:

1. RESIST

ORS, 

ARE CARBON FILM 5% 1/8W UNLESS

OTHER

WISE SPECIFIED.

2. CERAMIC CAP

ACIT

ORS, 

ARE 50V 10%. UNLESS

OTHER

WISE SPECIFIED.