NAD C521i, Service Manual

18

17

MCU

P67/AN7

1

P66/AN6

2

P65/AN5

3

P64/AN4

4

P63/AN3

5

P62/AN2

6

P61/AN1

7

P60/AN0

8

P57/ADT

9

P56/TOUT

10

P55/CNTR1

11

P54/CNTR0

12

P53/RTP1

13

P52/RTP0

14

P51/INT3

15

P50/INT2

16

P47/SRDDY

17

P46/SCLK

18

P45/TXD

19

P44/RXD

20

P43/I1

21

P42/INT0

22

P41

23

P40

24

/RESET

25

P71/XCIN

26

P70/XOUT

27

XIN

28

XOUT

29

VSS

30

P27

31

P26

32

P25

33

P24

34

P23

35

P22

36

P21

37

P20

38

P17/S31

39

P16/30

40

P15/29

41

P14/S28

42

P13/S27

43

P12/S26

44

P11/S25

45

P10/S24

46

P07/S23

47

P06/S22

48

P05/S21

49

P04/S20

50

P03/S19

51

P02/S18

52

P01/S17

53

P00/S16

54

P37/S15

55

P36/S14

56

P35/S13

57

P34/S12

58

S11

59

S10

60

S9

61

S8

62

S7

63

S6

64

S5

65

S4

66

S3

67

S2

68

S1

69

S0

70

VCC

71

VREF

72

AVSS

73

COM3

74

COM2

75

COM1

76

COM0

77

VL3

78

VL2

79

VL1

80

U401
M38223E

COM0
COM1
COM2

COM3

SEG0
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9

SEG10

SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19

M505AB
LCD

L302

10uH

VCC

R314

22K

R313

22K

R312

22K

R311

1K

VCC

R308

3K

R309

3K

X301A

8.00M

UNLD
LOAD
XRST

XLAT

CLOK

DATA

SCOR

SYSM

RW/ROM/LDOFF

RW/ROM/LDOFF

SCLK

SQCK

1/2X

DISCO

DI/SW

R327

4K7

R326

4K7

R325

4K7

R323

4K7

R322

4K7

R321

4K7

SQSO

SENS

C301

33p

C302

33p

C303
0.01u

1

2

3

Q308

8050

R329

4K7

R328

4K7

D303

IN4148

R338

10K

R339

100K

C308
10u/6.3V

VCC

C307
47uF/10V

VCC

DAT

GND

2

VCC

3

M113

IR

R340
10R

C309
47uF/10V

VCC

1

2

3

4

KEY302

OPEN/CLOSE

1

2

3

4

KEY307

PREV

1

2

3

4

KEY305
NEXT

1

2

3

4

KEY309
F.SCAN

1

2

3

4

KEY308
REPEAT

1

2

3

4

KEY306
TIME

1

2

3

4

KEY304
RANDOM

1

2

3

4

KEY303
STOP

1

2

3

4

KEY301
PLAY

R303 6K2

R302 6K2

R305 2K

R304

2K

R307 1K

R306

1K

VCC

GFS

SYSM

SENS

SCOR

DATA

CLOK

XLAT

GFS

XRST

LOAD

UNLD

SCLK
SQCK
1/2X

DISCO
DI/SW

R336

1K

R335

1K

R334

560R

VCC

1

2

3

M301B
LED1

GREEN

Trig IN

Trig SW

STANDBY LED

Relay

D+5V

R310

3K

1

2

3

4

KEY310
B.SCAN

R301

1K

SCLK

SQCK

1/2X

CD/CDR

1

2

3

M301A
LED1

RED

GREEN

RED

GND

R341
560R

VCC

R330
10K

R331
1K

1

2

3

Q309

8050

STANDBY CNL

RL101

D306
IN4148

1

2

3

Q307
8050

D403

3V3

D409
1N4148

R403
10K

R412

4K7

R413
47K

1

2

3

Q402

2SD1012F

1

2

3

Q403

2SA1015

1

2

3

Q401

2SA1015

R415
7K5

R405
22K

R406
7K5

A+12V

R416
47K

MUTE

C407

2200u/16V

D411

1N4148

C408
22u/16V

A+12V

D302
5393

C305

220uF/16V

C304

0.1u

4.2V

D+5V

D+10V

C310

1000uF/10V

NOTE:

1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS

OTHERWISE SPECIFIED.

2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS

OTHERWISE SPECIFIED.