Nad C-427 Service Manual

NAD

SERVICE MANUAL

Digital Media Tuner

C427

Digital Media Tuner

C427

TABLE OF CONTENTS

DESCRIPTION P A G E

SPECIFICATIONS…………………………….…………………………..........4

WIRING DIAGRAM…………………………………………………………...5

WIRING DIAGRAM PARTS LIST………………..…………………………....6

BLOCK DIAGRAM………………………………………………………….......7

CIRCUIT DIAGRAMS…………………………………………………….....8-10

PCB LAYOUT…………..................……………………..……….…….....11-15

ELECTRICAL VIEW PARTS LIST…………………………..……...…....16-23

EXPLODED VIEW

EXPLODED VIEW PARTS LIST

………………………………………………………...24-24

…………………………………….. ...24-24

FM SECTION
Usable Sensitivity (98 MHz) 10 dBu
Signal/Noise Ratio 65 dB (60 dB_ IHF-WTD Mono)

Frequency Response ±1.5 dB (20 Hz - 15 kHz, 60 dB_)
Channel Separation (60 dBu) 30 Hz 33 dB

1 kHz 40 dB

10 kHz 32 dB
Capture Ratio (40 dBu) 3 dB
AM Suppression 50 dB (60 dBu, 100% Mod. FM, 30% Mod. AM)
Image Rejection (119.4 MHz) 70 dB
I.F. Rejection (10.7 MHz) 70 dB
Pilot Suppression (60 dBu) 60 dB
Total Harmonic Distortion* - Mono 0.4%

Stereo
Auto Search Sensitivity 24 dBu
RDS Decode Sensitivity 26 dBu

0.8%

SPECIFICATION

60 dB (60 dB_ IHF-WTD Stereo)

AM SECTION
Usable Sensitivity (999/1000 Hz) 55 dB_
Signal/Noise Ratio (5 mV in) 42 dB
Total Harmonic Distortion (5 mV in) 1.5%
IF Rejection (450 kHz) 40 dB
Image Rejection (F+2xIF) 28 dB
Selectivity 20 dB
Loop Sensitivity (20dB S/N) - 999/1000 Hz 66 dB

603/600 Hz 66 dB

1404/1400 Hz 66 dB

Frequency response (100 - 2.3 kHz, 5 mV) ±6 dB

4

C427 WIRING DIAGRAM

FPP Board

R251

R252

R244
R245

Q203

D717

Q202

R257

R256

R240

K202

R253

Q207

C245

R266

R267

C243

R265

R282

Q210

R281

R280

K206

R268
C244

D208

D209

C242

R241

D207

R262

C228

T201

K203

C240

C241

R263

R264

D206
C231

R242

C232

D205

Q206

K207

C229

Q205

R243

C230

R260

M201

R248

R250

R261

Q204

K204

R237

U212

C223

R219

R215

C227

R212

R213

C225
C202

C222

C224

D202

U211

D2002

U209

C219

C218

R211

R233

R210

R234

U201

Q201

C207

C220

C214

R232

R229

C201

C226

R236

R201

R202

C208

U210

C203

U208

R208

R2002

R2001

R2000

R203

C209

C204

R222

R228

R221

R204

C205

U205

C206

U206

R205

D201

U203

R258

C236

C237

R259

K201

USB

R235

C210

R227

R214

R209

R207

C221

C400

R238

C405

K205

C234

R254

C235

R255

R2508

R239

Encorder Board

3

V201

FM/AM Tuner

2

PSU Board

S902

U904

Main Board

P601

R692

C696

C646

R690
C692
R649

R695

C1002

C693

R691
R648

C669

C645

C644

K601

D601

Q601

C698

R696

R697

C697

C617

R623

C616

R1002

1

J601

C609

Q602
R654
R652

C652

D602

R682

C689

C649

K603

R698

R622

R607

R681

D607

C688

R1355

Q1007

Q1008

R606

R1345

D1054

Q1010

R1347

C608

C1444 R662

C1443

D606

Y601

Q1011

R670

C658

R668

J603

J604

U614

C659

R667

R665

R663

C695

R664

C660

R673

C667

R675

C666

C694

R62

J606

R1352

R1348

R672

XM301

U611

R687

R61

R655

C647

J608

R650

U609

R669
R666

Q603

R686

C1001

R1001

U612

C657

C683

R683

R659

R685

C684

R684

J602

U610

U617

C686

R694

C650

R693

R657

U613

D605

D604

C687

R680

C685
R679

R676

Q6001

D603

R677

C690
C681

C674

C691

C682

Q604

C668

P602

C653

4

C655

R64

C654

C656

D119

C1011

R143

U6001

R678

C665

R674
R140

R141

C1000

R671

R1000

J605

C922

C921

P902

C919

C920

U908

C926

L904

C927

C908

D911

S903

C907

L901

D904

+

CY903

C906

C903

T901

CY901

D903

+

D902

+

D901

C925C923

+

T902

C918

Q901

U902

C932

C904

U905

D909

+

C931
R914

C917

TH901CY904

S901

J901

FUSE901

ZV901

L902

CX901

L903

D906

CX902

K901

CY902

TH902

5

WIRING DIAGRAM PARTS LIST

Item Part Number Description Remark

1 14-42717-00 Cable,1.25mm,17PIN,L=95mm Tuner To Main Board

2 14-42724-00 Cable,1.0mm,24PIN,L=240mm Key Board To Main Board

3 14-44604-01 Cable,UL2468#26AWG,4PIN,L=80mm Key Board To Encorde Board

4 14-42709-00 Cable,UL2468#26AWG*9C,9PIN,L=240mm PSU Board To Main Board

6

-VF

+VF

RS232

TRIG IN

IR IN

FM ANTENNA

AM ANTENNA

LOGIC
Buffer

GP1UV701QS

Key and IR front panel

D1G2V

3

KUANGXIN FM/AM/RDS MODULE

kst-mb114ma1-23

FM/AM LO

FM/AM RO

ENCODER

IR TRIG RS232

-VF

+VF

SPI
RDS DATA

-12V

+12V

TRANSFORMER

SPI
I2C
GPIO

Main MCU
M30281FAHP

Conversing

SWITCH
APM2301

GPIO

74LCX244

+8V

3V3S

VDF Driver MCU
PIC18F26K20

MAIN PSU
+/-12V 0.5A
+8V 0.5A

Standby PSU(TNY274PN)
standby (<0.2W dissipation )

5V 1A

3V3D

VFD

BOE CIG128X32

MAIN L

MAIN N

LO

RO

3V3D

3V3S

TRANSISTOR

LDO
AMS1117

5VD

LDO
AMS1117

+8V

5VS

PSU BOARD

AC INL E T

NAD C427 BLOCK DIAGRAM

Signal
Power
control

VERSION: V1.0
Drafted by: Ben

Data: 2013-06-25

7

CIRCUIT DIAGRAMS

1.MAIN BOARD VM2.0

M U TE

P602

9
8
7
6
5
4
3
2
1

TO PSU board

+12V A

D 1054
BA T 54S

R1347

47K

C1443

10 0 U /25 V

P601

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15
16
17

1.0-9-17PW B

+5V S

3V3S

10K

R1355

Q1008
DTC114EKA

D G N D

C1444

4 7 U / 2 5 V

+12V A

D G N D

D G N D
D G N D

8VD

8VD

D G N D

R695

C644

STE R EO
TUN ER D
PLL _C LK
PLL _DI
PLL _DO
PLL _C E
R D S_C LK
R D S_D AT A

R 6 4

10K

Q 1010

2SA1015

0

10 0 N

R692

DTC114

R1348

12K

A G N D

C645

10 0 N

0

4k7

R1352

A G N D

C696

N.I.

C646

2 2 0 U /2 5 V

Q 6 0 3

STBY

Q1007
DTC114EKA

D G N D

100K

+12V A

A G N D

D G N D

R690

+12V A

A G N D

D G N D

4K7

Q1011
2SC1815

R1345

C 6 9 2
10 0 P

R691

100K

JRC-27F/012-S

+5V S

C654
100N

C_M U TE

C 6 9 3
10 0 P

K601C

Q601

2SC1815

78

A G N D

C656

3 3 U / 2 5 V

R648

470R
R649

470R

+12V A

3

IN

FM /A M _LO

FM /A M _RO

D601
1N4148

C697
10N

R696

4k7

C698
100P

1

2

G

O U T

O

U613

AMS1117-3.3

4

J 6 0 5 A

S C J 3 5 1-D S S W

J 6 0 5 B

S C J 3 5 1-D S S W

J608

11

10

D Connector 9

R697

D G N D

0R

1
6
2
7
3
8
4
9
5

C653

100N

232G N D

B L E N D

3V3S

5
4

1

232G N D

21

25

JRC-27F/012-S

3V3S

C655

3 3 U / 2 5 V

R 14 1
2 0 K

R 14 3

1K

D 119

M M 3Z4V 7T1G

trig i

R676

1K

D 6 0 3

1S S 3 5 2

C684
EM I100p

C683

EM I100p

R 14 0
2 K

2K2
R677

4

5

K603C

2SC1815

K

A

232G N D

3 3 K J
R 6 7 4

C681
100N

100N
C690

R683

232G N D

330R
330R

R685

R698

3K9

K601B

JRC-27F/012-S

6

7

8

Q602

A G N D

K
A

232G N D

232G N D

C674 47nF

C682
100N

C691
100N

3V3S

b

C 6 6 5
10 0 nZ

Q 6 0 0 1

D T C 114

1
2
3
4
5
6
7

+12V A

D602
1N4148

C649
10N

R654

4k7

C652
100P

R 6 7 1

10 0 K J

e c

232G N D

U 617

/EN
C1+
V +
C1­C2+
C2­V ­RIN8RO U T

M A X 3221

D G N D

3V3S

TRIG_DE C

Q 6 0 4
D T C 114

3V3S

/FCO FF

V CC

G N D

D O U T

FCO N

D IN

/INV

R652

0R

1
2
3

R678
10k

16
15
14
13
12
11
10
9

U 6 12

A 0
A 1
A 2
V ss4SDA

24LC 16

47K

47K

3V3S

232G N D

A G N D

C _M U T E

V dd

W P

SCL

R 6 6 6

R 6 6 9

U6001

2
1

NC7WZ17

R679

10R

C686
100N

100R

R684

C1011

100n

a23y2
gnd

vcc

a1

8
7
6
5

y1

3V3S

R 6 0 6

4 7 0 R

K603B

6

5

K603A

2

3

JRC-27F/012-S

C 6 5 7

R 6 2 2

4 7 0 R

4

1

D G N D

100N

SCL
SDA

TRIG

3V3S232G N D

TRIGB

4
5

IR B

6

C685
10U/10V,

TPSA106M 010R 0900

R232_R X
R232_T X

R 6 0 7
4 7 R J

C 6 0 8
1N 2

C 6 16
1N 2

R 6 2 3
4 7 R J

V FM ISO

K EY _M ISO

FPCL K

FPM O SI

R232_T X
R232_R X

STE R EO
TUN ER D
PLL _C LK
PLL _DI
PLL _DO
PLL _C E

TRIG

R D S_D AT A

IRF
IRB

R D S_C LK

D G N D

C 6 0 9
2 2 0 P

C 6 17
2 2 0 P

D G N D

J601A

D G N D

R 6 6 4 B
R 6 6 4 C
R 6 6 5 A
R 6 6 5 B
R 6 6 5 C
R 6 6 5 D

R 6 1

R 6 2

2
1

R 6 8 6

R 6 8 7

R 6 6 2

10K

10K

L

ch ass is 3

J601B

R

U 609

A 13Y
G N D
A 0

N C7SZ157

120R

120R

47K

120R

120R
120R
120R
120R
120R
120R

3V3S

C647
100N

V cc

S

R 6 6 4 A

X M 300
H O LE

R1000
0R

D G N D A G N D

ST B Y

M ISO

4
5

3V3S

6

R 65 5

120R

32

CLK 3

31

SI3/P31

30
29
28
27
26
25
24
23
22
21
20
19
18
17

SO3/P 32
P33
P64
P65
RX D 1/P66
TX D 1/P67
TX D 2/P70
RX D 2/P71
P72
P73
P74
P75
P76
P77

BU SY
CLK 1

Sel

R 65 0A

34

33

35

R X D 0 /P6 2

T X D 0 /P6 3

P8 0

16

15

3V3S

C 6 9 4

22U F/16V

D G N D

C1000
N .I.

K E Y _ ST B

R 65 0B

120R

C L K 0 /P6 1

P8 2/IN T 014P8 1

13

C695
100N

120R

P6 036P2 7

X M 301
H O LE

R1001
0R

C1001
N .I.

X M 302
H O LE

R1002
0R

C1002
N .I.

D G N D

E N C A
E N C B

K EY _M ISO
IRF

SC L

V ST B

B L E N D

R 65 0C

R 65 0D

120R

120R

39

38

37

P2 5

P2 6

SD A

T R IG B

41

40

42

43

44

P2 3

P2 4

P2 2

SC L /P21

SD A /P2 0

X IN9V C C10P8 5/N M I11P8 4/IN T 212P8 3/IN T 1

X O U T7V SS

6

8

dgnd

R 6 7 5

1M E G

Y 6 0 1

C 6 6 6

20P

D G N D

E N CA

V FD _B U S Y a

E N C _ E nter

46

45

47

P1 6

P1 7

CE

R 6 7 3

33R

18.432 M H z

C 6 6 7

20P

E N CB

48

P1 5

P9 02C N V SS3P8 7/X CIN4P8 6/X CO U T5R E SE T

1

P0 3

P9 1

R 6 7 2

47K

P02
P01

P00
P107
P106
P105
P104
P103
P102
P101

A V SS

P100

V RE F

A V CC

P93

P92

U 6 11

49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

M30281F A H P

CN V ss

RESET

3V3S

CLK 1
CN V ss
R232_R X
CE
BU SY
R232_T X
RESET

R 6 6 3 A

120R

120R

120R

R 6 6 3 B

R 6 6 3 C

3V3S

D G N D

HEADER 7X2 2.54 pitch

J 6 0 6

1 2
3 4
5 6
7 8
9 10
11 12
13 14

R 6 6 7

10R

C 6 5 9

100N

LED _A

LED _B

M U TE

D G N D

0R

R 6 6 8

R 6 7 0

100K

D G N D

3V3S

3V3S

V FM ISO

C 6 5 8

22U F/16V

V STB
K EY _STB
FPCL K
FPM O SI

J 6 0 3

1
2

CON2

J 6 0 4

CON2

C650

D G N D

100n

1

4

5

2
4
6
8

19
11
13
15
17

U 6 14

M R

V D D

TPS3825

1G
A 1
A 2
A 3
A 4

2G
B1
B2
B3
B4

C 6 6 0

100N

D G N D

D G N D

D G N D

1
2

3V3S

20

10

D G N D

RESET

G N D

RESET

3V3S

18

1Y1

16

1Y2

V C C

14

1Y3

12

1Y4

9

2Y1

7

2Y2

5

2Y3

3

2Y4

G N D

U610
74LCX244

R 6 5 7 A
R 6 5 7 B
R 6 5 7 C
R 6 5 7 D

R 6 5 9 A
R 6 5 9 B
R 6 5 9 C
R 6 5 9 D

120R
120R
120R
120R

120R
120R
120R
120R

8VD

R693
220

3
2
1

D G N D

D G N D

D G N D

D 605

1SS352

R680
10R

C687
22N

D 604

1SS352

232G N D

R694
220

ch as sis 3

D 606

1SS352

3V3S

8VD

E N C A a

E N C B a

V FM ISO

K EY M ISO a

IRFa

V FSTBa
K EY STB a

FPCL K a

LED _A

FPM O SIa

V FD _BU SYa

EN C _Enter

LED _B

D G N D

A G N D

D G N D

C668

3 3 U / 2 5 V

D 607

1SS352

J602

24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1

To FPP Board

C669

3 3 U / 2 5 V

R681
10R

C688
22N

D G N D

R682
10R

A G N D

+12V A

A G N D

C689
22N

8