NAD S250 Manuel utilisateur

SERVICE MANUAL

S250

FIVE CHANNEL

POWER AMPLIFIER

FIVE CHANNEL

POWER AMPLIFIER

CONTENTS

FRONT PANEL / REAR PANEL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

ALIGNMENT PROCEDURE / ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . 5

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

SERVICE SAFETY PRECAUTIONS

1. Replacing the Fuses

CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY

WITH SAME TYPE OF FUSE.

REFERENCE NO. PART NUMBER DESCRIPTION

PSU Board

F1*AH 5120-0506-0 12.5A 250V Time Lag 6.3x32mm UR

F1*C 5120-0025-0 6.3A 250V HBC Time Lag 5x20mm SEMKO/VDE

Amp Board

F1-F2*AH 5120-0040-0 6.3A 250V Time Lag 5x20mm UL

F1-F2*C 5120-0025-0 6.3A 250V HBC Time Lag 5x20mm SEMKO/VDE

NOTE:

*AH : North American version only

*C : European version only

2. Safety-check out (North American model only)

Before returning the product to the customer, make leakage current or resistance measurements

to determine that exposed parts are acceptably insulated from the supply circuit.

Parts marked with the symbol are critical with regard to the risk of fire and electric shock.

Replace only with parts recommended by the manufacturer.

1. LEVEL CONTROL 5. 12V TRIGGER INPUT

2. INPUT JACK 6. SPEAKER TERMINALS

3. SOFT CLIPPING SWITCH 7. AC INLET

4. AUTO TRIGGER SWITCH

Five Channel Power Amplifier S250

1 2

SOFT CLIPPING

PROTECTION

1. POWER SWITCH 3. PROTECTION INDICATOR

2. POWER INDICATOR 4. SOFT CLIPPING INDICATOR

FRONT PANEL / REAR PANEL VIEW

FRONT PANEL CONTROLS

The graphic symbol of a lightning flash with an arrow point

within a triangle signifies that there is dangerous voltage

within the unit and it posses a hazard to anyone removing

the cover to gain access to the interior of the unit. Only

qualified service personnel should make such attempt.

The graphic symbol of an exclamation point within

an equilateral triangle warns a user of the device

that it is necessary to refer to the instruction

manual and its warnings for proper operation of

the unit.

REAR PANEL CONNECTIONS

AC MAINS INPUT

120V

TRIGGER IN

+12V

AUTO TRIGGER

4 5

SPECIFICATIONS

Specifications are measured in accordance with IHF standard IHF-A-202, 1978.

NOMINAL LIMIT

1. THD #0.02% #0.03%

2. Continuous Power Output 8 ohms $125W $100W

20kHz, 5 ch. for 8 ohms, 4 ch. for 4 ohms) 4 ohms $125W $100W

3. Clipping Power $135W $110W

4. S/N Ratio A-wtd $96dB $93dB

maximum) Audio BPF $89dB $86dB

5. Frequency Response 0 ~ -0.1dB 0 ~ -0.25dB

6. Input Sensitivity 100 ± 2 mV 100 ± 3 mV

maximum)

7. Channel Separation 1kHz $77dB $70dB

20kHz $67dB $50dB

8. Soft Clipping

Output Reduction 0.4 ~ 0.6 dB 0.3 ~ 1.0 dB

THD 5 ~ 6.5% 4 ~ 10%

R44 R40 R41

TP1

TP2

RELAY

R27

R45

IDLE CURRENT ALIGNMENT FOR EVERY POWER AMPLIFIER MODULE

1. Remove the load and the input signal.

2. Connect a digital voltmeter between TP1 and TP2.

3. Switch the amplifier on and, after one minute, adjust R27 to obtain a reading of

5mV ±0.5mV.

4. Leave power on for 3 minutes to allow the idle currents to stabilize. Re-adjust R27

as necessary to obtain a reading of 4.4mV ±0.5mV.

ALIGNMENT PROCEDURE

ADJUSTMENT POINTS

WIRING DIAGRAM

J3 +

J4 -

CHANNEL 5

AMP BOARD

J3 +

J4 -

CHANNEL 4

AMP BOARD

J3 +

J4 -

CHANNEL 3

AMP BOARD

J3 +

J4 -

CHANNEL 2

AMP BOARD

J3 +

J4 -

CHANNEL 1

AMP BOARD

PSN PSL

S6 M1

SS1 SS2

J18 J17 J19

J5 J4 J3 J2 J1

RED

BLK

BLU

BRN

WHT

YEL

GRN-YEL (230V ONLY)

GRY

ORN

VIO

GRY

ORN

VIO

RED

BLK

BLU

BRN

WHT

YEL

BRN (230V) BRN (230V)

BRN

BLU

BLU (230V)

RED

WHT

BLK

RED

WHT

BLK

RED

WHT

BLK

RED

WHT

BLK

RED

WHT

BLK

RED

S1 S2 S3 S4 S5 S6

M1 M2 M3 M4 M5 M6

RED

BLK BLU

BRN WHT —

120V

230V

120V

230V

BRN BLK WHT RED BLU

—

BLK WHT RED BLU BRN —

BLK WHT RED BRN BLU

—

MAIN

TRANSFORMER

STANDBY

TRANSFORMER

BLK RED BLK RED BLK RED BLK RED BLK RED

LEN

AC INLET

EMI FILTER

POWER SWITCH

STANDBY

TRANSFORMER

MAIN

TRANSFORMER

PSU BOARD

TRIGGER

SWITCH

BOARD

PWR

LED

PROT/SC

LED BD

J26

J27

J28

J22

J24

J25

BLU (120V)

BRN (120V)

CHASSIS

PSU BOARD - COMPONENT SIDE

PSU BOARD - SOLDER SIDE

PCB LAYOUT

AMP BOARD - COMPONENT SIDE AMP BOARD - SOLDER SIDE

T6.3A 250V SEMKO/VDE

SW1

R102

0.1u

33000uF/80V

47nF 250V

0.1u

R101

6R8 1W

R106

R103

0.01u

2 4

M101

LINE FILTER FOR 230V VERSION ONLY

AC1

AC INLET

POWER SWITCH

MAIN POWER TRANSFORMER

DIO-BRIDGE1

J10

U102A

HEF4011

6U102B

HEF4011

U102C

HEF4011

U102D

HEF4011

DC IN R107

SW2

AUTO POWER SW

R108

10K

R104

560

T102

STANDBY TRANSPORWER

R105

C102

470u/25V

U103

78L05

C103

0.1u

+5V

C12

10u/100V

C11

10u/100V

R12

750R

R11

750R

3K9 2W

D105

5V6

D11

IN4745A

D10

IN4745A

D12

IN4745A

D13

IN4745A

R10

3K9 2W

300R FP

390R

5 2

4 1

6 3

SW3

SOFT CLIPPING

10K 2W

LED1

POWER

LED2

LED CLIP

LED3

PROTECT

Q102

2SC1815

R112

10K

33000uF/80V

1R FP

10K 2W

C10

4.7u

V+ V-

V+

V-

V+

U101

TLP3063

Line

Filter

NEUTRAL

LIVE

FUSE

T12.5A 250V UL/CSA

CH1-5

V+

+VCTL

V-

-VCTL

GND

100V

IN OUT

GND

1/2W

OFF

R111

560R

+5V

MAIN TRANSFORMER

120V

230V

M1 M2 M3 M4 M5 M6

BRN

BLK

WHT

BLU RED

RED BLU

STANDBY TRANSFORMER

120V

230V

S1 S2 S3 S4 S5 S6

BLK

WHT

RED

BLU BRN

BRN BL U

D202

IN4148

D103

IN4148

D104

IN4148

IN4004

PROTECT

LED

POWER LED PCB

CILP PROTECT PCB

+VCTL

-VCTL

CLIP SWITCH PCB

Q101

TRIAC 20A

KDGND

DGND

+5V

POWER SUPPLY

J1-1

J1-2

J1-3

J1-4

J1-5

J1-6

J1-7

J1-8

J1-9

J1-10

T6.3A 250V

C24

0.1

C25

0.1

R63

Q26

MPSA06

Q25

2N6488

R65

7K5

C33

100u/16V

D19

IN4744

D20

IN4744

C34

100u/16V

R66

7K5

Q27

MPSA56

Q28

2N6491

R64

R67

2K2

R68

2K2

C35

470u/16V

C36

470u/16V

U2A

LM339

U2B

LM339

-U2C

LM339

U2D

LM339

U2E

LM339

U1C

NE5532

C37

0.1u

C38

0.1u

C28

0.1u

C27

0.1u

R57

R58

200K

D17

IN4004

C13

22u/25V

20%

D16

IN4148

R54

20K

2N4403

R56

R61

20K

R55

200K

R62

20K

R83

2K21 1%

R72

51K

ILIMIT

R69

100K

R70

200K D15

IN4148

C18

22u/25V

D18

IN4148

+12V

-12V

+12V

AMPOUT

R76

51K

C20

22u/25V

D22

IN4148

D21

IN4148

R73

20K

R75

510K

R74

20K

+12V

R80

825R

R79

R81

15K 1%

R78

2K21 1%

R77

11K5 1%

R85

100R

+12V

PROTECT

20%

V+

V-

20%

20% 50V 50V

50V 50V

1% NTC

1/2W FP

20%

C26

R60

D14

D23 4

PROTECT LED

COM

V-

V+

INSERT BUSS WIRE JUMPER 401-20003-00 FOR

R22. R50

SIGNIFIES SAFETY CRITICAL COMPONENTS

REFER TO THE SAFETY INFORMATION SECTION OF THE

SERVICE MANUAL FOR COMPLETE INFORMATION.

COMPONENTS NOT INSTALLED:

C10. C12. C14. C15. C21. C26.

D1. D2. D13. D14. D23. D24

R8. R20. R49. R52. R53. R60. R67. R68 AND R84.

ABBREVIATION: FLAME PROOF = FP.

ALL FP DESIGNATED PARTS ARE SAFTEY

CRITICAL REFER TO NOTE 5.

ALL CAPACTORS ARE IN MICROFARADS.

10%. 100V. ( DEFAULT VOLTAGE )

ALL RESISTORS ARE IN OHWS 1/4W 5%

RYDRV

AGND GND

GND AGND

+VCTL

-VCTL GND

+12V

-12V

AGND

SCHEMATIC DIAGRAM

POWER AMP 1

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