NAD C730 Manuel utilisateur

NAD

SERVICE MANUAL

C 730

STEREO

RECEIVER

C 730

STEREO

RECEIVER

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

M151 *AH 5120-0037-0 FU T3.15A 250V UL/CSA 5X20MM

M152 *C 5100-2530-1B T2.5A/250V IEC

M154 *AH 5120-0052-0 FUSE T1.6A 250V 5X20MM UL/CSA

NOTE:

<*AH > : USA, CANADIAN MODEL ONLY.

<*C > : EUROPEAN MODEL ONLY.

2. Safety check out

(Only U.S.A. model)

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.

CONTENTS

DESCRIPTION PAGE

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

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

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-14

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-19

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-23

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-33

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35-36

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

SPECIFICATIONS

POWER AMPLIFIER SECTION

1. Rated Distortion

(THD 20Hz-20KHz, 30W, 8 ohm) ≤0.08%

(THD 1KHz, 30W, 4 ohm) ≤0.1%

2. Input Sensitivity (ref. 30W 8 ohm, 1KHz) 350+/-30mV

3. S/N Ratio (A-wtd, 1K ohm, 500mV CD in, 1KHz) ≥-85dB

4. Frequency Response (500mV CD in, 1W, 20Hz-20KHz) 0±0.8dB

5. Channel Balance

Volume maximal output 30W (ref), 1KHz ≤1dB

1dB to -40dB, 1KHz ≤2dB

-41dB to -50dB, 1KHz ≤3dB

6. Audio Muting at 1KHz ≥-52dB

7. Headphone Output in 0.1% (600 ohm load, 500mV CD in, 1KHz) ≥10V

8. Crosstalk (2V input, 10W, 1KHz) ≤-63dB

PRE - AMPLIFIER SECTION

1. Rated Distortion (THD, 2V CD input, 4V output, 1KHz) ≤0.08%

2. Frequency Response (500mV CD in, 20Hz-20KHz) 0±0.08dB

3. S/N Ratio (A-wtd, 500mV CD in, 1KHz) ≥-85dB

4. Tone Control Response

Bass (500mV in,1W out ,100Hz) boost / cut 9±2dB

Treble (500mV in,1W out ,10KHz) boost / cut 9±2dB

AM TUNER SECTION

Frequency Range: AH 530 - 1710 KHz Step 10 KHz

C 531 - 1602 KHz Step 9 KHz

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator.

1. Usable Sensitivity (999/1000KHz) ≤30dBµV

2. S/N Ratio (5mV input) ≥38dB

3. THD (5mV input) ≤3%

4. IF Rejection (450KHz) ≥36dB

5. Image Rejection (F+2xIF) ≥28dB

6. Selectivity ≥17dB

7. Output 130mV±26mV

8. Loop Sensitivity (20dB S/N) 999/1000KHz ≤66dB

603/600KHz ≤66dB

1404/1400KHz ≤66dB

9. Frequency Response (100-2.3KHz, 5mV) 0±6dB

FM TUNER SECTION

Frequency Range: AH 87.5 - 108 MHz Step 50 KHz

C 87.5 - 108 MHz Step 50 KHz

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator. *C *AH

1. Usable Sensitivity (Mono, 98MHz) ≤15dBµ ≤15dBµ

2. S/N Ratio (60dBµ, IHF wtd) Mono ≥72dB ≥72dB

Stereo ≥66dB ≥66dB

3. THD (60dBµ, L=R, 75KHz Dev. for AH, 40KHz Dev. for C)

Mono ≤0.3% ≤0.3%

Stereo ≤0.35% ≤0.35%

4. IF Rejection (10.7MHz) ≥78dB ≥65dB

5. Image Rejection (119.4MHz) ≥85dB ≥85dB

6. Capture Ratio (40dBµ) ≤3dB ≤3dB

7. AM Suppression (60dBµ, 100%mod FM, 30%mod AM) ≥48dB ≥48dB

8. Pilot Suppression (60dBµ) ≥60dB ≥60dB

9. Frequency Response

(60dBµ, 20Hz - 15KHz in, 75µS for AH, 50µS for C and 0±1.5dB 0±1.5dB

Japan)

10. Channel Separation (60dBµ, IHF wtd) 100Hz ≥30dB ≥30dB

1KHz ≥38dB ≥38dB

10KHz ≥30dB ≥30dB

11. Alternate Channel Selectivity (±400KHz, IHF) ≥60dB ≥45dB

12. Muting Level 18±3dBµ 18±3dBµ

13. Output 750mV±150mV 500mV±100mV

14. Blend on Separation (60dBµ IHF wtd) 6±2dB 6±2dB

15. RDS Decode Sensitivity ≤26dBµ ≤26dBµ

16. Auto-search Sensitivity OFF ≤15dBµ ≤15dBµ

ON ≤24dBµ ≤24dBµ

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth) 435 x 109 x 305 mm

Net weight 7.2 kg (15.87 lbs)

Shipping weight 9.2 kg (20.5 lbs)

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

1. POWER ON / OFF

2. STAND-BY INDICATOR

3. BLEND

4. MEMORY

5. FM MUTE / MODE

6. AM / FM

7. DISPLAY

8. PRESET / TUNE

9. PRESET / TUNE AND

10. DISPLAY AREA

11. VOLUME

12. HEADPHONE SOCKET

13. INPUT SELECTORS

14. BASS & TREBLE

15. TONE DEFEAT

16. BALANCE

1. FM ANTENNA

2. AM ANTENNA

3. DISC INPUT

4. CD INPUT

5. VIDEO INPUT

6. AUX INPUT

7. TAPE 2 IN, OUT

8. TAPE 1 IN, OUT

9. PRE OUT

10. NAD-LINK IN, OUT

11. SOFT CLIPPING

12. 12V TRIGGER OUT

13. SPEAKERS

14. AC LINE CORD

15. SWITCHED AC OUTLET (AH version only)

DISASSEMBLY INSTRUCTIONS

1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels.

Remove tapping screw 3.0 x 8.5 ( 5 ) from the back panel.

Refer to Figure No.1.

Figure No.1

2. Pull both sides of the TOP COVER slightly outwards 6 and tilt approx. 35˚ and then remove

in the direction as indicated by the arrow 7 . Refer to Figure No.2.

Figure No.2.

BLOCK DIAGRAM

AM LOOP ANT FM ANT

FRONT END

ENV172D3G1

VFD

Protect

L R

CPU

KEY MATRIX

Trigger Out

REMOTE

SENSOR

DISC

VIDEO

AUX

TAPE-1

OUT

TAPE-2

OUT TC9273

TAPE-2

PRE OUT

TAPE-1

IN (Mon)

S1 1

12 17

PLL LC72723M

AM/FM IF

LA1837 TUNER

DIODE

MATRIX

NAD LINK

IN-OUT

MAIN

POWER

SUPPLY

SPEAKER

OUT

STAND BY

POWER

SUPPLY

RELAY

POWER

AMP.

+5V CPU

AC INPUT

ce data clk RDS-CLK RDS-SIG RDS-DATA

data

out

(#1)=Power On

(#2)=Protect (Flash 2Hz)

(#1)+(#2)=Standby

(#1)

(#2)

LC7218

Locking SW,

Tone defeat

ST/MO, MUTE, SMETER

TUNE

OSC/IF AM

OSC/IF

OUT

AUDIO

AUDIO IN

S10

VOLUME

MOTORIZE MUTE

WIRING DIAGRAM

MAIN BOARD

TRANSFORMER

SECONDARY BOARD

KEY BOARD

PSU BOARD

SPEAKER BOARD

BLACK

6PIN BLACK 6PIN BLACK

35PIN BLACK

BROWN

BLUE

3PIN BLACK

RED

AC INPUT

BLUE

3PIN BLACK

4PIN BLACK

BLACK

BLUE

GREEN

TUNER BOARD

POWER SWITCH BOARD

PHONE BOARD

LED BOARD

PRIMARY BOARD

P32

P39 P40 P41 P42 P43 P44 P45 P46 P47 P48

P33 P34 P35 P36

OSC RF

Testing

Point

TP2

Testing

Point

TP1

Testing

Point

TP3

Testing

Point

TP4

ADJUSTMENT POINTS DIAGRAM

1. TUNER

2. MAIN BOARD

SIGNAL

GENERATOR

OUTPUT

TERMINAL OUTPUT

TERMINAL

DISTORTION

ANALYZER

DISTORTION

ANALYZER

VOLTMETER

OSCILLOSCOPE

VOLTMETER

OSCILLOSCOPE

VOLTMETER

OSCILLOSCOPE

OUTPUT

TERMINAL

OUTPUT

TERMINAL

ANTENNA

TERMINAL

ANTENNA

TERMINAL

ANTENNA

TERMINAL

AM LOOP

ANTENNA

(Accessory)

AM LOOP

ANTENNA

60cm

DIGITAL

MILLIVOLT

METER

J911,

GND

SIGNAL

GENERATOR

SIGNAL

GENERATOR

SIGNAL

GENERATOR

RDS

GENERATOR

STEREO

GENERATOR

P901

MILLIVOLT

METER

UNIT

INSTRUMENT SETUP

1. FM MEASUREMENT

Fig. 1

Fig. 2

2. RDS MEASUREMENT

Fig. 3

3. AM MEASUREMENT

Fig. 4

ALIGNMENT PROCEDURES

AMPLIFIER SECTION

Step Item Connection Adjustment Adjust for

1 Left Channel Voltmeter to TP1, TP2 on Amp Board R868 2mV±0.2mV

2 Right Channel Voltmeter to TP3, TP4 on Amp Board R867 2mV±0.2mV

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