NAD C420 Manuel utilisateur

NAD

SERVICE MANUAL

C 420

STEREO

AM/FM TUNER

C 420

STEREO

AM/FM TUNER

SERVICE SAFETY PRECAUTIONS

1. 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

REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-16

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-25

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

SPECIFICATIONS

AM TUNER SECTION

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator

Usable Sensitivity (999/1000kHz) ≤30dBµ

S/N Ratio (5mV in) ≥38dB

THD (5mV in) ≤3%

IF Rejection (450kHz) ≥36dB

Image Rejection (F+2xIF) ≥28dB

Selectivity ≥17dB

Output 130 +/-20mV

Loop Sensitivity (20dB S/N) 999/1000 kHz ≤66 dB

603/600 kHz ≤66 dB

1404/1400 kHz ≤66 dB

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

FM TUNER SECTION *C *AH

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator

Usable Sensitivity (98 MHz) ≤13 dBµ ≤13 dBµ

Signal / Noise Ratio Mono ≥72 dB ≥72 dB

(60 dBµ, IHF wtd) Stereo ≥66 dB ≥66 dB

Frequency Response (20 Hz - 15 kHz, 60 dBµ) 0±1.0 dB 0±1.0 dB

Channel Separation (60 dBµ) 30 Hz ≥33 dB ≥33 dB

1 kHz ≥42 dB ≥42 dB

10 kHz ≥32 dB ≥32 dB

Alternate Channel Sensitivity

(40 dBµ, ±400 kHz) ≥60 dB ≥45 dB

Capture Ratio (40 dBµ) ≤3 dB ≤3 dB

AM Suppression

(60 dBµ, 100% Mod.FM, 30% Mod AM) ≥65 dB ≥65 dB

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

I.F. Rejection (10.7 MHz) ≥78 dB ≥78 dB

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

THD (60 dBµ, L=R 75 kHz for AH, 40 kHz Dev for C)

Mono ≤0.25% ≤0.25%

Stereo ≤0.35% ≤0.35%

Auto-Search sensitivity On ≥24 dBµ ≥24 dBµ

Off ≤15 dBµ ≤15 dBµ

RDS Decode Sensitivity ≤26 dBµ ≤26 dBµ

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth) 435 x 80 x 285 mm

Net weight 4 kg (8.8 lbs)

Shipping weight 5.1 kg (11.22 lbs)

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

1. FM ANTENNA

2. AM ANTENNA

3. OUTPUT

4. NAD-LINK IN/OUT

5. 12V TRIGGER IN

6. AC LINE CORD

1. POWER ON / OFF

2. STAND-BY LED

3. BLEND

4. MEMORY

5. FM MUTE / MODE

6. AM / FM

7. DISPLAY

8. PRESET / TUNE

9. DISPLAY AREA

10. PRESET / TUNE AND

IMPORTANT NOTES

1. Show the software version

Press “PRESET/TUNE” and “TUNE UP” ( ).

2. Light UP all the icon on the VFL

Press “PRESET/TUNE” and “TUNE DOWN” ( ).

3. CPU Resets

Press “PRESET/TUNE” and “TUNE DOWN” ( ) and any one key.

4. AM Step 10K/9K Change

Add D206: 10KHz / Delete D206: 9KHz.

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 OUTPUT

FRONT END

ENV172D3G1

VFD

CPU

LC866448B

U201

KEY MATRIX

Trigger IN

U202

EEPROM

24C08

PLL LC72723M

RDS DECODER

U901

AM/FM IF

LA1837 MUTING

DIODE

MATRIX

NAD LINK

IN-OUT

M218

REMOTE

SENSOR POWER

SUPPLY

VFD

-VP

+5V CPU

+10V

AC INPUT

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

MPXIN

data

out

(#1)=Power On

(#2)=Protect (Flash 2Hz)

(#1)+(#2)=Standby

(#1)

(#2)

LC7218

U903

ST/MO, MUTE, SMETER

TUNE

OSC/IF AM

OSC/IF

U902

2 3 4 5 15

6 IN

2 OUT

16 14

75 76 74

19 18

WIRING DIAGRAM

MAIN BOARD

KEY BOARD

LED BOARD TRANSFORMER

YELLOW

BLUE

WHITE

POWER SUPPLY BOARD

Trigger In

Audio

L,R Out

ADJUSTMENT POINTS DIAGRAM

OSC RF

Trigger In

Audio

L,R Out

SIGNAL

GENERATOR

ANTENNA

TERMINAL OUTPUT

TERMINAL

DISTORTION

METER

DISTORTION

METER

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

VT_J911

SIGNAL

GENERATOR

SIGNAL

GENERATOR

SIGNAL

GENERATOR

RDS

GENERATOR

STEREO

GENERATOR

P901

OUTPUT

TERMINAL

MILLIVOLT-

METER

UNIT

INSTRUMENT SETUP

1. FM MEASUREMENT

Fig. 1

Fig. 2

2. RDS MEASUREMENT

Fig. 3

3. AM MEASUREMENT

Fig. 4

ALIGNMENT PROCEDURES

FM/RDS SECTION

- FM mono: 1kHz, 75kHz devi., 60dB/µV

- FM stereo: 1kHz, 67.5kHz devi., 60dB/µV

Pilot signal 19kHz 7.5kHz devi.

OUTPUTS

- Connect the 47Kohm resistor unless otherwise noted.

Item

IF/RF

Stereo

Distortion

Stereo

Separation

Mute

Level Signal

output

Step

1DC voltmeter L941 0±70mV

3Distortion

analyzer

Distortion

analyzer

Oscilloscope

L942

R941

R956

Minimum

2 AC voltmeter IFT on the

front end

IFT on the

front end

Maximum

separation

Distortion

Meter Minimum

Connection

of instrument

Fig.1 –

–

Fig.2

Fig.1

Channel L

or R 1kHz

99.0MHz

1kHz 75kHz devi.

65dBf (60dB)

99.0MHz Ext.

mod. 65dBf

(60dB)

FM SG

output Stereo mod-

ulator output Tuning

frequency

99.0MHz

Channel L

or R 1kHz

99.0MHz Ext.

mod. 65dBf

(60dB)

99.0MHz Ext.

mod. 65dBf

(60dB)

RDS 2% MOD

99.0MHz 18dB

99.0MHz

RDS –– ––Fig.3 99.0MHz

Output

indicator Adjustment

point Adjust

for Remarks

FM MUTE/MODE

switch: ON/AUTO

Repeat the steps

1 to 3 until no fur-

ther adjustment is

necessary.

FM MUTE/MODE

switch: ON/AUTO

Don’t turn more

than ±180˚

Repeat stereo

distortion and

stereo separation

alignment until

THD at minimum

and separation at

maximum.

Decode

the RDS-

Program station

AM SECTION

AF Modulation: 400Hz, 30%

For AH Version

Step

1 –

530kHz

600kHz

990kHz

600kHz

400Hz 30% mod.

60dB/m

AM SG

output Tuning

frequency Output

indicator Adjustment

point

600kHz

400Hz 30% mod.

60dB/m

voltmeter

Digital

voltmeter

L972

OSC coil

on RF

block M971

RF coil

on RF

block M971

Adjust

for

1.35±0.2V

Maximum

Step

1 –

522kHz

531kHz

603kHz

999kHz

600kHz

400Hz 30% mod.

60dB/m

AM SG

output Tuning

frequency Output

indicator Adjustment

point

600kHz

400Hz 30% mod.

60dB/m

voltmeter

Digital

voltmeter

L972

OSC coil

on RF

block M971

RF coil

on RF

block M971

Adjust

for

1.3±0.2V (522kHz)

1.35±0.2V (531kHz)

Maximum

For C Version

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