NAD 300 Manuale utente

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CONTENTS

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

SPECIFICATIONS

DISASSEMB LY I NSTRUCTI ONS 7

DIAL STRINGING DETAIL

ALIGNMENT AND CHECK POINTS

ALIGNMENTPROCEDURES ....9-

CHANGING POWER LINE VOLTAGES

TROUBLESHOOTI NG

TUNER FRONT-END

OO36TUNERBOARD ...2O

5027 PRE-AMPLIFIER BOARD ..,.. 21

6038 MAIN AMPLIFIER BOARD

7105 SWITCH BOARD

7110 DOLBY NR BOARD

7118 DOLBY FM CALIBRATION BOARD

BO25 POWER SUPPLY BOARD ...... 25

9025 TONE AMPLIFIEB BOARD .... 26

ELECTRICAL PARTS LIST 27 - 36

M ISCE LLAN EOUS PARTS LIST

PAGE

3- 6

BLOCK DIAGRAM

INTERNAL VIEW OF INTEGRATED CIRCUIT

SCHEMATIC DIAGRAM SEPARATE SHEET

1. SPECIFICATIONS

A. FM SECTION

1. FM Tuning Range

*Adjustment for tuning prohibited below 87.5 MHz

in West Germany

2. Dial Calibration Accuracy 90 & 106 MHz

98 MHz

IHF Sensitivity at 90, 98 & 106 MHz

Noise and Distortion: -30 dB

lmage Rejection at 98 MHz

lF Rejection at 90 MHz

AM Rejection at 98 MHz

at 30% AM & 100% FM Simultaneous Modulation,

100 - 20,000 pV Antenna lnput

Limiter Sensitivity

at - 1 dB Below Maximum Audio

Total Harmonic Distortion at 98 MHz TAPE OUT

(at 400 Hz lOOo/o Modulation, 1,000 pV lnput)

Spurious Response at 98 MHz

Antenna lnput: 3 pV

OSC 2nd 206.7 MHz

1/2lF 103.35 MHz

10. lF Bandwidth,6 dB down Antenna lnput: 100pV

1 1 . lF Bandwidth, 50 dB down Antenna lnput: 100 pV

12. Signal-to-Noise Ratio 100% Mod., 1 mV lnput

13. Capture Ratio 1,000 prV, MONO lnput

14. Output Voltage

Stereo and Mono, 4OO H2,100% Mod. TAPE-2 OUT

15. Alternate Channel Selectivity (lH F)

Antenna lnput: 100 pV

16. Muting Threshold

B. FM MPX SECTION

1. Stereo Separation at 98 MHz

(Antenna lnput: 1,000 pV) 100 Hz

1 kHz

10 kHz

Hl-BLEND on, at 1 kHz

2. Total Harmonic Distortion

at 98 MHz Stereo, 1 mV Antenna lnput 1 kHz and/or

500 Hz 100% Mod., at REC OUT

3. Automatic Stereo Threshold

4. Residual 19 kHz & 38 kHz at 98 MHz, 1 mV lnput

5. Stereo Frequency Response 40 - 10,000 Hz

6. 19 kHz Pilot Signal Dev. to Activate

NOMINAL LIMIT

*87.7-108

r 150

t'100

1.8

t 200

x2OO

2.8

0.8

B-20

1.2

5-16

1.6

o.25

250

600

1.2

1.0

o.4

0.6

200

800

1 313

UN IT

MHz

kHz

LIMIT

NOMINAL

W/Channel

535-1,605

400

4-10

0.15

+0.5

-2.O

310.5

200130

2.2tO.5

200t30

200t30/30t5

t1.2

525-1,650

200

C. AM SECTION

1. AM Tuning Range

2. Sensitivity (lHF)

at 600, '1,000, 1,4OO kHz, 400 H2,30% Mod.

3. Bandwidth 6 dB down

at 1,000 kHz with Antenna lnput of 500 pVlm

4. lmage Rejection at 1,400 kHz

5. lF Rejection at 600 kHz

6. AGC Figure of Merit Form 0.2 V/m, at 1,000 kHz

7. Total Harmonic Distortion

at 1,000 kHz 5,000 pYlm Antenna lnPut,

4OO H2,30% Mod., at REC OUT

8. Dial Calibration Accuracy 600 kHz

1,000 kHz

1,400 kHz

9. Output Voltage

1 kHz 30% Mod. 5 mV/m lnput at TAPE 2 OUT

10. Signal-to-'Noise Ratio

400 Hz 30% Mod. 50 mV/m lnPut

D. AUDIO SECTION

1. Output Power

0.3% THD, 2O Hz - 20 kHz, B ohms Load,

Both Channels Driven

2. Harmonic Distortion

at 1 kHz,8 ohms Load, 65Watts OutPut

3. lntermodulation Distortion

at2Y Output,4 ohms Load

4. Frequency Response

AUX 1 W Output, 8 ohms Load

20 Hz - 2O kH,z

5. lnput Sensitivity

at 1 kHz, for 25.3 Volt Output, B ohms Load

PHONO

AUX

Mrc

TAPE IN

6. Tape Recording OutPut Level

Front Panel Phono Jack/Rear Panel DIN Jack

at PHONO lnput: i mV

7. Phono lnput Equalization

50 - 15,000 Hz

NOMINAL LIMIT UNIT

8. Harmonic Distortion of EO Amplifier Section

at 1 kHz, 50 mV lnput

9. Overload Capability of EO Amplifier Section

at 1 kHz, 0.1% HD

10. Tone Control

BASS at 100 Hz

TREBLE at 10 kHz

11. Gain Difference of Left and Right Channels

at AUX and PHONO

12. High-Filter at7 kHz

13. Subsonic Filter at 40 Hz

14. Channel Separation on AUX lnput.

Opposite Channel : Shorted

i00 Hz

1 kHz

10 kHz

15. Signal-to-Noise Ratio (lnput Shorted)

PHONO

AUX

TAPE IN

Volume Minimum

16. LOUDNESS Compensation (-30 dB)

100 Hz

10 kHz

17. Harmonic Distortion of Pre-Amplifier Section

20 Hz - 20 k{z,2 Volt Output 50 Kohms Load

18. lnput Sensitivity of Pre-Amplifier Section

at 1 kHz, for 25.3 Volts Output, 8 ohms Load

E. DOLBY NR SECTION

1 . Output vs lnput at R EC Position

at2k1z,0 dB=30 mV

lnput Level 0 dB

-20 dB

_;3 3B

2. Output vs lnput at PLAY Position

at 5 kHz, 0 dB=30 mV

lnput Level 0 dB

-20 dB

-30 dB

3. Frequency Response of DOLBY FM

lnput=3O mV 5 kHz

10 kHz

0.035

240

t10

-5

-3

o.o2

-15.7

-21.5

-31.1

-26.7

-40.3

0.08

200

t1Ot2

!1O!2

1.5

+8t2

+5t2

0.1

1!O.2

-15.7t2

-21.5t2

-31.1t2

-26.7!2

-40.3x2

+31 1

+5r 1

LIMIT

NOMINAL

F. GENERAL

1. Power Requirements

22OVAC,50 Hz (12O,24O VAC,50 Hz)

2. Dimensions

508(W) x 400(D) x 145(H) mm

3. Weisht 22 Ks.

2. DISASSEMBLY INSTRUCTIONS

Removing the metal enclosure from chassis. (Refer to Figure A)

Remove seven screws from top of the enclosure and four screws from both sides of the en-

closure, then pull off the enclosure f rom the chassis.

Removing the Front Panel. (Refer to Figure A)

a) Pull off all the control knobs except for PLAY CAL and REC LEVEL.

b) Remove three nuts from SELECTOR, SPEAKERS and DOLBY NR controls.

c) Remove three screws from top of the Front Panel and remove Front Panel.

Note: Numbers shown in circles correspond to Miscellaneous

Parts List on Page 37.

Figure A

'-V)

PIJLLEY

DIAL DRUM

(2 TURNS)

6l)

Y6;)

l'/e

t/r

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3. DIAL STRINGING DETAIL

. PULLEY

Note: Tuning capacitor should be fully closed position

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Er^ \

q.P9 , I

4.ALIGNMENT AND CHECK POINTS

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F F FF F

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5. ALIGNMENT PROCEDURES

Do not attempt alignment unless the following equipment is available.

EOUIPMENT DESCRIPTION

1. AM Signal Generator 5. Stereo Modulator 9. Frequency Counter

2. Oscilloscope

3. AC Voltmeter 6. Audio Generator

7. Distortion meter

4. FM Signal Generator 8. DC Voltmeter

AM IF & RF ALIGNMENT

Output of signal generator should be no higher than necessary to obtain an output reading.

Set SELECTOR switch 51 to AM.

[--00 cm

Loop Antenna

STEP SIGNAL

GENERATOR

COUPLING

Refer Fig.

S.IGNAL

GENERATOR

F REOUENCY

455 kHz

(400 Hz Mod.)

RECE IVER

DIAL

SETTI NG INDICATOR

AC Voltmeter

to TAPE OUT

jack.

ADJUSTMENT REMARKS

Point of non-

i nterference.

(on/about

600 kHz)

T401 (RF Coil)

Both sections

CF4O1

Adjust for

maximum

reading.

2Same as Step 1600 kHz

(400 Hz Mod.) 600 kHz Same as step 11401 (OSC Coil)

L451(ANT Coil)

Adjust for

maximum

read i ng.

3Same as Step 11400 kHz

(400 Hz Mod.) 1400 kHz Same as step 1

TC107

(OSC Trimmer)

TC105

(ANT Trimmer)

TC106

(RF Trimmer)

Adjust for

maximum

reading.

Repeat steps

(2) and (3)

4 Same as Step 11000 kHz

(400 Hz Mod.) 1000 kHz Same as step 1V R4O2 Adjust for

150 mV

Audio

Output

5Same as Step 1

1000 kHz

(400 Hz Mod.)

SG output

level 28mV/m 1000 kHz SIGNAL Meter VR4O1

Adjust for

maximum

read i ng

on SIGNAL

meter

AM/FM IF

L401, T401,

cF401

TUNER

FRONT END

TC105, TC106

TC107

Fis.1 AM ALIGNMENT CONNECTION

FM RF AND IF ALIGNMENT

Signa|generatoroutputshouldbenohigherthannecessarytoobtainanoutputreading.

Set Selector switch to FM'

Signal Generator deviation: 75 kHz

REMARKS

SIGNAL

GENERATOR

COUPLI NG

SIGNAL

GENERATOR

FREOUENCY

RECEIVER

DIAL

SETTING tNDTCATOR i AOlUsrn/lerur

Connect to FM

Antenna Terminal

through FM

DummY Antenna

(300sl) Fig' 2

90 MHz

(400 Hz. Mod.)

Adjust for

maximum

reading on

Voltmeter

Same as Step 1

AC Voltmeter

connected to

TAPE OUT

jack

Same as Step 1

1104

(FM OSC Coil)

L1 01

(FM ANT Coil)

L102, L103

(FM RF Coil)

(oolofi.Yil'"0'' i '06 MHz

TC104

(FM OSC

Trimmer)

TC101

(FM ANT

Trimmer)

TC102, TC103

(FM RF

Trimmer)

Adjust for

maximum

reading

Repeat steps 1 & 2 until no further improvement is possible'

T101 (FM IFT)

Same as Step 1

DC Voltmeter:

connect

between BASE

of TR305 and

Ground

T2O1 TOP

(DISCRIMI-

NATOR)

Adjust for

maximum

reading

90 MHz

(4OO Hz, Mod.)

Same as Step 1

Adjust for

0V on DC

Voltmeter

90 MHz

(400 Hz, Mod.)

Same as Step 1

Adjust for

minimum

distortion

r*o3o-1il'"a., oo uu'

Distortion

Meter

connected to

TAPE OUT

jack

T201 Bottom

Same as Step 1

Adjust for

maximum

read i ng

9BMHz I L

!4^00 Hz, Mod.) i n, ,r, I signrr Meter

SG output

level: 1 V

Same as Step 1

Adjust for

60 mV read-

ing on AC

Voltmeter

AC Voltmeter

connected to

PIN 2 (or 9) of I vnzgta(or b)

7110 DOLBY

NR BOARD

98 MHz

(400 Hz, Mod.)

Fig.2 FM DUMMY ANTENNA

FM Dummy Antenna to 300o

antenna terminal of Receiver. Zin = 5012 (75o)

125c} (112.50)

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