NAD T 763 Bedienungsanleitung

NAD

SERVICE MANUAL

T 763

Surround Sound Receiver

DRAFT DATE: 06 FEB 2004

SAFETY INFORMATION

AH VERSION

C VERSION

SERVICE SAFETY PRECAUTIONS

1. Replacing the fuses

CAUTION:

FOR CONTINUED PROTECTIONAGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF

FUSE.

Reference Designator Part Number Description

F751*AH 33-0191001-00-88 FUSE 10A/250VAC TIME-LAG 5X20mm

5T UL/CSA

F751*C 33-0181006-00-88 FUSE 6.3A/250VAC TIME-LAG 5X20mm

5T VDE/UL/CSA

F752*AH 33-0111006-00-88 FUSE 1.6A 250V TIME LAG 5x20mm 5T

UL/CSA/VDE/SEMKO

F752*C 33-0151006-00-88 FUSE 800mA 250V TIME LAG 5x20mm

5T UL/CSA/VDE/SEMKO

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 supply circuit.

CONTENTS

DESCRIPTION PAGE

SPECIFICATIONS............................................................................................................................ 4 - 5

REAR PANEL / FRONTPANEL VIEW .................................................................................................. 6

DISASSEMBLYINSTRUCTIONS .......................................................................................................... 7

WIRINGDIAGRAM................................................................................................................................ 8

BLOCKDIAGRAM................................................................................................................................. 9

SPECIALFUNCTION .......................................................................................................................... 10

DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING .................................................... 10

ADJUSTMENT POINTS DIAGRAM /AMPLIFIERADJUSTMENT .......................................................11

PCB LAYOUT ............................................................................................................................... 12 - 25

SCHEMATICDIAGRAM ............................................................................................................... 26 - 43

ICBLOCKDIAGRAM ................................................................................................................... 44 - 52

EXPLODEDVIEW........................................................................................................................ 53 - 54

EXPLODED VIEW PARTS LIST................................................................................................... 55 - 56

ELECTRICALPARTS LIST .......................................................................................................... 57 - 70

PACKINGDIAGRAM .......................................................................................................................... 71

VERSIONHISTORY .......................................................................................................................... 72

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.

SPECIFICATIONS

POWER AMPLIFIER SECTION

Rated distortion (Rated power level into 8 ohms, THD 20 Hz-20 kHz FL/C/FR) ≤0.1 %

(Rated power level into 8 ohms, THD 20 Hz-20 kHz SL/SR/BS) ≤0.1 %

Input Sensitivity (ref. 8 ohms, 1 kHz) 157 ± 20 mV

S/N Ratio (A-wtd, 1kHz, 1 W, 8 ohm, SL/SR/BL) ≥≥

≥≥

≥- 72 dB

Frequency Response (20 Hz - 20 kHz) 0 ± 1.0 dB

Channel Balance (1 dB to -40 dB, 1 kHz) ≤2 dB

(-41 dB to -50 dB, 1 kHz) ≤3 dB

Audio muting at 1 kHz ≥≥

≥≥

≥55 dB

Subwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) ≤0.5 %

Crosstalk (500 mV input, 10 W, 1 kHz) ≥≥

≥≥

≥-57 dB

Controls

Bass (at 500 mV in, 1 W out, 100 Hz) ± 10 dB ± 2 dB

Treble (at 500 mV in, 1 W out, 10 kHz) ± 10 dB ± 2 dB

DOLBY DIGITAL SECTION

Channel Difference(FL ref. Track 30) ± 1.2 dB

Frequency Resporse at Dolby config.2 SL Track 46 200 - 20 kHz ± 0.8 dB

SR Track 47 200 - 20 kHz ± 0.8 dB

C Track 44 200 - 20 kHz ± 0.8 dB

Harmonic Distortion (1 W, Audio LPF, Dolby Congfig 1) FL Track 65 997 Hz ≤0.08 %

FR Track 67 997 Hz ≤0.08 %

SL Track 68 997 Hz ≤0.08 %

SR Track 69 997 Hz ≤0.08 %

C Track 66 997 Hz ≤0.08 %

S/N Ratio (TRACK 30 for O/P 1 W, FAUSE) CCIR / ARM ≥≥

≥≥

≥65 dB

Audio LPF ≥≥

≥≥

≥70 dB

A-WTD ≥≥

≥≥

≥70 dB

Channel Separation (1W,A-WTDFILTER) Track 65 997 Hz ≥≥

≥≥

≥60 dB

DOLBY PRO LOGIC II SECTION

Frequency Resporse

I/P mode : L, R : 1 V in, 1 W, Ch L/R 40 Hz 0 ± 2.0 dB

20 kHz 0 ± 2.0 dB

I/P mode : L=R : 1 V in, 1 W, Ch /L/R 40 Hz 0 ± 2.0 dB

Ch C 20 kHz 0 ± 2.0 dB

I/P mode : L=-R : 1 V in, 1 W, Ch SL/SR 40 Hz 0 ± 2.0 dB

20 kHz 0 ± 2.0 dB

S/N Ratio (200 mV in, 1 W, A-WTD w/ 1 k termination)

I/P mode : L, R : 1 kHz, Ch L/R ≥≥

≥≥

≥65 dB

I/P mode : L=R : 1 kHz, Ch C ≥≥

≥≥

≥65 dB

I/P mode : L=-R : 1 kHz, Ch SL/SR ≥≥

≥≥

≥65 dB

THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) ≤0.2 %

DTS SECTION

Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.3 ± 1.3 W

Channel Difference (FL ref): FL/FR/C/SL/SR Track 6 1 kHz ± 1.0 dB

Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SR Track 10-14 1 kHz ≤≤

≤≤

≤0.08 %

Frequency Response (20 Hz to 20 kHz) Track 26-30 +2/-1.5

Subwoofer Output Level 1 kHz ref at pre-out (FL) Play Track 10, charge to 15 12.5 ± 1.5 dB

AM TUNER SECTION

Input level is expressed as the reading in open circuit

of 75-ohm source impedance signal generator

Usable sensitivity (999/1000 kHz) ≤≤

≤≤

≤30 dBuV

S/N Ratio (5 mV in) ≥≥

≥≥

≥38 dB

THD (5 mV in) ≤≤

≤≤

≤3 %

IF Rejection (450 kHz) ≤≤

≤≤

≤36 dB

Image Rejection (F+2xIF) ≥≥

≥≥

≥28 dB

Selectivity ≥≥

≥≥

≥17 dB

Output 170 -20/+30 mV

Loop sensitivity (20 dB S/N)

999/1000 kHz ≤≤

≤≤

≤66 dB

603/600 kHz ≤≤

≤≤

≤66 dB

1404/1400 kHz ≤≤

≤≤

≤66 dB

Frequency Response (100 - 2.3 kHz, 5 mV) ± 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) ≤≤

≤≤

≤15 dBµV ≤≤

≤≤

≤15 dBuv

S/N Ratio (60 dB, IHF wtd) Mono ≥≥

≥≥

≥63 dB ≥≥

≥≥

≥63 dB

Stereo ≥≥

≥≥

≥63 dB ≥≥

≥≥

≥63 dB

Frequency Response (20 Hz - 15 kHz, 60 dBµ) 0 ± 1.5 dB 0 ± 1.5 dB

Channel Separation (60 dBµ) 100 Hz ≥≥

≥≥

≥30 dB ≥≥

≥≥

≥30 dB

1 k ≥≥

≥≥

≥38 dB ≥≥

≥≥

≥38 dB

10 kHz ≥≥

≥≥

≥30 dB ≥≥

≥≥

≥30 dB

Alternate Channel Selectivity (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) ≥≥

≥≥

≥48 dB ≥≥

≥≥

≥48 dB

Image Rejection (119.4 MHz) ≥≥

≥≥

≥65 dB −−

−−

−

I.F. Rejection (10.7 MHz) −−

−−

−≥≥

≥≥

≥78 dB

Pilot Suppression (98 MHz) ≥≥

≥≥

≥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 −−

−−

−

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth) 435 x 167 x 382 mm

Net Weight 18.50 Kg (40.70 lbs)

Shipping Weight 22.20 Kg (48.84 lbs)

12 3456789

20 1119 12 13 14 15 16 17 18

T 763 (AH) NORTH AMERICA

T 763 (C) EUROPEAN VERSION

17 1516 13 101112

3 96 784

FRONT PANEL

REAR PANEL / FRONT PANEL VIEW

REAR PANEL

1. FM &AMANTENNA

2. MAIN IN /AUDIO PRE-OUTS /

SUBWOOFER OUT

3. SOFTCLIPPING ON/OFF

4. MONITOR OUT

5. MS OUT (MULTISOURCE OUT)

6. CD INPUT

7. IR INPUT & OUTPUT

8. 12V TRIGGER INPUT & OUTPUT

9. COMPONENT VIDEO IN &

COMPONENT VIDEO OUT

10. DIGITALAUDIO INPUT &

DIGITALAUDIO OUTPUT

11. RS-232

12. POWER SWITCH

13. SWITCHEDAC OUTLETS

14. AC POWER INLET

15. SPEAKERSA& B

16. DVD, SAT, VCR, VIDEO 4 & VIDEO 5

17. TAPE INPUT & OUTPUT

18. DISC INPUT

19. 7.1 CH. INPUTS

1. STANDBY SWITCH

2. STANDBY LED

3. AM / FM

4. FM MUTE / MODE

5. DISPLAY

6. MEMORY

7. PRESET DOWN / UP

8. SEARCH DOWN / UP

9. VFL DISPLAY

10. VOLUME (SETUP)

11. VIDEO &AUDIO

12. TAPE MONITOR

13. DIGITALAUDIOSELECTOR

14. EXT. 7.1

15. SURROUND MODE

16. LEVELS

17. TONE CONTROLS

18. TONE DEFEAT

19. SPEAKERSA& B

20. VIDEO 6 INPUT

21. PHONES

DISASSEMBLY INSTRUCTIONS

1. Remove machine screws M4.0 x 8.0 (1to 6) from the side panels.

Remove tapping screw 3.0 x 8.0 (7to 10) from the back panel.

Refer to Figure No. 1.

2. Pull both sides of theTOPCOVER slightly outwards 11 and tilt approx. 35 ° and then remove

in the direction as indicated by the arrow 12. Refer to Figure No. 2.

Figure No. 1

Figure No. 2

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WIRING DIAGRAM

BLOCK DIAGRAM

SPECIALFUNCTION

FEATURE KEYS PRESS ON FRONT PANEL

RESET FOR AH VERSION VIDEO + TONE DEFEAT

RESET FOR C VERSION VIDEO + TONE CONTROLS

NTSC / PAL SELECTION VIDEO + MEMORY

VFD ALL DISPLAY AUDIO + TAPE MONITOR

AM FREQ. STEP AM/FM + FM MUTE

DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING

T89C51RD2 (U202) main clock is at 20MHz (X202)

T89C51RD2 (U201) main clock is at 20MHz (X201)

UPPER - +5V supply to KEYBOARD when power up

LOWER - RESET line (TCM810LENB713) when

power up

UPPER - OUTPUT ENABLE (pin 24) of EPROM

(W27C02) when changing SURROUND MODES

LOWER - CHIP ENABLE (pin 22) of EPROM

(W27C02) when changing SURROUND MODES

SCLK (pin 43 of CS49326)

LRCLK (pin 42 of CS49326)

MCLK (pin 30 of CS49326)

NOTE: The waveforms are based on software version V1.26.

Andere Handbücher für T 763

Inhaltsverzeichnis

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