NAD Electronics T 762 Service Manual

DRAFT DATE: July 08

NAD

SERVICE MANUAL

T 762

AV SURROUND

T 762

AV SURROUND

SOUND RECEIVER

SOUND RECEIVER

SAFETY INFORMATION

2

SERVICE SAFETY PRECAUTIONS

1. Replacing the fuses

CAUTION:

FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY WITH SAME TYPE OF
FUSE.

Reference Designator Part Number Description

F751*AH 33-0191001-00-88 Fuse 10A 250V Time Lag 5x20 MM UL/CSA
F751*C 33-0181006-00-88 Fuse 6.3A 250V Time Lag 5x20 MM

UL/CSA/SEMKO/VDE

F752*AH 33-0111006-00-48 Fuse 1.6A 250V Time Lag 5x20 MM

F752*C 33-0151006-00-48 Fuse 800mA 250V Time Lag 5x20 MM

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.

UL/CSA/VDE/SEMKO

UL/CSA/VDE/SEMKO

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

REAR PANEL / FRONT PANEL VIEW ................................................................................................. 6

DISASSEMBLY INSTRUCTIONS ......................................................................................................... 7

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

BLOCK DIAGRAM ................................................................................................................................ 9

ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT ..................................................... 10

PCB LAYOUT ................................................................................................................................11 - 22

SCHEMATIC DIAGRAM ............................................................................................................... 23 - 38

IC BLOCK DIAGRAM ................................................................................................................... 39 - 47

EXPLODED VIEW ............................................................................................................................... 48

EXPLODED VIEW PARTS LIST................................................................................................... 49 - 50

ELECTRICAL PARTS LIST .......................................................................................................... 51 - 65

PACKING DIAGRAM .......................................................................................................................... 66

VERSION HISTORY .......................................................................................................................... 67

VERSION T762i PARTS LIST ........................................................................................................ 68

3

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) 220 ± 20 mV

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

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
Subwoofer out, 500 mV in (THD at 2 V O/P, 100 Hz) ≤ 0.5 %
Crosstalk (500 mV input, 10 W, 1 kHz)

≥≥

≥ - 72 dB

≥≥

≥≥

≥ 55 dB

≥≥

≥≥

≥ -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 (31 for O/P 1 W, Track 35) CCIR / ARM

Audio LPF
A-wtd

Channel Separation (1 W, 20 kHz LPF) Track 65 997 Hz

≥≥

≥ 65 dB

≥≥

≥≥

≥ 70 dB

≥≥

≥≥

≥ 70 dB

≥≥

≥≥

≥ 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 Hz 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
I/P mode : L=R : 1 kHz, Ch C
I/P mode : L=-R : 1 kHz, Ch SL/SR
THD (2.2 V in, 1 W, w/ 80 kHz LPF, 1 kHz) ≤ 0.2 %

4

≥≥

≥ 65 dB

≥≥

≥≥

≥ 65 dB

≥≥

≥≥

≥ 65 dB

≥≥

DTS SECTION

Output Level (Vol 0 dB) : FL/FR/C/SL/SR Track 6 1 kHz 0.5 ± 2.0 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
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 10.5 ± 1.5 dB

≤≤

≤ 0.08 %

≤≤

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)
S/N Ratio (5 mV in)
THD (5 mV in)
IF Rejection (450 kHz)
Image Rejection (F+2xIF)
Selectivity
Output 170 ± 20 mV
Loop sensitivity (20 dB S/N)

999/1000 kHz
603/600 kHz
1404/1400 kHz

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

≤≤

≤ 30 dBuV

≤≤

≥≥

≥ 38 dB

≥≥

≤≤

≤ 3 %

≤≤

≤≤

≤ 36 dB

≤≤

≥≥

≥ 28 dB

≥≥

≥≥

≥ 17 dB

≥≥

≤≤

≤ 66 dB

≤≤

≤≤

≤ 66 dB

≤≤

≤≤

≤ 66 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)
S/N Ratio (60 dB, IHF wtd) Mono

Stereo

Frequency Response (20 Hz - 15 kHz, 60 dBμ) 0 ± 1.5 dB 0 ± 1.5 dB
Channel Separation (60 dBμ) 100 Hz

1 k

10 kHz
Alternate Channel Selectivity (40 dBμ, ± 400 kHz)
Capture Ratio (40 dBμ)
AM Suppression (60 dBμ, 100% Mod. FM, 30% Mod. AM)
Image Rejection (119.4 MHz)
I.F. Rejection (10.7 MHz)
Pilot Suppression (98 MHz)
THD (60 dBμ, L=R 75 kHz for AH, 40 kHz Dev for C) Mono

Stereo
Auto-Search Sensitivity On

Off
RDS decode Sensitivity

≤≤

≤ 15 dBμV

≤≤

≥≥

≥ 63 dB

≥≥

≥≥

≥ 63 dB

≥≥

≥≥

≥ 30 dB

≥≥

≥≥

≥ 38 dB

≥≥

≥≥

≥ 30 dB

≥≥

≥≥

≥ 60 dB

≥≥

≤≤

≤ 3 dB

≤≤

≥≥

≥ 48 dB

≥≥

≥≥

≥ 65 dB

≥≥

−−

−

−−

≥≥

≥ 60 dB

≥≥

≤≤

≤ 0.25 %

≤≤

≤≤

≤ 0.35 %

≤≤

≥≥

≥ 24 dBμ

≥≥

≤≤

≤ 15 dBμ

≤≤

≤≤

≤ 26 dBμ

≤≤

≤≤

≤ 15 dBuv

≤≤

≥≥

≥ 63 dB

≥≥

≥≥

≥ 63 dB

≥≥

≥≥

≥ 30 dB

≥≥

≥≥

≥ 38 dB

≥≥

≥≥

≥ 30 dB

≥≥

≥≥

≥ 45 dB

≥≥

≤≤

≤ 3 dB

≤≤

≥≥

≥ 48 dB

≥≥

−−

−

−−

≥≥

≥ 78 dB

≥≥

≥≥

≥ 60 dB

≥≥

≤≤

≤ 0.25 %

≤≤

≤≤

≤ 0.35 %

≤≤

≥≥

≥ 24 dBμ

≥≥

≤≤

≤ 15 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)

5

REAR PANEL / FRONT PANEL VIEW

REAR PANEL

1. FM & AM ANTENNA

10. DIGITAL AUDIO INPUT &

2. MAIN IN / AUDIO PRE-OUTS /
SUBWOOFER OUT

3. SOFT CLIPPING 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 &

11. RS-232

12. SWITCHED AC OUTLETS

13. AC POWER INLET

14. SPEAKERS A & B

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

16. TAPE INPUT & OUTPUT

17. DISC INPUT

18. 7.1 CH. INPUTS

COMPONENT VIDEO OUT

FRONT PANEL

1 2 3456 7 89

DIGITAL AUDIO OUTPUT

10

21 20 1119 12 13 14 15 16 17 18

1. POWER

2. STAND-BY

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. DIGITAL AUDIO SELECTOR

14. EXT. 7.1

6

15. SURROUND MODE

16. LEVELS

17. TONE CONTROLS

18. TONE DEFEAT

19. SPEAKERS A & B

20. VIDEO 6 INPUT

21. PHONES

DISASSEMBLY INSTRUCTIONS

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

Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel.
Refer to Figure No. 1.

9

10

3

1

2

8

7

6

4

5

Figure No. 1

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

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

12

11

11

Figure No. 2

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60

WIRING DIAGRAM

3

NER

mm

1-71-XX

L=2

2

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P1.2

FC CABLE 17 PIN

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2.
2

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mm

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BLOCK DIAGRAM

CPU

CPU

IN

MULTI-CH

MUTE

OUT

MULTI-CH

control to

force 2 channel

Head phone

FR

Relay

FL

Speaker

AMP

POWER

FLFRC

Output

T

L-CH

Output

Speaker

Relay

C

PROTECT

SL

CPU

Relay

SL

AMP

POWER

Speaker

Output

Relay

SR

SR

BSL

AMP

POWER

BSL

CPU

L-CH

MS LINE-AMP

MS

AUDIO

R-CH

MS LINE-AMP

IDE

R-CH

1

MUTE

SL

SR

T

T

CK
L

ATA

1

P

T

T

T

ET

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2

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7
1

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2

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CPU

SUB

ELECT

VOLUME

D/A

96/24

CS4340

A

24

4

A

24

4

4

A

24

4

P

1
D
A

M62446

CPU

3

MUTE

C

R

L

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BSR

L

t

R

ire
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a

FRONT

CPU

FL

SELECTOR

TC-9164AN

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r
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onfi

ele

4

MUTE

FR

FL

BASS

TREBLE

FR

Stereo mode

AC3 mode

Multi Ch in

BSL

BSR

CPU

P

CPU CPU

LC4966

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BSL

BSL

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2

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CPU

CPU

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FD Driver

4

Power

Main

Encoder

Volume

Supply

Remote

Relay

CPU

MSR

AC Input

Board

Tuner

LA1837 +

LC72131 +

BU1924

CE/Data/Clk, RDSbus

Pin ( ST/MO, Mute, S Meter )

CPU

EEPRO

AT24C02

U202 VFD U201 A/V-R

N

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AXIAL 2

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3

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27

4

C

-

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CP

T

2

P

D

NER

9

ADJUSTMENT POINT DIAGRAM

FRONT/CENTER AMPLIFIER BOARD

R522 R545 R571

P501 P502

SURROUND AMPLIFIER BOARD

R835

R836 R897

P503

P801

P802

P803

ISC BOARD

R834

AMPLIFIER ADJUSTMENT

Idle Current

1. Rotate R522 fully clockwise.

2. Connect DC millivoltmeter to P501 (i.e. Across half of R523, 0.22 Ohm resistor).

3. Turn on the unit.

4. Adjust R522 for 1mV reading on voltmeter.

5. Leave power on for at least 5 min, and check for idle current again.

6. Repeat for other channels.

CHANNEL JUMPER VR

FL P503 R571
FR P502 R545
C P501 R522
SL P801 R835
SR P802 R836
BS P803 R897

ISC Sensitivity

1. Connect 8 ohm loading to all channels.

2. Rotate R881 fully clockwise.

3. Load all channels at full power using 1kHz sine wave.

4. At this time, monitor the THD of the SL,SR,BS output. Clipping should occur before full power achieved.

5. Rotate R834 counter-clockwise slowly until the THD just below 0.1%.

6. Repeat step 2-5 for R834 but monitor FL, FR & Center output.

7. The procedure is finish at this step.

8. Load all channels at full power using 1kHz sine wave with 4 ohm load.

9. The clipping power(at THD 0.1%) should less than 85W.

10

PCB LAYOUT

AUDIO BOARD - COMPONENT SIDE

AUDIO BOARD - COPPER SIDE

11

COMPONENT VIDEO BOARD - COMPONENT SIDE

COMPONENT VIDEO BOARD - COPPER SIDE

DIGITAL BOARD - COMPONENT SIDE SIDE

DIGITAL BOARD - COPPER SIDE

12

DSP BOARD - COMPONENT SIDE NLA

DSP BOARD - COPPER SIDE NLA

13

FRONT/CENTER AMPLIFIER BOARD

14

SURROUND AMPLIFIER BOARD

15

KEY BOARD/POWER SWITCH

- COMPONENT SIDE

KEY BOARD/POWER SWITCH

- COPPER SIDE

16

MAIN BOARD

17

MULTI-CHANNEL BOARD - COMPONENT SIDE

MULTI-CHANNEL BOARD - COPPER SIDE

18

POWER SUPPLY (STANDBY) / LED BOARD

ISC BOARD

- COMPONENT SIDE

ISC BOARD

- COPPER SIDE

19

PRE-OUT BOARD - COMPONENT SIDE

PRE-OUT BOARD - COPPER SIDE

RS-232 BOARD

- COPPER SIDE - COMPONENT SIDE

20

VIDEO 6 BOARD

TRIGGER BOARD

SPEAKER TERMINAL BOARD

SECONDARY BOARD

21

S-VIDEO BOARD

COMPOSITE VIDEO BOARD

22

SCHEMATIC DIAGRAM

AUDIO SWITCH

DTA144ESA

DTC144ESA

E C B

RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM.

NOTE:

1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%.

2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.

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