NAD T751 Service Manual

NAD T751 Service Manual
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Service Manual for NAD T751, downloadable as a PDF file.

We also have owner's manual to this model.

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The manual has 64 pages
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Available language versions: English
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Sample pages

NAD

SER

VICE

MANUAL

T 751

SURROUND

SOUND RECEIVER

751

SURROUND SOUND

RECEIVER

NAD

SER

VICE

MANUAL

T 751

SURROUND

SOUND RECEIVER

751

SURROUND SOUND

RECEIVER

SERVICE SAFETY PRECAUTIONS

Replacing the fuses

CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLY

WITH SAME TYPE OF FUSE.

Reference No

Part Number

Description

M751*AH

5120-0200-0

Fuse 5A 125V Time Lag 5x20 MM MITI/UL/CSA

M754*AH

5120-0052-0

Fuse 1.6A 250V Time Lag 5x20 MM UL/CSA

M752*C

5120-0024-0

Fuse 3.15A 250V Time Lag 5x20 MM SEMKO/VDE

NOTE:

<*AH > : USA, CANADIAN MODEL ONLY.

<*C > : EUROPEAN MODEL ONLY.

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

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8

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

ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12

IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-19

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-38

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39-46

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47-69

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71-72

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

SPECIFICATIONS

POWER AMPLIFIER AND PREAMPLIFIER SECTIONS

Rated distortion

(THD 20Hz-20 kHz FC/C/FR)

0.08%

(THD 20Hz-20 kHz SL/SR)

0.3%

Input Sensitivity

(ref. 8 ohms, 1 kHz)

180+/-30 mV

S/N Ratio

(A-wtd, 1KHz, 1W, 8 ohm)

-76 dB

(A-wtd, 1KHz, 70W, 8 ohm)

-90 dB

Frequency Response

(20 Hz - 20 kHz)

0 ± 0.8 dB

Channel Balance

(1 dB to -40 dB, 1 kHz)

2 dB

(-41 dB to -50 dB, 1 kHz)

3 dB

Audio muting at 1kHz

53 dB

Headphone O/P in 0.1%, 600 ohm load, CD in 500mV, 1 kHz

10V

Subwoofer out, 500mV in

(THD at 2V O/P, 100 Hz)

0.5%

(S/N at 2V O/P, 100 Hz)

80 dB

Crosstalk

(2V input, 10W, 1 kHz)

> -68 dB

Continuous average power output

70 W

Controls

Bass

(at 500mV in, 1W out, 100 Hz)

±9 dB

Treble

(at 500mV in, 1W out, 10 kHz)

±9 dB

SURROUND SECTION

Channel separation

I/p mode : L, R

: 1V in, 1 kHz, Ch R, L

45 dB

: o/p at unexpected, 1 kHz, Ch C

35 dB

I/p mode : L= -R

: 1V in, 1 kHz, Ch R, L

28 dB

: o/p at unexpected, 1 kHz, Ch C

30 dB

I/p mode : L= R

: 1V in, 1 kHz, Ch R, L

45 dB

: o/p at unexpected, 1 kHz, Ch SL, SR

30 dB

Frequency Response

I/p mode : L, R

: 1V in, 1W, Ch R, L

40Hz

0 ± 1.5 dB

20kHz

0 ± 0.8 dB

I/p mode : L= R

: 1V in, 1W, Ch C

300Hz

0 ± 0.8 dB

20kHz

0 ± 0.8 dB

I/p mode : L= -R

: 1V in, 1W, Ch SL, SR

30Hz

0 ± 1.0 dB

6.5kHz

-3 ± 1.0 dB

S/N Ratio ( 200mV in, 1, A-WTD w/ 1k 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 (2.2V in, 1W, w/ 80 kHz LPF, 1 kHz)

0.2%

AC-3/DTS SECTION

Frequency Response

FL, FR, C, SL, SR:

200Hz

0 ± 0.8 dB

20kHz

0 ± 0.8 dB

Distortion 1W all channels

0.08%

S/N 1 W ( CCIR/ARM, 200 Hz NOTCH & 400 Hz HPF)

85 dB

AM TUNER SECTION

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator

Usable sensitivity (999/1000kHz)

30 dBµ

S/N Ratio (5mV in)

38 dB

THD (5mV in)

IF Rejection (450 kHz)

36 dB

Image Rejection (F+2xIF)

28 dB

Selectivity

17 dB

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

*AH

Input level is expressed as the reading in open-circuit

of 75-ohm source impedance signal generator

Usable Sensitivity ( 98 MHz)

15 dBµ

Signal / Noise Ratio

Mono

72 dB

(60 dBµ, IHF wtd)

Stereo

66 dB

Frequency Response (20 Hz - 15 kHz, 60 dBµ)

0 ± 1.5 dB

Channel Separation (60 dBµ)

100 Hz

30 dB

30dB

1 kHz

38 dB

10 kHz

30 dB

Alternate Channel Selectivity

(40 dBµ, ±400 kHz)

60 dB

45 dB

Capture Ratio (40 dBµ)

3 dB

AM Suppression

(60 dBµ, 100% Mod.FM, 30% Mod.AM)

48 dB

Image Rejection (119.4 MHz)

85 db

40 dB

I.F. Rejection ( 10.7 MHz)

78 dB

65 dB

Pilot Suppression (60 dBµ)

60 dB

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

Mono

0.25%

Stereo

0.35%

Auto-Search Sensitivity

24 dBµ

Off

15 dBµ

RDS decode Sensitivity

26 dBµ

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth)

435 x 131 x 348mm

Net weight

12.27kg (27 lbs)

Shipping weight

13.63kg (30 lbs)

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

1. FM & AM ANTENNA

2. AM STEPPING FREQUENCY

3. TAPE 1 & CD INPUTS

4. 5.1 CHANNEL INPUTS

5. VIDEO 1 - VIDEO 4 (AUDIO & VIDEO) INPUTS

6. DIGITAL AUDIO INPUTS

7. AUDIO PRE-OUTS / SUBWOOFER OUT

8. MONITOR OUT

9. FRONT, CENTER & SURROUND SPEAKERS

10. SOFT CLIPPING

11. NAD-LINK INPUT/OUTPUT

12. SWITCHED POWER OUTLETS (*AH ONLY)

13. AC POWER CORD

14. COOLING FAN

1. POWER

2. STAND-BY

3. DISPLAY

4. FM MUTE / MODE

5. MEMORY

6. PRESET / TUNE

7. DOWN / UP

AND

8. VFL DISPLAY

9. VOLUME

10. HEADPHONE SOCKET & VIDEO 5 INPUT

11. AUDIO & VIDEO INPUT SELECTORS & SURROUND

MODE

12. BASS & TREBLE CONTROLS

751

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