NAD T742 Service Manual

NAD T742 Service Manual
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Service Manual for NAD T742, downloadable as a PDF file.

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The manual has 66 pages
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NAD

T 742

SURROUND

SOUND RECEIVER

742

SURROUND SOUND

RECEIVER

SER

VICE

MANUAL

NAD

T 742

SURROUND

SOUND RECEIVER

742

SURROUND SOUND

RECEIVER

SER

VICE

MANUAL

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

M270

*AH

5120-0200-0

5A TIME-LAG 5x20 UL/CSA

M271

5120-0024-0

3.15A TIME-LAG 5x20 VDE-SEMKO

M272

*AH

5120-0052-0

1.6A TIME-LAG 5x20 UL/CSA

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11

INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13

IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-24

SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-42

IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-51

ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52-71

EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-74

PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

SPECIFICATIONS

POWER AMPLIFIER AND PREAMPLIFIER SECTION (all channels stated 8 ohms)

Rated distortion

(THD 20Hz-20 kHz FL/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)

-78 dB

(A-wtd, 1KHz, 80W, 8 ohm)

FL/FR/C

92 dB

SL/SR

-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 (L/R/C RL/RR 8 ohms)

50 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 ± 1.5 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%

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%

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)

45 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

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

1 kHz

40 dB

10 kHz

30 dB

Alternate Channel Selectivity

(40 dBµ, ±400 kHz)

60 dB

Capture Ratio (40 dBµ)

3 dB

AM Suppression

(60 dBµ, 100% Mod.FM, 30% Mod.AM)

48 dB

Image Rejection (119.4 MHz)

68 db

I.F. Rejection ( 10.7 MHz)

78 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

POWER RATING

EUROPEAN Model

AC 230V~ 50Hz 1.2A

USA, CANADIAN Model

*AH

AC 120V~ 60Hz 2.5A

PHYSICAL SPECIFICATIONS

Dimensions (Width x Height x Depth)

435 x 131 x 348mm

Net weight

14kg (31 lbs)

Shipping weight

16.7kg (37 lbs)

REAR PANEL / FRONT PANEL

REAR PANEL

FRONT PANEL

1. FM & AM ANTENNA

2. TAPE 1 & CD INPUTS

3. 5.1 CHANNEL INPUTS

4. DVD - SAT VCR - VIDEO 4 (AUDIO &

VIDEO)

5. DIGITAL AUDIO INPUTS

6. AUDIO PRE OUTS / SUBWOOFER OUT

7. MONITOR OUT

8. SPEAKERS: FRONT, CENTER & SUR-

ROUND SPEAKERS

9. SOFT CLIPPING

10. IR INPUT

11. AC POWER CORD

12. 12 VOLT TRIGGER OUT

1. POWER

2. STAND-BY INDICATOR

3. DISPLAY

4. FM/AM

5. FM MUTE / MODE

6. MEMORY

7. PRESET / TUNE

8. DOWN / UP

AND

9. VFL DISPLAY

10. VOLUME & SETUP

11. HEADPHONE SOCKET & VIDEO 5 INPUT

12. AUDIO & VIDEO INPUT SELECTORS

13. CD

14. TAPE MONITOR

15. EXT. 5.1

16. SURROUND MODE

17. SET UP

18. TONE CONTROLS

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