NAD T752 Service Manual

Cover page of NAD T752 Service Manual

Service Manual for NAD T752, downloadable as a PDF file.

We also have owner's manual to this model.

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  • The manual has 63 pages
  • File size: 10.05 MB
  • Available language versions: English
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NAD
SERVICE
MANUAL
T
752
T 752
AV SURROUND
SOUND RECEIVER
A
V
SURROUND
SOUND
RECEIVER
DRAFT DATE: 08 OCT, 2002
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NAD
SERVICE
MANUAL
T
752
T 752
AV SURROUND
SOUND RECEIVER
A
V
SURROUND
SOUND
RECEIVER
DRAFT DATE: 08 OCT, 2002
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2
SAFETY INFORMATION
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3
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
33-0160001-00-48
Fuse 8A 250V Time Lag 5x20 MM UL/CSA
F751*C
33-0131002-00-48
Fuse 5A 250V Time Lag 5x20 MM SEMKO/VDE
F752*AH
33-0111006 -00-48
Fuse 1.6A 250V Time Lag 5x20 MM
UL/CSA/VDE/SEMKO
F752*C
33-0151006 -00-48
Fuse 800mA 250V Time Lag 5x20 MM
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 / FRONT PANEL VIEW ................................................................................................. 6
DISASSEMBLY INSTRUCTIONS ......................................................................................................... 7
WIRING DIAGRAM ............................................................................................................................... 8
BLOCK DIAGRAM ................................................................................................................................ 9
ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT ..................................................... 10
PCB LAYOUT ............................................................................................................................... 11 - 23
SCHEMATIC DIAGRAM .............................................................................................................. 24 - 36
IC BLOCK DIAGRAM ................................................................................................................... 37 - 45
EXPLODED VIEW .............................................................................................................................. 46
EXPLODED VIEW PARTS LIST .................................................................................................. 47 - 48
ELECTRICAL PARTS LIST .......................................................................................................... 49 - 58
PACKING DIAGRAM .......................................................................................................................... 59
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.
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4
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)
0.1 %
Input Sensitivity
(ref. 8 ohms, 1 kHz)
200 ± 20 mV
S/N Ratio
(A-wtd, 1kHz, 1 W, 8 ohm, SL/SR)
- 80 dB
(A-wtd, 1kHz, 80 W, 8 ohm, SL/SR)
- 96 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 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)
-70 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 Response @ 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 Config.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
65 dB
Audio LPF
70 dB
A-wtd
70 dB
Channel Separation
(1 W, 20 kHz LPF)
Track 65 997 Hz
75 dB
DOLBY PRO LOGIC II SECTION
Frequency Resporse
I/P mode : L, R
: 1 V in, 1 W, Ch L/R
40 Hz
0 ± 1.5 dB
20 Hz
0 ± 0.8 dB
I/P mode : L, R
: 1 V in, 1 W, Ch C
300 Hz
0 ± 0.8 dB
20 Hz
0 ± 0.8 dB
I/P mode : L, R
: 1 V in, 1 W, Ch SL/SR
40 Hz
0 ± 1.5 dB
20 Hz
-3 ± 1.0 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 %
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5
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)
30 dB
THD
(5 mV in)
3 %
IF Rejection
(450 kHz)
36 dB
Image Rejection
(F+2xIF)
28 dB
Selectivity
17 dB
Output
110 ± 20 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 dB
uv
15 dBuv
S/N Ratio
(60 dB, IHF wtd)
Mono
65 dB
65 dB
Stereo
60 dB
60 dB
Frequency Response
(20 Hz - 15 kHz, 60 dBm)
0 ± 1.5 dB
0 ± 1.5 dB
Channel Separation
(60 dBm)
100 Hz
30 dB
30 dB
1 Hz
35 dB
35 dB
10 Hz
20 dB
25 dB
Alternate Channel Selectivity (40 dBm, ± 400 kHz)
60 dB
45 dB
Capture Ratio
(40 dBm)
3 dB
3 dB
AM Suppression (60 dBm, 100% Mod. FM, 30% Mod. AM)
40 dB
40 dB
Image Rejection
(119.4 MHz)
65 dB
65 dB
I.F. Rejection
(10.7 MHz)
78 dB
65 dB
Pilot Suppression
(60 dBm)
60 dB
60 dB
THD (60 dBm, L=R 75 kHz for AH, 40 kHz Dev for C)
Mono
0.8 %
0.8 %
Stereo
1 %
1 %
Auto-Search Sensitivity
On
24 dB
uv
24 dB
uv
Off
15 dB
uv
15 dB
uv
RDS decode Sensitivity
26 dB
uv
-
PHYSICAL SPECIFICATIONS
Dimensions (Width x Height x Depth)
435 x 133 x 349 mm
Net Weight
14.40 Kg (31.68 lbs)
Shipping Weight
16.00 Kg (35.20 lbs)

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