NAD T762 User manual

NAD
SERVICE MANUAL
T 762
T 762
AV SURROUND
SOUND RECEIVER
AV SURROUND SOUND RECEIVER
DRAFT DATE: July 08

2
SAFETY INFORMATION

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 33-0191001-00-88 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
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 - 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
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.

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/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) ≥≥
≥≥
≥- 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 (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 ≥≥
≥≥
≥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 ≥≥
≥≥
≥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 %

5
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 ≤≤
≤≤
≤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 10.5 ± 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 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)

6
1 2 3456 7 89
21 20 1119 12 13 14 15 16 17 18
10
FRONT PANEL
REAR PANEL / FRONT PANEL VIEW
REAR PANEL
1. FM & AM ANTENNA
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 &
COMPONENT VIDEO OUT
10. DIGITAL AUDIO INPUT &
DIGITAL AUDIO OUTPUT
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
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. DIGITALAUDIO SELECTOR
14. EXT. 7.1
15. SURROUND MODE
16. LEVELS
17. TONE CONTROLS
18. TONE DEFEAT
19. SPEAKERS A & B
20. VIDEO 6 INPUT
21. PHONES

7
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.
1
4
5
6
7
8
9
10
2
3
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.
Figure No. 1
12
11
11
Figure No. 2

8
THERM
S
EN
S
N
O
R
U
L VER
S
I
O
N :
USE J758
,
J759
C
E VER
S
I
O
N :
US
E
J
7
60
MOU
NT
O
N
C
HA
SS
I
S
GND
8
2-
03
2
6
1
35
-
0
7-
98
C
ABLE A
SS
Y
3
WAY
S
#
2
6
U
L2
8
77
L
=1
50
36
-2
8
2
8
2
0
1-71-X
X
F
F
C
C
ABLE 2
8
PIN
S
P
1.2
5
L=2
00
mm
36
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8
2
8
2
0
1-71-XX
F
F
C
C
ABLE 2
8
PIN
S
P1.2
5
L
=2
00
mm
C
ABLE A
SS
Y 2 WAY
S
2.
5
P
U
L1
533
L=
5
4
0
mm
8
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42
6
1
35
-
03
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C
ABLE A
SS
Y 4 WAY
S
2.
5
P
U
L24
68
L=
5
4
0
mm
36
-172
8
2
0
1-71-XX
F
FC CABLE 17 PIN
S
P1.2
5
L=2
00
mm
36
-2
0
2
8
121-71-XX
F
FC CABLE 2
0
PIN
S
P1.2
5
L=12
0
mm
8
2-122
6
1
35
-
05
-X
X
C
ABLE A
SS
Y 12 WAY
S
#
2
6
U
L2
8
77 L=
50
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8
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2
6
1
35
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1-XX
C
ABLE A
SS
Y 10 WAY
S
#26 2.5P
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77 L=
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TO
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8
2-
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2
6
1
35
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C
ABLE A
SS
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8
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S
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TO
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TO
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8
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42
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1
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1-XX
C
ABLE A
SS
Y 4 WAY
S
#
2
6
2.
5
P
U
L2
8
77 L=
500
mm
8
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2
6
1
35
-
03
-XX
C
ABLE A
SS
Y
6
WAY
S
#
2
6
U
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8
77 L=4
80
mm
8
2-
08
2
6
1
35
-
03
-XX
C
ABLE A
SS
Y
8
WAY
S
#
2
6
U
L2
8
77
L
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50
mm
8
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2
6
1
35
-
08
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C
ABLE A
SS
Y
3
W
AY
S
#
2
6
U
L2
85
4
L
=
300
mm
8
2-
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11
6
4
35
-
0
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C
ABLE A
SS
Y 1 WAY
S
#
1
6
U
L1
6
72
B
R
O
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00
mm
8
2-
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11
6
4
35
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C
ABLE A
SS
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S
#
1
6
U
L1
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72
B
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mm
8
2-12261
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C
ABLE A
SS
Y 12 WAY
S
#
2
6
2.
5
P
U
L2
8
77 L=24
0
mm
8
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6
1
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4-XX
C
ABLE A
SS
Y
3
WAY
S
#
2
6
2.
5
P
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8
77 L=4
00
mm
F
R
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S
F
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8
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2
6
1
35
-
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C
ABLE A
SS
Y
6
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S
#
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6
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5
P
U
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L
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350
mm
8
2-
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2
6
1
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-
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SS
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6
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S
#
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6
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1
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2
35
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C
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SS
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8
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S
#
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8
3
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96
P
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72 L=1
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mm
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1
35
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2
.
5
P
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8
77 L=42
0
mm
8
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C
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SS
Y
3
WAY
S
#
1
8
3
.
96
P
U
L1
0
1
5
L=24
0
mm
8
2-0518235-05-XX
,
CABLE ASSY 5
(
R/BR/O
)
8
2-0518235-04-XX
,
CABLE ASSY 5
W
AY
S
#
1
8
3
.
96
P
U
L1
00
7
L
=250mm
(
V/BL/Y
)
8
2-
06
2
6
1
35
-
05
-XX
C
ABLE A
SS
Y
6
WAY
S
#
2
6
2.
5
P
UL2877 L=120mm
8
2-
0
41
8
2
35
-
0
1-XX
C
ABLE A
SS
Y 4 WAY
S
#
1
8
3
.
96
P
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L
100
7 L=2
80
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35
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ABLE A
SS
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S
#
1
8
3
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96
P
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8
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3
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S
#
1
8
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96
P
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1
5
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8
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6
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-XX
C
ABLE A
SS
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S
#
2
6
2.
5
P
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77 L=2
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8
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1
35
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C
ABLE A
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S
#
2
6
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5
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S
#
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6
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ABLE A
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S
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6
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2-0418235-02-XX
,
CABLE ASSY 4
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AY
S
#
1
8
3
.
96
P
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6
72 L=1
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C
C
C
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C
C
C
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8
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35
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3
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S
#
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3
.
96
P
U
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1
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350
mm
C
C
C
C
C
C
K
EYB
O
ARD
M
AIN B
O
ARD
BO
ARD
J
7
15A
J
71
9
A
J
71
8
A
J
72
0A
3
A
J
717A
J
7
08A
J50
2B
J
721
A
J
7
09
A
J
2
03
J
2
0
4B
J350
B
J90
1
B
BO
ARD
DS
P B
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J60
4B
J
71
5
B
J
1
009
B
J
1
0
1
0
B
L
ED B
O
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PSU
B
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ARD
CO
MP
O
NENT VIDE
O
BO
ARD
D
I
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ITAL B
O
ARD
A
U
DI
O
B
O
ARD
V
IDE
O
B
O
ARD
S
PEAKER
A
BO
ARD
S
PEAKER
BO
ARD
TU
NER
P
RE-
OU
T B
O
ARD
MU
LTI-
C
HANNEL
BO
ARD
J611
A
J6
1
5
B
J6
14B
J
7
06
A
J6
14A
J6
1
5
A
J
71
9
B
J
71
8
B
J
712B
J
414A
ISC
B
O
ARD
J80
2A
J80
1A
J58
1A
J
7
8
2A
J58
2
A
J8
11B
J
7
05
B
S
-VIDE
O
B
O
ARD
A
MP 2 B
O
ARD
A
MP 1 B
O
ARD
M506
J505
A
J
7
8
1B
J503
B
J90
1A
J
7
53
A
J
7
5
4B
J
7
5
1B
J50
4A
J50
1A
J757
J756
J
6
1
_
L
J
7
60
J803
A2
J803
A1
WIRING DIAGRAM
J
71
3
B
J
714B

9
OS
D
L
C747
63
Pin
1
4
A
C
O
ut
Speaker Output Output Speaker
Pin ( ST/MO, Mute, S Meter )
CE/Data/Clk, RDSbus
V
FD Driver
CPU
Stereo mode
AC3 mode
Multi Ch in
by
CP
U
co
ntr
o
l
4966
VFD
by
CP
U
4966
co
ntr
o
l
Speaker Output
AUDIO MS
4966
co
ntr
o
l
by
CP
U
co
ntr
o
l
by
CP
U
4966
MS
V
IDE
O
OU
T
C
D
V
1
V2
V
3
V3
V4
V4
V5
TC9
27
3
N
D/
A
CS
-4
93
2
6
DS
P
EPROM
FL
C
onfi
g
S
ele
c
t
o
r
FR
L
R
SL SR BSL BSR FL FR
SELECTOR
VOLUME
M62446
ELECT
TREBLE
BASS
MUTE MUTE MUTE MUTE
MULTI-CH
OUT
FL FR C
POWER
AMP AMP
POWER
SL SR
CS533
1
DIR
CS
-
8
41
5
CO
AXIAL 1
CO
AXIAL 2
CO
AXIAL
3
A
/
D
7
4L
S
1
5
7
L
R
PROTECT
C
P
U
S
tand-b
y
CPU CPU
OU
T
C
P
U
C
P
U
C
P
U
TC-9164AN
CPU
SL
FRONT
1 2 3 4
BSL BSR
FR FL
MULTI-CH
IN
CPU CPU CPU CPU
TU
NER
OU
T
D
i
g
ital/
A
nalo
g
s
ele
c
t
o
r
S
C
S
R
S
L
V
i
d
e
o
S
ele
c
t
o
r
B
A-7
6
2
5
FL FR
Relay Relay Relay
SL
SR
C
Encoder
Volume
Sensor
Remote
K
e
y
M
atrix
Board
Tuner
LED
Supply
Power
Relay
AC Input
Main
S
tand-b
y
Po
wer
S
uppl
y
+5
V CP
U
A
C In
p
ut
C
P
U
LA1837 + LC72131 +
BU1924
LR
FL
FR
CS
4
3
4
0
D/
A
D/
A
B
a
ss
R
e-
d
ire
c
t
C
P
U
CS
R
E
S
ET
A
B
OO
T
D
ATA
OU
T
C
L
O
CK
OU
T
A
1
6
A17
C
L
O
CK
OU
T
D
ATA
OU
T
M27C020
C
B
F0
F1
F
2
E0
E2
AT24C02
EEPRO
-
00
4
T
APE
IN
CS
4
3
4
0
TAPE
OU
T
96/
24
96/
24
96/
24
O
PTICAL
V6
SR
BSL
BSR ELECT
M62446
VOLUME
MUTE
CPU
SUB
3
CPU
2
C
MUTE
Relay
CPU
POWER
AMP
BSL
BSR BSL
96/24
CS4340
D/A
IR
I
n
/O
ut
CPU
LC
4
966
7
4H
C
1
53
O
PTICAL
OU
T
CO
AXIAL
OU
T
C
P
U
O
N
LED
P
r
o
te
c
t
LED
LC4966
P
ower-Down
D
ete
c
t
MUTE
CPU
BSR BSL
BSL
Head phone
control to CPU force 2 channel
L-CH
MS LINE-AMP MS LINE-AMP
R-CH
MSL
MSR
V3
V4
V6
C
D
V5
TU
NER
C
P
U
OU
T
IN
TAPE
TAPE
V3
V4
OU
T
V1
V
2
OU
T
T
C
9
27
3
N
-
00
4
MS
LM
S
R
S
elector
L
C4
966
B
A-7
6
2
5
V
i
d
e
o
L-CH R-CH
BLOCK DIAGRAM
U202 VFD U201 A/V-R

10
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.
ADJUSTMENT POINT DIAGRAM
R522 R545 R571
P501 P502
P503
R835
P801
R836 R897
P803
P802
R834
FRONT/CENTER AMPLIFIER BOARD
SURROUND AMPLIFIER BOARD
ISC BOARD

11
PCB LAYOUT
AUDIO BOARD - COMPONENT SIDE
AUDIO BOARD - COPPER SIDE

12
COMPONENT VIDEO BOARD - COMPONENT SIDE
COMPONENT VIDEO BOARD - COPPER SIDE
DIGITAL BOARD - COMPONENT SIDE SIDE
DIGITAL BOARD - COPPER SIDE

13
DSP BOARD - COPPER SIDE NLA
DSP BOARD - COMPONENT SIDE NLA

14
FRONT/CENTER AMPLIFIER BOARD

15
SURROUND AMPLIFIER BOARD

16
KEY BOARD/POWER SWITCH
- COMPONENT SIDE
KEY BOARD/POWER SWITCH
- COPPER SIDE

17
MAIN BOARD

18
MULTI-CHANNEL BOARD - COMPONENT SIDE
MULTI-CHANNEL BOARD - COPPER SIDE

19
POWER SUPPLY (STANDBY) / LED BOARD
ISC BOARD
- COMPONENT SIDE
ISC BOARD
- COPPER SIDE

20
PRE-OUT BOARD - COPPER SIDE
PRE-OUT BOARD - COMPONENT SIDE
RS-232 BOARD
- COPPER SIDE - COMPONENT SIDE