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1、NAD T 741 SURROUND SOUND RECEIVER T 741 SURROUND SOUND RECEIVER SERVICE MANUAL RadioFans.CN 收音机爱 好者资料库 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 NoPart NumberDescription M271 *C 5120-00
2、24-03.15A TIME-LAG 5x20 VDE-SEMKO NOTE: : USA, CANADIAN MODEL ONLY. : 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 the supply cir
3、cuit. 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 DESCRIPTIONPAGE SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . .3-4 REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 WIRING DIAGRAM . . . . . . . . . . . . . . .
5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-8 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、 . . . . . . . . . . . . .10-11 INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13 IMPORTANT NOTES . . . .
7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-24 SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . .
8、 . . . . . . . . . . . . . . . . . . . . . . . . . . .25-42 IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43-51 ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9、. .52-71 EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72 EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-74 PACKING DIAGRAM . . . . . . . . . . . . . .
10、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75 RadioFans.CN 收音机爱 好者资料库 3 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 oh
11、ms, 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
12、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 SECT
13、ION 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
14、I/p mode : L, R: 1V in, 1W, Ch R, L40Hz0 1.5 dB 20kHz0 1.5 dB I/p mode : L= R: 1V in, 1W, Ch C300Hz0 0.8 dB 20kHz0 0.8 dB I/p mode : L= -R: 1V in, 1W, Ch SL, SR30Hz0 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,
15、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:200Hz0 0.8 dB 20kHz0 0.8 dB Distortion 1W all channels0.08% RadioFans.CN 收音机爱 好者资料库 4 AM TUNER SECTION Input level is expressed as the reading in open-circ
16、uit of 75-ohm source impedance signal generator Usable sensitivity (999/1000kHz) 30 dB S/N Ratio (5mV in) 38 dB THD (5mV in) 3% IF Rejection (450 kHz) 36 dB Image Rejection (F+2xIF) 28 dB Selectivity 17 dB Output130+/- 20mV Loop sensitivity (20dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 k
17、Hz 66 dB Frequency response (100 - 2.3 kHz, 5mV) 6 dB FM TUNER SECTION*C Input level is expressed as the reading in open-circuit of 75-ohm source impedance signal generator Usable Sensitivity ( 98 MHz) 15 dB Signal / Noise RatioMono 72 dB (60 dB, IHF wtd)Stereo 66 dB Frequency Response (20 Hz - 15 k
18、Hz, 60 dB)0 1.5 dB Channel Separation (60 dB)100 Hz 30 dB 1 kHz 40 dB 10 kHz 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB Capture Ratio (40 dB) 3 dB AM Suppression (60 dB, 100% Mod.FM, 30% Mod.AM) 48 dB Image Rejection (119.4 MHz) 68 db I.F. Rejection ( 10.7 MHz) 78 dB Pilot Suppressio
19、n (60 dB) 60 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C) Mono 0.25% Stereo 0.35% Auto-Search SensitivityOn 24 dB Off 15 dB RDS decode Sensitivity 26 dB POWER RATING EUROPEAN Model*CAC 230V 50Hz 1.2A USA, CANADIAN Model*AHAC 120V 60Hz 2.5A PHYSICAL SPECIFICATIONS Dimensions (Width x Height x
20、Depth)435 x 131 x 348mm Net weight14kg (31 lbs) Shipping weight16.7kg (37 lbs) 5 1 234567 89101112 1.FM & AM ANTENNA 2.TAPE 1 & CD INPUTS 3.5.1 CHANNEL INPUT 4.VIDEO 1 - VIDEO 4 (AUDIO & VIDEO) 5.NAD-LINK INPUT / OUTPUT 6.DIGITAL AUDIO INPUTS / OUTPUTS 7.12V TRIGGER INPUT 8.AUDIO PRE OUTS 9.MONITOR
21、OUT 10. SOFT CLIPPING 11. SPEAKERS: FRONT, CENTER & SURROUND SPEAKERS 12. AC POWER CORD 1.POWER 2.STAND-BY 3.AM/FM 4.DISPLAY 5.FM MUTE / MODE 6.MEMORY 7.PRESET / TUNE 8.DOWN / UPAND 9. VFL DISPLAY 10. VOLUME & SETUP 11. HEADPHONE SOCKET & VIDEO 5 INPUT 12. VIDEO 1 VIDEO 5 INPUT 13. CD 14. TAPE MONIT
22、OR 15. EXT. 5.1 16. SURROUND MODE 17. SET UP 18. TONE CONTROLS 123456789 1112131415161718 10 REAR PANEL / FRONT PANEL REAR PANEL FRONT PANEL 6 DISASSEMBLY INSTRUCTIONS 1. Remove machine screws M 4.0 x 6.0 ( 1 to 6 ) from the side panels. Remove tapping screw 3.0 x 8.5 ( 7 )from the back panel. Refer
23、 to Figure No.1. Figure No.1 2. Pull both sides of the TOP COVER slightly outwards 8 and tilt approx. 35 and then remove in the direction as indicated by the arrow 9 . Refer to Figure No.2. Figure No.2. 7 6 5 1 3 2 4 9 8 8 87 P702 P701 POWER SWITCH PCB J401A AC3 PCB J203B J101A J604B J601B J208A J20
24、8B J203A J206AJ207A J207B SECONDARY PCB J701AJ202BJ206A JP210 JP211 J702B JP210 J602B T201AT202A JP207 JP206 M704B C230 JP209 JP203 J206B JP204 JP205 C221 P261P260P262 J101B J201B P264 PSU PCB P266 P265 DIGITAL PCB P261 SPEAKER PCB P262P260 POWER CORD L N M705A JP212B J206B J705B J702A J701B MAIN PC
25、B -35V J705B J602A J601AJ706B +35V GND J401B M708A M707A J604A J704A J706B J709B J714A J716A J715A J710B JP207B J703A J710BJ709B J704B J703B J715B J714B J716B VIDEO 5 PCB POWER LED PCB KEYBOARD J202AJ201A VOL PCB S-VIDEO PCB PRIMARY PCB AMPLIFIER PCB SURROUND MULTI CHANNEL PCB TUNER PCB AUDIO PCB VI
26、DEO PCB SHOWN THE PIN 1 OF WIRE HARNESS SHOWN THE WAFERS SHOWN THE SOLDER END OF HARNESS NOTES : WIRING DIAGRAM 910 OSCRF VT BLOCK DIAGRAM COAXIAL x2 OPTICAL x1 74HC153 4053 74LS157 M62446FP S-Video Selector CD4052 TEMPERATURE PROTECTION TUNER L TUNER R POWER DOWN Detect Pin. For SPK off, Mute ON, V
27、FD off. SPK. A and B FL Trigger out FL OUT2 OUT3 OUT1 OUT4 FR CENTER SL SR SUB FR CENTER SL SR SUB Video?Pin 1 IN?13 2 IN?12 3 IN?15 4 IN?14 5 IN?1 3 OUT?3 4 OUT?3 S-Video?Pin ?C?Y 1 IN?11?4 2 IN?12?1 3 IN?15?2 3 OUT? 13?3 Video Selector CD4051 ADJUSTMENT POINTS DIAGRAM 1. TUNER 2. IDLE CURRENT - Fr
28、ont Amplifier & Surround Amplifier Board 11 12 ALIGNMENT PROCEDURES AMPLIFIER SECTION Idle Current StepItemConnectionAdjustment Adjust for 1Front Left ChannelVoltmeter to M714 on Main BoardVR77031mV0.2mV 2Front Right ChannelVoltmeter to M713 on Main BoardVR77021mV0.2mV 3Center ChannelVoltmeter to M7
29、12 on Main BoardVR77011mV0.2mV 4Rear Left ChannelVoltmeter to TP202 on Surround Amplifier BoardVR2021mV0.2mV (PCB N0A00C-AMP2) 5Rear Right ChannelVoltmeter to TP201 on Surround Amplifier BoardVR2011mV0.2mV (PCB N0A00C-AMP2) INSTRUMENT SETUP 1. FM MEASUREMENT Fig. 1 Fig. 2 2. RDS MEASUREMENT Fig. 3 3
30、. AM MEASUREMENT Fig. 4 FM SIGNAL GENERATOR ANTENNA TERMINAL OUTPUT TERMINAL DISTORTION ANALYZER DISTORTION ANALYZER AC VOLTMETER OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE AC VOLTMETER OR OSCILLOSCOPE OUTPUT TERMINAL OUTPUT TERMINAL L R ANTENNA TERMINAL ANTENNA TERMINAL ANTENNA TERMINAL AM LOOP ANTE
31、NNA (Accessory) AM LOOP ANTENNA 60cm DIGITAL MILLIVOLT METER VT-J954 FM SIGNAL GENERATOR AM SIGNAL GENERATOR FM SIGNAL GENERATOR RDS GENERATOR FM STEREO GENERATOR P-901 DC MILLIVOLT METER UNIT UNIT UNIT UNIT 13 FM/RDS SECTION - FM mono:1kHz, 75kHz devi., 60dB/V - FM stereo:1kHz, 67.5kHz devi., 60dB/
32、V Pilot signal 19kHz 7.5kHz devi. OUTPUTS - Connect the non-inductive type resistor of 8 ohms to the all speaker terminals unless otherwise noted. Item FM IF/RF Stereo Distortion Stereo Separation Muting Level Signal output Step 1DC voltmeterL9410100mV 3 Distortion analyzer Distortion analyzer Oscil
33、loscope Oscilloscope L942 R956 R941 Minimum Minimum 2AC voltmeter IFT on the front end IFT on the front end Maximum Maximum separation Connection of instrument Fig.1 Fig.2 Fig.2 Fig.1 Channel L or R 1kHz 99.0MHz 1kHz 75kHz devi. 65dBf (60dB) 99.0MHz Ext. mod. 65dBf (60dB) FM SG output Stereo mod- ul
34、ator output Tuning frequency 99.0MHz 99.0MHz Channel L or R 1kHz 99.0MHz Ext. mod. 65dBf (60dB) 99.0MHz Ext. mod.65dBf(60dB) RDS 2% MOD 99.0MHz 18dB 99.0MHz 99.0MHz RDS Fig.399.0MHz Output indicator Adjustment point Adjust for Remarks FM MUTE/MODE switch: ON/AUTO Repeat the steps 1 to 3 until no fur
35、- ther adjustment is necessary. FM MUTE/MODE switch: ON/AUTO Dont turn more than +/-180 Repeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum. Decode the RDS- Program Station. AM SECTION AM Modulation:400Hz, 30% For AH Version Step 1 2 3 530kHz 600kH
36、z 990kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block L971 RF coil on RF block L971 Adjust for 1.350.2V Maximum Maximum Step 1 2 3 522kHz or 531kHz 60
37、3kHz 999kHz 600kHz 400Hz 30% mod. 60dB/m AM SG output Tuning frequency Output indicator Adjustment point 600kHz 400Hz 30% mod. 60dB/m AC voltmeter AC voltmeter Digital DC voltmeter L972 OSC coil on RF block L971 RF coil on RF block L971 Adjust for 1.30.2V (522kHz) 1.350.2V (531kHz) Maximum Maximum F
38、or C Version IMPORTANT NOTES 1. Show the software ver- sion Press “FM/AM” and “EXT 5.1”. 2. Light up all the icon on the VFL. Press “FM/AM” and “TONE CONTROL”. 3. Toggle between 9K and 10K Press “FM/AM” and “CD”. 4. Clear all tuner presets Press “TAPE(MON)” and “VIDEO 1”. 14 PCB LAYOUT S-VIDEO BOARD
39、 VIDEO-5 BOARDVOLUME BOARD 15 VIDEO BOARD TUNER BOARD 16 SURROUND AMPLIFIER BOARDPRIMARY BOARD SECONDARY BOARD 17 AUDIO BOARD PSU BOARD 18 MULTI-CHANNEL BOARD - COMPONENT SIDE 19 MULTI-CHANNEL BOARD - SOLDER SIDE 20 MAIN BOARD 2221 AC3 BOARD - COMPONENT SIDEAC3 BOARD - SOLDER SIDE 2324 KEY BOARD DIG
40、ITAL BOARD SPEAKER BOARD LED BOARDPOWER SWITCH BOARD 2625 SCHEMATIC DIAGRAM AC3 / DTS NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/10W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 2728 MAIN NOTE: 1. RESISTORS, ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIF
41、IED. MF-METAL FILM 2. CERAMIC CAPACITORS, ARE 50V 10%. UNLESS OTHERWISE SPECIFIED. 3029 ( FROM AC3 J601B ) OUT1 OUT2 OUT3 OUT4 AVDD SWIN GNDS SRIN SLIN GNDC CIN GNDR RIN GNDL BYR BYL DVDD CLK DATA LATCH DGND AGND SWOUT SROUT SLOUT COUT ROUT LOUT AVSS1 AVSS2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
42、18 19 20 2122 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 LIN U605 M62446P VSS LS1 LS2 LS3 LS4 LS5 LS6 LS7 LS8 LCOM1 LCOM2 LCOM3 ST GND VDD RS1 RS2 RS3 RS4 RCOM1 RCOM2 RCOM3 RS5 RS6 RS7 RS8 DATA CKL 1 2 3 4 5 6 7 8 9 10 11 12 13 1415 16 17 18 19 20 21 22 23 24 25 26 27 28 U604 TC9164
43、 R613 33K AGND AGND AGND AGND AGND C607 100p R614 33KR616 10K R615 10K C608 220p FL FR C SL SR SUB AGND R617 33K C609 100p R618 33K R620 10K R619 10K C610 220p R626 12K C612 0.01u R627 39K R629 20K R628 20K C611 22u/16V R630 6K8 R631 6K8 D601 IN4148 +12V C613 220u/16V R625 10K -12v Q602 DTA114ES Q60
44、1 DTC114ES Q603 2SC2878 Q604 2SC2878 C614 22u/16V C615 22u/16V R621 10K R623 10K R622 10K R624 10K C601 100p R601 330R R602 100K C602 100p R603 330R R604 100K M601A SUB M601B C M601C SL M601D SR M601E FL M601F FR C603 100p R605 330R R606 100K C604 100p R607 330R R608 100K C605 100p R609 330R R610 10
45、0K C606 100p R611 330R R612 100K 1 2 3 4 5 6 7 8 9 10 J706B STE IN FL AGND FR +12V -12V D_DGN DATA CLK STB LATCH C688 0.022u C687 0.022u C634 153 C635 822 C619 4.7u/16v C620 4.7u/16v C621 4.7u/16v C622 4.7u/16v C623 4.7u/16v C624 4.7u/16v C626 22u/10V C627 22u/10V C628 22u/10V C625 22u/10V R637 100k
46、 R636 100k R635 100k R634 100k R633 100k R632 100k C618 3u3/16V C617 3u3/16V C633 0.33u/50V C636 0.33u/50V C637 153 C638 822 C639 3u3/16V C640 3u3/16V C681 47u/16V D604 7V5 Q607 KTC8550 R641 1K C682 47u/16V -12V R662 56K R663 1K5 R66422K R665 470R C657 220p C658 100p C659 10u/50V Q614 C2878 R666 470
47、R Q615 C2878 R6702K R6712K Q613 DTA114ES R667 56K C660 10u/16V C642 3u3/50V R642 56K R643 1K5 R6447K5 C643 220p C644 100p C645 10u/50V Q609 C2878 R659 2K Q608 DTA114ES R647 56K C649 3u3/50V R650 56K R651 1K5 R6527K5 C650 220p C651 100p C652 10u/50V Q611 C2878 R660 2K C646 100p C653 100p C675 3u3/50V
48、 R692 56K R693 1K5 R6947K5 C676 220p C677 100p C678 10u/50V Q622 C2878 R6100 2K Q621 DTA114ES R697 56K C662 3u3/50V R672 56K R673 1K5 R6747K5 C663 220p C664 100p C665 10u/50V Q617 C2878 R689 2K Q616 DTA114ES R677 56K C669 3u3/50V R680 56K R681 1K5 R6827K5 C670 220p C671 100p C672 10u/50V Q619 C2878
49、R690 2KR685 56K C666 220p C673 220p M602A SUB OUT M602B C OUT M602C SL OUT M602D SR OUT M602E FL OUT M602F FR OUT R668 100K R669 220R FL FR C AGND AGND 1 2 3 J602A SR SL AGND Q605 KTC8050 D602 7V5 C629 47u/16V R638 1K L601 100uH C630 47u/10V Q606KTC8050 D603 5V6 C631 47u/16V R640 1K C632 47uF/10V L602 100uH C641 0.1u ( FROM MAIN J706A ) ( TO SURR J602B ) (TO MAIN J705A ) 5.1 IN +12V 1 3 2 - + U601A NJM5532 7 5 6 - + U601B NJM5532 4 8 U601C NJM5532 1 3 2 - + U602A NJM5532 7 5 6 - + U602B NJM5532 4 8 U602C NJM5532 1 3 2 - + U603A 4558 7 5 6 - + U603B 45
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