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1、NAD SERVICE MANUALT 753 T 753 Surround Sound Receiver Surround Sound Receiver DRAFT DATE: 20 FEB 2004RadioFans.CN 收音机爱 好者资料库 2 SAFETY INFORMATION AH VERSION C VERSION RadioFans.CN 收音机爱 好者资料库 3 SERVICE SAFETY PRECAUTIONS 1. Replacing the fuses CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIR
2、E REPLACE ONLY WITH SAME TYPE OF FUSE. Reference DesignatorPart NumberDescription F751*AH33-0191001-00-88Fuse 10A 250V Time Lag 5x20 MM UL/CSA F751*C33-0181006-00-88Fuse 6.3A 250V Time Lag 5x20 MM UL/CSA/SEMKO/VDE F752*AH33-0111006-00-48Fuse 1.6A 250V Time Lag 5x20 MM UL/CSA/VDE/SEMKO F752*C33-01510
3、06-00-48Fuse 800mA 250V Time Lag 5x20 MM UL/CSA/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 insu
4、lated from supply circuit. CONTENTS DESCRIPTIONPAGE SPECIFICATIONS. 4 - 5 REAR PANEL / FRONT PANEL VIEW . 6 DISASSEMBLY INSTRUCTIONS . 7 WIRING DIAGRAM. 8 BLOCK DIAGRAM. 9 SPECIAL FUNCTION . 10 DETAILS & WAVEFORMS ON SYSTEM & TEST & DEBUGGING . 10 ADJUSTMENT POINTS DIAGRAM / AMPLIFIER ADJUSTMENT .11
5、 PCB LAYOUT . 12 - 26 SCHEMATIC DIAGRAM . 27 - 43 IC BLOCK DIAGRAM . 44 - 51 EXPLODED VIEW. 52 - 53 EXPLODED VIEW PARTS LIST. 54 - 55 ELECTRICAL PARTS LIST . 56 - 68 PACKING DIAGRAM . 69 VERSION HISTORY . 70 Parts marked with the symbol are critical with regard to the risk of fire and electric shock
6、. Replace only with parts recommended by the manufacturer. RadioFans.CN 收音机爱 好者资料库 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,
7、1 kHz)127 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,
8、 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.2SL Track 46 200 - 20 kHz 0.8 dB SR Track 47 200 - 20 kHz 0.8 dB C Track 44 200
9、 - 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
10、, 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/R40 Hz0 2.0 dB 20 Hz0 2.0 dB I/P mode : L=R: 1 V in, 1 W, Ch /L/R40 Hz0 2.0 dB Ch C20 kHz0 2.0 dB I/P mode : L=-R: 1 V in, 1 W, Ch SL/SR40 Hz0 2.0 dB 20 kHz0 2.0 dB S/N Ratio (200 mV i
11、n, 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/SRTrack 61 kHz0.3 1.3 W Channel Difference (FL ref): FL/FR
12、/C/SL/SRTrack 61 kHz 1.0 dB Harmonic Distortion (Audio Filter) : FL/FR/C/SL/SRTrack 10-14 1 kHz 0.08 % Frequency Response (20 Hz to 20 kHz)Track 26-30+2/-1.5 Subwoofer Output Level1 kHz ref at pre-out (FL)Play Track 10, charge to 1512.5 1.5 dB AM TUNER SECTION Input level is expressed as the reading
13、 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 Output170 -20/+30 mV Loop sensitivity(20 dB S/N) 999/1000 kHz 66 dB 603/600 kHz
14、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 dBV 15 dBuv S/N Ratio(60 dB, IHF wtd)Mono 63 dB 63 dB Stereo 63 dB 63 dB Freq
15、uency Response(20 Hz - 15 kHz, 60 dB)0 1.5 dB0 1.5 dB Channel Separation(60 dB)100 Hz 30 dB 30 dB 1 k 38 dB 38 dB 10 kHz 30 dB 30 dB Alternate Channel Selectivity (40 dB, 400 kHz) 60 dB 45 dB Capture Ratio(40 dB) 3 dB 3 dB AM Suppression (60 dB, 100% Mod. FM, 30% Mod. AM) 48 dB 48 dB Image Rejection
16、(119.4 MHz) 65 dB I.F. Rejection(10.7 MHz) 78 dB Pilot Suppression(98 MHz) 60 dB 60 dB THD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C)Mono 0.25 % 0.25 % Stereo 0.35 % 0.35 % Auto-Search SensitivityOn 24 dB 24 dB Off 15 dB 15 dB RDS decode Sensitivity 26 dB PHYSICAL SPECIFICATIONS Dimensions (Width
17、x Height x Depth) 435 x 170 x 423 mm Net Weight 20.50 Kg (45.10 lbs) Shipping Weight 24.0 Kg (52.80 lbs) 6 FRONT PANEL REAR PANEL / FRONT PANEL VIEW REAR PANEL 1.FM & AM ANTENNA 2.SOFT CLIPPING ON/OFF 3.MONITOR OUT 4.CD INPUT 5.IR INPUT & OUTPUT 6.+12V TRIGGER INPUT & OUTPUT 7.COMPONENT VIDEO IN & C
18、OMPONENT VIDEO OUT 8.DIGITAL AUDIO INPUT & DIGITAL AUDIO OUTPUT 9.POWER SWITCH 10.SWITCHED AC OUTLETS 11.AC POWER INLET 12.SPEAKERS A & B 13.DVD, SAT, VCR, VIDEO 4 & VIDEO 5 14.MAIN IN / AUDIO PRE-OUTS / SUBWOOFER OUT 15.TAPE INPUT & OUTPUT 16.MS OUT (MULTISOURCE OUT) 17.7.1 CH. INPUTS 1.STANDBY SWI
19、TCH 2.STANDBY LED 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.SOURCE DOWN / UP 12.SURROUND MODE 13.LEVELS 14.TONE DEFEAT 15.TONE CONTROLS 16.SPEAKERS A & B 17.VIDEO 6 INPUT 18.PHONES 7 DISASSEMBLY INSTRUCTIONS 1.Remove machin
20、e screws M4.0 x 8.0 (1 to 6) from the side panels. Remove tapping screw 3.0 x 8.0 (7 to 10) from the back panel. Refer to Figure No. 1. 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. Fi
21、gure No. 1 Figure No. 2 8 ? ? ? ? ? ? UL1533 L=540mm 82-0426135-03-XX CABLE ASSY 4 WAYS 2.5P UL2468 L=540mm ? ? ? 36-2028201-71-XX FFC CABLE 20 PINS P1.25 L=200mm ? ? 36-3028061-71-XX FFC CABLE 30 PINS P1.25 L=60MM 82-1026135-01-XX CABLE ASSY 10 WAYS #26 2.5P UL2877 L=540mm ? 82-0826135-04-XX CABLE
22、ASSY 8 WAYS #26 2.5P ? ? 82-0426135-01-XX CABLE ASSY 4 WAYS #26 2.5P UL2877 L=430mm ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?
23、? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WIRING DIAGRAM 9 BLOCK DIAGRAM 10 SPECIAL FUNCTION FEATUREKEYS PRESS ON FRONT PANEL RESET FOR AH VERSIONVIDEO 6 +SOURCE UP RESET FOR C VERSIONVIDEO 6 + SOURCE DOW
24、N NTSC / PAL SELECTIONVIDEO + MEMORY VFD ALL DISPLAYAUDIO 6 + TONE DEFEAT AM FREQ. STEPAM/FM + FM MUTE DETAILS & WAVEFORMS ON SYSTEM TEST & DEBUGGING M6759(U202) main clock is at 40MHz(X202) M6759(U201) main clock is at 40MHz(X201) UPPER - +5V supply to KEYBOARD when power up LOWER - RESET line (TCM
25、810LENB713) when power up UPPER - OUTPUT ENABLE(pin 24) of EPROM (W27C02) when changing SURROUND MODES LOWER -CHIP ENABLE(pin 22) of EPROM (W27C02) when changing SURROUND MODES SCLK (pin 43 of CS49326) LRCLK (pin 42 of CS49326) MCLK (pin30 of CS49326) NOTE: The waveforms are based on software versio
26、n V1.27. 11 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.Rep
27、eat for other channels. CHANNELJUMPERVR FLP501R522 FRP502R545 CP503R571 SLP801R835 SRP802R836 BSP803R897 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 out
28、put. 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.
29、9.The clipping power(at THD 0.1%) should less than 85W. ADJUSTMENT POINT DIAGRAM R522R545R571 P501 P502P503 P803 P802P801 R835R836R897 R881 FRONT / CENTER AMPLIFIER BOARD SURROUND AMPLIFIER BOARD SECONDARY / ISC BOARD 12 PCB LAYOUT AUDIO BOARD POWER SUPPLY (STANDBY) BOARD 13 COMPONENT VIDEO BOARD -
30、COMPONENT SIDE COMPONENT VIDEO BOARD - COPPER SIDE DIGITAL BOARD - COMPONENT SIDE SIDE DIGITAL BOARD - COPPER SIDE 14 DSP BOARD - COPPER SIDE DSP BOARD - COMPONENT SIDE 15 FRONT / CENTER AMPLIFIER BOARD - COMPONENT SIDE 16 FRONT / CENTER AMPLIFIER BOARD - COPPER SIDE 17 SURROUND AMPLIFIER BOARD - CO
31、MPONENT SIDE 18 SURROUND AMPLIFIER BOARD - COPPER SIDE 19 KEY BOARD/POWER SWITCH - COMPONENT SIDE KEY BOARD/POWER SWITCH - COPPER SIDE 20 MAIN BOARD 21 MULTI-CHANNEL BOARD - COMPONENT SIDE 22 MULTI-CHANNEL BOARD - COPPER SIDE 23 PRE-OUT BOARD - COPPER SIDE PRE-OUT BOARD - COMPONENT SIDE 24 SPEAKER T
32、ERMINAL BOARD POWER SWITCH / TRIGGER BOARD VIDEO 6 BOARD 25 SECONDARY / ISC BOARD - COMPONENT SIDE SECONDARY / ISC BOARD - COPPER SIDE 26 S-VIDEO BOARD COMPOSITE VIDEO BOARD 27 SCHEMATIC DIAGRAM AUDIO SWITCH RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE
33、 SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 28 COMPONENT VIDEO RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%.
34、 29 E C B 2SA2878 E C B 2SA933 DTC123ESA E C B COMPOSITE VIDEO RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE: 1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V, 10%. 30 E C B 2SA1015 2SC1815 E C B 2SA1016 POWER SUPPL
35、Y (SECONDARY) NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS. 31 POWER SUPPLY (STAND BY) E C B 2SC1815 RESISTORS : F-FUSIBLE, UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. COMPONENTS MARKED “” ARE SAFETY CRITIAL PARTS. 32 TRIGGER RESISTORS : UNLESS OTHERWISE SPECIFIED ARE CARBON FILM. NOTE:1. RESISTORS, UNLESS OTHERWISE SPECIFIED, ARE 1/6W, 5%. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED, ARE 50V,
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