NAD-C730-rec-sm 维修电路原理图.pdf
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1、NADSERVICE MANUALC 730STEREORECEIVERC 730STEREORECEIVERRadioFans.CN 收音机爱 好者资料库2SERVICE SAFETY PRECAUTIONS1.Replacing the fusesCAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE REPLACE ONLYWITH SAME TYPE OF FUSE.Reference NoPart NumberDescriptionM151 *AH 5120-0037-0FU T3.15A 250V UL/CSA 5X20
2、MMM152 *C 5100-2530-1BT2.5A/250V IECM154 *AH 5120-0052-0FUSE T1.6A 250V 5X20MM UL/CSANOTE: : 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 measurementsto determine that exposed par
3、ts 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.CONTENTSDESCRIPTIONPAGESPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、 . . . . . . . . . . . . . . . . . . . . . . . . . .3-4REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6B
5、LOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8ADJUSTMENT POINTS DIAGRAM . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7、 . . . . . . . . . . .10-11IMPORTANT NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-14SCHEMATIC D
8、IAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15-19IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-23ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . .
9、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-33EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
10、. . . . .35-36PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37RadioFans.CN 收音机爱 好者资料库3SPECIFICATIONSPOWER AMPLIFIER SECTION1.Rated Distortion(THD 20Hz-20KHz, 30W, 8 ohm)0.08%(THD 1KHz, 30W, 4 ohm)0.1%2.Input Sensitivity
11、 (ref. 30W 8 ohm, 1KHz)350+/-30mV3.S/N Ratio (A-wtd, 1K ohm, 500mV CD in, 1KHz)-85dB4.Frequency Response (500mV CD in, 1W, 20Hz-20KHz)00.8dB5.Channel BalanceVolume maximal output 30W (ref), 1KHz1dB1dB to -40dB, 1KHz2dB-41dB to -50dB, 1KHz3dB6.Audio Muting at 1KHz-52dB7.Headphone Output in 0.1% (600
12、ohm load, 500mV CD in, 1KHz)10V8.Crosstalk (2V input, 10W, 1KHz)-63dBPRE - AMPLIFIER SECTION1.Rated Distortion (THD, 2V CD input, 4V output, 1KHz)0.08%2.Frequency Response (500mV CD in, 20Hz-20KHz)00.08dB3.S/N Ratio (A-wtd, 500mV CD in, 1KHz)-85dB4.Tone Control ResponseBass (500mV in,1W out ,100Hz)
13、boost / cut92dBTreble (500mV in,1W out ,10KHz) boost / cut92dBAM TUNER SECTIONFrequency Range:AH530 - 1710 KHzStep10 KHzC531 - 1602 KHzStep9 KHzInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generator.1.Usable Sensitivity (999/1000KHz)30dBV2.S/N Ratio (5mV i
14、nput)38dB3.THD (5mV input)3%4.IF Rejection (450KHz)36dB5.Image Rejection (F+2xIF)28dB6.Selectivity17dB7.Output130mV26mV8.Loop Sensitivity (20dB S/N)999/1000KHz66dB603/600KHz66dB1404/1400KHz66dB9.Frequency Response (100-2.3KHz, 5mV)06dB4FM TUNER SECTIONFrequency Range:AH87.5 - 108 MHzStep50 KHzC87.5
15、- 108 MHzStep50 KHzInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generator.*C*AH1.Usable Sensitivity (Mono, 98MHz)15dB15dB2.S/N Ratio (60dB, IHF wtd)Mono72dB72dBStereo66dB66dB3.THD (60dB, L=R, 75KHz Dev. for AH, 40KHz Dev. for C)Mono0.3%0.3%Stereo0.35%0.35%
16、4.IF Rejection (10.7MHz)78dB65dB5.Image Rejection (119.4MHz)85dB85dB6.Capture Ratio (40dB)3dB3dB7.AM Suppression (60dB, 100%mod FM, 30%mod AM)48dB48dB8.Pilot Suppression (60dB)60dB60dB9.Frequency Response(60dB, 20Hz - 15KHz in, 75S for AH, 50S for C and01.5dB01.5dBJapan)10. Channel Separation (60dB,
17、 IHF wtd)100Hz30dB30dB1KHz38dB38dB10KHz30dB30dB11. Alternate Channel Selectivity (400KHz, IHF)60dB45dB12. Muting Level183dB183dB13. Output750mV150mV500mV100mV14. Blend on Separation (60dB IHF wtd)62dB62dB15. RDS Decode Sensitivity26dB26dB16. Auto-search SensitivityOFF15dB15dBON24dB24dBPHYSICAL SPECI
18、FICATIONSDimensions (Width x Height x Depth)435 x 109 x 305 mmNet weight7.2 kg (15.87 lbs)Shipping weight9.2 kg (20.5 lbs)5REAR PANEL / FRONT PANELREAR PANELFRONT PANEL1. POWER ON / OFF2. STAND-BY INDICATOR3. BLEND4. MEMORY5. FM MUTE / MODE6. AM / FM7. DISPLAY8. PRESET / TUNE9. PRESET / TUNE AND 10.
19、 DISPLAY AREA11. VOLUME12. HEADPHONE SOCKET13. INPUT SELECTORS14. BASS & TREBLE15. TONE DEFEAT16. BALANCE1. FM ANTENNA2. AM ANTENNA3. DISC INPUT4. CD INPUT5. VIDEO INPUT6. AUX INPUT7. TAPE 2 IN, OUT8. TAPE 1 IN, OUT9. PRE OUT10. NAD-LINK IN, OUT11. SOFT CLIPPING12. 12V TRIGGER OUT13. SPEAKERS14. AC
20、LINE CORD15. SWITCHED AC OUTLET (AH version only)6DISASSEMBLY INSTRUCTIONS1. Remove machine screws M 4.0 x 6.0 ( 1 to 4 ) from the side panels.Remove tapping screw 3.0 x 8.5 ( 5 ) from the back panel.Refer to Figure No.1.Figure No.12. Pull both sides of the TOP COVER slightly outwards 6 and tilt app
21、rox. 35 and then removein the direction as indicated by the arrow 7 . Refer to Figure No.2.Figure No.2.543127667BLOCK DIAGRAMAM LOOP ANTFM ANTFRONT ENDENV172D3G1VFDProtectLRCPUKEY MATRIXTrigger OutREMOTESENSORCDDISCVIDEOAUXTAPE-1OUTTAPE-2OUTTC9273TAPE-2INPRE OUTTAPE-1IN (Mon)S111217PLLLC72723MAM/FM
22、IFLA1837TUNERDIODEMATRIXNAD LINKIN-OUTMAINPOWERSUPPLYSPEAKEROUTSTAND BYPOWERSUPPLYRELAYRELAYPOWERAMP.+5V CPUAC INPUTAC INPUTVTVTcedataclkRDS-CLKRDS-SIGRDS-DATAdataout(#1)=Power On(#2)=Protect (Flash 2Hz)(#1)+(#2)=Standby(#1)(#2)LC7218Locking SW,Tone defeatST/MO, MUTE, SMETERTUNEFMOSC/IFAMOSC/IFOUTAU
23、DIOAUDIO ININ S2S3S4S5S6S7S8S9S10VOLUMEMOTORIZEMUTE8WIRING DIAGRAMMAIN BOARDTRANSFORMERSECONDARY BOARDKEY BOARDPSU BOARDSPEAKER BOARDBLACK6PIN BLACK6PIN BLACK35PIN BLACKBROWNBLUE3PIN BLACK3PIN BLACKREDAC INPUTBLUE3PIN BLACK4PIN BLACKBLACKBLACKBLUEGREENTUNER BOARDPOWER SWITCH BOARDPHONE BOARDLED BOAR
24、DPRIMARY BOARDP32P39 P40 P41 P42 P43 P44 P45 P46 P47 P48P33P34P35P36OSCRFTestingPointTP2TestingPointTP1TestingPointTP3TestingPointTP49ADJUSTMENT POINTS DIAGRAM1. TUNER2. MAIN BOARDFMSIGNALGENERATOROUTPUTTERMINALOUTPUTTERMINALDISTORTIONANALYZERDISTORTIONANALYZERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSC
25、ILLOSCOPEACVOLTMETEROROSCILLOSCOPEOUTPUTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM LOOPANTENNA60cmDIGITALMILLIVOLTMETERVTJ911,GNDFMSIGNALGENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATORFMSTEREOGENERATORP901DCMILLIVOLTMETERUNITUNITUNITUNITI
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