NAD-C425-tun-sm 维修电路原理图.pdf

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1、NADC 425STEREOAM/FM TUNERC 425STEREOAM/FM TUNERSERVICE MANUALRadioFans.CN 收音机爱 好者资料库- 2 - 3 -SERVICE SAFETY PRECAUTIONS1. 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 in

2、sulated 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.CONTENTSDESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . PAGESPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4DISASSEMBLY IN

4、STRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6WIRING DIAGRAM. . . . . . . . . . . . . . . . . . . . .

5、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、. . . . . . . . . . . . . . . . 9ALIGNMENT PROCEDURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-12SCHEMAT

7、IC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-14IC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15-18ELECTRICAL PARTS LIST. . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19-27EXPLODED VIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28EXPLODED VIEW PARTS LIST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9、 . . . . . . . . . . . . . 29-30PACKING DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31RadioFans.CN 收音机爱 好者资料库- 2 - 3 -SPECIFICATIONSAM TUNER SECTIONInput level is expressed as the reading in open-circuit of 75-ohm source

10、impedance signal generatorUsable Sensitivity (999/1000kHz) 30dBS/N Ratio (5mV in) 38dBTHD (5mV in) 3%IF Rejection (450kHz) 36dBImage Rejection (F+2xIF) 28dBSelectivity 17dBOutput 130 +/-20mVLoop Sensitivity (20dB S/N) 999/1000 kHz 66 dB 603/600 kHz 66 dB 1404/1400 kHz 66 dBFrequency response (100 -

11、2.3 kHz, 5mV) 6 dBFM TUNER SECTION *C *AHInput level is expressed as the reading in open-circuit of 75-ohm source impedance signal generatorUsable Sensitivity (98 MHz) 13 dB 13 dBSignal / Noise Ratio Mono 72 dB 72 dB (60 dB, IHF wtd) Stereo 66 dB 66 dBFrequency Response (20 Hz - 15 kHz, 60 dB) 01.0

12、dB 01.0 dBChannel Separation (60 dB) 30 Hz 33 dB 33 dB 1 kHz 42 dB 42 dB 10 kHz 32 dB 32 dBAlternate Channel Sensitivity (40 dB, 400 kHz) 60 dB 45 dBCapture Ratio (40 dB) 3 dB 3 dBAM Suppression (60 dB, 100% Mod.FM, 30% Mod AM) 65 dB 65 dBImage Rejection (119.4 MHz) 85 dB 85 dBI.F. Rejection (10.7 M

13、Hz) 78 dB 78 dBPilot Suppression (60 dB) 60 dB 60 dBTHD (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 sensitivity On 24 dB 24 dB Off 15 dB 15 dBRDS Decode Sensitivity 26 dB 26 dBPHYSICAL SPECIFICATIONSDimensions (Width x Height x Depth) 435 x 80 x 285 mm

14、Net weight 4 kg (8.8 lbs)Shipping weight 5.1 kg (11.22 lbs)- 4 - 5 -REAR PANEL / FRONT PANEL1. FM ANTENNA2. AM ANTENNA3. OUTPUT4. IR IN5. 12V TRIGGER IN6. AC LINE CORD7. RS-2321. POWER ON / OFF2. POWER STATUS INDICATOR3. BLEND4. MEMORY5. FM MUTE / MODE6. AM / FM7. DISPLAY8. PRESET / TUNE9. DISPLAY A

15、REA10. PRESET / TUNE CONTROLFRONT PANELREAR PANELIMPORTANT NOTES1. Show the software version Press “BLEND” and “AM/FM”.2. Light UP all the icon on the VFD Press “BLEND” & “DISPLAY”.3. Factory test resets When VFD all Light press any key.4. AM Step 10K/9K Change When AM band, press “AM/FM” & “PRESET/

16、TUNE”.5. Shipment resets When pressing “DISPLAY” & “PRESET/TUNE” to VFD all Light, press any key.- 4 - 5 -54312766DISASSEMBLY 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. Pu

17、ll both sides of the TOP COVER slightly outwards 6 and tilt approx. 35 and then remove in the direction as indicated by the arrow 7 . Refer to Figure No.2. Figure No.2.- 6 - 7 -AM LOOP ANTFM ANTOUTPUTFRONT ENDENV172D3G1VFDCPULC866448BU201U202VFD DRIVERPT6311KEY MATRIXTrigger INU203EEPROM24C08PLLLC72

18、723MRDS DECODERU901AM/FM IFLA1837MUTINGIR INU70174HC86M218REMOTESENSORPOWERSUPPLYVFD-VP+5V CPU+10VAC INPUTLRVTVTcedataclkRDS-CLKRDS-SIGRDS-DATAMPXINdataout(#1)=Power On(#1)+(#2)=StandbyLC7218U903ST/MO, MUTE, SMETERTUNEFMOSC/IFAMOSC/IF127171623230U902212345151115810 IN16142016142212/1351619241918BLOC

19、K DIAGRAM- 6 - 7 -WIRING DIAGRAMMAIN BOARDKEY BOARDDISPLAY BOARDLED BOARDTRANSFORMERPOWER SUPPLY BOARDYELLOWBLUEWHITE- 8 - 9 -ADJUSTMENT POINTS DIAGRAMOSCRFVT- 8 - 9 -FMSIGNALGENERATORANTENNATERMINALOUTPUTTERMINALDISTORTIONMETERDISTORTIONMETERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEACVOLTMET

20、EROROSCILLOSCOPEOUTPUTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM LOOPANTENNA60cmDIGITALMILLIVOLT-METERVT_J911FMSIGNALGENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATORFMSTEREOGENERATORP901OUTPUTTERMINALDCMILLIVOLT-METERUNITUNITUNITUNITINSTRU

21、MENT SETUP1. FM MEASUREMENTFig. 1Fig. 22. RDS MEASUREMENTFig. 33. AM MEASUREMENTFig. 4- 10 -ALIGNMENT PROCEDURESFM/RDS SECTION- FM mono: 1kHz, 75kHz devi., 60dB/V- FM stereo: 1kHz, 67.5kHz devi., 60dB/V Pilot signal 19kHz 7.5kHz devi.OUTPUTS- Connect the 47Kohm resistor unless otherwise noted.ItemSt

22、epConnectionof instrumentFM SGoutputStereo modulator outputTuningfrequencyOutputindicatorAdjustmentpointAdjustforRemarksFMIF/RF1Fig.199.0MHz1kHz 75kHz devi.65dBf (60dB)99.0MHzDC voltmeterL941070mVFM MUTE/MODE switch: ON/AUTORepeat the steps1 to 3 until no further adjustment is necessary.2AC voltmete

23、rIFT on the front endMaximum3DistortionanalyzerL942MinimumStereoDistortionFig.299.0MHz Ext.mod. 65dBf (60dB)Channel Lor R 1kHz99.0MHzDistortionanalyzerIFT on the front endMinimumFM MUTE/MODE switch: ON/AUTODont turn more than 180StereoSeparationFig.299.0MHz Ext.mod. 65dBf (60dB)Channel Lor R 1kHz99.

24、0MHzOscilloscopeR941MaximumseparationRepeat stereo distortion and stereo separation alignment until THD at minimum and separation at maximum.DistortionMeterMinimumMuteLevelFig.199.0MHz 18dB99.0MHzOscilloscopeR956SignaloutputRDSFig.399.0MHz Ext.mod. 65dBf (60dB)RDS 2% MOD99.0MHzDecodethe RDS-Program

25、stationAM SECTIONAF Modulation: 400Hz, 30%For AH VersionStepAM SGoutputTuningfrequencyOutputindicatorAdjustmentpointAdjustfor1530kHzDigitalDCvoltmeterOSC coilon RFblock M9711.350.2V2600kHz400Hz 30% mod.60dB/m600kHzACvoltmeterRF coilon RFblock M971Maximum3600kHz400Hz 30% mod.60dB/m990kHzACvoltmeterL9

26、72MaximumFor C VersionStepAM SGoutputTuningfrequencyOutputindicatorAdjustmentpointAdjustfor1522kHzor531kHzDigitalDCvoltmeterOSC coilon RFblock M9711.30.2V (522kHz)1.350.2V (531kHz)2600kHz400Hz 30% mod.60dB/m603kHzACvoltmeterRF coilon RFblock M971Maximum3600kHz400Hz 30% mod.60dB/m999kHzACvoltmeterL97

27、2Maximum- 11 -PCB LAYOUTPOWER SUPPLY BOARDDISPLAY BOARDLED BOARDKEY BOARD- 12 - 13 -MAIN BOARD- 12 - 13 -SCHEMATIC DIAGRAMKEY / MCU / DISPLAYNOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED.425KB-MP.sch-1 - Tue Jul 18

28、 09:17:14 20066.5V- 14 -TUNERNOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8W UNLESS OTHERWISE SPECIFIED. 2. CERAMIC CAPACITORS ARE 50V 10% UNLESS OTHERWISE SPECIFIED.- 15 -SerialDataInterfaceDINDOUTCLKSTBVDDROSCSW1SW2SW3SW4LED1LED2LED3LED4LED5K1 K2 K3 K4VDDGNDVEESG1/KS1OSCGeneralInputRegisterLEDDriverDim

29、ming CircuitGridDriverSegmentDriverGridDriverKey ScanOutputControlDispaly MemoryTiming GeneratorKey Matrix MemorySG2/KS2SG3/KS3SG4/KS4SG5/KS5SG6/KS6SG7/KS7SG8/KS8SG9/KS9SG10/KS10SG11/KS11SG12/KS12SG13/GR16SG14/GR15SG15/GR14SG16/GR13SG17/GR12SG18/GR11SG19/GR10SG20/GR9GR1GR2GR3GR4GR5GR6GR7GR8IC BLOCK

30、DIAGRAMDisplay BoardU202: PT6311- 16 - 17 -Main BoardU201: P89LCP936ACCELERATED 2-CLOCK 80C51 CPU4 kb/8 kB/16 kBCODE FLASH256-BYTEDATA RAMPORT 2CONFIGURABLE I/OsPORT 1CONFIGURABLE I/OsPORT 0CONFIGURABLE I/OsKEYPADINTERRUPTPROGRAMMABLEOSCILLATOR DIVIDERCPUclockCONFIGURABLEOSCILLATORON-CHIPRCOSCILLATO

31、Rinternal busCRYSTALORRESONATORPOWER MONITOR(POWER-ON RESET, BROWNOUT RESET)UARTANALOGCOMPARATORS512-BYTEAUXILIARY RAMI2C-BUS512-BYTEDATA EEPROM(P89LPC935/936)PORT 3CONFIGURABLE I/OsCCU (CAPTURE/COMPARE UNIT)(P89LPC935/936)P89LPC933/934/935/936WATCHDOG TIMERAND OSCILLATORTIMER 0TIMER 1REAL-TIME CLOC

32、K/SYSTEM TIMERSPIADC1/DAC1ADC0/DAC0(P89LPC935/936)P31:0P27:0P17:0P07:0X2X1TXDRXDSCLSDAT0T1CMP2CIN2BCIN2ACMP1CIN1ACIN1BOCAOCBOCCOCDICAAD10AD11AD12AD13DAC1AD00AD01AD02AD03DAC1ICBSPICLKMOSIMISOSSP89LPC935FDHP89LPC936FDH12345678910111213141615181720192221242326252827P2.0/ICB/DAC0/AD03P2.1/OCD/AD02P0.0/C

33、MP2/KBI0/AD01P1.7/OCC/AD00P1.6/OCBP1.5/RSTVSSP3.1/XTAL1P3.0/XTAL2/CLKOUTP1.4/INT1P1.3/INT0/SDAP1.2/T0/SCLP2.2/MOSIP2.3/MISOP2.7/ICAP2.6/OCAP0.1/CIN2B/KBI1/AD10P0.2/CIN2A/KBI2/AD11P0.3/CIN1B/KBI3/AD12P0.4/CIN1A/KBI4/DAC1/AD13P0.5/CMPREF/KBI5VDDP0.6/CMP1/KBI6P0.7/T1/KBI7P1.0/TXDP1.1/RXDP2.5/SPICLKP2.4

34、/SS- 16 - 17 -VCC87465321GNDWPSCLLOADLOADINCDATA WORDADDR/COUNTERY DECX DECR/WCOMPSERIALCONTROLLOGICENH.V. PUMP/TIMINGDATA RECOVERYEEPROMSERIAL MUXDOUT/ACKLOGICDEVICEADDRESSCOMPARATORSTARTSTOPLOGICSDAA2A1A0DINDOUTMain BoardU203: AT24C08A-10PUMain BoardU204: MAX232D16151413121110912345678VCCGNDT1OUTR

35、1INC2+C1-V+C1+R1OUTT1INT2INR2OUTR2INT2OUTV-C2-Main BoardU402: NJM78M56FA1?INPUT3?OUTPUT2?GNDMain BoardU701: 74HC8612345671413121110981A1B1Y2A2B2YGNDVCC4B4A4Y3B3A3Y123456789101112131415302928272625242322212019181716ALCAMOSCAMMIXAMRF.AMPREGAGCAM IFAMS-METERTUNINGDRIVESTEREODRIVEVCCVCCAM/FMIF-BUFFFMS-M

36、ETERS-CURVEAM IFFMDETGNDFM IF INPUTAM MIXEROUTPUTFM IF INPUTBYPASSAM IF INPUTGNDTU-LEDST LEDAM-IF OUTPUTFM DETECTORAM NARROW CFFM S-METEROUTPUTAM S-METEROUTPUTMUTEFM/AMSWITCHPILOT VCOSDCOMPDETBUFFDECODERANTI-BIRIDE3 rd 5 thSTEREOSWMUTEVCO304kHzFF38kP-DETFM SDADJOSCREGAM RFINPUTAFCAM AGCAM DETECTORIN

37、PUTFM DETECTOROUTPUTMPXIUTPUTMPXOUTPUTMPXOUTPUTAM STEREO LINPUTAM STEREO RINPUTL-OUTR-OUT FF19k FF19k PILOTDETMain BoardU901: LA1837L-E- 18 - 19 -Main BoardU902: LC72723MVdda3REFERENCEVOLTAGEANTIALIASINGFILTERDATADECODERVREF1VREFFLOUT5CIN6PLL(57kHz)CLOCKRECOVERY(1187.5Hz)+_Vddd11Vssd10RDDA14RDCL15MO

38、DE12RST13RDS-ID/READY16Vssa4MPXIN2TEST7TEST57kHzBPF(SCF)SMOOTHINGFILTEROSCCLK(4.332MHz)9XIN8XOUTRDS-IDDETECTRAM(128bits)212216152023871714131211109543218192416XINFMINAMINCEDICLD0OUT0OUT1XOUTPHASE DETECTORCHARGE PUMPREFERENCEDIVIDERSWALLOW COUNTER1/16, 1/17 4 BITSHIFT REGISTERLATCHUNIVERSALCOUNTER121

39、2-BIT PROGRAMMABLEDIVIDERSYCOUT2 OUT3OUT4 OUT5 OUT6IN0IN1VSSVDDLCTRHCTRPD2PD1Main BoardU903: LC7218-E- 18 - 19 -ELECTRICAL PARTS LISTDISPLAY ASSYPC BOARDPCB-C42526+DSPPCB ASSY DISPLAYPCB1725-859A+0000PCB MAIN/KEY/DIS/PSU/LEDCAPACITORC201157B-107M+K-LIICE 6.3V 100UF 20% RLTC202150F-103K+2-FCCC 50V 0.

40、01uF 10% AT 3.5C210150F-104K+2-FCCC 50V 0.1UF 10% ATC211157Q-107M+K-LUICE 35V 100UF 20% RLTC212157B-107M+K-LIICE 6.3V 100UF 20% RLTC213150F-104K+2-FCCC 50V 0.1UF 10% ATDIODED201, D2064804-1480+CDIODE 1N4148M-A(WA) ATSWAFER/CONNECTORJ202A2101-1441+0FLEXIBLE CONN 15P P1.0 RJ203A2102-031R+004WAFER 3P P

41、2.5 RIGHTTRANSISTORQ201, Q202485C-114E+KTR DTC114ES RLTRESISTORR210, R2114701-221J+2RCF 1/8W 220R 5% ATR215, R2164701-471J+2RCF 1/8W 470R 5% ATR2194701-681J+2RCF 1/8W 680R 5% ATR2204701-821J+2RCF 1/8W 820R 5% ATR2214701-182J+2RCF 1/8W 1.8K 5% ATR2224701-681J+2RCF 1/8W 680R 5% ATR2274701-563J+2RCF 1/

42、8W 56K 5% ATICU2023131-8700+0IC PT6311(L) VFD DRIVERSWITCHM201, M202, M203, M204, M205, M2065200-3538+0SWITCH, TACT SKHHBY 7MMLocationPart NumberDescription- 20 - 21 -LocationPart NumberDescriptionWIREJ201A7012-6688+0CONN WIRE 3P P=2.5 26AWGMISCELLANEOUSM2094154-2101+0VFD HOLDERM2104814-3TE2+3IR SEN

43、SOR PIC-26043TE2VFD2460-1961+0DISPLAY-VFD HNA-10SM55KEY ASSYPC BOARDPCB-C42526+KEYPCB ASSY KEY C425PCB1725-859A+0000PCB MAIN/KEY/DIS/PSU/LEDCAPACITORC230, C231150F-103K+2-FCCC 50V 0.01uF 10% AT 3.5WAFERJ201B2102-031R+004WAFER 3P P2.5 RIGHTMISCELLANEOUSVR2015200-4951+0ENCODER ROTARY DPDTLED ASSYPC BO

44、ARDPCB-C42526+LEDPCB ASSY LEDPCB1725-859A+0000PCB MAIN/KEY/DIS/PSU/LEDLEDD2093700-3517+RGLED RED/GREEN (L-469HGW)WIREJ203B7012-6688+0CONN WIRE 3P P=2.5 26AWGMAIN ASSYPC BOARD*EUPCB-C42526+MAINPCB ASSY MAIN- 20 - 21 -LocationPart NumberDescription*CAPCB-C425D6+MAINPCB ASSY MAINPCB1725-859A+0000PCB MA

45、IN/KEY/DIS/PSU/LEDCAPACITORC203150F-223K+2-FDCC 50V 0.022uF 10% ATC204157D-107M+K-IUICE 16V 100UF 20% RLTC205150F-104K+K-IICC 50V 0.1U 10% RLT 5x5C206, C207, C208, C209157F-105M+K-IUICE 50V 1UF 20% RLT 5X11C213 *CA150F-223K+2-FDCC 50V 0.022uF 10% ATC217150F-223K+2-FDCC 50V 0.022uF 10% ATC219, C22215

46、0F-104K+K-IICC 50V 0.1U 10% RLT 5x5C223157F-475M+K-IUICE 50V 4.7UF 20% RLTC401, C402, C403, C404153F-224J+K-MIBCM 50V 0.22U 5% RLT 7X5C405, C406157D-228M+5-X=ICE 16V 2200UF 20% RLC407157D-226M+K-IUICE 16V 22UF 20% RLT 5X11C408157D-228M+5-X=ICE 16V 2200UF 20% RLC409157D-227M+K-LUICE 16V 220UF 20% RLT

47、C410, C411150F-104K+K-IICC 50V 0.1U 10% RLT 5x5C412157D-107M+K-IUICE 16V 100UF 20% RLTC413157E-227M+K-OVICE 25V 220UF 20% RLTC414157D-107M+K-IUICE 16V 100UF 20% RLTC415, C416, C417, C418157F-107M+K-OVICE 50V 100U 20% RLTC419157B-107M+K-LIICE 6.3V 100UF 20% RLTC420157D-228M+5-X=ICE 16V 2200UF 20% RLC

48、421157E-108M+K-S9ICE 25V 1000UF 20% RLTC701150F-473K+2-GDCC 50V 0.047UF 10% ATC702157D-106M+K-IUICE 16V 10UF 20% RLT 5X11C706150F-104K+K-IICC 50V 0.1U 10% RLT 5x5C707153F-102J+K-IMCM 50V 1000P 5% RLT 5x7C709157B-107M+K-IUICE 6.3V 100UF 20% RLTC901 *EU150F-223K+2-FDCC 50V 0.022uF 10% ATC902, C903150F

49、-223K+2-FDCC 50V 0.022uF 10% ATC904157D-106M+K-IUICE 16V 10UF 20% RLT 5X11C906157D-107M+K-IUICE 16V 100UF 20% RLTC907157D-477M+K-OVICE 16V 470UF 20% RLTC911150F-200J+2-FCCC 50V 20pF 5% AT 3.5x2C912, C913150F-102K+2-FCCC 50V 1000pF 10% AT 3.5C914, C915150F-101K+2-FCCC 50V 100pF 10% AT 3.5xC916150F-33

50、1K+2-FCCC 50V 330pF 10% AT 3.5xC92415CH-270J+5-GGCTC 0/60 27pF 5% RL 4x4C92515CH-200J+5-GGCTC 0/60 20pF 5% RL 4x4- 22 - 23 -LocationPart NumberDescriptionC926153F-333J+K-NLMCM 50V 0.033U 5% RLT 7.5C927157F-225M+K-IUICE 50V 2.2U 20% RLTC928157D-106M+K-IUICE 16V 10UF 20% RLT 5X11C929157F-224M+K-IUICE