NAD-C420-tun-sm 维修电路原理图.pdf

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1、NADSERVICE MANUALC 420STEREOAM/FM TUNERC 420STEREOAM/FM TUNERRadioFans.CN 收音机爱 好者资料库2SERVICE SAFETY PRECAUTIONS1.Safety check out(Only U.S.A. model)Before returning the product to the customer, make leakage current or resistance measurementsto determine that exposed parts are acceptably insulated fr

2、om 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、 . . . . . . . . . . . . .3REAR PANEL / FRONT PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4DISASSEMBLY INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5BLOCK DIAGRAM . . . . . . . .

4、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7ADJUSTMENT POINTS DIAGRAM . . . . . . . . . . . . . . . . . . . .

5、. . . . . . . . . . . . . . . . . . . . . . . . . .8INSTRUMENT SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9ALIGNMENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6、.10PCB LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11-12SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13-16IC BLOCK DIAGRAM . . . . . . . . . . . .

7、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-19ELECTRICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-25EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8、 . . . . . . . . . . . . . . . . . . . .26EXPLODED VIEW PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27PACKING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28RadioFa

9、ns.CN 收音机爱 好者资料库3SPECIFICATIONSAM TUNER SECTIONInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generatorUsable Sensitivity (999/1000kHz)30dBS/N Ratio (5mV in)38dBTHD (5mV in)3%IF Rejection (450kHz)36dBImage Rejection (F+2xIF)28dBSelectivity17dBOutput130 +/-20

10、mVLoop Sensitivity (20dB S/N)999/1000 kHz66 dB603/600 kHz66 dB1404/1400 kHz66 dBFrequency response (100 - 2.3 kHz, 5mV)6 dBFM TUNER SECTION*C*AHInput level is expressed as the reading in open-circuitof 75-ohm source impedance signal generatorUsable Sensitivity (98 MHz)13 dB13 dBSignal / Noise RatioM

11、ono72 dB72 dB(60 dB, IHF wtd)Stereo66 dB66 dBFrequency Response (20 Hz - 15 kHz, 60 dB)01.0 dB01.0 dBChannel Separation (60 dB)30 Hz33 dB33 dB1 kHz42 dB42 dB10 kHz32 dB32 dBAlternate Channel Sensitivity(40 dB, 400 kHz)60 dB45 dBCapture Ratio (40 dB)3 dB3 dBAM Suppression(60 dB, 100% Mod.FM, 30% Mod

12、AM)65 dB65 dBImage Rejection (119.4 MHz)85 dB85 dBI.F. Rejection (10.7 MHz)78 dB78 dBPilot Suppression (60 dB)60 dB60 dBTHD (60 dB, L=R 75 kHz for AH, 40 kHz Dev for C)Mono0.25%0.25%Stereo0.35%0.35%Auto-Search sensitivityOn24 dB24 dBOff15 dB15 dBRDS Decode Sensitivity26 dB26 dBPHYSICAL SPECIFICATION

13、SDimensions (Width x Height x Depth)435 x 80 x 285 mmNet weight4 kg (8.8 lbs)Shipping weight5.1 kg (11.22 lbs)4REAR PANEL / FRONT PANELREAR PANELFRONT PANEL1. FM ANTENNA2. AM ANTENNA3. OUTPUT4. NAD-LINK IN/OUT5. 12V TRIGGER IN6. AC LINE CORD1. POWER ON / OFF2. STAND-BY LED3. BLEND4. MEMORY5. FM MUTE

14、 / MODE6. AM / FM7. DISPLAY8. PRESET / TUNE9. DISPLAY AREA10. PRESET / TUNE AND IMPORTANT NOTES1. Show the software versionPress “PRESET/TUNE” and “TUNE UP” ().2. Light UP all the icon on the VFLPress “PRESET/TUNE” and “TUNE DOWN” ().3. CPU ResetsPress “PRESET/TUNE” and “TUNE DOWN” () and any one ke

15、y.4. AM Step 10K/9K ChangeAdd D206: 10KHz / Delete D206: 9KHz.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. Pull both sides of the TOP COVER slightly outward

16、s 6 and tilt approx. 35 and then removein the direction as indicated by the arrow 7 . Refer to Figure No.2.Figure No.2.56BLOCK DIAGRAMAM LOOP ANTFM ANTOUTPUTFRONT ENDENV172D3G1VFDCPULC866448BU201KEY MATRIXTrigger INU202EEPROM24C08PLLLC72723MRDS DECODERU901AM/FM IFLA1837MUTINGDIODEMATRIXNAD LINKIN-OU

17、TM218REMOTESENSORPOWERSUPPLYVFD-VP+5V CPU+10VAC INPUTLRVTVTcedataclkRDS-CLKRDS-SIGRDS-DATAMPXINdataout(#1)=Power On(#2)=Protect (Flash 2Hz)(#1)+(#2)=Standby(#1)(#2)LC7218U903ST/MO, MUTE, SMETERTUNEFMOSC/IFAMOSC/IF127171623230U902212345152319586 IN2 OUT24161479161422787172575767419187WIRING DIAGRAMMA

18、IN BOARDKEY BOARDLED BOARDTRANSFORMERYELLOWBLUEWHITEPOWER SUPPLY BOARDTrigger InAudioL,R Out8ADJUSTMENT POINTS DIAGRAMOSCRFVTTrigger InAudioL,R OutFMSIGNALGENERATORANTENNATERMINALOUTPUTTERMINALDISTORTIONMETERDISTORTIONMETERACVOLTMETEROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEACVOLTMETEROROSCILLOSCOPEOUTP

19、UTTERMINALOUTPUTTERMINALLRANTENNATERMINALANTENNATERMINALANTENNATERMINALAM LOOPANTENNA(Accessory)AM LOOPANTENNA60cmDIGITALMILLIVOLT-METERVT_J911FMSIGNALGENERATORAMSIGNALGENERATORFMSIGNALGENERATORRDSGENERATORFMSTEREOGENERATORP901OUTPUTTERMINALDCMILLIVOLT-METERUNITUNITUNITUNIT9INSTRUMENT SETUP1. FM MEA

20、SUREMENTFig. 1Fig. 22. RDS MEASUREMENTFig. 33. AM MEASUREMENTFig. 410ALIGNMENT PROCEDURESFM/RDS SECTION- FM mono:1kHz, 75kHz devi., 60dB/V- FM stereo:1kHz, 67.5kHz devi., 60dB/VPilot signal 19kHz 7.5kHz devi.OUTPUTS- Connect the 47Kohm resistor unless otherwise noted.ItemFMIF/RFStereoDistortionStere

21、oSeparationMuteLevelSignaloutputStep1DC voltmeterL941070mV3DistortionanalyzerDistortionanalyzerOscilloscopeOscilloscopeL942R941R956MinimumMinimum2AC voltmeterIFT on thefront endIFT on thefront endMaximumMaximumseparationDistortionMeterMinimumConnectionof instrumentFig.1Fig.2Fig.2Fig.1Channel Lor R 1

22、kHz99.0MHz1kHz 75kHz devi.65dBf (60dB)99.0MHz Ext.mod. 65dBf(60dB)FM SGoutputStereo mod-ulator outputTuningfrequency99.0MHz99.0MHzChannel Lor R 1kHz99.0MHz Ext.mod. 65dBf(60dB)99.0MHz Ext.mod. 65dBf(60dB)RDS 2% MOD99.0MHz 18dB99.0MHz99.0MHzRDSFig.399.0MHzOutputindicatorAdjustmentpointAdjustforRemark

23、sFM MUTE/MODEswitch: ON/AUTORepeat the steps1 to 3 until no fur-ther adjustment isnecessary.FM MUTE/MODEswitch: ON/AUTODont turn morethan 180Repeat stereodistortion andstereo separationalignment untilTHD at minimumand separation atmaximum.Decodethe RDS-Program stationAM SECTIONAF Modulation: 400Hz,

24、30%For AH VersionStep123530kHz600kHz990kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock M971RF coilon RFblock M971Adjustfor1.350.2VMaximumMaximumStep123522kHzor531kHz603kHz999

25、kHz600kHz400Hz 30% mod.60dB/mAM SGoutputTuningfrequencyOutputindicatorAdjustmentpoint600kHz400Hz 30% mod.60dB/mACvoltmeterACvoltmeterDigitalDCvoltmeterL972OSC coilon RFblock M971RF coilon RFblock M971Adjustfor1.30.2V (522kHz)1.350.2V (531kHz)MaximumMaximumFor C Version11PCB LAYOUTPOWER SUPPLY BOARDK

26、EY BOARDLED BOARD12MAIN BOARDTrigger InAudioL,R Out1413GREENREDM302HNA - 10SM12M988SCHEMATIC DIAGRAMKEYBOARD / CPUNOTE: 1. RESISTORS ARE CARBON FILM 5% 1/8WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS ARE 50V 10%UNLESS OTHERWISE SPECIFIED.1516TUNERLEFT OUTRIGHT OUTM987NOTE: 1. RESISTORS ARE CARB

27、ON FILM 5% 1/8WUNLESS OTHERWISE SPECIFIED.2. CERAMIC CAPACITORS ARE 50V 10%UNLESS OTHERWISE SPECIFIED.17IC BLOCK DIAGRAMU201: LC866448BU202: 24C08S37/PE5P00P01P02P03P04P05P06P07VSS2P10/SO0P11/SI0/SB0P12/SCK0P13/SO1P14/SI1/SB1P15/SCK1P16/BUZ40393837363534333231302928272625S15/T15S14/T14S13/T13S12/T12

28、S11/T11S10/T10S9/T9S8/T8S7/T7S6/T6S5/T5S4/T4S3/T4S2/T2S1/T1S0/T165666768697071727374757677787980S36/PE4S35/PE3S34/PE2S33/PE1S32/PE0S31/PD7S30/PD6S29/PD5S28/PD4S27/PD3S26/PD2S25/PD1S24/PD0S23/PC7S22/PC6S21/PC5S20/PC4S19/PC3S18/PC2S17/PC1S16/PC0VPVDD21234 56789101112131415161718192021222324P17/PWM0P30

29、P31P32P33P70/INT0RESXT1/P74XT2/P75VSS1CF1CF2VDD1P80/AN0P81/AN1P82/AN2P83/AN3P84/AN4P85/AN5P86/AN6P87/AN7P71/INT1P72/INT2/T0INP73/INT3/T0IN646362616059585756555453525150494847464544434241VCC87465321GNDWPSCLLOADLOADINCDATA WORDADDR/COUNTERY DECX DECR/WCOMPSERIALCONTROLLOGICENH.V. PUMP/TIMINGDATA RECOV

30、ERYEEPROMSERIAL MUXDOUT/ACKLOGICDEVICEADDRESSCOMPARATORSTARTSTOPLOGICSDAA2A1A0DINDOUT18U901: LA1837U303: 74HCT00U402: NJM78M56FA11A21B31Y42A52B62Y7GND14VCC134B124A114Y103B93A3Y81INPUT3OUTPUT2GND123456789101112131415302928272625242322212019181716ALCAMOSCAMMIXAMRF.AMPREGAGCAM IFAMS-METERTUNINGDRIVESTE

31、REODRIVEVCCVCCAM/FMIF-BUFFFMS-METERS-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 SDADJOSCREGA

32、M RFINPUTAFCAM AGCAM DETECTORINPUTFM DETECTOROUTPUTMPXIUTPUTMPXOUTPUTMPXOUTPUTAM STEREO LINPUTAM STEREO RINPUTL-OUTR-OUT FF19k FF19k PILOTDET212216152023871714131211109543218192416XINFMINAMINCEDICLD0OUT0OUT1XOUTPHASE DETECTORCHARGE PUMPREFERENCEDIVIDERSWALLOW COUNTER1/16, 1/17 4 BITSHIFT REGISTERLAT

33、CHUNIVERSALCOUNTER1212-BIT PROGRAMMABLEDIVIDERSYCOUT2 OUT3OUT4 OUT5 OUT6IN0IN1VSSVDDLCTRHCTRPD2PD119U902: LC72723MVdda3REFERENCEVOLTAGEANTIALIASINGFILTERDATADECODERVREF1VREFFLOUT5CIN6PLL(57kHz)CLOCKRECOVERY(1187.5Hz)+_Vddd11Vssd10RDDA14RDCL15MODE12RST13RDS-ID/READY16Vssa4MPXIN2TEST7TEST57kHzBPF(SCF)

34、SMOOTHINGFILTEROSCCLK(4.332MHz)9XIN8XOUTRDS-IDDETECTRAM(128bits)U903: LC721820ELECTRICAL PARTS LISTReference No.Part No.DescriptionKEYBOARD ASSEMBLYPC BOARD3000PCB-N0930C-KEYKEY PCB ASSY C420VFD03032460-1960-0VFD SAMSUNG HNA-105M12CAPACITORSC201157B-107M-5-KMKCE 6.3V 100F 20% RL 6x7 ELNAC202153F-103

35、J-5-KMCM 50V 0.01F 5% RL 6.0 x7.0DIODESD2014804-1480-CDIODE 1N4148 ATSD206 *C4804-1480-CDIODE 1N4148 ATSCONNECTORSJ202A2101-1581-0FLEXIBLE CONN. 35P P1.25 SIDE ENTRYJ203A7705-1150-20045P CONN WIRE ASSY L=150 26AWGJ204A7702-1075-2004CONN.ASSY 2P P2.5 L=75 AWG26J204B2102-021R-004WAFER 2P P2.5 RIGHTSWI

36、TCHESM201, M203, M204, M206,5200-3538-0SWITCH, TACT SKHHBY 7mm HIGHM207, M210, M213, M216INFRA-RED SENSORM2184814-3TE2-3IR SENSOR PIC-12043TE2RESISTORSR2014701-681J-CRCF 1/8W 680R 5% ATSR203, R2044701-122J-CRCF 1/8W 1.2K 5% ATSR2074701-182J-CRCF 1/8W 1.8K 5% ATSR2104701-222J-CRCF 1/8W 2.2K 5% ATSR21

37、34701-472J-CRCF 1/8W 4.7K 5% ATSR220, R2214701-471J-CRCF 1/8W 470R 5% ATSR2224701-473J-CRCF 1/8W 47K 5% ATSR233-R2404701-103J-CRCF 1/8W 10K 5% ATSR241-R2464701-104J-CRCF 1/8W 100K 5% ATSR247, R2484701-103J-CRCF 1/8W 10K 5% ATSR263-R2744701-104J-CRCF 1/8W 100K 5% ATSR291-R2934701-103J-CRCF 1/8W 10K 5

38、% ATSR2944701-122J-CRCF 1/8W 1.2K 5% ATSLED ASSEMBLYPC BOARD5000PCB-N0930C-LEDPCB ASSY LED N093xCLEDD2113700-3517-RGLED RED/GREEN (L-469HGW)CONNECTOR WIREJ201B7703-1320-20043P CONN WIRE ASSY L=320 26AWGPOWER SUPPLY ASSEMBLYPC BOARD4000 *AHPCB-N0930C-PSUPOWER SUPPLY PCB ASSY C420AH4000 *CPCB-N0931C-P

39、SUPOWER SUPPLY PCB ASSY C420CSWITCH0401 5200-3151-0-01POWER SWITCHCAPACITORC801 8910-0049-0CAP400V 4700P DE7150F472MVA1KCRESISTORR801 *AH 4717-335J-2-SRMF 1/2W 3.3M 5% AT UL APPROVEDMAIN BOARD ASSEMBLYPC BOARD2000 *AHPCB-N0930C-TUNPCB ASSY TUNER (AH) N0930C2000 *CPCB-N0931C-TUNPCB ASSY TUNER (C) N09

40、31CJACKSM9872113-1300-02P RCA JACK W/R AU W/SHIELDM9882113-1121-02P RCA JACK Y/Y AU HSP-242V-22M3022113-1179-0PHONE JACK D3.5 BK JY-3537-01-140CAPACITORSC203157B-107M-5-KMKCE 6.3V 100F 20% RL 6x7 ELNAC204153F-103J-5-IMCM 50V 0.01F 5% RL 5x7C205150F-104Z-5-IUCC 50V 0.1F +80/-20% RL 5x11C208157D-476M-

41、5-IUKCE 16V 47F 20% RL 5x11 ELNAC210153F-103J-5-IMCM 50V 0.01F 5% RL 5x7C330150F-104K-2-FCCC 50V 0.1F 10% AT 3.5x2C331150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C332150F-104K-5-IICC 50V 0.1F 10% RL 5x5C333150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C401-C404153F-224J-5-MIBCM 50V 0.22F 5% RL 7x5C405157D

42、-228M-5-x9ECE 16V 2200F 20% RL 12.5x20 ELNAC406, C407157D-108M-5-S9KCE 16V 1000F 20% RL 10 x20 ELNAC408, C409157D-227M-5-OMKCE 16V 220F 20% RL 8x7 ELNAC410, C411150F-104K-5-IICC 50V 0.1F 10% RL 5x5C412157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNAC413157E-108M-5-S9ECE 25V 1000F 20% RL 10 x20 ELNAC414

43、-C418157F-107M-5-KUKCE 50V 100F 20% RL 6.3x11 ELNAC419157C-476M-5-IMKCE 10V 47F 20% RL 5x7 ELNAC420150F-104K-5-IICC 50V 0.1F 10% RL 5x5C421157E-107M-5-KUKCE 25V 100F 20% RL 6.3x11 ELNAC901 *C150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C902, C903150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C904157D-106M-5

44、-GMCE 16V 10F 20% RL 4x7C906157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNAC911150F-200J-2-FCCC 50V 20pF 5% AT 3.5x2C912, C913150F-102K-2-FCCC 50V 1000pF 10% AT 3.5x2C914, C915150F-101K-2-FCCC 50V 100pF 10% AT 3.5x2C916150F-331K-2-FCCC 50V 330pF 10% AT 3.5x2C92415CH-270J-5-GGCTC 0/60 27pF 5% RL 4x4C92

45、515CH-200J-5-GGCTC 0/60 20pF 5% RL 4x4C926153F-333J-5-NLMCM 50V 0.033F 5% RL 7.5 x6.5 MetalzdC927157F-225M-5-GMCE 50V 2.2F 20% RL 4x7C928157D-106M-5-GMCE 16V 10F 20% RL 4x7C929157F-224M-5-GMCE 50V 0.22F 20% RL 4x7C930150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.221Reference No.Part No.DescriptionC931157

46、B-107M-5-KMCE 6.3V 100F 20% RL 6x7C932, C941150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C942157D-107M-5-KUKCE 16V 100F 20% RL 6.3x11 ELNAC943157F-225M-5-GMCE 50V 2.2F 20% RL 4x7C944157F-475M-5-GMCE 50V 4.7F 20% RL 4x7C945150F-101K-2-FCCC 50V 100pF 10% AT 3.5x2C946157F-105M-5-GMCE 50V 1F 20% RL 4x7C947

47、157F-474M-5-GMCE 50V 0.47F 20% RL 4x7C948157F-105M-5-GMCE 50V 1F 20% RL 4x7C949, C950150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C951157F-225M-5-GMCE 50V 2.2F 20% RL 4x7C953, C954150D-272K-2-FCCC 16V 2700pF 10% AT 3.5x2C959, C960157D-226M-5-GMCE 16V 22F 20% RL 4x7C961, C962 *AH153F-272J-5-JMCM 50V 270

48、0PF 5% RL 5.5x7C961, C962 *C 153F-152J-5-KWCM 50V 1500pF 5% RL 6x12C963, C964157D-226M-5-GMCE 16V 22F 20% RL 4x7C965150D-272K-2-FCCC 16V 2700pF 10% AT 3.5x2C967157D-474M-5-IICE 16V 0.47F 20% RL 5x5C968150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C969157D-476M-5-IMCE 16V 47F 20% RL 5x7C970150F-223K-2-FD

49、CC 50V 0.022F 10% AT 3.2x2.2C97115CH-080D-5-GGCTC 0/60 8pF 0.5pF RL 4x4C973153F-473J-5-NLMCM 50V 0.047F 5% RL 7.5 x6.5 MetalzdC974150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C975157D-106M-5-GMCE 16V 10F 20% RL 4x7C976150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C977157F-225M-5-GMCE 50V 2.2F 20% RL 4x7C97

50、8150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C979157D-226M-5-GMCE 16V 22F 20% RL 4x7C980153F-224J-5-MIBCM 50V 0.22F 5% RL 7x5C981150F-223K-2-FDCC 50V 0.022F 10% AT 3.2x2.2C982150F-101K-2-FCCC 50V 100pF 10% AT 3.5x2C985150F-561K-2-FCCC 50V 560pF 10% AT 3.5x2C986157B-107M-5-KMCE 6.3V 100F 20% RL 6x7C987