JVC-PCX270-cs-sm 维修电路原理图.pdf

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1、 S E R V I C E M A N U A L MODEL : PC-X270 ( C ) AM/FM RADIO CASS CD PORTABLE SYSTEM RadioFans.CN 收音机爱 好者资料库 MATESTAR ELECTRONICS LTD. PERFORMANCE SPECIFICATIONSDate: 7 May , 2003Model : PC-X270Band: AM / FM (PLL RADIO)CD CASSETTE SystemPageTotal6 Pages GENERAL TEST CONDITIONOutput Load 3 ohm non-re

2、activeReference Output: 250 mWInput Signal Source: IRE LOOP for AM 75 ohm dummy for FMModulation : 30% 400 Hz for AM 22.5 KHz Deviation 1 KHz for FM 75KHz Modulation for FM MPXRemarks DC : 12VAC : 120V 60Hz * * * Subject to change without notice .Prepared byApproved bypage 1RadioFans.CN 收音机爱 好者资料库?

3、PERFORMANCE SPECIFICATIONSMODEL NO : PC-X270 Amplitude Modulation ( AM ) SectionTest Item Unit Nominal Limit#1#2A.01 Tuning RangeLOWKHz520+/-5HIGHKHz1710+/-5A.02 I.F. Frquency600KHzKHz450+/-5A.03 Sensitivity (AM Loop ANT.) (LOW TP)600KHzdB/m5868S/N 20dB (MID TP)1000KHzdB/m5866 (HIGH TP)1400KHzdB/m58

4、66A.04 Image Rejection1000KHzdB1400KHzdB3730A.05 S/N Ratio at 100dB/m Input600KHzdB35301000KHzdB35301400KHzdB3530A.06 I.F. Rejection(MW)600KHzdB4840A.07 AM Whistle Modulation910/1350KHz%-15A.08 Selectivity (+/-10KHz) (ACA)600KHzdB1000KHzdBA.09 AGC Figure of Merit (126dB)1000KHzdB4035A.10 Audio Respo

5、nse -6dB (AM:1000KHz)LOWHz70125HIGHKHz2K52KA.11 Distortion30% at Ref.1000KHz%1360% at Ref.1000KHz%510A.12 Modulation Hum (AC)1000KHzdB5040A.13 Overload (M=80% THD=10%)1000KHzmV/m100A.14 Min. Volume Hum and NoisemV0.71.2A.1510% THD Power(Mod:80%)(1-CH Load Only)( AC )W5A.16 Max. Vol. Audio Power Outp

6、ut (80% Mod)1000KHzWA.17 6dB Bandwidth at 20dB S/N1000KHzKHz4+/-3A.18 Auto Search Threshold600KHzdB/m60681000KHzdB/m60661400KHzdB/m6066A.19 OSC Dropout Voltage Max. Power (DC)1000KHzV8.410.8Fial Out Valtage (AC)1000KHz%70page 2? PERFORMANCE SPECIFICATIONSMODEL NO : PC-X270Frequency Modulation ( FM )

7、 SectionnTest Item Unit Nominal Limit#1#2F.01 Tuning RangeLOWMHz87.9+/-0.1HighMHz107.9+/-0.1F.02 Frequency Step200/100HzKHz F.03 I.F Frequency90.1MHzMHz10.7+/-0.09F.04 Sensitivity at -30dB S/N (MONO)90.1MHzdB/uM202898.1MHzdB/uM2028106.1MHzdB/uM2028F.05 3 dB Limit Sens98.1MHzdB1525F.06 Stereo Thresho

8、ld (Dev 75KHz)98.1MHzdB1525F.07 Overload98.1MHzdB110F.08 Image Rejection90.1MHzdB106.1MHzdB2518F.09 I.F. Rejection90.1MHzdB5040F.10 AM Suppression98.1MHzdB3024F.11 Spurious Suppression98.1MHzdBF.12 Selectivity at 98.1MHz +/-400KHz98.1MHzdBF.13 Audio Response -6dB 98.1MHzHz/KHz60/4K5100/4KF.14 Channe

9、l Separation (1KHz)98.1MHzdB3020F.15 Total Harmonic Distortion (60dB) Mono Ref.22.5KHz%13 Max Powe75KHz%1030F.16 Signal to Noise Ratio (Input 60dB)90.1MHzdB98.1MHzdB4540106.1MHzdBSTEREO S/N(INPUT 60dB) W/F B.P.F98.1MHzdB4030F.17 Auto Search Threshold98.1MHzdB2530106.1MHzdBF.18 Modulation Hum (AC)98.

10、1MHzdB4540F.19 AFC Holding Range98.1MHzKHzF.20 Min. Volume Hum & Noise98.1MHzmV0.71.2F.2110% THD Power(Dev 75KHz)(1-CH Load Only)( AC )98.1MHzW5F.22 Max Power98.1MHzWF.23 OSC Dropout Voltage Max. Power (DC)98.1MHzV8.410.8 (AC)98.1MHz%70page 3? PERFORMANCE SPECIFICATIONSMODEL NO : PC-X270AUX SCETION:

11、Test Item Unit Nominal Limit#1#2C.01 THD 10% Power Output (AC) ( 1-CH Load Only)1KHzW5C.02 Noise Level (Volume Max.)mV515C.03 Noise Level (Volume Min.)mV0.71.2C.04 Distortion1KHz%14C.05 S/N Ratio1KHzdB5545C.06 Separation1KHzdB3525C.07 Mute Effect1KHzdB5545C.08 Aux Cross Talk CD (Tuner) W/B.P.F1K/10K

12、dB5550C.09 Function Level Deference (450mV/500mV) INdB0+/-5(1KHz 0dB)CDdB0+1122.5KHz Mod.FMdB0-10(30% Mod)MWdB0-101KHz -4dB INPUTTape playdB00Recording CD -10dBTape R/PdB0+/-5C.10 Frequency Response100HzdB+-3+5/-31KHzdB002KHzdB+-1+/-310KHzdB+-1+/-3page 4? PERFORMANCE SPECIFICATIONSCD SECTION : PC-X2

13、70Test ItemsUnit NominalLimit#1#21Flat (Bass off)100HzdB0-310KHzdB+2-3Rock (Bass off)100HzdB+10+13 10KHzdB+5+1Jazz (Bass off)100HzdB-4-610KHzdB-3-5Pop (Bass off)100HzdB0-1010KHzdB0-8Classic (Bass off)100HzdB+1-510KHzdB+4-102HPS VR 50%100HzdB+10+53Frequency Response TCD-782100HzdB+3-310KHzdB+3-320KHz

14、dB+3-84Signal to Noise Ratio (Unweighted)1KHzdB60505Dynamic Range 1KHzdB60506Channel Seperation 1KHzdB45307Total Harmonic Distortion TCD-7821KHz(0dB)%25338Total Harmonic Distortion TCD-7821KHz(-10dB)%13.59Channel Unbalance TCD-7821KHzdB 310Short Access Time TCD-782Secs2411Long Access Time (Stop to T

15、R24) TCD-782444Secs51312Interruption TCD725Bum0.80.613Black DotTCD725Bum6514Finger PrintoTCD725Bum6515Output Power at 10% THD T112(AC)(1-CH Load Only)1KHzW516Max. Vol. Audio Power Output (0dB)1KHzW17Skip Test (Madonna,Bass/Surr ON)TR 17Vol.Max.NO SKIP18Min Volume Noise (SP OUT)TCD-782mV 3.519Max. Vo

16、lume NoiseTCD-782mV51220Eccentricity TCD-782um0.740.6321Vertical DeviationTCD-782mm8.610.822Dropout Voltage 0dB (DC)1 KHzV8.610.8 (AC)1 KHz%70page 5? PERFORMANCE SPECIFICATIONSCASSETTE SECTION : PC-X270Test Items TAPEUnit Nomina Limit#1#2T.01 Playback S/N Ratio (Unweighted)-12ABdB4535T.02 Playback T

17、HK-T118 (at Ref O/P)AB%13T.03 Channel Seperation (PB Only)-T141AB1KHzdB4030T.04 Track Crosstalk (PB Only)-T121AB1KHzdB4030T.05 Tape Speed Deviation-T111AB3KHzKHz4.75CM/S+-3T.06 L/R CH. DifferenceABdB0+-3T.07 Wow and Flutter-JIS weighted-T111ABP/B Only%0.35R/P-0.5T.08 Winding Time C-60 TypeABF.FewSec

18、s 170PlaySecs 170T.09 TorqueABRewindgm-cm35-70F.Fgm-cm75551KHzgm-cm7555T.10 P/R Dist. at Standard O/PA1KHz%27T.11 R/P Difference (CD-10dB 1KHz)A1KHzdB+3-3T.12 R/P Separation (W/1KHz BPF)AB1KHzdB3530T.13 R/P Cross Talk (W/1KHz BPF)AB1KHzdB4540T.14 R/P S/N Ratio (W/1KHz BPF)A1KHzdB6035T.15 R/P Erase R

19、atio (W/1KHz BPF)A1KHzdB6035T.16 R/P Channel BalanceA0+-3T.17 R/P Freq. Response 1KHz Ref125HzdB+-1+-36K3dB+-1+3/-6T.18 Min. Volume HumAPlaymV 3.5T.19 Max. Volume Hum & NoiseAmV3080T.20 Output Power at 10% THD-T112 0dB(AC)AB1KHzW5(1-CH Load Only)T.21 AC Bais FREQ.KHz65+0.5T.22 ALC Effect-65dB(-45dB

20、INPUT)ABdB05? ? ? ? ? ? ?page 6 IC &TRANSISTOR VOLTAGESMODEL : PC-X270 IC901 LA9242M(CD P/B MODE)Pin No.12345678910111213141516Voltage (v)2.572.572.612.612.552.502.552.502.502.572.572.572.502.502.702.52Pin No.17181920212223242526272829303132Voltage (v)2.502.502.502.502.5002.502.502.502.503.012.502.5

21、2.22.30Pin No.33343536373839404142434445464748Voltage (v)(play)05.0500.804.000.42.202.472.502.5602.502.610Pin No.49505152535455565758596061626364Voltage (v)(play)0.052.414.0600.024.9205.052.502.502.352.372.203.220.215.05 IC902 LC78622E(CD P/B MODE)Pin No.12345678910111213141516Voltage (v)001.4701.60

22、5.050.320.022.562.500.020.60000.051.40Pin No.17181920212223242526272829303132Voltage (v)05.05002.405.055.060000.045.050.040.042.350Pin No.33343536373839404142434445464748Voltage (v)(play)00.010.024.251.700.010.011.704.250.025.042.122.1100.10.15Pin No.49505152535455565758596061626364Voltage (v)(play)

23、0.12.500.042.501.850004.05.002.212.34000 IC903 LA6541D (CD P/B MODE)Pin No.12345678910111213141516Voltage (v)8.60.82.742.554.243.640003.804.002.562.645.058.015.00Pin No.1718192021222324252627282930Voltage (v)4.922.602.564.003.840003.963.902.562.502.568.6 IC701 LC587008 (CD P/B MODE)Pin No.1234567891

24、0111213141516Voltage (v)(stop)2.22.21.753.104.34.3004.272.204.3000.60.6Pin No.17181920212223242526272829303132Voltage (v)4.84.42.171.31.52.8904.31.72.24.64.64.81.30.050.05Pin No.33343536373839404142434445464748Voltage (v)(play)0.0504.34.32.44.31.61.5503.904.74.1000Pin No.4950515253545556575859606162

25、6364Voltage (v)(play)01.500002.22.22.22.22.22.22.22.22.22.2Pin No.65666768697071727374757677787980Voltage (v)(play)2.22.22.22.22.22.22.22.22.22.22.22.22.22.22.22.2 IC101 LA1823 (RADIO MODE)Pin No.12345678910111213141516AM Voltage (v)1.241.244.94.92.70004.84.91.241.240.54.30.360.151.26FMS Voltage (v)

26、1.241.244.94.92.540004.91.241.241.04.14.24.21.26FM Voltage (v)1.241.244.94.92.54004.84.91.241.240.164.14.24.21.26Pin No.1718192021222324AM Voltage (v)1.261.240.664.94.94.900FMS Voltage (v)1.261.241.064.94.94.900.8FM Voltage (v)1.261.241.14.94.94.900.8page1 IC102 LC72131 (RADIO MODE)Pin No.1234567891

27、0111213141516AM Voltage (v)2.4000.120.120.124.740.150.020000002.40FMS Voltage (v)2.4000.120.120.124.744.24.200000002.4FM Voltage (v)2.4000.120.120.124.84.24.200000002.4Pin No.171819202122AM Voltage (v)4.90.950.951.502.4備注 FM MO在88.1MHz時測得。FMS Voltage (v)4.90.90.92.202.4FM ST在87.9MHz時測得。FM Voltage (v

28、)4.90.90.92.202.4 IC201 BA3126N (TAPE MODE)Pin No.123456789Voltage (v)P/R0000/4.206.8/6.5000 IC501 LC75342 (TAPE/EQ at FLAT MODE)Pin No.12345678910111213141516Voltage (v)0.120.12005.35.35.35.35.35.35.35.35.35.300Pin No.1718192021222324252627282930Voltage (v)5.35.35.35.35.35.35.35.35.35.305.37.00.12

29、IC203 BA3308 (R/B MODE)Pin No.123456789 Voltage (v)1.8101.8201.015.71.8201.82 IC202 BA3416L (TAPE MODE)Pin No.12345678910111213141516Voltage (v) P/B00000.620.620.07006.91.917.323.23.300Voltage (v) P/A00000.620.620006.90.687.33.23.300Pin No.1718Voltage (v) P/B00Voltage (v) P/A00 IC301 BA5417 (P/B MOD

30、E)Pin No.123456789101112131415Voltage (v) P/B013.3713.7713.307.87.50.58000.5800 Transistors ( TUN MODE)Transistor No.Q101Q107Q108Pin NameBCEBCEBCEVoltage (V) 5.58.64.97.98.738.750.70.10 Transistors (CD MODE)Transistor No.Q906Q907Pin NameBCEBCEVoltage (v)7.88.58.70.70.10page2 Transistors (FM MODE)Tra

31、nsistor No.Q401Q402Q403Q404Pin NameBCEBCEBCEBCEPOWER ON(V)13.113.813.90.60.205.613.95.09.413.58.7Transistor No.Q406Q407Q506Pin NameBCEBCEBCEPOWER ON (v) 0.670.1307.27.97.969.413.78.8Transistor No.Q408Q409Q410Pin NameBCEBCEBCELAMP ON(V)0.670.1012.212.913.05.611.04.92 Transistors (CD P/B 100Hz MODE)Tr

32、ansistor No.Q303Q304Q501Q502Pin NameBCEBCEBCEBCEMAX VOL(V)0.6008.18.28.75.85.25.25.85.25.2MIN VOL(V)08.005.18.18.705.25.205.25.2Transistor No.Q512Q301Q302 Transistors (TAPE MODE)Pin NameBCEBCEBCETransistor No.Q214MUTE ON(CD,TUN)03.200.64000.6400Pin NameBCEMUTE OFF(V)0.600000000Voltage (V)8.313.07.7T

33、ransistor No.Q205Q208Q801Q802Q803Pin NameBCEBCEBCEBCEBCEVoltage(V) PLAY / / /07.60 / / / / / /0.14.70Voltage(V) REC.0.60.104.76.84.21.05.80.40.6000.600 Transistors (TAPE MODE) Transistors (TUN MODE)Transistor No.Q203Q204Transistor No.Q105Q106Pin NameBCEBCEPin NameBCEBCEVoltage (V) PLAY0.600 / / /Vol

34、tage(V) AM / / /0.600Voltage (V) REC.04.206.06.76.8Voltage(V) FM1.32.30.60.60.10Transistor No.Q904Q903Q908Q914Pin NameBCEBCEBCEBCEVoltage(V) PLAY0000007.84.988.53.31.84.0Voltage(V) STOP0.6000.6007.95.08.54.21.54.8Transistor No.Q705Q706Q707Q708Pin NameBCEBCEBCEBCEPOWER ON (V)04.404.904.34.302.504.30p

35、age3LA1823Block Diagram123456789101112242322212019181716151413AMRFAMMIXAMOSCOSCBUFFERFMMIXFMOSCIFBUFFERFMIFAMIFFMS-METERAMDETPHASECOMPMUTEVCC2GND2REGVCC1GND1AGCSTTRIGST SWVCODECODERFFFFFFSDPILOTDETFMDETFMRFLevel shift1Level shift2Level shift4Level shift3RegulatorLA6541DBlock diagram1 FIN22 FIN13 E4

36、F5 TB6 TE-7 TE8 TESI9 SCI10 TH11 TA12 TD-13 TD14 JP15 TO16 FD17 FD-18 FA19 FA-20 FE21 FE-22 AGND23 NC24 SP25 SPG26 SP-27 SPD28 SLEQ29 SLD30 SL-31 SL+32 JP-33 JP+34 TGL35 TOFF36 TES37 HFL38 SLOF39 CV-40 CV+41 RFSM42 RFS-43 SLC44 SLI45 DGND46 FSC47 TBC48 NC49 DEF50 CLK51 CL52 DAT53 CE54 DRF55 FSS56 Vc

37、c257 REF158 VR59 Lf260 Ph161 BH162 LDD63 LDS64 Vcc1PIN FUNCTIONLA9242MEquivalent Circuit Block DiagramVCC1LDSLDDBH1PH1LF2VRREF1VCC2FSSDRFCEDATCLCLKDEF64636261605957565855 54 53 52 51 5049484746454443424140393837363534333231302928272625242322212019181716151413121110987654321FIN2FIN1EFTBTE-TETESISCITH

38、TATD-TDJPTOFDAPCRF DETI/VVCAVCABALTE+-T.SERVO & T.LOGICF.SERVO & F .LOGICSPINDLE SERVOSLED SERVORF AmpSLCREFU-COMINTER FACE+-+-+-+-+-+-+-+-FD-FAFA-FEFE-AGNDNCSPSPGSP-SPDSLEQSLDSL-SL+JP-NCTBCFSCDGNDSLISLCRFS-RFSMCV+CV-SLOFHFLTESTOFFTGLJP+LC72131 (IC102)AM/FM PLL FREQUENCY SYNTHESIZERPin Assignments N

39、o. 5480-2/29LC78622EEquivalent Circuit Block DiagramPin AssignmentAddressSystem Block Diagram for the LC587008LC587008 Single-Chip 4-Bit Microprocessors with LCD Driver, 2 KB RA M, and 16 KB ROM on chipPin No.FunctionOptionAt resetVDDVSS2423Power supplyV DD12VDD2221LCD drive power supplyNON1/1 bias1

40、/2 bias1/3 biasVDDVDD1VDD2VSSCUP1CUP234Switching pin used to supply the LCD drive voltage to the VDD1 andV 2 PINSDDConnect a nonpolarized capacitor between CUP1 and CUP2 when1/2 or 1/3 bias is usedLeave open when a bias other than 1/2 or 1/3 is used.CFINInput25System clock oscillator connectionsCera

41、mic resonator connection (CF specifications)RC component connection (RC specifications)External signal input pin (CFOUT is left open)This oscillator is stopped by the execution of a STOP or SLOWinstruction.CF specificationsRC specificationsExternalSpecificationsNot usedCFOUTOutput26XTINInput20XTOUTO

42、utput19Referenc e calculation(cl ock specification s,LCD alternain g frequency),system clock oscillator32 kHz crystal resonator connection65 kHz crystal resonator connectionThis oscillator is stopped by the execution of a STOP instruction.65k specifications32k specifications38k specificationsNot use

43、dS1S2S3S4Input27282930Input-only portsInput pins used to read data into RAMBuilt-in 7.8 ms and 1.95 ms chatter rejection circuitsBuilt-in pull-up/pull-down resistorsNote: The 7.8 ms and 1.95 ms times are the times when f0 is 32.768kHz.Transistor to holda low or high levelSelection of eitherpull-up o

44、r pull-down resistorThe pull-up or pull-down resistor areon.These pins goto the floatingstate whenreset is cleared.Note:K1K2K3K4I/O31323334I/O portsInput pins used to output read data into RAMOutput pins used to output data from RAMBuilt-in 7.8 ms and 1.95 ms input-mode chatter rejection circuits.Th

45、e selection of 7.8 or 1.95 ms is linked to that for the S ports.Note: The 7.8 ms and 1.95 ms times are the times when f0 is 32.768 kHz.Transistors to holda low or high levelSelection of eitherpull-up or pull-down resistorThe pull-up or pull-down resistors areon.These pins goto the floatingstate when

46、reset is cleared.Note:Input modeOutput latch data isset high.M1M2M3M4I/O35363738I/O portsInput pins used to read data into RAMOutput pins used to output data from RAMM4 is used as the external clock input pin in Tm2 mode 3.*The minimum period for the external clock is twice the cycle time.Built-in p

47、ull-up/pull-down resistorsThe same as K1 to K4The same as K1 toK4A1A2A3A4I/O11121314I/O portsInput pins used to read data into RAMOutput pins used to output data from RAMBuilt-in pull-up/pull-down resistorsThe same as K1 toK4The same as K1 toK4P1P2P3P4I/O15161718I/O portsFunction: The same as pins A

48、1 to A4The same as K1 to K4The same as K1 toK4PinI/OQIP-80Pin No.FunctionOptionAt resetSo1So2So3So4I/O78910I/O portsFunction: The same as for pins A1 to A4Pins So1 to So3 area also used for the serial interface.Use of these pins inserial mode can be selected under programcotrol.Pin functions: SO1:Se

49、rial input pin SO2:Serial output pin SO3:Serial clock pinThe serial clock pin can be switched between internal and external,and between rising edge output and falling edge output.Transistors to holda low or high levelSelection of eitherpull-up or pull-down resistorsInternal serial clockdivisor selec

50、tionThe same as for K1to K4I 1/1II 1/2III 1/4N1N2N3N4Output39404142Output-only portsOutput pins used to output data from RAMAn alarm signal can be output from pin N4.(Note that this is onlywhen the N4 output latch is low.)An alarm signal modulated at 1,2 or 4 kHz can be output.(Thesefrequencies are