Pioneer-SX424-rec-sm 维修电路原理图.pdf

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1、t.,ISnrri*%*JAM/FM STEREO RECEIYERSx-424/ nuw, FvzwNOTEMODEL 5X.424 COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS:Round label onrear panelVoltageTVpeKUWFVZW120V only5-position selectorUL approved (U.S.A.)FTZ approved (West Germany)(72co3MoD, lloNEElilRadioFans.CN 收音机爱 好者资料库sx-424CONTENTS1. SPECI F

2、ICATIONS .2. FRONT PANE L FACILITIES3. CONNECTION DIAGRAM4. DISASSEMBLY5. PARTS AND PCB LOCATIONTOP VIEW . .BOTTOM VIEW6. DIAL CORD STRINGING7. ALIGNMENT PROCEDURE1357III7.1 FM/AMIFAL|GNMENT. .107.2 FM/AMTACKINGALIGNMENT 107.3 MpX DECODER AL|GNMENT . . 117.4 OTHER ALIGNMENT . 118. PACKING METHOD AND

3、 PART NUMBERS. . 129. SCHEMATIC DIAGRAMS, PCB PATTERNS AND PARTS LIST9.1 UNIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS 139.2 TUNER UN|T (AWE-008) . 199.3 AF UN|T (AWK-OI I . 25RadioFans.CN 收音机爱 好者资料库siX-4241. SPECIFICAT|ONSSEMICONDUCTORSFETs 1Transistors. .30Diodes .21AMPLIFIER SECTIONMusic Power

4、Output (lHF) 50W (4O)37w (8s,)Continuous Power Output 18W18W (4O)(1kHz each channel driven) t 4Wl14W (8O)Continuous Power Output 13W + 13W (4O)(lkHz both channels driven) t2W + 12W (8Sl)Harmonic Distortion Less than 1%(Continuous power output)lntermodulation Distortion Less than 1 %(Continuous power

5、 output)Power Bandwith (lHF) 2OHz to 45kHz (8O, Harmonic distortion less than- 1%lFrequency Response 2OHz to 70kHz, t3dBSpeakers 4 to 16SlDamping Factor 40 (8O, l kHz)lnput Sensitivity/lmpedance PHONO MAG 3mV/50kOM lC 4.5mV/50kOAUX 180mV/100kS,TAPE MON ITOR 180mV/100k,C1TAPE MON ITOR tDlN) 180mV/100

6、kORecording Output TAPE REC (Pin Jack) 180mVTAPE REC (DlN connector) 36mVBASS Control -gdB, +9dB/100H2TREBLE Control -gdB, +6dB ll0kHzEqualization Curve PHONO: R IAA S.T.D.Loudness Contour +9.5d8/100H2, +5.5d8/1OkHz with Volume Controlset at -40d8 position.Hum and Noise (lHF) PHONO: More than 75dBAU

7、X: More than 85dBFM TUNER SECTIONFrequency Range 88MHz to 108MHz87.5MHz to 108MHz IFTZ approved)Usable Sensitivity (lHF) 2.31tVCapture Ratio (lHF) 3.5dBlmage Rejection More than 50dB (98MHz)lF Rejection More than 80dB (90MHz)Spurious Rejection More than 70dB (98MHz)AM Suppression 45dBSignal-to-Noise

8、 Ratio 65dBHarmonic Distortion Mono: less than 0.6% ll00o/o Mod.)Stereo: less than 0.8% (100% Mod.)Tuning lndicator Signal strength typeStereo Separation More than 40dB (1kHz)Sub Carrier Suppression More than 35dBNoise Filter Switchable to ON-OFFAntenna lnput lmpedance 300O balanced and 75O unbalanc

9、edAM TUNER SECTIONFrequency Range 525kHz to 1,605kH2Usable Sensitivity (lHF) 15pVlmage Rejection More than 45dB (1,000kH2)lF Rejection More than 35dBSiEnal-to-Noise Ratio More than 50dBAntenna Built-in ferrite loopstick antennaMISCELLANEOUSPowerrequirements 12OV 60H2, 22OV 50-60H2 or 110V, 120V, 13O

10、V22OV and 240V. (switchable) 50-60H2Power Consumption 90W (Max.)AC Outlets Switched 1, Unswitched 1.Dimensions (overalll 16-31 /32in.1431 mm (width)5-314 in.l146 mm (height)13-21 132 in.l347 mm (depth)Weight (Without package) 16|b, 8ozl7.5 kg (120 voltage model)17 lb,6oz17.9 kS(Witfr package) 20 lb,

11、 14ozlg.5 kg (120 voltage model)21 lb,13ozl9.9 kgFurnished Parts FM T-type Antenna 1Fuse: 1A 10.5A (5 line voltage model only) 2Pin Plug 24Speaker PlugPolishing Cloth 1Operating lnstructions 1NOTE: Specif ication and the design subject to possible modification without notice dueto improvementso.4.o1

12、.ct$4. DISASSEMBLYNumbers indicate order of disassemblyRemove 4 screws from both sides of woodencase.Pull off all knobs, then remove nuts andwashers from shafts of SPEAKERS, TRE-BLE, and SELECTOR.Remove 2 serews from top of front panel.Remove 8 screws from bottom plate ofreceiver.e$p_*p J/&go Number

13、s indicate order of disassembly.5. PARTS AND PCB LOCATIONTOP VIEWPOWER TRANSFORMERATT-063-0 (KUW)4TT-064-0 (FVZW)TUNER UNITAWE-008-0=gw*ot9 Io lg,=goP Hg,o oftELECTROLYTICCAPACITORc52-O74-BAF UNITAWK.O14-ADIAL SHAFT ASSYM42-O71-FBOTTOM VIEWFUSE HOLDERAKR-OOs-O IKUWLINE VOLTAGE SELECTOBAKR.OOI.O FVZW

14、)OUTPUT SELECTORASA-017-0 KUWASA.O28-O (FVZW)SiX-48241.2.3.4.6. DIAL CORD STRINGINGSet the tuning capacitor to maximum capa-citance.Tie one end of the string to the spring on thetuning pulley.Pull the string around the small pulley A.Lead the string around the small pulleys Band C, then wind it 3 tu

15、rns around thetuning shaft.Wind the string 2 turns around the tuningpulley.Finally, tie the end of the string to remain-ing side of spring on the tuning pulley.Thne receiver to low end. Fasten dial pointerto string so that indicates low end on dialscale.5.6.7.DIAL POINTERTUNING SHAFTTUNING PULLEY7.

16、ALIGNMENT PROCEDUREREOUIRED INSTRUMENTS. FM/AM Signal generatoro FM/AM Sweep generator: Center frequency10.7MH2, 455kIz. Oscilloscope. AC VTVM. FM multiplex signal generator preferbly withRF output7.1 FM/AM IF ALIGNMENTO FM SECTIONa) Connect a 0.01pF capacitor between TP1and ground before the alignm

17、ent.b) Connect a ZZOkdL resistor in series with thevertical input terminal of the oscilloscope.c) Remove. the meter lead from terminal 18,then terminate a 4.7kQ resistor betweenterminal 18 and ground.d) Connect the vertical input to terminal 18.e) Set the selector switch to FM MONO.f) Connect the ou

18、tput lead of the sweepgenerator to the FM antenna terminals.g) Set the output level of the sweep generatorto 90dts.h) Adjust the primary and secondary cores ofT6 to obtain a symmetrical pattern.i) Set the output level of the sweep generatorto 70d8.j) Adjust the cores of T4 and T5 for maxi-mum gain a

19、nd symmetry of the pattern.k) Vary the output level of the s$/eep ger a-tor from 60dB to 100dB, then keep the topof the pattern flat and make sure that thecenter frequency does not drift. If it drifts,repeat steps (g) to (j).l) Remove the capacitor (4.71tF) from ter-minal 28.m) Disconnect the vertic

20、al input from terminal18, then reconnect it to TP1.n) Set the output level of the sweep generatorto 7OdB.o) Observe the S-curve pattern when adjustingthe cores of T7. (Linearity is improved bythe primary core; symmetry by the second-ary core.)p) Disconnect the 0.01trtF capacitor from TPlafter the al

21、ignment has been completed.q) Connect the capacitor (4.7trtF) to terminal28 after the alignment has been eompleted. AM SECTIONa) Turn the selector switch to AM.b) Connect the output lead of the sweepgenerator to the AM antenna terminal.c) Connect the vertical input of the oscillo-scope to the TAPE R

22、EC jack.d) Set the output level of the sweep generatorto 75d8.e) Adjust the IFT cores (T9, T10, T11) asshown in Fig. 1, for maximum gain andsymmetrical pattern.7.2 FM/AM TACKINGALIGNMENT. FM SECTIONa) Turn the selector switch to FM MONO.b) Connect the output leads of the FM signalgenerator to the FM

23、 antenna terminals.c) Set the FM signal generator to modulation4O0Hz, 30Vo and output level 15dB fre-quency 90MHz; also set the receiver dial at9OMHz.d) Conneet the VTVM and oscilloscope (inparallel) to the TAPE REC jack.e) Observing the output level on the VTVM,adjust the following cores for maximu

24、mreading on the meter.Tg . OscillatorcircuitT1 . AntennacircuitT2 . RFcircuitf) Set the frequency of the FM signal gene-rator and the receiver dial to 106MHz.g) Adjust as follows:Trimmer capacitor CT3: Oscillator circuitTrimmer capacitor CTl . . Antenna circuitTrimmer capacitor CTz . RF circuith) Re

25、peat steps (e) to (g) several times.i) Set the output level of the FM signalgenerator to maximum signal meter deflec-tion.j) Adjust the primary core of T7 for mini-mum sound distortion.10. AM SECTIONa) Turn the selector switch to AM.b) Connect the AM signal generator to theAM antenna terminal.c) Set

26、 the AM signal generator to modulationAOOHz,30%, output level 30dB, frequency600kHz. Set the receiver dial at 600kHz.d) Connect the VTVM and oscilloscope (inparallel) to the TAPE REC jack.e) Observing the output level on the VTVM,adjust the following cores for maximumreading.T8 . OscillatorcircuitFe

27、rrite loopstic antenna: Antenna circuitf) Set the AM signal generator and the re-ceiver dial to 1,400kH2g) Observing the output level on the VTVM,adjust the following cores for maximumreading.cT5 .cT4 .h) Repeat alignments (e) to (g) several times.i) After these alignments, lock the trimmercapacitor

28、 with paint.7.3 MPX DECODER ALIGNMENTa) Modulate the FM signal generator outputby FM MPX modulator.b) Turn the selector switch to FM AUTO.c) Connect the FM signal generator to the FMantenna terminals.d) Set the FM MPX modulator to modulation;main lkHz (L+R) 6OVo, pilot 8 - LOVo.e) Set the output lev

29、el of the FM signalgenerator to 60dB.f) Turn the tuning knob to maximum readingon the signal meter.g) Set the modulation of the FM MPXmodulator to pilot only.sx-424h) Connect the oscilloscope to TP2.i) Adjust the transformere (T13, T14, T15)until the output level of the 19kHz be-comes maximum on the

30、 scope.j) Set the FM MPX modulator to pilot with Lor R signal.k) Connect the dual-trace oscilloscope andVTVM to the TAPE REC jacks.l) Adjust the semi-fixed potentiorneter on thetuner unit until the output level of the L orR signal becomes maximum on the scope.7.4 OTHER ALIGNMENTo CHECKING THE SCA FI

31、LTERa) Connect the FM signal generator to the FMantenna terminals.b) Modulate the FM signal generator con-nected to the audio generator, check thatthe frequency response shows troughs ataround 67 kHz and. 7 ZkHz.o CHECKING THE STEREO INDICATORa) Connect the FM signal generator to the FMantenna termi

32、nals.b) Turn the selector switch to FM AUTO.c) Modulate the FM signal generator con-nected to the FM MPX modulator, and setthe FM MPX modulator pilot on. Ctreckthat the stereo indicator lamp goes in.Then set the FM MPX modulator to pilotoff, and check that the stereo indicatorlamp goes out.ogr.,oo o

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