Pioneer-SX750-rec-sm 维修电路原理图.pdf

l* *.*.*-.-*BE t Eb E : balt frF(DrrroNEEFrRadioFans.CN 收音机爱 好者资料库-sx-75ctThis Service Manual is applicable only to the KC, KU model.CONTENTS1. SPECIFICATIONSBLOCK DIAGRAMFRONT PANEL FACILITIES5791 12.3.4.5.CONNECTION DIAGRAMCIRCUIT DISCRIPTIONS5.7 Protection Circuit5.6 Tone Control5.9 Power Supply5.8 Power Amplifier Circuit5.3 FM Muting Circuit5.5 Microphone Circuit5.4 Phono Equalizer Amplifier5.1 AM Tuner5.2 FM TunerDISASSEMBLY131315151515161717181920216. ADJUSTMENTS6.1 AM Section6.2 FM Section6.3 MPX Adjusrment6.4 Power Amplifier Section7.8.9.10.DIAL CORD STRINGTNG22232425272931333537383940414243LEVEL DIAGRAMPARTS LOCATION10.1 Front Panel View1O.2 Front Panel View (with removd front panel)10.3 Top View10.5 Rear View10.4 Bottom View1I. EXPLODED VIEW11.1 Part I11.2 Part ll1 1.3 Part I ll11.4 Part lV11.5 Part V1 1.6 Part Vl11.7 Part Vl IRadioFans.CN 收音机爱 好者资料库4411.8 Packing.12. SCHEMATIC DIAGRAMS P.C. BOARD PATTERNS ANDPARTS LIST12.1 SchematicDiagrams12.2 MiscellaneousParts12.3 Internal Circuitry of Integrated Circuits . . 4812.4 Filter& Muting Assembly (AWM-094) . 5012.5 Tone Control Assembly (AWG-046) .- 5212.6 Power Amplifier Assembly (AWH-046) 5412.7 Power Supply & Protection Assembly (AWR-099) . . . 58P.A Power Supply Assembly (AWR-1001 6212.9 Headphone Jack Assembly (AWX-106) . 6412.10 Tuner, AF & Control Assembly (AWE-073) . 6512.11 Amplifier Assembly (AWK-065) 7312.12 De+mphasis Switch assembly (AWXO95 .-.-. 744547-1. SPECIFICATIONSSemiconductorsFETlCsT r a n s i s t o r s . . . . .D i o d e s . . . . . . . .Amplifier SectionContinuous Power Output from 20 Hertz to 20,000 Hertz(Both channels driven) . . 50 watts per channel (8 ohms)60 watts per channel (4 ohms)Total Harmonic Distortion(20 Hertz to 20,000 Hertz, from AUX)Continuous Rated Power Output . . . No more than O.1o/o25 watts per channel poweroutput,8 ohms . . No more than 0.05%1 watt per channel Poweroutput,8 ohms . . . No more than 0.05%lntermodulation Distortion(50 Hertz: 7,000 Hertz=4:1, from AUX)Continuous Rated Power Output . . No more than 0.1%25 watts per channel poweroutput,8 ohms . . . No more than 0.05%1 watt per channelpowero u t p u t , 8 o h m s . . . . . . . .Damping Factor(20 Hertz to 20,000 Hertz) . .Input (Sensitivity/ lm pedance )PHONO . . 2.5mV/50k ohmsl 4 1 C . . . . . . . 5 m V / 5 0 k o h m sA U X . . . . . 1 5 0 m V / 5 0 k o h m sT A P E P L A Y 1 . . . . . . 1 5 0 m V / 5 0 k o h m sT A P E P L A Y 2 . . . . . . 1 5 0 m V / 5 0 k o h m sTAPE PLAY 2 (DlN connector) . . . l50mV/50k ohmsPHoNo overload t tt n o .o. t.:l . . 200mV (1kHz)Output (Level/l mpedance)T A P E R E C I . . . . . . . . . . . . .T A P E R E C 2 . . . . . . . . . . . . . . . 1 5 0 m VTAPE REC 2 (DlN connector) . 30mV/80k ohmsS P E A K E R . . . . . . . A , B , A + BHEADPHONES. . . . Low lmpedanceFrequency ResponsePHONO (RIAA equalization). . . . . . 30 Hertz to 15,000 Hertz !O.2dBAUX, TAPE PLAYl0 Hertz to 50,000 Herrz .-? dBI742. . . . . 4 0Tone ControlB A S S . . . . .T R E B L E . . . . +8dB, 7dB (100 Hz). . +9d8, 7dB (10 kHz)F ilterH | G H . . . . . . 6 k H z ( 6 d B / o c t . )Loudness Contour (Volume control setat 40dB position) . . . . +6dB (100 Hz), +3dB (10 kHz)Hum and Noise(lH F, short-circuited, A Network, rated power)P H ON O . .70dBA U X , T A P E P L A Y . . . . . . . . . . . . . 9 O d BFM Sectionusable sensiriviry l4oNo . . . . . . . . . 10.7d8f (1.99v)S T E R E O. . . 19.0dBf (9.8sV)50dB Quieting Sen5itivityi 4ON o. . 17.2dBf (4.0pV)S T E R E O. . 39.2dBf (50gV)Signal to Noise Ratio at 65dBfM O N O . . . . . . . 7 2 d 8S T E R E O . . . . . 6 7 d 8D i s t o r t i o n a t 6 5 d B f l 0 0 H z . . . M O N O . . . . . . . . O . 1 5 y .S T E R E O . . . . . . . O . 3 y ol k H z . . . . M O N O . . . . . . . . O . 1 5 Y oS T E R E O . . . . . . . O . 3 v .6 k H z . . . . l v l O N O . . . . . . . . O A %S T E R E O _ . . . . . . 0 A %Frequency Response . -. . 30Hz to 15,OO0Hz +-8:E dBC a p t u r e R a t i o . . . . . . . . . 1 . 0 d 8A l ternateC hannel sel ecti vi ty . 80dBS p u r i o u s R e s p o n s e R a t i o . . . . . . . . . . 9 0 d 8l m a g e R e s p o n s e R a t i o . . . . . . . . . . . . 8 0 d Bl F R esponse R ati o . .100d8A l V l S u p p r e s s i o n R a t i o . . . . . . . . . . . . 5 5 d 8l4 uting Threshold ladBf (2.8t/V)Stereo Separation . . 40dB (l kHz), 30dB (30H2- l5kHz)S u b c a r r i e r P r o d u c t R a t i o . . . . . . . . . . 6 2 d BS C A R e j e c t i o n R a t i o . . . . . . . . . . . . . 6 2 d BAntenna lnput .300 ohms balanced75 ohms unbalanced150mV5six-75cAM SectionSensilivity (lH F, Ferrite antenna). .(lH F, Ext. antenna)SelectivitySignal to Noise Ratio . . . .lmage ReiectionlF RejectionA n t e n n a . . . . . . . . . . B u i l t - i n. . . . . . 6 5 d BFerrite Loopstick Antenna. . 13.7kg(30 lb 2 oz)l s.3kg (33 lb 1 1 oz).300s V/m. . . . 1 5 t t V. . . . 35dB. . . . 50dB. . . . 40dBMiscellaneousPowerRequirements. .120V,60H2Power Consumption 160W (UL), 350W (max.)Dimensions . 480(W) x 149(H) x 371(D)mm18-718 (w) x s-7l8(H) x 14-sl8(D)in.W e i g h t w i t h o u t p a c k a g e . . . . . . . .with packageFurnished PartsFN4 T-type Antenna .Operating InstructionsNOTE:Specifications and design subject to possible modificotionwithout notice, due to improoements.2. FRONT PANEL FACILITIESPOWER INDICATOR LAMLights when SPEAKERS switch is moved to any positionfrom POWER OFF, and AC power is supplied to thereceiver.SPEAK.ERS SWITCHFunctions both as power switch and speaker selectionswitch.POWER OFF: AC power is off.A:OFF:B:A i B :PHONES OUTPUTInsert headphone plug into this jack when headphonelistening is desired. In this case, SPEAKERS switch shouldbe in OFF position.BASS, TREBLE CONTROLSFor tone adjustment when TONE switch is in ON posi-tion. When knobs are turned clockwise from 0 position,response in bass or treble range, respectively, is boosted.Turning counterclockwise attenuates response.TONE SWITCHControls ON-OFF ooeration of tone control circuit. ln theON position, tone control by means of BASS andTREBLE knobs may be accomplished. In the OFF posi-tion, the tone control circuit is bypassed and frequencyresponse in high and low ranges is flat.HIGH FILTER SWITCHFor high frequency noise due to scratches on the record,place switch in 6kHz position. This will provide 6dB/octave attenuation at frequencies above 6kHz. For normaloperation switch should be in OFF (upper) position.Sound will be heard from speakers con-nected to A speaker terminals.No sound will be heard from speaker sys-tems. This position should be used whenlistening with headphones.Sound will be heard from soeakers con-nected to B speaker terminals.Sound will be heard from speakers con-nected to A terminals and from speakersconnected to B terminals.STEREO INDICATOR LAMPLights when FM stereo broadcast is being received.(D rIONCGT. BTEPEAKEFg.* ;l?.BALANCE CONTROLFor adjustment of relative output levels of L and Rchannels of speaker systems or headphones. Clockwiserotation from center position increases volume of R overL channel. Counterclockwise rotation increases volume ofL channel over R.VOLUME CONTROL,For adjustment of speaker or headphone output level.Level increases with clockwise rotation of knob-LOUDNESS SWITCHSIGNAL METERFor FM and AM reception,needle of the SIGNAL meterthe right.turn TUNING knob untilis deflected a maximum tolevel, placing this switch inresponse in low and highFALANCIFM TUIWith thrright, fiTUNIN(MODEFor selplaybacSTERE(channelspeaker:NOTE:RecordiMONO,rate.DUPLICWith sutwo taponto thoperaticFor listening at low volumethe ON position will boostfrequency ranges.The response of the human ear to low and high soundvolumes is different. At low volume levels, the ear isrelatively insensitive to sounds at either extreme of thefrequency scale. By means of the LOUDNESS switch,these sounds are given additional amplification.luutJFM lillmilillrilAM 55, $ ? , 9 4 , 9 6 , 0 g , 1 0 0 , 1 0 2i l l i l r l t l | l t l i l l t r I r l i l t t l i l t t l i l t l | i l t r n , t r t t i l i l l i t i l t i l t lii.FM TUNING METERWith the needle of the SIGNAL meter deflected to theright, fine-tune FM broadcast by centering needle ofTUNING meter.PROGRAM SOURCE INDICATORSIndicate program source selected by means of FUNCTIONswitch.TUNING KNOBFor selection of FM or AM stations.FM MUTING BUTTONFoi selection of FM broadcasts, button should be in ON(released) position.When button is in ON position, unpleasant interstationnoise is suppressed. When signal strength is poor, it maynot be possible to bring in the desired station if MUTINGis ON. In this case, press button to place it in the OFFposition.FUNCTION SELECTORFor selection of program source.AM:FM:AM broadcastsFM broadcastsPHONO: Playing recordsAUX/MIC: For use of component connected at AUXterminals of receiver, or microphones whichmay be plugged into Mlc jack.NOTE:AUX and MIC program sources cannot be used simul-taneously. When using AUX hi-fi component, micro-phone should be dbconnected.rc JAcKAccepts standard 6mm plug. Microphone input signalenters both R and L channels.TAPE MONITOR SWITCH1: For program sources other than tape deck(playback).(REC or PLAY).SOURCE: For program sources other than tape deck(playback).2: For monitoring of playback or record modeof tape deck connected to TAPE 2 terminals(REC or PLAY).NOTE:When not monitoring record or playback mode of a tapedech, switch should be in SOURCE position. In position1 or 2, the program source indicated by the FUNCTIONselector will not be heard through speaher sysfems orheadphones.i,1 , , t* ;s-and Rockwise R overlume ofrt level.vitch innd highl sound3 ear isr of theswitch,to*s ueoiwer: !MODE SWITCHFor selection of stereophonic or monophonic mode ofplayback. In normal operation, switch should be inSTEREO position. In the MONO position, R and Lchannel signals will be mixed, and sounds coming fromspeakers of both channels will be the same.NOTE:Recording stereophonically with the MODE switch in theMONO position may cause channel separation to deterio-rate.DUPLICATE SWITCHWith switch in ON position, signals recorded on one oftwo tape decks connected to the receiver may be recordedonto the other, with or without editing. For normaloperation, this switch must be in OFF (upper) position.al i l l l l l l l l l l l r l l l l3. CONNECTION DIAGRAMREAR VIEWOutdoor FM antennaCenter wire-tlmesh75 ohm coaxial cableindoor or outdoorlkA*ryANTENNA PLACEMENTMake note ot rhe lollowingponts when choosing e locationfor the FM antenna.300 ohm leeder cableDirection ot signals1.5 meter (5 ft.) aboveMore than 4 meters(15 ft.) above groundPlease see tollowing section, Antenna and GroundConnections, for instructions regarding Fl/1 antennaFM do-rmph6i5 3witch: For normal FM recebtion rhis switchshorrld be set on 75!S (unir is set to rhis when leaving factory).The 25pS setting is used only when listening to FM Dolby*transmissaons. When listening ro FM Dotby transmissions, it wi benecessary lo use an NR adaptor wiich can be purchased separately.More detailed instructions witt be found in the section, ,FM DotbvReception.Antenna should nottte placed where itwill be subiect to elec-tracal interlerencefrom motor vehicles.Fig. Isr L_t6 E EB E A t rFeeder wire and cSle a Length should b ashould be insulated at short as possible.mounting points, a Feeder wire should notb coiled.TOP VIEWsix-750Accessory AC outlets:Switched . Power to this outlet is controtted by the SX-750powr switch. Whn power to the receiver is On, this oudet willprovide AC currenr 10O watts maxamuml.Unslvitchod. Power to this outlet is not controtted by the SX,75Opower swilch. As long as the power cord is plugged into a tiveoutlet, this outlet will supply AC current maximum 300 warts).AC outltsL channel R chrA SPEAKER SYSTEMSL channelmR channelm0000 0 000000000| 0 0 000 000 rt000000000000000000000000000000|0000000B SPEAKER SYSTEMSCarrridg tape deckTape deckFig.24. BLOCK DIAGRAMANTENNAFI1 TSQFM 300siG N DAf1IF ampCF . HA12O1 CFHAl 13 ?T410614P Ratio detecfonSIGNAL meterv l uCONTROL SECTIONTAl136P1TAl 1 36PiA11 TUNER*,;t-lAMPTA1136Pl !IlIC AH Pc! c!3 5Tone controlONIIEQt-rF,#rr=U)(./)(-/)p-.aONOFFIIIIIIIII=U)IYP=t-rlo_g1-lIIIIIJ7ILPHONORLAUX nKtl lc0 N 6 . lOFFt,16ng gQnTfolONDC POWER SUPPLY.l,aF: ; - ;/AAF.0.l8Nylon sheet /-ABcDABcD11.7 PART VIINOTE:Parts indicated in green type cannot be supplied.Screw 3x8ABA-057Although there are some units in the SX-?60series which do not contain green line encircledcobponents, this is not an error.AC power cordADG-OO5Strain reliefAEC.079Screw 3x10ABA.082r1,).IBIITScrewABA-OO2YTScrew for groundAKE.O17AC socket (OUTLETS)AKP.OO4Amplif ier assemblyAWK.O65*#Terminal (antenna)AKA-OO2ABcDABcD4311.8 PACKINGOperati ng i nstructionsARB.174FM T-type antennaADH-OO2six-7EclSide padAHA.112Packing caseAHD-357 (KU model)AHD-358 (KC modellVinyl bagEI1-O24I2.SCHEMATIC DIAGRAMS. P. C. BOARD PATTERNS AND PAR112.1 SCHEMATIC DIAGRAMSTUNER s AF Assy AwE -0?3AUXiS,v-lLctt I soxoI HXol150KOSWITCHES;Sr FuNclor: Sr| .At12 Ft13 Pt-roNo 55+ AUX / tltcSz TAPE MONITOR Ss1- ffir-2r, SrSs DUPLICATE9il -orl,SaRESISTORS:lN 0Hl1 , I /4 tf , .t 5 7o TORELANCECAPACITORS :lN,4 F UNLESS GTHERWISE NOTEDNOTES :oeTA?l36Pli ?32trf100E Ss,Qf;$!,nt1,:ffi310: r r : ,: ,:,: ,r.$,o,riouoness I9!T* ON 3TONE 49E- 0N 5HIGH FILTER9!E -oN SFM I,IUTING0N - OFFUNLESS OTHERW|SE NOTED K : KOP : P FLPHOll0r+dR!il, 4EVR4BAl.AilCE COTTRoLL-);r VRs$TLUI,IES)rrRoL.?*-l.l lvRslRELAYSF,EAI(EB,PO|JER OFFS P ASP OFFS P BSP 6+ 3OE- EI1PHASIS5A-13.,uF2.7Klorrrrl36PlLeiEl4 LLjE : STGNAL$LTAGE NEcEssARy FoR oBTATNTNG 56vEo ourpur poyvEn ilK Hz)V : 0C V0LTAQE AT N0 TNPUT STGNALTzFll tBl ll lr lRED!l!rri1-2-3- 4- 5 6 l 89 r|-. on454RNS AND PARTS LISTP0vfER SUPPLY AS) AWR,- toOl431*i._-+o Gnn Tt gR,iqT 406lAPr00KEi,EAC lzovOU NL,.r*l8 * ;porvEn SUPPLY tr PRoTECTIoN ASsy AfR-099Qs,Or,0e QsQ5-g1,os 2SCl6+?xs 2sAt2illslts5 x4Or2SCn65t- #t.-n1 ,hJ sroJ-ffiiLt_Q.Qr25tX0 xei6- oPLe 0v 5onArx0R S o oPLr AhPl-s FmPLs PromPl-r AUX3V 38rApqlrt0NINOICATOREv $nA x+Ssl rti R.2K- r rr-rr.-*-*niEJffit nm-d.iIIlrtKttrurcrlqfi 0s, Os lSl88Fll xzgo,iins T:1l IE-.?-. - JA,Sh.Ds lSl0EO x+06,ss SR3Afl-Ex+44+3TP 2*$:,T:fr:r:,rl,19:l_gtgasrq:s?; s r o o lr_: _-_ J 33vE or-as2SC945 lRllR 8V 3&iAr3s F? $? -tztq- - - - - v | ) D r .D . C n io.2SC|3Cxz SIV4xz.:i_ - a_-_1 Ln .Rrrtx(Yzrt CtodoSEIJIICONDUCTORSSymbolDescriptionPart No,o1a2o3o4Tra nsisto rTra nsistorTransistorTra ns isto r25D 388-R25B 541-R25D 388.R2SB 541-Rsix-75cl12.2MISCELLANEOUS PARTS47CAPACITORSSymbolDescriptionPart No.c1c2UJc4Electrolytic 15,OO0 sOVElectrolytic 15,000 50VCeramic O.01 150V (DC1.4kV)Ceramic 0.Ol 150V (DC1.4kV)ACH-057ACH-057ACG-003ACG-001SWITCHESSymbolDescriptionPart No.S1Rotary switchASA.O39LAMPSSymbolDescriptionPart No.PLlPL2PL3PL4PL5PL6PL7PL8PL9Lamp assembly (BV, 0.34)Lamp assembly (8V, O.34)Lamp assembly (8V, 0.3A)Lamp with leads (8V, SOmA)Lamp with leads (8V, 50mA)Lamp with leads (8V, 5OmA)Lamp with leads (8V, 50mA)-amp with leads (8V, 50mA)Lamp with leads (BV, 50mA)AE L.O60AEL-O6OAE L-O6OAE L-