Pioneer-SX1000TD-rec-sm 维修电路原理图.pdf

PIONE.E.RSolid state AM/FM STEREO RECEIVERM.DELSX-1 OCICITEICAUTI0N Before connecting the line cord to the wall socket, carefully readand follow the instructions shown below, to assure the safety ofyour unit.OModel SX-1000TDO is set lo 24OY operation when shipped.lf this unit is used in a different line-voltage area, read andfollow LINE VOLTAGE SELECTION AND FUSE on page 1.Be sure that the line voltage setting on your unit agrees withthe line voltage in your area and that the fuse installed inyour unit is a proper one.OPERATING INSTRUCTIONSPItrNEE,R f,.Lf.GTRONItr EORPORATIONRadioFans.CN 收音机爱 好者资料库IPIONEERSOME UNIQUE FEATURES:aFM front - end employing a field effecttransistor to hear more stations more clearlyolntegrated circuit (lC) employed in FM tunerassures outstanding capture ratio with highreliability.oMultiplex circuitry (MPX) for maximumchannel separationoUnique muting circuit permits the easiesttuning controloHigh performance single ended push-pull(SEPP) output stage eliminates audiotransformers and provides large output withtrue frequency fidelityOFull complement of inputs and outputsoElectronic switch fully protectsprecious power transistorstheBy the use of FET (field effect transistor) in the FM radio frequency amplifierstage, design of nearly perfect FlVl front-end was achieved-free from crossmodulation, free from drift, with better sensitivity, lower inherent noise, andhigh spurious rejection ratio.ln the FM intermediate frequency amplifier stage, integrated circuits are employed,resulting in an entirely different outstanding performance from that of lFstageshitherto designed, especially in the limiter characteristic and the capture ratio.The accurate electronic switching circuitry is employed in the FM multiplexdemodulator, insuring maximum separation with excellent tonal quality.The muting circuit provided in the FlVl tuner completely eliminates the FMinter station noise whrch has hitherto been annoying the user in tuning.The power amplif ier employs the high-performance single ended push- pullcircuitry in the output stage and the push,pull complementary circuitry in thedriver stage, completely eliminating the distortion rnherent transformers fromthe audio stage. Tripple diffused mesa transistors are adopted as the powertransistors in the output stage for full-fidelity frequency response with largeaudio output power and least harmonic distortion.The inputs and outputs pr,ovided in the receiver include two pairs of pHONOMAG inputs. When two turntables are connected to these inputs, the useris able to switch from one turntable to the other any time at will. Also, twopairs of ioudspeaker outputs are included for switching between, or for per-mitting the simultaneous use of, two loudspeakers.The electronic switchrng circuitry employed in the power supply completely protectsexpensive power transistors even when the loudspeaker leads are shorted whilethe receiver un,L is in useINSTALLATIONAs this receiver is sully transistorized, desirable places to installit are as follows:OPlaces airy and free from humidity and dust. Avoid insta lingon close, low-ceiling shelves.OPlaces not directly exposed to the sun ray.OPlaces not close to heat-emitting objects such as heaters andstoves.LINE VOLTAGE SELECTION AND FUSESwitching Line Voltage Setting and FuseIn order to remove the fuse, turn the fuse cap located on theline voltage selector switch in the direction indicated by an arrow.Then remove the fuse plug from the unit. Put the fuse plugback so that the proper line voltage marktng can be seen thruthe cut on the edge of the plug.Whenever the set position of the selector swttch is changed,check the rating of the fuse. A 1.5-ampere fuse is to be usedfor either 220l or 24OV operation and a 3-ampere fuse forany of 110V, 117V, or 130V operation. lf the rating of thefuse is proper, install the fuse on ihe fuse cap.OPlaces where there is as little vibration as possible and wherethe surface is level.The optimum stereophonic listening position is across the roomfrom the speakers, sornewhere close to the midpoini betweenthe right and leit speaker systems.Fig. 1OReplacing of FuseWhen the fuse is blown off, remove the fuse cap and replacethe fuse with a new one.wTvyZ FUSE cAP FUsE rusF PLUG socKETa*e off the luse caD by lurning rr wirh acoin, etc. in th dneclion indicared hy theRadioFans.CN 收音机爱 好者资料库TPIONEESELEOTORFM AIJTO:!:zr.lFM N4oNo/ I e.b/3+loFifiiEEtrlsg 1t D STATE Sr ERES R ECETVE R vonrr sx - r &oiFM ll 88 92 96 1oo 1o4 1oB MHzililrrrrllrrrItil$ailtilrtililtrrllililtlllilIa liltlIuIrilrIrailtrnr-ilrrilrAM ll 55 60 70 B0100 12O 140 160 xro KHz rUt,rrrrrcINDICATORFIU STERESPEAKERS BASVOLUME Low HtcH VODE fnpr H,1ONFILTER FILTER STEREO. ,STEREOLXIRA FRONTN,4AIN .L vn|n.FXTFA LrREAR gq6N1 qE4q-RT LT a RTLOUDNESS MUTTNG.AFC PHONO:,:rs,POWER K I SPOFFOFFt,IPHONESNllN YN/AX VtIYVAX rErT N/INYMAX10 11 1213141516Fig. 2Fig. 326 27 28 29 303435 3637 38 39f E,i irg*NS:6.NFunctions of the front pane! controls and indicatorsboost, and turnrng rt counterclockwise will reduce treble response.The center top indicates the intermediate point.Note: These controls (BASS and TREBL E) are of two sectiontype;the front section adlusts thesection adjusts the right channelis adjusted for both channelsthe response for only onechannel. the section corre-sponding to the channel maybe adlusted while the otheris held by hand.left channel and the rearUsaully, the tone responsesimultaneously. To adjustFie. 41. LOUDSPEAKERSThis switch selects the loudspeaker system to be used and alsoserves as the main power switch. lts positions are as follows:POWER OFF.For turning the unit power off.Fig. 5the volume level of the left and10. v0LuMEThis control adjusts the volume level. Turning it clockwise willincrease the volume, and turning it counterclockwise willdecrease the volume.11. LOUDNESS CONTOURFor listening at low volume settings, this switch is set to theL0UDNESS position to increase the sounds in the extreme bassand treble range for adding reality to the reproduction. For listen-ing at high volume level, this switch is normally set to OFF.12. LOW FILTERSetting this switch to the LOW FILTER position will eliminatelow f requency noise such as record rumble, hum, or otherinterference. When noise rs not present, this switch is normallyset to OFF.13. HIGH FILTERSetting this switch to the HIGH FILTER position wili eliminatehigh frequency noise, such as record scratch, hiss, static noisefrom fluorescent lamps, or other interference. When no suchnorse is present, this switch is normaily set to OFF.14. MUTING SWTTCHWhen an FIV station is tuned in, setting this switch to IVIUTINGwill eliminate interference noises between FM stations. For receptron of a weak-signal station, the switch should be set toOFF,15. AFC SWITCHThe function of the AFC (automatic frequency control) circuitis to compensate automatically for tuning drift which frequentlyoccurs when listening in an FM station for a long ttme. Thisswitch should be set to the OFF position when tunrng in astatron, and afier the station has been tuned in, t should immediately be set to the AFC positton.16. PHONO SWITCHThis control switch selects the record player to be used.PHON0 l .For reprodution of the output of the recordplayer connected to the PH0NO i jacks (26).PH0N0 2 .For reproduction of the output ot the recordplayer connected to the PHON0 2 jacks (27).S. BA!-ANCEThis control serves to balanceright channels.MArN .EXTRA .For listening through main loudspeakers.For listening through extra loudspeakers.NIAlN-EXTRA .For listening through both main and extraloudspeakers.SP. 0FF.For muting all loudspeakers. (This f unctionis convenient when the headphones are used.)2. FM STEREO INDICATORThis indicator light autornatically switches on when the FMstation is broadcastrns stereo.3. TUNING INDICATORThis meter indicates the optimum tuning points for AM or FN4stations. For tuning in a station, the TUNING control (4) isadjusted to produce maximum swing of this meter.4. TUNINGThis control tunes the receiver to the desired AM or FMstation.5. SELECTORThis control switch selects the program material to be repro-duced; the iype of radio broadcast, phonc, or tape playback.Alvl .-.For reception of AM (medium-wave broadcastband) station.Flvl lvlONO.For reception of FM monaural stations.Fl1 AUTO.For reception of FM broadcasts, with auto-maiic switching between FM monaural andstereo.PH0NO .For playback of records.79/l I I t .This position provides prooer equalization fortapes recorded at 19 centimelers br 7r/zinches) per second.9.5/33/a .This position provides proper equalization fortapes recorded at 9.5 centrmeters (or 33/qinches) per second.AUX.For reproduction of signals fed to the AUX6. PHONESThis jack is for7. BASSjacks (30)stereo headphonesThis control adjusts bass response. Turning it to clockwise willboost, and turning it counterclockwise will reduce bass response.The center top indicates the intermediate point.8. TREBLEThis control ad.lusts trebLe response. Turn ng t clockwise will17. MODE/TAPE MON. SWITCHThis switch is the selector for stereo/mono and tape monitorsettings. lts positions are as follows:aN40DE positions (for playback of records or reception ofbroadcasts)STERE0.For reproduction of stereo program.LEFT .For reproduction through both left and rightchannel loudspeakers of program materialbeing fed to any of left channel inputs.R1GHT.For reproduction through both left and rightchannel loudspeakers of program material being fed to any of right chaniel inputs.aTAPE MON positions (for playback of tapes or for monitoringof tape being recorded).STEREO.For stereo reproduction or stereo monitoringof recorded tapes.1EFT.For mono reproduction of only left channelof recorded tape.R|GHT.For mono reproduction of only right channelof recorded tape.Functions of the rear panelcontrols terminals and inputs.18. AM FERRITE LOOPSTIGK ANTENNAThis is a loopsiick antenna for the reception of AM stations.ln areas relatively close to the AM station, this antenna willprovide satisfactory reception. This antenna has directional proper.ties, so rt should be moved about while listening to a stationand set at the position providing the best reception.19. SEPARATION GONTROIThis control adjusts the channel separation of FM multiplexstereo broadcasts. lt has already been adjusted at the factory,and normally there should be no need for any further adjust_ment.20. AC OUTLETThis is an AC outlet that provides a convenient source of powerfor any associated equipment. lt has a maximum capacity of115VA.21. AC oUTLETThis is another AC outlet and has a maximum capacity of 230VA. This outlet is not controlled through the SpEAKERSswitch (1) and remains Iive at all times.22. AM ANTENNA TERMINATThis is the terminal for connection with the AM antenna (medi_umwave broadcasts).23. GND 1When using a ground lead for the receiver, it should be con_nected to this terminal.24. FM ANTENNA TERMINATSThese are the terminals for connection with the FM antenna.25- TAPE HDWhen driving program material signals direcfly from the headsof a tape player, the output cables should be connected to theseinput jacks.26. PH0N0 I27. PH0N0 2When using two turntables which are equipped with a magneticcartridge, the output cables of the second turntable should beconnected to these input jacks.28. GND 2lf a turntable equipped with a ground lead is used, the groundlead should also be connected to this terminal.29. PHONO CERWhen using a turntable which is equipped with a ceramic orcrystal cartridge, the output cables should be connected to theseinput jacks.30. AUXThese are input jacks for auxiliary inputs such as the audiosignal from a TV set.31. TAPE MONThe outputs of the LINE 0UTpUTS (the monitor output or play-back output) of the tape recorder should be connected to theseinput jacks.32. TAPE REGThe LINE INPUTS (the inputs or AUX inputs for recording) ofthe tape recorder should be connected to these recording outputjack s.33. Tape REC/P.B. C0NNECT0R (DtN type)lf your tape recorder is provided wrth the DIN_type record/play.back connector and also you have a connecting cord with DIN-type connectors, the tape recorder can be connected with thisunit for both recording and playback by simply connecting thecord between the recorder and this unit.34. LINE VOLTAGE SELTCTOR AND FUSEThe line voltage selector and fuse are assembled into one unit.For instruction on change of line-voltage setting or on fusereplacement, see LtNE VOLTAGE SELECTION AND FUSE,onpage 1.35. IINE GORDThis is the AC power cord. The AC plug provided at one endof this cord is inserted into the ad.lacent wall socket.36. MAIN LOUDSPEAKER TERMINALS (RIGHT CHANNEL)The right channel main loudspeaker leads are connected tothese terminals.37. MAIN LOUDSPEAKER TERMINATS (LEFT CHANNEL)The left channel main loudspeaker leads are connected to theseterminals.38. EXTRA IOUDSPEAKER TERMIIALS(RTGHT CHANIEt)The right channel extra loudspeaker leads are connected tothese terminals.39. EXTRA LOUDSPEAKER TERMIIALS(LEFT CHANlEL)The left channel extra loudspeaker leads are connected tothese terminals.When using a turntable that is equipped with a magnetic cartridge,the output cables should be connected to these input jacks.IPIONEEAntennaand Ground ConnectionsAM antennaOThe ferrite loopstick antenna (181 mounted on the rear of thereceiver will provide satisfactory reception of local stationswith strong signals. Because the loopstick antenna has directive properties, its direction may be adjusted for the bestreception while listening to a statron.Fig. 6Olf noise is strong in your area and the adjustment of theloopstick antenna direction does not improve the situation, thefurnished AM lead antenna may be laid on the wall or onother standing object as high as possible, and one end of theantenna lead should be connected to the AM antenna terminal(22). lf ihe furnished antenna dose not help, an outdoor AMantenna may need to be set up. In this case, the antennalead should also be connected to the Alvl antenna terminal(22)FM AntennaOlf the receiver is situated in regions close to the transmittingsite or is placed in a wooden building, the furnished simpleindoor T-shaped antenna will provide satisfactory results. lnthis case, the 2 wires of the twin leads from the antennashould be connected to the Fl1 antenna terminals (24) andthe horizontal element of the T-section should be extendedand positioned for the best reception while listening to an FMstation. Then, the antenna should be secured to the wall orto any support.Oln regions where the furnished indoorT-shaped antenna providespoor results such as many noises or poor channel separation,an outdoor FM antenna may be required. ln this case, the leadsfrom the outdoor antenna should also be connected to theFM antenna terminals (24).For information about the outdoor FM antenna, consuit aTV shop in your area.OG rou ndln some area, the use of a proper ground reduces noise sig-nificantly. The lead from an app