Pioneer-SX990-rec-sm维修电路原理图.pdf

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1、PIONEEFI v J SOLID STATE AM/FM STEREO RECEIVER Model s)Ges|o CAUTION Before connecting the line cord to the wall socket, carefully read and follow the instructions described below, to assure the safety of your unit. . This rsceiver is set for 24OV operation when shipped. lf this unit is usd in a dif

2、ferent linevoltage arsa, read and follow LINE VoLTAGE SELECTION AND FUSE on page 1. Be sure that the lin voltage sstting on your unit agrees with tho line voltags in your area and that the fuse installed in your unit is a proper one. INSTALLATION, OPERATING AND SERVICE MANUAL Including PARTS LIST, C

3、IRCUIT DIAGRAMS, TROUBLE SHOOTING AND MOUNTING TEMPLATE. (FVW) PIONEER ELf, CTRtrNIE EtrRPtrRATItril RadioFans.CN 收音机爱 好者资料库 IrJIONEEFI FEATURES HIGH.PERFORMANCE FM TUNER An FET field-effect transistor) is used in th radiofrequency amplifier to attain a high sensitivhy and selectivity. Funher, four

4、lcs (integrated circuits) are usd for th intermediate frequency amplifier to eliminate interference and noise. BUILT.IN EXCELLENT FM MPX CIRCUIT This srwitching cirdit having excllent separation and frequency response is built in for reproduction of rea lity music. BUILT-IN HIGHLY-SENSITIVE FERRITE

5、ANTENNA FOR RADIO RECEPTION The ferrite antenna provides high-sensitivity reception of AM broadcast programs. . SPECIAL CIRCUITRY FOR VERSATILITY The high output given by strictly selected transistors, two seG of loudspeakor terminals and phono terminals, and the provision for using a microphone mak

6、e Model SX-990 suitable for the professional use a well 6 the family use. A VARIETY OF ACCESSORIES Accessories include the program lamps that indicate the program being played, the tuning meters vertically arranged for facilitating selection of an FM broadcast program, the loudspeaker selector switc

7、t, tape monitor switch, etc., all for enjoyable use of Model sx-990. ELEGANTLY DESIGNED FRONT PANEL Narvly designed knob6 are uniquely arrangd on the silver tone panel. LINE VOLTAGE SELECTION AND FUS SWITCHING LINE VOLTAGE SETTING AND FUSE In order to remove the fuse, tum the fuse cap located on the

8、 line voltage selector switch in the direction indicated by an arJow. Then remove the fuse plug from the unit. Put the fuse plug back so that the proper line voltage marking can be seen through the cut in the edge of the plug. Whenever the set position of the selector s itch is changed, check the ra

9、ting of the fuse. A l-ampere fuse is to be used for either 220V or 24OV operation and 2-ampere fuse for any of 110V, 117V, or 130V operation. lf the rating of the fuse is proper, install the fuse in the fuse caD. REPLACING OF FUSE When the fuse is blown, remove the fuse cap and replace the fus with

10、a nevv one. Take off the fuse cap by turning it with a coin, etc. in the direction indicated by the arrow mark, AIII w v cott FUSE PLUG Fis. 1 RadioFans.CN 收音机爱 好者资料库 REAR CONNECTIONS TURNTABLE (MM) CARTRIDGE TAPE PLAYER CRYSTAL /CERAMIC TAPE RECORD PLAYER GND I TERMINAL RECORDING TAPE TAPE REC / P.

11、B. CONNECTOR (DIN TYPE) REC/P. S. TAPE MONITOR fo) ro)l TAPE E SPEAKER OUTPUT FTERMINALSl (4n-l6a) g CENTER CHANNEL 220V 2A t 3 0 v I tov I NOTE : tf the (DlNtype) is CONNECTOR , and MONITOR A-SPEAKER SYSTEMB-SPEAKER SYSTEM NOTE: l. Whn only on st of sPaker systm is connected to th Sx-99O. The spesk

12、r imPedance mav be 4 to 16 ohms. 2. Do not short the SPEAKER TERMINALS. ALL TERMINALS *9*O !T! LJJL4EF MAGNETIC ARE INTERNALLY PHONO I PHONO2 wrREo AS FOLLoWS: | ry q! ry x;l*;:i:11$ E E LINE VOLTAGI SELECTOR AI LEFT CHANNEL CHANNEL RIGHT CHANNEL RadioFans.CN 收音机爱 好者资料库 LINE CORD FM ANTENNA lI the i

13、ndoor antenna js not adequate for reception of FM Prog- rams. seParatly esta- blish an antenna in the outside ol th house for receiving FM sig als STEREO SYSTEM The SX-990 is a generafpurpce stereo amplifier. Connect to it the loudspeoker systems (two or four), turntablo, tape recorder, etc., which

14、are separately 6vailable. Fig. 3 INSTALLATION For installation of the stereo system, select a place rneeting the follo,ving: . Well ventilated. and free from moisture and dust . Unex posed to direct slnlight a Far from heat radiators (space heaters. etc) . Stable without incurring vibrations LISTENI

15、NG ROOM . When the stereo system is installed, listen to music according to the connection and operation in- structions descriH below. . The reproduced sound isvery diffurent depending on the size of the room, the furniture anangement in the room, and the materials of walls,floor and ceiling. Genera

16、lly, the reproducd sound fills the room if the room has a low ceiling and hard floor, or the room has a small length and a hard wall opposing loudspeakers. This undesirable acoustlg condition can be much alleviatd by laying a carpet on the floor for the former room and by covering the wall with a th

17、ick olrtain for the latter room. lt is also an effective solution to dlange the arrange ment of fumitur6 for irregular reflection of ttle loudspeaker sound. ecordlplayback connector rrovided on your tape APE REC / P,B. .erDinals to the rsceiver RECOROER) FM ANTENNA TERMINALS 230 VA (TAPE Fis.2 Radio

18、Fans.CN 收音机爱 好者资料库 IPIONEETT CONTROLS AND SWITCHES ON THE FRONT PANEL PROGRAM 3 rruotcnroR LAMPS t61514l3 l.SPEAKERS SWITCH A combination of the Dower on/off switch and th loudspeaker system selector switch. NNss K:w slf o,N N KK + sexn,s-orr_lr+e_:;1 ssGmffKr: Fig.4 POWER OFF:.The equipment is deen

19、ergized. The power supplied from the S1I/ITCHED AC outlet (36) is discon- tinued simultaneously. A: .-.-.-. Sound is reproduced from the loud- speaker system connected to the SPEAKER OUTPUT A terminals (31 and 321. SPKR OFF: . Loudspeakers stop sounding. This position is selected when using a stereo

20、 headphone. B: .-.-.The loudspeaker system connectd to the SPEAKER OUTPUT B terminals (33 and 34) is put in operation. A + B: . .-.The loudspeaker systems connected to SPEAKER OUTPUT A and B termi- nals are put in operation, FM _E6 e0 s2 s4 .g!jgj0g_-10:_I0j_!0j_!0!_.MHz ia-i6t-xrokrz SPEAKEFIS Fi$

21、5 RadioFans.CN 收音机爱 好者资料库 2. TUNING METERS When tuning the receiver to an AM broadc6tirE station, adjust the TUNING knob (4) so the pointer of the lower one of the meters deflects largely rightward. When tuning the receiver to an FM broadcasting station, adiust the TUNING knob so the pointer of the

22、lower meter deflects largely rightward and, in addition, the pointer of the upper meter is at the center, Tuning to AM Rdio Station Fis.6 3. FM STEREO INDICATOR This lamp is lit during reception of an FM stereo program. 4. TUNING KNOB The knob for tuning the receiver to an AM or FM broadcasting stti

23、on. Adiust the knob for the best tuning while obsrving the tuning meters (2). 5. SELECTOR SWITCH The s,witch for selecting the program source. AM: . . For reception of an AM program. FM MONO: .,. For recption of an FM monaural program, FM AUTO: . For automatically selectiv reception of stereo or mon

24、aural FM Program. PHONO 1. For playing a disk record by using the turnbble connected to the PHONO 1 terminals (17), PHONO 2/MlC: For playing a disk record by using the turntable connected to the PHONO 2 terminals (18) or for using a micp phone by inserting its cord plug into the MIC iack (16). (When

25、 the micro phone is connected to the iack, the turntable connected to the PHONO 2 terminals cannot be used.) AUX: .-. For using the cartridge tape player, reproducing the TV audio output, or operating other equipment connectd to the AUX terminals (20). When the SELECTOR sl,vitch is operated. the pro

26、gram indicator lamp corresponding to the select- ed source ligh. 6. PHONES JACK When using a stereo headphone, insert its plug into this iack. For the headphone to be used with Model SX-990, PIONEERs Model SE-20, SE-30 or SE-50 is recommended. When a longer cord is required for the stereo headphone.

27、 use PIONEERs Model JB-23 extension cord separately available. When desiring to connect two stereo headphonet use PIONEERs Model JB-22 Y cord separately available. BASS CONTROL When this knob is turned clockwise, bass is boosted; when tumed counterclockwise. attenuated. Whh the knob set to the cente

28、r, the frequency response curve is flat. The center and outer knob6 of this double knob are friction-coupled with each other. and the tone of both left and right channels can be adjusted simultaneously by tuming either knob. The center knob is for the left channel. and the outer knob is for the righ

29、t channel. When adjusting the tone of onlv one of the channels, turn the knob for that channel while holding the other knob by the other hand. RIGHT CHANNEL (cH .R) Tuning to FM Radio Station tw-t* 7. LEFT CHANNEL (cH .L) Fis.7 RadioFans.CN 收音机爱 好者资料库 OI v 8. TREBLE CONTROL Use of this knob is simil

30、ar to that of the BASS control knob (7). 9, FILTER SWITCHES LOW: A svtitch for suppressing low-frequency noise or hum. HIGH: A su?itch for zuppressing high-frequency noise. These s,witches are of the pushbutton type. When the button is pressed once, the switch tums on. and when pressed once again, i

31、t turns off, 10. BALANCE CONTROL This knob is used for adjusting the stereophonic balance. When the volume of the right channel loudspeaker is smaller, turn the knob clockwise toward RIGHT; when left channel volume is smaller, counterclockwise toward LEFT BALANCE whn the volume *.)jlt- when the volu

32、me o teft channet f N right chsnnel toudspeak6r it lk-+:) loudsPeaker is smattr VrZ smaller LEFT- FTIGHT Fig.8 11. VOLUME CONTROL The volume increases when the knob is turned clockwise, 12, 13 and 14 are pushbutton switches. Switches turn on when the pushbuttons are depressed once; turn off when dep

33、ressed again. 12. LOUDNESS SWITCH With this switch turned on when the sound volume is low, insufficiencies of bass and treble are com- pensatd for. When the sound volume is high, it is recommendd to keep this s,witch turned off. 13. MUTING SWITCH Turning on this switch, the noise generated when tuni

34、ng the receiver to an FM station can be eliminated. lf l4odel SX-990 is used where the FM field strength is low, keep this str/itch turned off since the program sound is also suppressed with the switch tumed dn. 14. TAPE MONITOR SWITCH Turn on this switch for listening to or monitoring only the sign

35、al reproducd by a tape deck (or tape recorder). When not using the tape deck (or tape recorder). keep this switch turned off. Otherwise, loudsoeaken will not sound. 15. MODE SWITCH Functions as follows: REV. Stereo, with lefi and right channel input signals exchanged for each other. STEREO . Normal

36、stereo L.- Monaural play with only the left channel input signal fed to both channel loudsDeakers. R. Monaural play with only the right channel input signal fed to both channel loudsPeakers. L + R . Monaural play with both leftand right channel input signals mixed together and reoroduced from both c

37、hannel lou-_ - LEFrv -t- rlr-r -.t I D U T I I I O U T P U T L-RGHro I L.-.- r .-;-_-l -LEFro-t- !LE;r-.1 t:1., -+-t-F ,.?i- . Fis.9 16. MIC MICROPHONE JACK When a microphone is connecGd to this iack, the signal fed from the turntable connected to the PHONO 2 terminals (18) on the rear panel is d is

38、con nected, RadioFans.CN 收音机爱 好者资料库 ITJTONEEII TERMINALS AND CONNECTORS ON THE REAR PANEL: 17 18 t9 20 2122 232526 27 35 36 3728 29 30 31 32 33 34 The upper ones of the terminals 17, jA,20,21,22, 28 and 29 are for the left channel respectively; the lower onet for the right channel. 17. PHONO 1 TERMI

39、NALS MAG: .,. Connect here a turntable equipped with a moving magent cartridge. CER: .,.,. Connect here a turntable equipped with a ceramic or crystal cartridge. NOTE: Two turntable cannot be connected to the MAG and CER terminals simultaneously. 18. PHONO 2 MAG TERMINALS Connect here a turntable eq

40、uipped with a moving magnet cartridge. 3B Fis. 10 19. GND (GROUND) TERMINAL 1 lf the turntable or other equipment used with /odel SX-990 is provided with a ground wire, connect the wire to this terminal. 20. AUX. (AUXILIARY) INPUT TERMINALS Connect here the output of a cartridge tape player. 21. TAP

41、E MON TERMINALS (TAPE PLAY. BACK INPUTS) Connect the iine output or monitor output of tape deck (or tape recorder) to these termanals. 22. T APE REC TERMINALS (TAPE RECORD- ING OUTPUTS) Connect the line input of a tape deck (or tape recorder). Signal is always supplied to these termi- nals while SX-

42、990 is working; however, the signal RadioFans.CN 收音机爱 好者资料库 OI w cannot be controlled with the VOLUME (11), BALANCE (10), TREBLE (8) or BASS (7) control on the fmnt Danel. 23. TAPE RECiPB CONNECTOR (DI N TYPE) lf the tape deck (or tape recorder) to be used with Modet SX-990 is provided with a record

43、/playback connector of the DIN type, the tape deck (or tape recorder) can be connected to Model SX-990 for both recording and playback (and monitor) by simply connecting the DIN cable. When this cable is used, connections to terminals (21t. and l22l are unnecessary. The detail of connection is shown

44、 on page lO. Connection of tape deck (or tape recorder),. 24. AM FERRITE ANTENNA Where the field strength is high, adjust the direction of this ferrite antenna for good reception, without using an external antenna. lf good reception cannot be obtained, see page g. Antenna Cmnection and Grounding. 25

45、, AM ANTENNA INPUT TERMINAL Connect a lead wire or outdoor AM antenna to this terminal if the ferrite antenna (24) cannot get good reception. 26. GND GROUND) TERMTNAL 2 Connect a ground wire to this terminal. 27. FM ANTENNA INPUT TERMINALS Connect an FM antenna to these terminals. NOTE: For the deta

46、ils of AM antenna, FM antenna and grounding, see Antenna connection and grounding on page g, 28. PRE-AMP OUTPUT TERMINALS The outpr.rt of preamplifier stage, which is the signal having passed the tone control circuit is always supplied to these terminals. 29. MAIN-AMP INPUT TERMINALS These are input

47、 termirEls of the power amplifier stage of Model SX-990. The PRE-AMP OUTPUT (28) and MAIN-AMP INPUT (291 terminals are connected to each other with the iumper plugs. With these plugs removed, the preamplifier and power amplifier stage of Model SX-990 can be used apart. This system is conveniert for

48、compocing s multi.amplitier systsm and other purposes. 30. CENTER CHANNEL OUTPUT TERMI- NAL The signals of left and right channels are mixed together and supplied to this terminal at all times. The terminal may be used for composing a 3-D rystem or connecting a center-channel amplifier. 31. the righ

49、t channel to terminal (31) and the left channel to terminal (32). 33. if equipped with a ceramic cartridge, to the CER terminals of PHONO 1t17t. Connect the left channel output cords of the turntable to the uF -inal, and the right channel outputcord,- tne lower terminal, When using a monaural turntable, its output cord may be connected to either upper or lower ter