Pioneer-SX-440-Service-Manual电路原理图.pdf

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1、PIONEER o)/f SOLID STATE FM-AM STEREO RECEIVER sx-44(f-w 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. o Model SX-440 is set for240V operation when shipped. lf this unit is used in a differen

2、t line-voltage area, read and follow LINE VOLTAGE SELECTION AND FUSE on back cover. Be sure that the line voltage setting on your unit agrees with the line voltage in your area and that the fuse installed in your unit is a proper one. INSTALLATION, OPERATING AND SERVICE MANUAL lncluding PARTS LIST,

3、CIRCUIT DIAGRAMS, TROUBLE SHOOTING AND MOUNTING TEMPLATE, PIONI,ER ELEGTRENTtr CURPtrRilTIOil YtH $gltrIQ wrtL RadioFans.CN 收音机爱 好者资料库 PIONEE.R FEATURES OF SX-44O OSENSITIVE FM CIRCUIT A high performance transistor is used in RF amplifier for excellent sensitivity. No distortion or cross modulation

4、will be caused by high input power. OBUILT.IN MULTIPLEX CIRCUIT Provides full-frequency response and a good separation between channels for excellent stereo effect. OAUTOMATIC FM MULTIPLEX SIGNAL INDICATOR A lamp lights automatically when receiver is tuned to an FM station transmitting stereo multip

5、lex signals. O EASY-TO.READ TUNING INDICATOR The clear, easy-toread Meter permits quick station selection OLOUDNESS CONTOUR CIRCUIT Preserves musical balance and provides full dynamic range of reproduction, even at very low volume control settings. OINDEPENDENT TONE CONTROLS Separate bass and treble

6、 controls permit adjustment of tonal qualities to suit room acoustics and individual taste. OFULL COMPLEMENT OF INPUTS Stereo inputs are provided on the rear panel for record player with a magnetic, ceramic, or crystal cartridge; there are also inputs for a tape recorder or tape deck; plus auxiliary

7、 input for TV sound or other sound source. OTAPE RECORDING OUTPUT Permits making stereo or monaural tape recording of any program material (AM, FM, FM stereo multiplex, or record) while the material is being played. OSTEREO HEADPHONE JACK Permits private listening through a stereo headphone without

8、disturbing other people. Located on the front panel for easy access. O DUAL.CHANNEL HIGH-FIDELITY AUDIO POWER AMPLIFIER High-efficiency power transistors are employed in the pushpull complementary circuit for each audio amplifier channel for full fidelity frequency response. LINE VOLTAGE SELECTION A

9、ND FUSE Switching Line Voltage Setting and Fuse ln order to remove the fuse, turn the fuse cap located on the line voltage selector switch in the direction indicated by an arrow. Then remove the fuse plug from the unit. Put the fuse plug back so that the proper line voltage marking can be seen throu

10、gh the cut in the edge of the plug. Whenarer the set position of the selector switch is changed, check the rating of the fuse. A O.S-ampere fuse is to be used for either 22OV or 240V operation and a 1-ampere fuse for any of 1 lOV, 117V, or 130V operation. lf the rating of the fuse is proper, install

11、 the fuse in the fuse cap. .REPLACING OF FUSE When the fuse is blown, remove the fuse cap and the fuse with a new one. replace -T corN Fig. 1 FUSECAP Take off the fuse cap by turning it with a coin, in the direction indicated by the arrow. RadioFans.CN 收音机爱 好者资料库 PIONEE.R R MODEL SX.44O FMSTEREo MON

12、O l !Hlrr.c SPEAKER AFF B TAPE VOLUME MON LOUDNESS L _0_.R FM 88 s s? 91 90 98 100 l0? t04 106 108 MHz 55 60 70 80 S0 100 l?0 140 160 x loKHz 6 15 1617 g 1B 11 12 1g 28 29 30 3t32 33 I t3 2526 27 Fig.4 2B 21 22 23 24 Fig.5 PHONO. AUX ,. KNOBS AND SWITCHES ON FRONT PANEL 1. POWER SWITCH Power is turn

13、ed on when the sritch is rotated clockwise; turned off when rotated counterclockwise. Operation of this switch also turns on and off the power supplied to the AC OUTLET (3O) located on the rear panel of the SX440. 2. TUNING INDICATOR When tuninq the radio receiver to an FM or AM broadcast station, t

14、he TUNING KNOB (4) is adjusted so that the pointer of this meter may deflect to the maximum. 3. FM STEREO INDICATOR When the SX-2140 receivesan FM stereo program, this lamp lights. 4. TUNING KNOB An AM or FM broadcasting station is tuned in. While observing the pointer of the TUNING INDICATOR (2), s

15、et the knob for the best receiving condition, 5. SELECTOR SWITCH I The SX-440 is set for one of the following operations: AM . . Reception of AM broadcasts FM MONO Reception o monaural FM broadcasts FM STEREO Automatically selective reception of stereo or monaural FM broadcbsts . . . . Play of disk

16、record I . Connection of a record player having a crystal or ceramic pickup, cartridge tape player, or audio output of a TV receiver. 6. PHONES Cord plug of a stereo headphone is inserted here for enjoying stereo play without disturbing other people around. Loudspeakers stop emitting sound then. For

17、 the stereo headphone, PIONEERs Model SE-2P, SE-20, SE-30 or SE-50 is recommended. . When a lonqer cord is required for the stereo headphone, use PIONEERs Model JB-23 extension cord separately available. When desiring to connect two stereo headphones, use PIONEERs Model JB-22 Y cord separately avail

18、able. 7. LOUDSPEAKER ON/OFF SWITCH With this sruitch in the ON position, loudspeakers emit sound. When the snritch lever is set to OFF, loudspeakers stop sounding, lt is convenient for using a headphone, B. LOUDSPEAKER SELECTOR SWITCH When the s,itch is set to the A position, the loudspeakers connec

19、ted to the SPEAKER SYSTEM A TERMINALS on the rear panel of the SX-440 emit sound; when set to 8. those connected to the SPEAKER SYSTEM B TERMINALS. 9. BASS CONTROL As this knob is turned clockwise, bass is boosted, as turned counterclockwise, attenuated. The control is designed to give a flat charac

20、teristic curve when the knob is set to the middle sf the rotation range. oThis knob controls the tone quality of both right and left channels simu ltaneously. 10. TREBLE CONTROL Use of this treble control knob is similar to that of the BASS CONTROL KNOB (9) , 11. MODE SWITCH When playing a disk reco

21、rd or tape, or receiving a broadcast program, keep this snritch in the STEREO position. Set the saritch to MONO only when using a monaural record player or tape recorder, or reproducing a tape on which monaural recording is made, 12. TAPE MONITOR SWITCH For ordinary record play or radio reception, k

22、eep thissritch in the OFF position. Set the svvitch to ON only when playing back a tape by using a tape recorder (or tape deck) or monitoring the recording condition of such equipment. lf the switch is set to the ON position when conducting disk record play or radio reception, loudspeakers do not so

23、und. Be careful in this respect. 13. LOUDNESS CONTOUR SWITCH When the switch is set to the ON position while theSX-440 is operated at a low sound volume, both bass and treble are boosted for easy listening. When the equipment is operated at a high sound volume, it is recommended to keep the suritch

24、in the oFF position. 14. VOLUME CONTROL The loudspeaker sound volume increases when this knob is turned clockwise; it decreases when the knob is rotated counterclockwise, This double knob con- sists of two component knobs interlocked by friction. When the knob is turned, both component knobs rotate

25、together to control the sound volumes of right and left channels simultaneously, To adjust the volume of either right or left Fis.7 RIGHT CHANNEL channel alone, hold one of the component knobs by one hand and turn the other component knob by the other hand. lt is convenient for balancing the sound v

26、olumes of both channels. The front knob is for the left channel and the rear knob is for the right channel. - I ooat,o* l B ffi .or* / A:i;?- Vq I o o.,o* . nn (LEFT IRIGHT) mm Fis. 6 TERMINALS AND CONNECTION 15. FM ANTENNA TERMINALS An FM broadcast receiving antenna will be connected to these termi

27、nals, 16. GROUND TERMINAL 1 Connect a ground conductor to this terminal for grounding the SX- zl40 17. AM ANTENNA TERMINAL This terminal is provided for connecting an external AM broadcast receiving antenna. NOTE: For the most suitable FM antenna, AM antenna and grounding, refer to the article ANTEN

28、NA CON- NECTION AND GROUNDING. 18. AM FERRITE ANTENNA An AM broadcast receiving antenna accessory to the SX-440 When using the SX44O where the f ield intensity is high, recep- tion cah be conducted simply by adjusting the direction of this antenna without connecting an external antenna to the AM ANT

29、ENNA TERMINAL (17). 19. PROTECTIVE FUSES These fuses protect transistors in the SX-440 .When loudspeaker terminals are short-circuited, or the SELECTOR (5) on the front panel is operated while the SX-440 is used at a high sound volume, one or both of the fuses may blown to protect power transistors.

30、 When this occurs, replace the blown fuses with the accessory 2-ampere fuses. The right-hand side fuse is for the left channel; the left-hand side fuse is for the right channel. 20. MAGNETIC PHONO TERMINALS Connect here the output cords of a record player equipped with a magnetic cartridge. The uppe

31、r jack is for the left channel; the lower jack, for the right channel. When connecting a monaural record player, use either one of the iacks. 21. AUXILIARY TERMINALS These jacks are used when connecting the output cords of a record player equipped with a crystal or ceramic cartridge, or a cartridge

32、tape player. Also use these jacks for reproducing the audio output of a TV receiver. The upper jack is for the left channel; the lower jack, for the right channel. 22. GROUND TERMINAL 2 lf the record player or other equipment to be used with the SX-440 has a ground conductor, connect it to this term

33、inal. 23. TAPE MONITOR TERMINALS Connect to these jacks the playback output terminals (line output) or monitor terminals of the tape recorder (or tape deck) used with the SX-44O 24. TAPE RECORDING TERMINALS Connect to these jacks the recording input terminals (line input) of the tape recorder (or ta

34、pe deck). The signals outgoing from these terminals cannot be adiusted with the VOLUME (14), BASS (9) or TREBLE (1Ol controls. NOTE: For correct connection to the TAPE MONITOR (23) andTApE RECORDING l24l jacks, refer to the articte ,CONNECTION OF TAPE RECORDER ON REAR PANEL 25. LAPE _ BECORDTNG / PL

35、AYBACK CON_ NECTOR (DIN TYPE Provided that the tape recorder (or tape deck) to be used has a DIN-type tape recording/playback connector, connection for recording and playback (and monitor) can be completed simply by linking the tape recorder with the SX440 through the recording/playback cord that is

36、 separately available. When this connector is used, terminals (23) and l24l are not used, 26 if the record player has a crystal or ceramic cartridge, connect the output cords to the auxiliary terminals. lnsrt the output cord plug for the left channel into the upper terminal jack, and that for the ri

37、ght channel into the lower terminal jack. CONNECTION OF TAPE RECORDER . The tape recorder to be used with the SX-44O should have an output terminal (line output) for connection to external amplifier, or a tape monitor terminal. o When using a tape deck, the tape deck should have a recording/ playbac

38、k preamplifier built in. PIONEERs Model T-500F separately available can be used with the SX44O without any problems. TCONNECTION FOR RECORDING: Connect the recording input terminals (line input) of the tape recorder (or tape deck) to the TAPE RECORDING TERMINALS (24l. of the SX-440 . For this connec

39、tion, use the cords which are normally accessory to the tape recorder. The upper one of the recording input terminals (line input) is for the left channel; the lower one, for the right channel. When the tape recorder is monaural, connect its input terminal to the upper TAPE RECORDING TERMINAL (24l.

40、. CONNECTION OF CARTRIDGE IGROUNDING: o Groundingor non-grounding the GROUND TERMINAL 1 (16) does not much affect the performance of the SX-440. However, it is desirable to ground the terminal from the view- point of safety. . Connect to the GROUND TERMINAL 1 (16) the ground conductor leading to the

41、 earth. When using a monaural record player, connect its output cord to the upper (left channel) terminal. NOTE: lf the output cord plug of the record player to be connected does not fit the input terininal jack of the SX-2140 , replace the plug with the pin plug contained in the accessory bag, (OR

42、TAPE DECK) r CONNECTION FOR PLAYBACK (OR TAPE RECORDING MONITOR): Connect the playback output terminals (line output or tape monitor terminals) of the tape recorder (or tape deck) to the TAPE MONITOR TERMINALS (23). Tne connecting procedure is similar to that of the above CONNECTION FOR RE- CORDING.

43、 r USE OF TAPE REC/P.B. CONNECTOR: lf the tape recorder (or tape deck) to be connected to the SX440 has a recording/playback connector of DIN type, nnect it to the TAPE REC/P.B. CONNECTOR (25) of the SX-44O . Disregard CONNECTION FOR RECORDING and ,CONNECTION FOR PLAYBACK TAPE PLAYER When using the

44、cartridge tape player PIONEERs Model H-60E), connect its output to the AUXILIARY TERMINALS (21). The connecting procedure is similar to that for record player connec- tion, IPIONEER RECEPTION OF BROADCAST r BEFORE TURNING ON THE POWER SWITCH OF THE SX.44O, CHECK THE FOLLOWING: VOLUME CONTROL KNOB (1

45、4) is set to MtN. TAPE MONITOR SWITCH (12) issetto OFF. MODE SWITCH (11) set to STEREO. SPEAKER ON/OFF SWITCH (7) is set to ON. (lf using a stereo headphone, set the s/itch to OFF). r RECEPTION OF FM BROADCAST: 1, SEt thE SELECTOR KNOb (5) tO thE FM STEREO position. 2. While observing the pointer de

46、flection of the TUNING INDICATOR (2), tune the SX-440 to the desired station by using the TUNING knob (4) . The best reception isattained when the pointer of the TUNING INDICATOR (2) largely deflects rightward. lf the tuned station is broadcasting a stereo program, the STEREO INDICATOR (3) lights. W

47、ith the SE LECTOR knob (5) in this position, monaural programs can also be received. 3. When the desired station is tuned in, gently turn the VOLUME CONTROL knob (141 clockwise. Ad.iust the BASS CONTROL (9) and TREBLE CONTROL (10) for the desired tone quality. .When the SX-2140 is used very afar fro

48、m the broadcasting station, or external noise is intensive, the noise is sup- pressed and better reception is attained by setting the SELECTOR knob (5) to the FM MONO position. When the knob is in this position, however, stereo programs are received as monaural programs. (The stereo indicator is unr

49、elated although it lights.) 4. When good radio reception cannot be attained by the above operating procedures 1 to 3. reconsider the antenna, referring to the article ANTENNA CONNECTION AND GROUNDING. TRECEPTION OF AM BROADCAST: 1. Set the SELECTOR knob (5) to the AM position. 2. While observing the pointer deflection of the TUNING INDICATOR (2). tune the SX440 to the desired station by using the TUNING knob (4). The best reception is attained when the pointer of the TUNING INDICATOR (2) largely deflects rightward. 3. When the desired station is tuned in, adjust the VOLU