Pioneer-SX-3900-Service-Manual (1)电路原理图.pdf

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1、$eftice nual FM Iuartz Locked STEREO RECEIVER six-3s|oo ()proNEER RadioFans.CN 收音机爱 好者资料库 MODEL SX.3gOO COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS: Type Voltage Remarks KU 120V onlyU.S.A. model 5 / UI 10V, 120V, 22O and 240V (Switchable) U.S. Military model This service manual is applicable to t

2、he KU type. When repairing the S/G type, please see the additional service manual (see pages 47 -56l. CONTENTS 1. SPECIFICATIONS 1. spECtFtcATtoNS 2 Power Amplifier Section 2 FRoNr PANEL FACILTTIES a Continuous Power 0utput 0f 120 wattsxper chan- 3 BLocK DIAGRAM 7 nel, min., at 8ohms from 20Hertz to

3、 20,000 4. clRCUlr DESCRIPTIoNS Hertz with n0 m.re than 0.005% tolal harmo- 4.1 FM Tuner Section 8 niC diStOftiOn. 4.2 AM Tuner Section 9 To,rl Harmonic Distortion (20 Hertz to 20,000 Hertz, 4.3 Audio Section 9 g ohms) 4 . 4 D i s p l a y C i r c u i t s . . . . . . . 1 1 c o n t i n u o u s r a t e

4、 d p o w e r o u t p u t . . N o m o r e t h a n 0 . 0 0 5 % 4.5 Protection Circuit 13 60 watts per channel power 46 Surge current suppressor l5 ,1r,jlltr,r.ion oirioriion iuo rrrrrltrl;f ;:ltjT:fl 1 E 5 DISASSEMBLY 15 continuous rated power output . . No more than 0.005% 6. PARTS LOCATION 16 60 wat

5、ts per channel power 7. DIAL CORD STRINGING . 18 output . . . No more than 0.005% g. ADJUSTMENTS Frequency Response 8.1 Audio Section 1e rnpr.s.nriiiui,vli,.np.oun.t,i;ff T iorTln?,t.2 *! aa 8.2 Tuner Section. 20 . . . . . l V/50 kilohms 9, SCHEMATIC DIAGRAM 24 OUtPUt 10. p.c. BoARDS coNNECTToN DTAG

6、RAM 29 -speaker A B A+B Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms) I 1 . P A R T S L I S T . 3 5 . . . 6 0 12. EXpLoDED vtEW 41 Hr.; rtr.ir. iiHi, rrrortcircuiteo, A network) 1 3 . P A C K | N G . . . . 4 6 1 1 5 d 8 ADDTTTONAL SERVTCE MANUAL FOR S/G TYPE 41 Preamplifier Section I nput (Sensi

7、tivity/lmpedance) PHONO 1,2. . . 2.5mV/50 kilohms AUX, TAPE PLAY 1, 2, A D A P T O R I N . . . . . . 1 5 0 m V / 5 0 k i l o h m s Phono Overload Level (T.H.D. 0.005%, 1,000 Hertz) P H O N O 1 . 2 . . . 3 0 0 m V OutPut ( Level/l mPedance) TAPE REC 1, 2. ADAPTOR OUT 150mV PREAMP OUT (RL: 50 kilohms)

8、 . . . . 1Vl1 kilohms (Volume: max.) Total Harmonic Distortion (20 Hertz to 20.000 Hertz) PHONO 1.2 (REC OUT) . . . . . . No more than 0.005% (10V output) RadioFans.CN 收音机爱 好者资料库 sx-3900 AUX, TAPE PLAY 1, 2. ADAPTOR IN No more than 0.005% (10V output) Frequency Response PHONO (R IAA Equalization) .

9、. . 20 Hertz to 20,000 Hertz t0.2dB AUX, TAPE PLAY 1,2, ADAPTOR OUT Ton. contror 7 Hertz to 80 000 Hertz +9 dB BASS . !4dB/!7dB (100H2) f u rnover F requency : 2OOHz/ 400H2 TREBLE +gdB/t7dB (10kHz) Tu rnover Frequencv : 2kHz I 4kz Filter LOW. . 15Hz (-6dB/oct.) HIGH . 8kHz (-6dB/oct.) Loudness Conto

10、ur (Volume control set at -40dB position) . . . . +6dB (100H2), +3dB (10 000H2) Hum and Noise (lH F, short-circuited, A network) P H O N O . . . . . . 8 6 d B AUX,TAPE PLAY 1,2, AM Tuner Section Sensitivity (lH F, Ferrite antenna) . . (lHF, Ext. antenna) . Selectivity Signal-to-Noise Ratio lmage Res

11、ponse Ratio lF Response Ratio. . Antenna Audio Section Output ( Level/l mpedance) FM (100% Mod.). AM (30% Mod.) . Semiconductors l C s . . . F E T s . Tra nsistors Diodes M iscellaneous Power Requirements Power Consumption Dimensions Weight (without package) Furnished Parts Operating instructions FM

12、 T-type antenna 300sV/m 1 SpV 30dB 50d B 40dB 40dB Ferrite loopstick a ntenna A D A P T O R I N . . . Attenuator. FM Tuner Section Usable Sensitivity (lH F ) 50dB Ouieting Sensitivity MONO STEREO Signal-to-Noise Ratio MONO STE R EO Distortion (at 65dBf ) MONO 100H2. lkHz . 6kHz STEREO 100H2. ikHz .

13、1 05dB -20d8 9.8dBf (1.7pV) 14.2dBf (2.8pV) 36dBf (34.7pV) 83dB (at 65dBf) 78dB (at 80dBf) 0.1o/o o.o7% oJ% O.27o o.15% O.2To 650mV/2.4 kilohms 20OmV /2.4 kilohms t 5 o 89 62 AC 120V.60H2 350W (UL) 526(W) x 176(H) x 452(D) mm 20-11/16(wl x6-1 5/16 (H) x 17-14/16(Dl in 2Okg (441b 2ozl 1 1 * Measured

14、pursuant to the Federal Trade Commissions Trade Regulation rule on Power Output Claims for Amplifiers. NOTE: Specifications and the design subject to possible modifications without notice due to improvements. 6kHz Capture Ratio. . 1.0d8 Alternate Channel Selectivity 4 0 0 k H z . . . . . . 8 0 d B S

15、tereo Separation 1 k H z . . . . . . . 5 0 d 8 3 O H z t o 1 5 k l l z . . . . . . . 3 5 d B Frequency Response . . . . 2 O H z t o 1 5 k H z 1 ! j a a Spurious Response Ratio . . . . . . . 100dB l m a g e R e s p o n s e R a t i o . . . 9 0 d B l F R e s p o n s e R a t i o . . . . . . 1 0 0 d 8 A

16、M S u p p r e s s i o n R a t i o . . . 6 0 d B SubcarrierProduct Ratio . . . . . . . 64dB S C A R e j e c t i o n R a t i o . . . . 6 4 d B Muting Threshold 19.2dBf (SgV) Antenna Input . 300 ohms balanced, 75 ohms unbalanced. 2.FRONT PANEL FACILITIES O POWER SWITCH SetthisswitchtooNtosupp|ypowertot

17、hereceiver. There will be a short delay when it is set to ON because the muting circuit has been actuated to suppress the unpleasant noise that is sometimes generated when the Power is switched on and off BASS TURNOVER SWITCH Use this switch to change over the frequency in which the sound adlustment

18、 with the bass control is starting to take effect. Select 200H2 or 400H2 in accordance withthecharacterlsticsofyourIisteningroomandof your speakers, and with your general preference EASS AND TREBLE CONTROLS Use these controls to adiust the bass and the treble lf you set the tone switch to ON and tur

19、n the bass controItotherightfromitscenterposition,youwi|be ab|etoemphasizethesoundinafrequencyrangewhich is lower than that selected by the bass turnover switch Conversely, turning this control from the center position to the left will attenuate the sound You can use the treble control to adjust the

20、 sound in a frequency higher than that selected by the treble turn- over switch. TONE SWITCH Set this switch to ON when adjusting the bass and treble controls. When set to the OFF position the tone control circuitsaredisengagedandfrequencyresponseisf|at. Thisfunctionisconvenientforcheckingphonocartr

21、idge and speaker tone quality and listening room acoustics O TREBLE TURNOVER SWITCH Use this switch to change over the frequency in which the sound adjustment with the treble control is starting to take effect Select 2kz or 4kHz in accordance w i t h t h e c h a r a c t e r i s t i c s o f y o u r I

22、 i s t e n i n g r o o m a n d o f your speakers, and with your general preference noRProR swlrcH SetthisswitchtooNwhenreproducingsoundfroman optional component which is connected to the ADAP- TOR iacks. Always set it to the upper position if you are not using a component with these terminals TAPE D

23、UPLICATE SWITCH Set this switch to ON when you want to duplicate or edit a pre-recorded tape using two tape decks TAPE MONITOR SWITCH Employ for tape playback or to monitor a recording in progress. 1: Playback or monitoring of a tape deck con- nected to the TAPE 1 jacks SOURCE: Be sure to set to thi

24、s position when not using the tape deck for playback and moni- tori ng 2: Playback or monitoring of a tape deck con- nected to the TAPE 2 jacks NOTE: When listening to records or broadcasts be sure to set this switch to SOURCE Sound witt not be obtained from speakers if it is set to 1 or 2. ) BALANC

25、E CONTROL Use this control to balance the volume of the left and right channels. First, however, set the mode switch to MONO. lf the sound appears to be louder on the right, it means that the volume of the right channel is higher. Turn the balance control to the left and adjust. Con- versely, if the

26、 sound appears to be louder on the left, it means that the volume of the left channel is higher. Therefore. turn the balance control to the right and ad just. After adjusting, return the mode switch to STEREO. MODE SWTTCH Use this switch for selecting mono or stereo perform- a nces . STEREO: Set to

27、this position for normal operations. MONO: When set to this position, the left and right channel signals will be mixed and repro- duced monophonically from both speaker systems. o voLUME CONTROL Use this control to adjust the output level to the speakers and headphones. Turn it clockwlse to increase

28、 the output level. No sound will be heard if you set it to -. The scale is graduated in dB which indicate the attenuation when the maximum output level is 0dB. ) MUTING SWITCH Set this switch to the *20d8 position to attenuate the audio output indicated by the volume control by 20dB. There is no nee

29、d to adjust the volume control if you use this switch when turning down the audio output tem- porarily and when changing over records or tapes. G) HEADPHONE JACK Plug the headphones into this jack when you want to listen through your stereo headphones. Release both speaker switches if you want to li

30、sten to the sound through your headphones only. (E SPEAKER SWITCHES Depress the switch corresponding to the speakers con- nected to the SPEAKERS terminals (A or B) on the rear panel. You can depress both of these buttons to listen to the sound from two pairs of speaker systems at the same time. six-

31、39cl(f LOW FILTER SWITCH (15H2) Depress this switch in the event that turntable rumble, recording cutting noise or other low frequency noise becomes objectionable. Attenuation in the frequency band below 15Hz is 6dB/octave. G) HIGH FILTER SWITCH (8kHz) Depress this switch if record scratch noise or

32、other high frequency noise becomes objectionable. Attenuation in the frequency band above SkHz is 6dB/octave. ) POWER METER This meter allows you to read out the rated power level on the fluorescent display tube when speakers with a nominal impedance of 8 ohms are connected to the speaker terminals.

33、 DrAL POTNTER This pointer indicates the broadcasting stations. rnn STEREo rNDrcAToR This indicator lights up when receiving an FM stereo program if the FM muting off switch is released. oUARTZ LOCKED |ND|CATOR This indicator lights up after the optimum tuning point has been obtained and displays th

34、at the receiving state is stabilized by the built-in quartz lock circuit. D SIGNAL INDICATOR This indicator lights in sequence from left through right during the tuning of an AM or FM broadcast in accord- ance with the strength of the signals being received. The optimum tuning point is where the max

35、imum number of indicators light. rururNG rNDrcAToR When tuning in an FM station, the optimum reception point is indicated when the center indicator lights up. When the left indicator has come on, rotate the tuning knob slightly clockwise. When the right indicator comes on, rotate the knob slightly c

36、ounter-clockwise. FREOUENCY DISPLAY This indicates the frequency which is tuned. With FM reception, the letters FM appear on the left of the display and MHz on the right. With AM recep- tion, AM appears on the left and kHz on the right. These change when the function selector position is cha nged. T

37、UNING KNOB Use this knob to tune in to broadcasting stations. 5 FM MUTING OFF SWITCH When this switch is released and an FM broadcast tuned in, the muting circuit is activated inside to suppress the annoying interstation noise between the broadcasting frequencies for noise-free reception When the br

38、oadcast- ing station is far away or when receiving a station in a fringe area, set tne switch to the OFF position and then tune in. lf there is a broadcasting station with a strong signal level on the air next to a station whose program you want to receive, you may not be able to tune in satisfactor

39、ily because the sound will be drowned out by the stronger signals In cases like this set the FM MUTING OFF switch to OFF (depressed position) and tune in. The muting circuit does not work when the tuner is receiving AM broadcasts lf tuning has been performed after the FM MUTING OFF switch has been d

40、epressed and a station selected. the quartz locked circuit is set to the OF F mode and the LOCKED indicator does not light. FM 25PS SWITCH Depress this switch when listening to a Dolby* FM broadcast; otherwise keep this switch at the released position. ) BRIGHTNESS SELECTOR Use this switch to select

41、 the brightness of the power meter and the frequencY disPlaY BRIGHT: When using the receiver in daylight or other FUNCTION SELECTOR Deoress the function switch which corresponds to the program source. Turn the volume control down first before selecting a different function switch while the sound fro

42、m one program source is being reproduced FM: AM: Depress this switch for FM broadcasts Deoress this switch for AM broadcasts AUX: Depress this switch when listening to an audio component connected to the AUX iacks. PHONO 2: Depress this switch when playing a record on the turntable connected to the

43、PHONO 2 jac k s. PHONO 1: Depress this switch when playing a record on the turntable connected to the PHONO 1 i acks. NOTE: OnlY one function switch should be depressed at a ilme LOUDNESS SWlrcH When listening to a performance with the volume control turned down, depress this switch and the bass and

44、 treble will be accentuated When the volume is low, the human ear f inds it harder to hear the bass and treble than when the volume is high The loudness switch is thus designed to compensate for this def iciency. By depressing this switch the bass and treble come through much more strongly and the s

45、ound takes on a puncn even when the volume control is turned down. bright locations DIM: At night or in dark locations when the exist- ing brightness is too high *Theword,DolbyisatrademarkofDoIbyLaboratoriesInc. 3. BLOCK DIAGRAM Tuner Section sx-39clcl OUARIZ LOCKEOAM TUNER A M O Audio Section IAPE

46、1 _-. .:- ADAPrcR REC PLAY OUT IN R CnANNE- . IHL SAME A5 IHF L CHANEL ) FREA!ENCY a r l r UIER SECTION FL TUSE rc ( HAl2010 ) 5-POINT SIGNAL INDICATOR ORIVE rUNNG INDICATOR FREOUINCY OISPLAY FM MHz , O D D D , t_, t_t.t_t t_t A M K H T CoUNTER Oi - D5 TIME DIVISION 7- SE6MNT OECODR ROM s1 s2 s3 s4

47、4. CIRCUIT DESCRIPTIONS 4.1 FM TUNER SECTION Front End The FM front end of SX-3900 includes a 4 ganged tuning capacitor, a dual-gate MOS FET- EoTooA l-slage RF amplifier and a modified ai; circuit llcal oscillator This oscillator is a uoiiug controled oscillator employing a vari-cap (variable capaci

48、tance diode) When the.quartz-lock ,yrt.t (refer to Quartz-lock system) is not in operution, a constant voltage is applied to the diode. lF Amplifier and Detector These employ 3 ICs and 3 dual-element ceramic filters. fne lC (HA1201) of the first 2 stage con- stitutes a single-stage differential ampl

49、ifier current- ii-lti.rg limitet. The IC (PA300?-A)-in the third stage, an improvement on the former iF system IC liigool ai, includes an iF iimiter amplifier quadrature detector, meter drive and other cir- cuits. Performance in terms of distortion S/N ratio, delay characteristics, and other parameters ,ho*, a marked improvement in comparison to the PA3001-A. Ouartz-Lock SYstem The quartz-lock system featured in the