Pioneer-SX303-rec-sm电路图 维修手册.pdf

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1、: - _ t I I (D rrloNEEFl ORDER NO. ARP- 232-0 AM/FM STEREO RECETVER sixr3Gl3 o This service manual is applicable to the KU types. For servicing of the other types, please refer to the additional service manual. o Ge manuel dinstruction se refdre au mode de r6glage, en frangais. o Este manual de serv

2、icio trata del m6todo de ajuste escrito en espafiol. CONTENTS 1 . 2. 3. 4. 5, 6. 7. SPECIFICATIONS FRONT PANEL FACILITIES PARTS LOCATION BLOCK DIAGRAM CIRCUIT DESCRIPTIONS . PACKING EXPLODED VIEW AND PARTS LIST 2 3 4 5 6 8 9 8. P.C. BOARDS CONNECTION DIAGRAM 12 9. SCHEMATIC DIAGRAM 15 10. ELECTRICAL

3、 PARTS LIST . . 17 1 1 . D I A L C O R D S T R I N G I N G . . . . . . 1 9 12. ADJUSTMENTS. 20 nEcucr 22 AJUSTE . 24 PICINEEFI ELECTFICINIC CclFlPClFIATIClN 4-1, Meguno 1-chome, Mesuno-ku, Tokyo 1F3, Japan FIC|NEEFI ELECTFICINI9 IUAAI lNC. 1925 E. Dorninguez St., Long Beech, Catifonnia gOB1O U.S.A.

4、FfoNEEFI ELEcrFloNlc EuFtoPEI N.v. Keerbengtean 1,e74o Bevenen, Betgium PI(NEEFf ELECTFICINIGB AUaTFIALIA FTY. t-lO. lzA-le4 Boundany Ftoad, Bnaeside, Victonier 819F, .Ausrnatia MODEL SX-303 (SX-303L) COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS: Model Voltage Remarks sx-303/KUAC120V only U.S.A.

5、model sx-303/KcAC120V only Canada model sx-303/sAC1 1 0V, l2OV ,22OV and 24OV (switchabte) General export model SX-303L/HEAC220V only European continent model with AM-LW band tuner sx-303L/HEZAC220V only West germany model with AM-LW band tuner YX O DEC. 1982 Printed in lapan RadioFans.CN 收音机爱 好者资料库

6、 1. SPECIFICATIONS Amplifier Section Continuous Average Power Output is 45 watts* per channel, min., at 8 ohms f rom 40Hertz to 20,000 Hertz with no more than 0.3o/o total harmonic distortion. Total Harmonic Distortion (40 Hertz to 20,fi)0 Hertz, I ohms, from TAPE) continuous rated povrrcr output No

7、 more than 0.3% 22.5watts per channel power output . . . . No more than O.15yo I watt per channel power output l*r.irriioiri.r,iit,ir,rlrt,illiJir1=t;?1, 8 ohms, from AUX) continuous rated power output No more than 0.3% Damping Factor (1 kHz, 8 ohms) 22 I nput (Sensitivity/l mpedance) P H O N O . .

8、. . . 2 . s m V / S 0 k i l o h m s TAPE PLAY . . . 150 mV/50 kilohms Phono Overload Level (T.H.D.0.1%. 1,000H2) PHONO . . 150mV Output Level TAPE REC . 150 mV SPEAKER A, B, A series B, off Frequency Response PHONO (RIAA Equalization) . 30Hz to 20,000H2t0.5d8 TAPE PLAY 15Hz to SO,OOOHz+OA Tone Contr

9、ol BASS . i9dB (100H2) TREBLE 19dB (10kHz) Loudness Contour (Volum control setat-40d8 position) . . +8dB (100H2), +6dB (10,000H2) Hum and Noise (lHF, short circuited, A network) PHONO MM . 71dB T A P E P L A Y . . . . . . 9 7 d 8 FM Tuner Section* UsableSensitivity. .10.7d8f(O.9pV) 50dB Ouieting Sen

10、sitivity MONO .15.3dBf (1.6pV) STEREO .37.6d8f (211ty1 Signal-to-Noise Ratio M O N O . . . 7 5 d 8 ( a t 8 5 d B f ) STEREO . . 70dB (at 85dBf) Distortion (at 65dBf) M O N O l k H z . . . . 0 . 3 Y o S T E R E O l k H z . . . . O . 6 Y o CaptureRatio . .2.5d8 Alternate Channel Selectivity (400kHzl .

11、 . 50dB Stereo Separation (lkHz) . . 35dB Frequency Response . 30Hzto lSkHz,1ffOt S p u r i o u s R e s p o n s e R a t i o . . . . . . . 7 f t 8 lmageResponseRatio .45d8 l F R e s p o n s e R a t i o . . . . . 1 0 0 d 8 AMSuppressionRatio .45d8 S u b c a r r i e r P r o d u c t R a t i o . . . . .

12、. . 3 1 d 8 Muting Threshold 27dBf (6.3pV) Antenna Input . . . 300 ohms balanced, 75 ohms unbalanced AM Tuner Section Sensitivity f HF, Loop antenna 32O1N lm lHF, Ext. antenna 30gV Selectivity . 2ft8 Signal-to-Noise Ratio . . . .43d8 lmage Response Ratio .40d8 l F R e s p o n s e R a t i o . . . . .

13、 . 4 5 d 8 Antenna AM Loop Antenna Miscellaneous Power Requirements . AC 120 V, 60Hz Power Consumption . . . 190 Watts(UL), 22S VA(CSA) Dimensions . . . 42O (W) x 98 lHl x 214 (D) mm 16-9/16(W) X 3-718(H) X 8-7116(D) in Weight (without package) . .5 kS (11 tO) Furnished Parts F M T - t y p e A n t e

14、 n n a . . . . . . 1 A M I - o o p A n t e n n a . . . . . . . . 1 Operating Instructions 1 Measured pursuant to the Federal Trade Commissions Trade Regulation rule on Povver Output Claims for Amplifier. *FM muting functions with this unit when the signals are weak. The units internal wires are ther

15、efore treated so that the signals are not muted when the sensitivity is measured. NOTE: Specifications and design subject to possible modification without notice. 2 RadioFans.CN 收音机爱 好者资料库 2. FRONT PANEL FACILITIES O powen swrrcH Push this to wrritch on and off the units power. Power is supplied at

16、the depressed (r) switch position (ON) and turned off at the released (I) position (OFF). HenopHoNE JAcK Connect the plug on the stereo headphones to this jack when listening to sound through headphones. rorue coNTRoLs BASS : Thebass is increased whenthiscontrol isrotated clockwise from the center p

17、osition and reduced when rotated counterclockwise. TREBLE : The treble is increased when this control is rotated clockwise from the center position and reduced when rotated counterclockwise. eeLeNcE coNTRoL This is normally kept at its center position. lt is rotated when the volume of sound delivere

18、d through the left and right channels of the speakers or headphones differs. The right channel volume is reduced when the control is rotatd toward the LEFT from the center position while the left channel volume is reduced when it is rotated toward the RIGHT. rurucrroN swrrcHEs PHONO : Press when lis

19、tening to records. FM : Press when listening to FM broadcasts. AM : Press when listening to AM broadcasts. rape (ADPT) swrrcH This is depressed when using a tape deck or adaptor unit connected to the rear panel TAPE/ADAPTOR jacks. o LouorrrEss swtTcH Depress this svrritch to the ON position when lis

20、tening to sound at a low level of volume. This will enhance the bass and treble and give more life to the sound even at a low volume. voluruE coNTRoL Use this to adjust the volume of the sound delivered through the speakers or headphones. The volume is increased when this control is rotated clockwis

21、e from the minimum 0 position. ruruIruG tNDIcAToR (TUNING) This lights up to indicate that an FM, AM station has been tuned in. sreneo rNDrcAToR (srEREo) This lights up automatically when an FM station broad- casting in stereo has been tuned in. speerERs swrrcHEs These are used to select the speaker

22、s through which you will listen to the sound. The selected speakers are now working. A: The sound is heard from the speakers connected to the speaker A terminals on the rear panel. B: The sound is heard from the speakers connected to the speaker B terminals on the rear panel. No sound will be heard

23、when SPEAKERS A and B switches are both released. This is the position at which the sound can be heard through the headphones. NOTE: No rcund will be heard through the spakers when both the A and B switches are depressed if only one set of speakers has been connected to either the A or I SPEAKE RS t

24、erminals. FREoUENcY scALE This indicates the frequency of the broadcasting station (FM, AM). The top level figures (88 - 108) indicate the FM band. The bottom level figures (55 - 160) indicate the AM band. TUNTNG KNoB Rotate this knob to pick up stations (FM, AM). POWER |ND|CATOR RadioFans.CN 收音机爱 好

25、者资料库 3. PARTS LOCATION Front Panel View Speaker knob AAD60A Front panel assembly NOTES: . Parts without part nu ber connot be supplied. . The b morh found on aome component ports indicates the importonce of the sofety factor of the port- Thereforc, uhen replocing, be 6ure to use ports of id.enticol

26、designation. . For your Potts Stock Control, the fost mot)ing items are indicated u)ith the moths ta and l. GENERALLY MOWS FASTER THAN . Thb claesificotion shall be odjusted by eoch di;tributor becouse it deDends on model numbe f , te mperature, humidity, e tc. Bonnet ANE4lO ANM-293 AAD$O5 .-:.n f,-

27、 Knob A (vo LU1M E) AAB316 Function knob A TAPE, LOUDNESS) AAD06 Function knob B (PHONO, FM, AM) AAD607 Phone jack AKN-(X5 Knob B (BASS, TREBLE, BALANCE) AAB3I7 Rear Panel View Earth terminal Complex terminal AKX73 Top View lr*t Fuse (T2.5A) AEK-123 A* Push swirch (POWER ASG-541 A ac socket AKP.O39

28、AWB44 * tc M5153L Switch assembly 4. BLOCK DIAGRAM FRONT END (1/3) T | 3OOO . BAL FM I L r rrupar l- cND AM I LOOP L ANT FM M I X A M P LED DRIVERFM MUTE AM FRONT ENO 5dtl sr-l PHONO F M ( L c h ) F M ( R c h ) l- crav Lch REC i- ,oo f eiror,ro Rch REC l- .o s r - 4 TAPE (t/? ) s r - 5 LO U ON ESS (

29、 ? / 2 ) TONE CONTROL vR2-2,2-3 EQUALIZER AMP lzsmrl tEry I pHoNEs TO r_- 134,4/41 Rch SPEAKE RS ac r20v 60 Hr +92 ( 15.4V s 2 - 2 S P - B (vzl s 2 - l S P - A l t / 2 ) l I o , , SI-l : FUtCTION (PHOtlO) S I - 2 : F U N C T I O N F M ) sr-5 : FUtcTroN ( AM) SI-4 : TAPE MONITOR sr-5: LouoNEss 9!L- o

30、FF oN -.9!E oN -.g_Eq ON -qEE or -_q! S 2 . I : S P E A K E R S S 2 . 2 : S P E A X E R S 07 I _9_l!- - oFF !-!L - oFF F M . I F A M P FT.I IF,/OET MPX RE6ULA. rfrR t x METER OETECTOR r-;1-l rcr i lrJ i I t f r I lt/2) | (t/4) ffi-Dt o=o POWER AMP s r - 4 s r - 5 | 2/2 t (2/2 ) AM IF AMP +82 AM 04 P

31、OWER ON,/OFF MUTING POWER SUPPLY A PROTECTOR sror i PoWER oil - oFF 5 5. CIRCUIT DESCRIPTIONS FM Front End A unitized variable capacitor type front end unit is used consisting of an FET RF single stage amp, local oscillator/mixer IC and an IF trans- former. FM lF Amp, Detector and MPX Circuit A 2-tr

32、ansistor IF amp with ceramic filter is used and the next stage has an IC (M51533L) contain- ing the FM IF detdctor and MPX circuit. The block diagram of IC M51533L is shown in Fig. 5-1. This IC uses a peak detection method which can be adjusted with a single coil. The PLL method is employed to recon

33、stitute the 38kHz sub-carrier for the MPX circuit. The IF signal is input at pin 1 and the detection output is obtained from pin 5. The detection out- put passes through the muting Q4, goes to pin 9, passes through the MPX circuit and the stereo signals are obtained frorn pins 11 and 12. In addition

34、, this unit detects the presence or absence I L OUT R OUT of a pilot signal to automatically switch between stereo and mono reception by R14 which is con- nected to pin 14. When a stereo signal is received, pin 13 drops to the low level to light the stereo indicator. When pin 2 is grounded, the PLL

35、VCO and FM IF operation stop (for AM). FM Muting and LED Driver With this unit, muting is automatically activated when the antenna input drops below 10pV. As the antenna input decreases, the voltage at pin 3 drops, Q5 is turned off and Q6 is turned on. As a result, the gate voltage of Q4 drops, Q4 i

36、s turned off and the detector output circuit is blocked (Fig. 5-1). When an FM or AM station is tuned in, the base potential of Q5 is raised, Q5 is turned on and the tuning indicator lights. n r t r F ? ? | OETECTOR I N P U T BU FFER L E V E L M E T E R C I R C U I T S TER EO 5W rTC H Fig.5-1 FM lF,

37、 Detector and MPX circuit AM Tuner This uses a variable capacitor type tuning circuit composed of three transistors, a 2-fuan- sistor front end and a single transistor AM IF detector. AF Section The equalizer circuit has a low-noise operation amp (2 channel) M5218P. The power amp has a 45 watt outpu

38、t power IC STK4141-2S (See Fig. 5-4). The tone control circuit is placed in the negative feedback loop of the power amp. Protective Circuits This unit has a circuit to detect DC voltages at the power amp outputs and a muting circuit that operates when power is turned on and off. Fig. 5-2 shows the c

39、onstruction of the DC voltage protection circuit. When a DC voltage appears at the power amp output, either Q13 (plus) or Q14 (minus) is activated depending on the polarity of the DC voltage and a trigger is applied to D15. This turns on D15, +81 is shorted, the fuse on the primary side is cut and t

40、he power supply circuit is shut off. Fig. 5-3 shows the power on/off muting circuit. Time constant t1 is longer than t2 so that imme- diately after the power is turned on, the emitter potential of Q15 exceeds its base potential, Q15 is turned on to activate Q16 and Q17 and ground the signal. A few s

41、econds later, the base potential of Q15 rises to turn off Q15 along with Q16 and e1Z. When the power is turned off, the charge of C161 passes through D18; it is almost completely discharged in an instant to make the base potential of Q15 zero. However, because the charge of C160 remains, Q15 is turn

42、ed on and muting is activated in the same manner as when power is turned on. TO SPEAKE R SWITCHES Fig. 5-2 DC Voltage protection circuit T O P O W E R A M P t r , r 2 POWER AMP ( L ch ) Fig. 5-3 Power ON/OFF muting circuit const ont I rN r(+)l 2 rN l(- ) 6. PACKING t a OUT 2 Equivalent circuit of po

43、wer lC r 8 t N 2 ( + ) t 7 r N 2 ( - ) GND 68 MUTING Fis.5-4 9 VEE fi I I . J t 6 GN to OUT I Mark No. Part No.Doscription 1 . 2. 3. 4. 5. AHA.335 AR8526 ATB76 ADH.OOS AHE-107 Side pad Operating instructions (English ) Loop antenna assembly T-type antenna Packing case a T.EXPLODED VIEW AND PARTS LIS

44、T NO?ES: o Parts without part number cannot be supplied. o The S marh found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identicol designotion. o For your Parts Stoch Control, the fast mouing items are indicated

45、 with the morhs t* ond *. *T GENERALLY MOWS TASTER THAN ). This classification shall be adjusted by each distributor because it depends on model number, temperaturc, humidity, e tc. lVlark No. Part No. DecriptionsMark No. Part No. Description 1. ANE410 Bonnet 2. BBZ30P080FZK Screw (3 x 8) A * 3. ATT

46、-944 Power transformer 120V 4. PMZ30PO60FMC Screw (3 x 6l 5, AADO8 Speaker knob 6. VMZ30P06OFMC Screw(3x6) 7. NK9OFUC Nut 8. AAB-317 Knob B BASS, TREBLE, BALANCE 9. NKT0FUC Nut 10. AAAO84 Tuning knob 11. A48-316 Knob A (VOLUME) 12. ANM-293 Front panel assembly 13. AAD07 Function knob B (PHONO, FM, A

47、M) 14. AAD06 Function knob A (TAPE. LOUDNESS A * ts. ASG-541 Pushswitch (POWER) 16. AAD05 Power knob 17. AEC-784 Cabinet bumper 18. AXA-373 Tuning shaft 19. AEC471 Nylon rivet 20. MTZ3OPIOOFZK Screw (3 x 1O) a * zt. AEK-123 Fuse (T2.5A) A 22. AKP-039 AC socket A 23. ADG-073 Ac power cord 24. GWM-265

48、 Complex assembly 25, AKN-045 Phone Jack (PHONES) * 26. SUJSLYXSF Speaker switch A 27. ACGO17 Ceramic (0.01 ) 24. BBT30P080FZK Screw (3 x 8) 50. 51 . 52. 53. 54. 55. 56. 57. 58. 59. 60. 6 1 . 62. 63. 64. Speaker switch assembly Switch holder Pully assembly LED assembly Earth Mounting plate Pully ass

49、embly Pully assembly Pully holder Headphone jack assembly Chassis Bottom Plate Binder Earth terminal Rear panel Tuning drum Smoother Pointer holder Pointer assembly Heat sink Wire holder 65. 66. 67. 68. 69. I J A 321 /dt /rt B 2 t e ( -. Sr 8l ?v ,6rff h; C K l-F EA t l gw AYZ+- N 7- JFi /F/ D 3 l 2 I 21 t- h 2z a i lg 4 A 2 ) l-J- B C D 6 # S-d:) I 32 I I DIAGRAM8. P.C. BOARDS CONNECTION External Appearances of Transistors and lCs A 2SA 726S Lot No hFE