Pioneer-SA9500-int-sm电路图 维修手册.pdf

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1、t- (a- (:r l I t f O r / h (DrqoNeErl RadioFans.CN 收音机爱 好者资料库 f sA-9Eootr MODEL SA-95OOII COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS: This service manual is applicable to the KU-type. When repairing the KC-type, HG-type, S-type, please see the additional service manual. CONTENTS 1. SPECTFTCATIO

2、NS . 5 2. CONNECTION DIAGRAM 6 3. FRONT PANEL FACILITIES . . 7 4. BLOCK DIAGRAM 9 5. CIRCUITDESCRIPTIONS 5.1 Equalizer Amplif ier 11 5.2 Tone Controls 11 5.3 Power Amplifier 12 5.4 Protection Circuit 13 5.5 Power Supply Circuit 14 6. LEVEL DIAGRAM 15 7. DISASSEMBLY . 16 8. PARTS LOCATION 8.1 Front P

3、anel View 18 8.2 Front View with Panel Removed . . 19 8.3 Top View 20 8.4 Bottom View . 21 8.5 Rear View 22 ADJUSTMENT 23 EXPLODED VIEWS 24 SCHEMATIC DIAGRAMS, P.C. BOARD PATTERNS AND PARTS LIST 11.1 Miscellanea 32 11.2 Schematic Diagram 33 , t t 9. 10. 1 1 . 3 UL (U.S.A.) approved CSA (Canada) appr

4、oved 22OV and 24OV (Switchable) SEMKO (Sweden), NEMKO (Norway), DEMKO (Denmark) and El (Finland) approved 1 2OV. 22Ov and 24OV (Switchable)General export model RadioFans.CN 收音机爱 好者资料库 11.3 tI.4 11.5 11.6 11.7 11.8 12. PACKING Switch Assembly (AWS-1 09) Switch Assembly (AWS-1 02) Phono Jack Assembly

5、(AWX-107) Equalizer Amplifier Assembly (AWF-024) Control Amplifier Assembly (AWG-045) Power Amplifier Assembly (AWH-052) 35 41 42 45 46 50 53 RadioFans.CN 收音机爱 好者资料库 1. SPECIFICATIONS Semiconductor Transistors 55 Diodes 33 Power Amplifier Section Circuitry . . . 2-stage differential amplilier Parall

6、cl PP direct-couoled OCL. Continuous Power Output form 20 Hertz to 20,000 Hertz (Both channels driven) . . 80 watts per channel (8 ohms) I00 watts per channel (4 ohms) Total Harmonic Distortion at2jHertz. to 20,000Hertz Continuous rated power output . . 0.05% 4Owatts pcr channel power output, 8ohms

7、. . . . 0.01% lwattperchannel poweroutput, 8ohms . . . . . . 0.01% Intcrmodulation Distortion Continuous rated powcr output . 0.05% 4Owatts per channel power output, 8ohms . . . . 0.0l% l watt per channel power output, 8ohms . 0.01% Frequency Responsc 5Hertz to I00,000Hertz ltdB I nput (Sensitivity/

8、l mpedance) POWER Al4P lN V/5Okohms Output . Speaker A , B , A + B Headphone: Lowimpedance Damping Factor (2Hertt to 20,000Hertz,8ohms) . . . 30 Hum and Noisc (lHF, short-circuired, A network) . . l l0dB Preamplifier Section Circu itry Equalizer amplifier: 1st stage differential amplifier 3- stage d

9、irect-coupled A class SEPP. Control amplifier: .l st stagc differential amplif ter 2- stage direct-coupled, N FB type. I nput (Sensitivity/l mpedance) P H O N O l . . . . 2 . 5 m Y 1 1 0 , 2 5 , 5 0 , 1 0 O k o h m s P H O N O 2 . . . . 2 . 5 m Y l 1 0 , 2 5 , 5 0 , l O O k o h m s C A R T R I D G E

10、 L O A D . . . B o t h P H O N O I a n d 2 , 100, 200,300,400pF TUNER 150mV/50kohms AUX 150mV/50kohms T A P E P L A Y I . . . . 1 5 0 m V / 5 0 k o h m s T A P E P L A Y 2 . . . . l 5 0 m V / 5 0 k o h m s PHONO Ovcrload Level ( f .H.D. : 0.05%) P H O N O | . . . .300mV (l kHz) 300mV (l kHz)PHONO 2

11、Ou tput (Level/l mpcdance) sA-s|500II Total Harmonic Distortion (20H2 to 20,000H2) . 0.01% Frcqucncy Rcsponsc PHONO (RIAA Lqualiz.rtion).2OHt to 20,000H2 10.2d B . . 5Hz to 50,000H2 _,1d8 MAIN t8dB (100H2) suB 16dB (SOHz) MAIN 18dB (10kHz) SUB 16dB (zOrHz) TUNER, AUX, TAPE PLAY lonc Contrrrl (2dB st

12、cp) fRE B Lf Filtcr LOW BASS c . . l50mV . . . . . . tu)io,n.r,oupoon,.rt,t;Il H I C , H . Loudncss Contour (Volumc control sc1 a1 -40dB position) Hum and Noisc (lHF, shorl-circuilcd, A network) PHONO75dB TUNIR, AUX, TAPE PLAY . . . .95d8 M u t i n g . . 0 , - 2 0 d 8 Miscellaneous Powcr Rcquircmcnt

13、s . . . l20V 60Hz only. Powcr Consumption 230watts (U L) 490VA (CSA), 560watts (Max.) D i m c n s i o n s . . . . 4 2 0 ( W ) x 1 5 0 ( H ) x 3 7 6 ( D ) m m 16-9116 x 5 118 x 14 13116 in Weight. Without Package: l6kg (351b 4oz) With Packagc: 11 .9kg (391b 7 ot) Furnished Parts O p e r a t i n g l n

14、 s l r u c t i o n s . . . . . . 1 Connection Cord with Pin Plugs l Hcx. Wrcnch (Used for lastening Volumc Knob) . . . . . . 1 NOTE: Specifications and the design subject to possible modifica- lion utithout notice due to improuements. I5Hz (6dB/oct.) 8kHz (6dB/oct.) +6dB (100H2) +3dB (10kHz) F tr F

15、9., B l t E TAPE REC 1 TAPE REC 2 PRE OUT . . 5 2. CONNECTION DIAGRAM TURNTABLE 1T U N E R UT- PUT TURNTABLE 2 Connect to ground terminals of turntables, tu ner, tape deck, etc. G R O U N D L E A D G R O U N D I N G TO EARTH A SPEAKER SYSTEM C A R T R I D G E TAPE PLAYER OUTPUT L I N E TAPE DECK 1 D

16、 E C K 2 INE OUTPUT sA-95001I A C C O R D L I N E I N P U T B SPEAKER SYSTEM o o f- - jr)- aJ tf f,.:-.Tl-l r ppr;l (-) rr f-l f-l l.-l t o t t . t L r - r - ller:,4ll E o - - . t - i g - J l r : ? l E f N V E N FI l E l ,a, F F I tt I lEl 16l :E OUTLE a - : C-D (-D 3. FRONT PANEL FACILITIES POWER S

17、WITCH Set to ON position to energize SA 950011. After setting to ON, there is a brief delay before sound is obtained. This is due to the operation of the muting circuit which prevents noise when the POWER is switched. This func- tion does not indicate difficulty and normal opcrating condition is att

18、aincd in a fcw seconds. The POWER switch also controls the rear pancl SWITCHED convenicnce outlets. TONE SWITCH In the ON position, tone adjustments can bc performcd with the BASS and TREBLE twin controls. When set to the upper (OFF) position, the tone control circuits are disengaged and frequency r

19、csponse is flat. This function is convenient for checking phono cartridge and speaker tone quality and listening room acoustic5. BASS TWIN CONTROLS Controls for adjusting low frequency tones. l00Hz: Adjusts frcquencies below 400H2. With respect 50Hz: to 100H2, ad justment range is :t8dB. Provides ad

20、ditional adjustment to the .l 00Hz control for the band below 200H2. Adjustment range with respect t n J. I L 3 7 - 1 s+o S+a-d TAPE MONIr0R 1 - I A P E 1 2 O F F 3. TAPE 2 Sso-c 110DE I R E V 2 . S T E R E O 3 . L + 3 . + . t 5 R S s a , u Y I U T I N G O F F - Sro,u LOUDNESS OFF - Seo,b HIGH FITTE

21、R OfF - Sso,u Ow FILTIR E - Sqa PH0N0 1(q-o Pfl0N0 2 st+r 1b . S PRE POW Ssu Ssa - PLAY 1 L R E C - PLAY 2 L REC 2 PHONO I 4 . A U X 2 200 pF 1. 400 pF 2 OFF -20d B ON B k H z 15 Hz S i o a , b S r t a - d : S , n v tL o v t J Sr+a , u OFF - ON 2 . A 3 . B CONTROL AIlPLIFIE BASS 50Hz BASS 100H z VRs

22、 -l*rn t* : lrnr our VRe POWER r- L AIlPLIFIER I Sroa vR+ TREBLE 10kHz TREBTE 20kHz NTROL AlPLIFIER ONTROLAIl PLIFIE TO NE S P E A K E R 1 . O F F 4. A+B RE LAY P O NE R O FF -O N R SELE CTOR 1 . l 0 k 0 7 2 5 k 0 3. s0kQ, -+ l00ka, PROTECTTON CIRCUIT T To Lch powen aP To contno I amp To power amP T

23、o egualizen amP To pr-otection clrcuit To power amP To control amP fs eQua lizen amp ss oc L I T V Rs -J 1,oNEs L FFT CHANNEL RIGHT CHANNE L Q .L rgr, T I + OUT ER IN Q . * tso L PRE POW S t o a , b : S r t o - d S , Srs St+a,b - 0 N 3 B OFF z . A - ,tP SPE AK ER P0WER AMPLIIIIR S P EAKTR To pnotect

24、ion crrcurT l-o R ch power 5. CIRCUIT DESCRIPTIONS FUNCTION S|IICH 7=l20(a C = 100pF PHONO 2 PHONO I CARTRIDGE LOAD + siA-s|5clcltr OUT Fig. 1. Schematic diagram for equalizer amplifier 5.1 EOUALIZER AMPLIFIER The circuit diagram for the equalizer amplifier is shown in Fig. 1. The two separate phono

25、 inputs are selected by the FUNCTION selector on the front panel. The input resistance and input capacitance can both be adjusted to 4 different levels (R=l0kCl, 25kO, 50kA and 100kO, C=1-00pF, 200pF, 300pF and 400pF) by means of the CARTRIDGE LOAD control knobs (R and C) which switches in and out,

26、additional resistors and capacitors in parallel with the input terminal. Hence, optimum load condi- tions for different phono carbridges can be ad- justed, as well as modifying the cartridges fre- quency response in the high frequency range and thus producing variations in its characteristics. The f

27、irst stage of the equalizer amplifier (Q, Center Point Potential Detector Circuit If a DC potential is produced at the junction point of the power amplifier, a command is sent to the relay drive circuit. Fig. 10 shows this operating principle. Q, and Qa compose a differential amplifier. When the sam

28、e input is applied to both input terminals (Q. and Qo bases), no output is present. However, if there is a difference between the terminal inputs, the difference is amplified and becomes the output between the two collectors. During normal opera- tion, an AC signal only is present at the junction po

29、int. As C2 reactance is sufficiently low, the same signal is applied to Q. and Qa bases, resulting in an absence of output at the collector sides. When a DC potential is produced at the junction point, it becomes the input of Q, only. If the voltage is negative, Q, collector current declines. and at

30、 Qa the collector current increases and the potential drops, causing current to flow through Do. If the DC voltage is positive, Q, collector current increases and the potential drops, while at Qa the collector current decreases and the potential rises. Current therefore flows through Ds. Power ornpi

31、 ifier Fig. 10. Basic circuitry for center point potential detector 5.5 POWER SUPPLY CIRCUIT In the power stage, power is supplied independ- ently to both left and right channels, using 2 separate power transformers. Separate bridge recti- fiers (one for each channel) and 1-2,000pF (x 2) capacitors

32、to provide the plus and minus voltages. Power for other sections is supplied via a bridge rectifier connected in series to separate windings (not those used for the power amplifier) feeding plus and minus voltage regulator circuit. sA-ssclcltr 6. LEVEL DIAGRAM Balance Volume PRE OUT I v w r r t r v

33、l amplrfrer 1 amPlifier I 11l I ri rrl li 6 z v o Z 1 J L! U _) l I I I I I L SPEAKER i i (26.8v/80 I I I I l ! fr ll ri t; li 28. 5dB /Power amolif ier / PRE ( OU rv) T TAPE, AUX -_ ( 1 50mV) _ + - rO 5dB r I | 20dB 35. 5dB | (Mutine oN) / Eoualrzer | rprtli i -r- P110NO (2. 5mV) 7. DISASSEM BLY Fr

34、ont Panel Loosen the setscpews of VOLUME knob with a hexagonal wrench. Remove all the knobs by pulling. Remove the four nuts (B). Bottom Plate Remove the ten screws (C). Top Gover Remove the four screws (A). 1 6 Control Amplifier Assembly Remove the three screws (D). Power Amplifier Block ( L) itch

35、Assembly sA-9Eootr Power Amplifier Block (R) Remove the three screws (F). Amplifier Assembly Remove the two screws (H). D Remove the seven screws (J). 1 7 8. 8.1 PARTS LOCATION FRONT PANEL VIEW Knob (BASS) AAB.1 1 6 Knob (TON E ) AAD.1 ,I7 Front panel ANB-480 Knob (TREBLE) AAB.l 1 6 Knob (CARTR IDGE

36、 LOAD) AAB 1 17 Knob (VOLUI4 E ) AAB- 1 14 Knob (FUNCTION) AAB.1 15 o, fr* F rl Knob (SPEAKERS) Knob (BALANCE) Knob (POWE R ) AAD,l I7 AAB.l 1 6AAB I 16 Knob (lilODE) AAB.l 1 6 Knob (MUTING) AAD ,I ,17 Knob (TAPE) AAD,l 17 Phone jack (PHONES) Knob (FtLTER) AKN,OOS A A D .117 Knob (LOU DNESS) AAD.l 1

37、7 8.2 FRONT VIEW WITH PANEL REMOVED Variable reststor (BASS 100H 2 ) ACV 175 Variable resistor (BASS 50Hz) ACV 176 Rubber bracket AEB.092 Variable resistor (voLUr!1E) ACV-171 siA-9500tr Rotary switch (CARTR IDGE LOAD ) AS D.O 55 Rotary switch (FUNCTION) ASD,O52 Variable resistor (TREBLE 20kH z ) ACV

38、 173 Lever switch (TONE) ASK 109 Variable resistor (TR EBLE 1OkH z) ACV.174 f.f E-E; n n./;) t Inn. o K; Larnp with leads 8V, 50mA AE 1,069 Lever switch (POWE R ) ASK.1 24 Phone jack (PHON ES) AKN.OOB Variallle resistor (BALANCE) ACV _112 Lever switch (H IGH FILTER) ASK 1 10 Lever switch (LOW F ILTE

39、R ) ASK.1 1 O Rotar y swllch (SPEAKERS) ASD 054 Lever switch (TAPE INON ITOR ) ASK,113 Lever switch TAPE DUPLICATE) ASK- i 13 Rotary switch (l,4ODE) ASD 053 Lever switch (t4uTtNG) ASK. 1O Lever swrtch (LOUDNESS) ASK. 1 1O 8.3 TOP VIEW Equalizer amplifier assembly AWF-O24 Variable resistor (vo LUr4E)

40、 ACV 171 Control ampl itier assembly AWG-045 Switch assembly AWS-109 Power amplif ier assembly AWH-052 Power transJormer (R) ATT.375 Electrolytic capacitor 12,000sF 63V ACH-065 Power amplilier assembly AWH 052 Power transformer (L) ATT,374 a I sA-s5c,0II 8.4 BOTTOM VIEW Switch assembly AWS 109 Lever

41、 switch (POWER ) ASK 1 24 ,-f, ,L - riL rlf t Power amplif ier assemt)ly AWH,O52 Electrolytic capacitor I 2.000! F 63V ACH 065 Power amplif ier assembly AWH 052 ? 1 8.5 REAR VIEW Terminal (PHONO) AKB.O27 Terminal SPEAKERS) AKE-026 Terminal (TUNE R/AUX) AKB.O36 Terminal (TAPE 1 ) AKB-035 Terminal (TA

42、PE 2) AKB-035 Terminal (PR E/POWER AMP) AKB-035 Screw for ground (GND) AKE-O3O AC power cord ADG-OO5 AC socket (AC OUTLETS) AKP.OO4 22 7 A9. ADJUSTMENT The SA-9500 ll amplifier employs the same type of power amplifier assembly in both left and right channels. Any adjustment will thus have to be iden

43、tica.l in both channels, and is limited to adjust- ments of the idler current. 1. Disconnect the jumper plugs, and terminate the POWER IN terminals with a 5.1k(2 resistoru. 2. Connect 8Sl resistors to the SPEAKERS A terminals, and set the SPEAKERS switch to A. 3. Turn VR, in fully a counter-clockwis

44、e. 4. Tum the POWER switch ON, and then readjust VR, so that the voltage between terminals No. 3 (+) and No. 9 ( ) reads 30mV. 5. Now check that the voltage belween terminals No. 6 (+) and No. 12 ( ) reads 30mV t10mV (in order to check the current distribution, since the final stages are in parallel

45、 ). 6. Leave the amplifier ON for about 30 minutes, then repeat steps 4 and 5. 7. Finally, apply an actual signal, and check for no crossover distortion. .A sA-s5clclu 5.1kQ resistors Jumper plugs DC Voltmeter s a 10. EXPLODED VIEWS NOMENCLATURE OF SCREWS, WASHERS, AND NUTS The following symbols sta

46、nd for screws, washers and nuts as shown in exploded view. SymbolDescriptionShape RTBrazier head tapping screw PTPan head tapping screw BTBinding head tapping screw $: CTCountersunk head tapping screw ): TTTruss head tapping screw F ocT Oval countersunk head tapping screwF PMPan head machine screw G

47、- CM Countersunk head machine screwF ocM Oval countersunk head machine screwF TMTruss head machine screw F BMBinding head machine screw /F PSA Pan head screw with spring lock washerGE PS8 Pan head screw with spring lock washer and flat washerGh PSFPan head screw with flat washer d- F ffi FW9dx1t TI

48、T-,6i.knessinmm(r) -* tl | | diameter in mm (d ) f-J l:_l Svmbol SymbolOescriptionShape EWE type washer ( P f l DI FWFlat washer SWSpring lock washer $ NNut B WNWasher faced nut f l ITWInternal toothed lock washer OTWOuternal toothed lock washerdAs I qxP t scSlotted set screw (Cone point) C E D SFSl

49、otted set screw (Flat point) e E t HS Hexagon socket headless set screw ocw Oval countersunk head wood screw CWCountersunk head wood screw RWRound head wood screw Top cover ANE.1 17Screw 4x8 ABA-079 Knob (POWER) AAD.117 Washer faced nut M9 ABN.O24 Knob (SPEAKERS) AAB-1 16 Washer faced nut M9 ABN-024 Part i See p G Screw 4x8 ABA-079 RT3xO q q Knob (BASS) AAB-1 16 Knob (TONE) AAD-117 Knob (TR EBLE) AAB.1 16 Part 1 See pa