Pioneer-SX750-rec-sm维修电路原理图.pdf

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1、l* *.*.*-.- *B E t E b E : b alt fr F (DrrroNEEFr RadioFans.CN 收音机爱 好者资料库 - sx-75ct This Service Manual is applicable only to the KC, KU model. CONTENTS 1. SPECIFICATIONS BLOCK DIAGRAM FRONT PANEL FACILITIES 5 7 9 1 1 2. 3. 4. 5. CONNECTION DIAGRAM CIRCUIT DISCRIPTIONS 5.7 Protection Circuit 5.6 Ton

2、e Control 5.9 Power Supply 5.8 Power Amplifier Circuit 5.3 FM Muting Circuit 5.5 Microphone Circuit 5.4 Phono Equalizer Amplifier 5.1 AM Tuner 5.2 FM Tuner DISASSEMBLY 13 13 15 15 15 15 16 17 17 18 19 20 21 6. ADJUSTMENTS 6.1 AM Section 6.2 FM Section 6.3 MPX Adjusrment 6.4 Power Amplifier Section 7

3、. 8. 9. 10. DIAL CORD STRINGTNG 22 23 24 25 27 29 31 33 35 37 38 39 40 41 42 43 LEVEL DIAGRAM PARTS LOCATION 10.1 Front Panel View 1O.2 Front Panel View (with removd front panel) 10.3 Top View 10.5 Rear View 10.4 Bottom View 1I. EXPLODED VIEW 11.1 Part I 11.2 Part ll 1 1.3 Part I ll 11.4 Part lV 11.

4、5 Part V 1 1.6 Part Vl 11.7 Part Vl I RadioFans.CN 收音机爱 好者资料库 44 11.8 Packing. 12. SCHEMATIC DIAGRAMS P.C. BOARD PATTERNS AND PARTS LIST 12.1 SchematicDiagrams 12.2 MiscellaneousParts 12.3 Internal Circuitry of Integrated Circuits . . 48 12.4 Filterl?. BALANCE CONTROL For adjustment of relative outp

5、ut levels of L and R channels of speaker systems or headphones. Clockwise rotation from center position increases volume of R over L channel. Counterclockwise rotation increases volume of L channel over R. VOLUME CONTROL, For adjustment of speaker or headphone output level. Level increases with cloc

6、kwise rotation of knob- LOUDNESS SWITCH SIGNAL METER For FM and AM reception, needle of the SIGNAL meter the right. turn TUNING knob until is deflected a maximum to level, placing this switch in response in low and high FALANCI FM TUI With thr right, fi TUNIN( MODE For sel playbac STERE( channel spe

7、aker: NOTE: Recordi MONO, rate. DUPLIC With su two tap onto th operatic For listening at low volume the ON position will boost frequency ranges. The response of the human ear to low and high sound volumes is different. At low volume levels, the ear is relatively insensitive to sounds at either extre

8、me of the frequency scale. By means of the LOUDNESS switch, these sounds are given additional amplification. luutJ FM lillmilillril AM 55 , $ ? , 9 4 , 9 6 , 0 g , 1 0 0 , 1 0 2 i l l i l r l t l | l t l i l l t r I r l i l t t l i l t t l i l t l | i l t r n , t r t t i l i l l i t i l t i l t l Ra

9、dioFans.CN 收音机爱 好者资料库 ii. FM TUNING METER With the needle of the SIGNAL meter deflected to the right, fine-tune FM broadcast by centering needle of TUNING meter. PROGRAM SOURCE INDICATORS Indicate program source selected by means of FUNCTION switch. TUNING KNOB For selection of FM or AM stations. FM

10、 MUTING BUTTON Foi selection of FM broadcasts, button should be in ON (released) position. When button is in ON position, unpleasant interstation noise is suppressed. When signal strength is poor, it may not be possible to bring in the desired station if MUTING is ON. In this case, press button to p

11、lace it in the OFF position. FUNCTION SELECTOR For selection of program source. AM: FM: AM broadcasts FM broadcasts PHONO: Playing records AUX/MIC: For use of component connected at AUX terminals of receiver, or microphones which may be plugged into Mlc jack. NOTE: AUX and MIC program sources cannot

12、 be used simul- taneously. When using AUX hi-fi component, micro- phone should be dbconnected. rc JAcK Accepts standard 6mm plug. Microphone input signal enters both R and L channels. TAPE MONITOR SWITCH 1: For program sources other than tape deck (playback). (REC or PLAY). SOURCE: For program sourc

13、es other than tape deck (playback). 2: For monitoring of playback or record mode of tape deck connected to TAPE 2 terminals (REC or PLAY). NOTE: When not monitoring record or playback mode of a tape dech, switch should be in SOURCE position. In position 1 or 2, the program source indicated by the FU

14、NCTION selector will not be heard through speaher sysfems or headphones. i,1 , , t * ;s- and R ockwise R over lume of rt level. vitch in nd high l sound 3 ear is r of the switch, to*s ueoiwer: ! MODE SWITCH For selection of stereophonic or monophonic mode of playback. In normal operation, switch sho

15、uld be in STEREO position. In the MONO position, R and L channel signals will be mixed, and sounds coming from speakers of both channels will be the same. NOTE: Recording stereophonically with the MODE switch in the MONO position may cause channel separation to deterio- rate. DUPLICATE SWITCH With s

16、witch in ON position, signals recorded on one of two tape decks connected to the receiver may be recorded onto the other, with or without editing. For normal operation, this switch must be in OFF (upper) position. a l i l l l l l l l l l l l r l l l l RadioFans.CN 收音机爱 好者资料库 3. CONNECTION DIAGRAM RE

17、AR VIEW Outdoor FM antenna Center wire -tl mesh 75 ohm coaxial cable indoor or outdoorl k A*ry ANTENNA PLACEMENT Make note ot rhe lollowing ponts when choosing e location for the FM antenna. 300 ohm leeder cable Direction ot signals 1.5 meter (5 ft.) above More than 4 meters (15 ft.) above ground Pl

18、ease see tollowing section, Antenna and Ground Connections, for instructions regarding Fl/1 antenna FM do-rmph6i5 3witch: For normal FM recebtion rhis switch shorrld be set on 75!S (unir is set to rhis when leaving factory). The 25pS setting is used only when listening to FM Dolby* transmissaons. Wh

19、en listening ro FM Dotby transmissions, it wi be necessary lo use an NR adaptor wiich can be purchased separately. More detailed instructions witt be found in the section, ,FM Dotbv Reception. Antenna should not tte placed where it will be subiect to elec- tracal interlerence from motor vehicles. Fi

20、g. I s r L_t 6 E E B E A t r Feeder wire and cSle a Length should b a should be insulated at short as possible. mounting points, a Feeder wire should not b coiled. RadioFans.CN 收音机爱 好者资料库 TOP VIEW six-750 Accessory AC outlets: Switched . Power to this outlet is controtted by the SX-750 powr switch.

21、Whn power to the receiver is On, this oudet will provide AC currenr 10O watts maxamuml. Unslvitchod. Power to this outlet is not controtted by the SX,75O power swilch. As long as the power cord is plugged into a tive outlet, this outlet will supply AC current maximum 300 warts). AC outlts L channel

22、R chr A SPEAKER SYSTEMS L channel m R channel m 0000 0 0 00000000| 0 0 000 000 rt000000000000000000000000000000|0000000 B SPEAKER SYSTEMS Carrridg tape deck Tape deck Fig.2 RadioFans.CN 收音机爱 好者资料库 4. BLOCK DIAGRAM ANTENNA FI1 TSQ FM 300si G N D Af1 IF amp CF . HA12O1 CFHAl 13 ?T410614P Ratio detecfo

23、n SIGNAL meter v l u CONTROL SECTION TAl136P1 TAl 1 36Pi A11 TUNER *,;t-l AMP TA1136Pl ! IlIC AH P c! c! 3 5 Tone control ON I I EQ t- rF ,# rr = U) (./) (-/) p-. a ON OFFI I I I I I I I I = U) IY P = = t-rl o_ g 1 -l I I I I I J 7 I L PHONO R L AUX n K tl lc 0 N 6 . l OFF t, 16ng gQnTfol ON DC POWE

24、R SUPPLY .l ,aF : ; - ;/ AAF.0.l8 Nylon sheet / /- A B c D A B c D RadioFans.CN 收音机爱 好者资料库 11.7 PART VII NOTE: Parts indicated in green type cannot be supplied. Screw 3x8 ABA-057 Although there are some units in the SX-?60 series which do not contain green line encircled cobponents, this is not an e

25、rror. AC power cord ADG-OO5 Strain relief AEC.079 Screw 3x10 ABA.082 r1 ,). I B I I T Screw ABA-OO2 Y T Screw for ground AKE.O17 AC socket (OUTLETS) AKP.OO4 Amplif ier assembly AWK.O65 *# Terminal (antenna) AKA-OO2 A B c D A B c D 43 RadioFans.CN 收音机爱 好者资料库 11.8 PACKING Operati ng i nstructions ARB.

26、174 FM T-type antenna ADH-OO2 six-7Ecl Side pad AHA.112 Packing case AHD-357 (KU model) AHD-358 (KC modell Vinyl bag EI1-O24 RadioFans.CN 收音机爱 好者资料库 I2.SCHEMATIC DIAGRAMS. P. C. BOARD PATTERNS AND PAR1 12.1 SCHEMATIC DIAGRAMS TUNER s AF Assy AwE -0?3 AUX iS,v-l Lctt I soxo I HXo l1 50KO SWITCHES; Sr

27、 FuNclor: Sr | .At1 2 Ft1 3 Pt-roNo 55 + AUX / tltc Sz TAPE MONITOR Ss 1- ffir-2 r, Sr Ss DUPLICATE 9il -orl ,Sa RESISTORS: lN 0Hl1 , I /4 tf , .t 5 7o TORELANCE CAPACITORS : lN,4 F UNLESS GTHERWISE NOTED NOTES : oeTA?l36Pl i ?32tr f100E Ss ,Qf;$!,nt1,:ffi310: r r : ,: ,:,: ,r.$,o,r iouoness I 9!T*

28、ON 3 TONE 4 9E- 0N 5 HIGH FILTER 9!E -oN S FM I,IUTING 0N - OFF UNLESS OTHERW|SE NOTED K : KO P : P F L PHOll0r+ d R !il, 4E VR4 BAl.AilCE COTTRoL L -) ;r VRs $TLUI,IE S)rrRoL .?*-l .l lvRsl RELAY SF,EAI(EB, PO|JER OFF S P A SP OFF S P B SP 6+ 3 OE- EI1PHASIS 5A-13.,uF 2.7K lorrrrl36Pl LeiEl4 LLj E

29、: STGNAL$LTAGE NEcEssARy FoR oBTATNTNG 56vEo ourpur poyvEn ilK Hz) V : 0C V0LTAQE AT N0 TNPUT STGNAL Tz Fll tB l l l l r l RED !l !r ri 1-2-3- 4- 5 6 l 8 9 r|-. on 45 RadioFans.CN 收音机爱 好者资料库 4 RNS AND PARTS LIST P0vfER SUPPLY AS) AWR,- toO l4 31*i._- + o Gnn Tt gR,i qT 406lAP r00K Ei,E AC lzov OU NL

30、 ,.r*l8 * ; porvEn SUPPLY tr PRoTECTIoN ASsy AfR-099 Qs,Or,0e Qs Q5-g1,os 2SCl6+?xs 2sAt2il lslts5 x4 Or 2SCn65 t- #t .-n1 ,h J sro J-ffi iL t_ Q.Qr 25tX0 xe i6- o PLe 0v 5onA rx0 R S o o PLr Ah Pl-s Fm PLs Prom Pl-r AUX 3V 38rA pqlrt0N INOICATOR Ev $nA x+ Ssl rti R.2K - r rr-rr.-*-*niEJffit nm-d.i

31、I I l rtKtt rur crlqfi 0s, Os lSl88Fll xz go,iins T:1l I E-.?-. - JA,S h.Ds lSl0EO x+ 06,ss SR3Afl-Ex+ 44 +3TP 2 *$:,T:fr:r:,rl ,19:l_gtgasrq:s? ; s r o o l r_: _-_ J 33v E or-as2SC945 l RllR 8V 3-lT b, l:;- I slill I srtvl:l ;l ll+,i*iiii +- lrrarpr I so -nrrrrJ Rr 22X :- otI diln onm L R ? ; o o t

32、t*l 550 R.5t( ND sIX Cx 0.0056 o- l N d = S 3 t d o E - z_ d =oa= 6 U J - 6 + _ - g g A r o 9 - 9 1 = ! c, r an d -Eu - S 9: d z ) l. L ! L c- h o ct c, c.l = 7 t S It ; CC Stt, * 9 o ct (J _ ar, 00tr.u dlN 001 r r/) dt a/, GI d d (t r + cl o o = q s d 3 a ( = :S, 6 l f : = _s t (,lS) 9 0 ctu = = =

33、E E 1f, 3 l t A c D A B c D RadioFans.CN 收音机爱 好者资料库 1 I -046 No.2 AWG-0/16 No.7 (_19vlj AWE-073 trto.3a (_19t AwM094 Nol (-tgvlt AwRq AWR-099 No.4 AwG-046 No.8 (21V) AwE-073 No.33 (21V) AwR-100 No.7+- (41v)f 5 * Lo AWR-099 No.l1 RadioFans.CN 收音机爱 好者资料库 I !AWG-046 No.2 AWG-046 No.7 (-19V) AwE-073 No.

34、34 (-19V) AwM-094 No.l (-19V) AWR-099 No.23 -099 No.1 3O-+AWG-046 No.1 cl)(-75Cl to-41vlT+AwE-100 No.6 rs-J 7*, ii i t-AwR.oeeNo.8 tl - . +AWR-099 No.8 o2 (-41V 5El RadioFans.CN 收音机爱 好者资料库 SymbolDsscription Part No. o1 02 o3 a4 o5 o6 o7 08 D1 D2 D3 o4 Transistor Transistor Transistor Transistor Tran

35、sistor Transistor Transistor Transistor Diode Diode Diode Diode 25A798-F 2SA798-F 2SC1438-V 25C1 438-V 25D357-C 25D3s7-C 258527-C 258527-C 152473 152473 STV4H STV4H Parts List of Power Amplifier Assembly (AWH-046) SEMICONDUCTORS SymbolDescription Part No. R34 R35 R36 R37 R38 VR1 vR2 Wire wound 0.5 5

36、W Carbon film 10 %V Carbon film 10 %W Carbon film 10 %W Carbon f ilm 10 %W Semi-f ixed 100-B Semi-f ixed 100-B RTsB OR5K RD%PSF lOOJ RD%PSF lOOJ RD%PS lOOJ RD%PS .IOOJ ACP-019 ACP-o19 RESISTORS SymbolDescription Part No. R1 R2 R3 R4 R5 R6 R7 R8 R9 Rl0 R 1 1 R12 Rl3 R 1 4 R 1 5 R16 Rt7 R18 R19 R20 R2

37、1 R22 R23 R24 R25 R26 R27 R28 R29 R30 R31 R32 R33 Carbon film 2.2k Carbon film 56k Carbon film 56k Carbon film 56k Carbon film 56k Carbon film Carbon film Carbon film Carbon film Carbon film Metal oxide Metal oxide Carbon film Carbon film Carbon film 560 1W 560 1W 560k 560k 2.2k 2.0k 2.Ok 1.8k %w 1.

38、8k %w 1 . 1 k Carbon film 1.1k Carbon film 27k Carbon film 27k Carbon film 3.9k Carbon film 3.9k Carbon film Carbon film Carbon film Carbon film Carbon film 100 100 150 150 150 Carbon film 150 Carbon film 1O Carbon film 10 Carbon f ilm 10 Carbon film 10 Wire wound O.5 Wire wound 0.5 Wire wound 0.5 %

39、w %w %w %w %w %w %w %w 5W 5W 5W RS1 P 561 K RS1 P 561 K RD%PS 56lU RD%PS 564J RD%PS 222J RD%PS 222J RDZnPS 563J RD%PS 563J RD74PS 563J RDy.PS 563J RD%PS 2O2J RD%PS 2O2J RD%PS 182J RD%PS 182J RD%PS 1 12J RDz.PS 112J RD74PS 273J RD4PS 273J RD%PS 392J RDI/.PS 392J RDYIPS 101J RD74PS 101J RD%PSF 151J RD

40、%PSF 151J RD%PSF 151J RD%PSF 151J RD%PSF 1O(U RD%PSF lOOJ RD%PSF lOOJ RD%PSF lOOJ RTSB OR5K RTsB OR5K RTsB ORSK CAPACITORS SymbolDoscription Part No. c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 c1 1 c12 c13 ct4 c1 5 c16 c17 c18 c19 c20 c21 c22 c23 c24 c25 Ef ectrof ytic 1 25V Ef ectrof ytic 1 25V Ceramic 56p 50V

41、 Ceramic 56p sOV Ceramic 12Op sOV Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic l20p 50V 220 6V 220 6V 100 35V 100 35V 15p 50V 15p 50V 220 6V 220 6V 180p 50V 180p 180p 180p 0.04 0.04 50v 50v 50v 5

42、0v 50v Ceramic O.O47 50V Ceramic O.O47 50V Ceramic 560p 50V Ceramic 560p 50V Metallized mylar 1 100V cszA 01 0M 25 cszA 010M 25 ccDsL 560K 50 ccDsL 560K 50 ccDsl 121K 50 ccDSL 121K 50 cEA221P 6 cEA221P 6 cEA 101P 35 cEA 101 P 35 ccDsL 150K 50 ccDsl 150K 50 cEA 221P 6 cEA221P 6 ccDsL 181 K 50 ccDsL 1

43、81 K 50 ccDSL 181 K 50 ccDs|- 181K 50 CKDYF 4032 50 CKDYF 4032 sO CKDYF 473250 CKDYF 473250 CKDYB 561 K 50 CKDYB 561 K 50 ACE-008 OTHERS SymbolDescription Part No, Heat sink AF chock coil 2.21tH Contact strip (3PL-type) ANH-117 T63-009 AKM.O18 57 RadioFans.CN 收音机爱 好者资料库 A B c D 2 2 A B c D 12.7 POWE

44、R SUPPLY t , t t - t ! l FI tI o o For units in which amplifier assembly is used in place of IC (Q9, Q10 = indicated by red line, see Page ?3. (AWK-065) TA7136P) 2 l-_-f crNTER,lrrE*l , i.* L_:J 72 w t; -15-t4_ 13 r? il r0 I t - z - - T a s 6 ? 8 ln2/2s 66 RadioFans.CN 收音机爱 好者资料库 os, D. tstteFr,? I

45、r 33k l l K trUllm Asty AWn - O!t4 f-r +l s, -2R :9 o 43P B r3V 25 fill DU I I3 VCO KItLIR 30 FM SJGNAT NTTTR OII FH SIGNAL IIIIR IN R tui T0 IiNE C0NIROL Assy 0NIRol A$ i Ast/ (Alitl 0,c1) |l fq |o., lux Prm Fl A?1 coir P(NtTtoti unP 16-15-14 13 t2 tr 16 - rs- t4_13 12 | to 9 l - 2 - 3 4 S 5 I 8 .E

46、 !5r L (rb) 66 rl)rr REC, rxtl, mc, not, R CHAIIFT RadioFans.CN 收音机爱 好者资料库 AWG-046 No.8 AWH-046 No.21 -*-.iE- 2s T i- lt.w ;$,:itr i 1.+ft44-, .rff llir#;l ll.H,*-l l;m-:i*t t* al$f-*rJ* | r - - - - - - - - G F - l - rri:1- -jr*5- 1 I I li1l I tlr: p i 3 l o r I I I ttl ibr- 35 36 I-oo 9-:ss-l - *j,

47、.: -r#: f-o - l1=9 .*, f .?ry_- ,r a-c- #,* +ial I o-sg- / llo frFrri,rl I r0 .4 tl b l o q . . q -jl -.zo zFdbivr1;/ cn,os -H:l-.;,; kdh 4ts+ in:,Tmffi c!35tP d F . -l-.iv Lg:- / *:E - :-. -_*. . .1*. /- - itk+y,-#iffio sr9 ,.,u ffi p! ?*ozpff,o,i qtsdFi -jiil- | .-:*- -x;+: flifh. I u,., dF ol | |

48、 * ffr AWM-094 No.1 (-19 AWG-046 No.7 (-19V) AWH_046 No.28 (_19V) AWX-095 No.3 -39 AWX-095 No.l -40 AWX-095 No.2 -41 AWX-095 No.4 -42 TP2+-43 AWM-094 No.2 -44 10 FMI 75o I FMI 300Q I GND I t *-5i.- Er RadioFans.CN 收音机爱 好者资料库 six-7Ecl AWR-099 No.24 (33V) + AWG-046 No.6 AWG-046 No.5 - AWM-094 No.4 tir

49、 l - l l l v R ! ( r l r E l l l r r -af ll -lrc;t.*ffii) RCH - sf/tTcH ts : SI FUNCTION las 2 Ft4 3 PHONO 4 AUX./nlC sz TAPE t10NtT0R 1-0FF- 2 Sr tUPt-tCnre -QE!-0rt $ r100E STERE0- 110N0 i! L f,llc El 50KQ ss L0U.ONESS gff- 0N So T0NE gpF- 0N Sr HIOH FITTER oFF-otl So Fn nUTtNG 0N- oFF S9 RELAY SPEAKER PQWER oFF