Pioneer SA-420, Service Manual

Page 1: ...of modefSA 720service manual ART 76S1 Cemanueld instructionserefèreau modede régtage enfrançais Estemanualdeservicio tratadel métododeajusteescritoenespafiol 1 2 3 4 5 6 7 2 3 4 5 6 I 11 Type Voltage Remarks KU 12OV only U S A model s 110V 120V 22OVand2zl0V Switchabtel General export model YP 24OV only Australia model HE 22OVand2r lv Snitchablel Europe model HB 22OY and 240V Switchablel United Kin...

Page 2: ...K DIAGRAM 35 5dB o t I I H tc NJM4558DX R c H S A M E A S L c H l PHONO TUNER AUX VIDEO EQUALIZER AMP POWERAMP Top View Fuse 2 5A AEK 102 Potver transformer ATT 793 A Pushswitch POWER ASG 521 Pushswitch SPEAKERS ASG 266 Hr lr O O c a a t Electrolytic capacitor 4700 35V1 ACH 217 AF assembly GWK 174 Pushsvitch TAPE ADAPTOR LOUDNESSI ASG 285 Rotary slideswitch FUNCTIONI ASE I10 C e a ...

Page 3: ...djust the tone The right one controls treble and the left one controls bass FLAT is the neutral position Turning knob clockwise acctntuates the bass or treble and turning knob counter lockwise attenuates the bassor treble BALANCECONTROL This control should normally be set to center position When the output from the left and right speakersor headphones is not the same adiust by turning the control ...

Page 4: ...el T H D 0 1 1 000H2 P H O N O 1 2 0 m V Output Level T A P E R E C A D A P T O R 1 5 0 m V Speaker A B OFF FrequencyResponse PHONO RIAA Equalization 30Hzto 15 000H210 5d8 TUNER AUX TAPEPLAY ADAPTOR 10Hzto 60 000Hzt3dB ToneControl B A S S t 9 5 d B 1 0 0 H 2 TREBLE È9 5d8 10 000H2 Loudness Contour Volumecontrol setat 40d8 position 8dB 100H2 OdB 10 000H2 Hum andNoise lHF short circuited A network P...

Page 5: ...ssembly Screw 3x12 Pushswitch POWER Screw 4x8 Knob POWERI Screw 3xG Screw 3x6 Nut M9 Screw 3x8 Front panel æsembly Knob BASS TREBLE BALANCE Knob VOLUME FUNCTION Lamp Wire term 8V SOmAl AC socket AC OUTLETS Screw 3x8 21 GWK I74 22 AAD 265 AF assembly Knob SPEAKERS LOUDNESS TAPE ATT 793 AEC 672 ABA 246 ASG 521 VXZ4OPOSOFMC AAD 2EI 11 PMZ30PO60FMC 12 VCZ30P060FMC 13 ABN 024 14 VBZ30P080FMC 15 ANMOo8 ...

Page 6: ...17l8 ACI20v 60Hz ExtcnalAppearance of Transistorc andlGs Type Lot 2S4798 25A850 2SC1735 25B595P 2SD525P HEADPHONES JACK Ass y 55 POWER a a ...

Page 7: ...AF Ass y GWK 174 ...

Page 8: ...3 t lz CONNECTION 6 P C 1 BOARDS DIAG A B ...

Page 9: ...ffi o sr o ilA OlOOldX3 9 ...

Page 10: ... N O H d c e l e u o q d 129 9SV U3MOdl qcrlMs qsnd p 992 9SV V3dSl r lrll t s qsnd LZJ LCV ssvgl rorsrser etqerreA pa ouau leued ql   e luoJj 682 3NV re oc dol e FuBd luorJ tapou uo spuadap 1 asnocaq rotnq r lp r t3 f i i i r il r îî NVHJ AgJSVg sgAow I MgNgc PUD sqrDu aql qlrm papclput arD sraal fulaour lsll aql IorluoJ qrols slrod tnoi tog uotlDuE sap pclluapt to slr d asn ot atns aq Eutcolda...

Page 11: ...C OUTLETSI AC powercord AF assembly ccDSL150K5 x ccDSL151K 500 ccDsL 270J50 ccDsL 680J50 ccDsL101J 50 CCDSL 221Jæ c25 C26 c27 C30 c41 C42 cl9 C20 cl7 C18 c3 c4 AF Assembly GWK 174 CAPACITORS Mark Part No Symbol Dercription CKDYF 4732æ Cl3 C16 C45 C46 C59 CKDYF 103250 C60 C61 RESISTORS NOTE When ordering reeiators conuert the resistance ualue into code form and then rewrtte the part no asbefore Mar...

Page 12: ...B LOUDNESSI Pushswitch SPEAKERS OTHERS Mark Part No Svmbol DeccriPtion VBZ3OPO8OFMC Screw3x8 AKB O77 AKB O78 AKBO79 AKE O47 AEC 078 AKH q 5 ABA 257 l leadphones JackAssembly Terminal PHONES Terminal TAPE ADAPTOR Terminal lNPUT Terminal SPEAKERS lnsulator wafer lnsulator spacer Screw2 5x16 Symbol Dercription Mark No 1 2 3 Part No Description AHA 29O ARB4O5 AHD gO1 Side pad Operating instructions En...

Page 13: ... C H PHONO TUNER AUX VIOEO REC ÎAPE AOAPTOR o o o This is the basic hematic diagram but the ætual cir it mây vary due to improrr mentsin d6ign or PL2 TUI ER st l Sr FUt CÎtOil asE ilo TUNER a rxlvrDEo Pfot o s2 1 PElLq Da ESS ÀsG 28 o3 5 t u 137 A croo o or c Ê5 I iA I t AC POWER CORI AttG o32 FUSE Ass y F u r a s a I AEK IO TI ATT 93 f r ua swrlct ED 200WMAX swrlclrÊo toow Mo PL3 PHOf O eY 5Om A...

Page 14: ... pF I tndication without voltage is sOV except elætrolytic capacitor I J 3 V O L T A G E C U R R E N T l l Signalvoltageat 20 W 20 W 8 oulwt lkHz U DC voltage V at no input signal Value in is DC voltage at rated power fr mA DC current at no input signal 4 OTHERS A Adiustinq point The f1 mark fænd on some æmpon nt pans indicat6 the im ponarc ô of the sfay fâctor of the pan Thecforc when læing be rc...

Page 15: ...Oand TP2 L ch TP4 O and TP3 G of the AF assembly 3 Check that ttre voltage between TP1 and TP2 R ch lies within the DC 2mV 110mV range Then make a similar check for the L ch be tween TP3 and TP4 If the voltage is lessthan 2mV cut jumper A L ch and jumper B R ch If the voltageexceeds110mV check for circuit failure o Bemovethe top cover AF Assembly Æ Jumper A Jumper o o o t e P Êit i È J ...

Page 16: ...tos 2 Conectar un voltfmetro de CC a los terminales similar para el canal Izq entre TPB y TP4 Si la tensiôn es menor de 2 mV cortar la cone xiôn provisional A canal lzq y conectal provisionalmente B canal Der Si la tensiôn àxcede de 110 mV comprobar que no haya ninguna averfa en el circuito Extraerla taPa Conjunto A F ConexiônProvisional A o o o r e e P ______ ...

Page 17: ...P4Q et TP3 d ensembleAF 3 Vérifier que Ia tension entre TPl et TP2 voie droite soit entre 2 mV et 110 mV CC Vérifier de la même manière la voie gauche entre TpB et TP4 Couper I interconnexion A voie gauche et I interconnexion B voie droite si la tension est inférieure a 2 mV Lorsque la tension est supérieure a 110 mV s assurer de I ab sencede pannede circuit Enlever lecouvercle I I Ensemble AF l T...

Page 18: ...sthe KU type U S A model please referto the KU type service manual pp 1 171withthe exceptionof thissupplements SPECIFICATIONS The specificationsfor YP and S types are the sameas the KU type except for followingsections Miscellaneous PowerRequirements Y P t y p e A C 2 4 O V 5 O 6 O H Z Stype AC 11O 12O 22O 240V Switchable 50 60H2 PowerConsumption YP type 150W S t y p e 6 0 W o o o ...

Page 19: ...typ YP type S type AF assembly GWK 174 GWK 176 GWK 177 ELECTRICAL PARTS Mark Symbol Description Part No Remarks KU type YP type S typo A A A A A A A A Â T1 T1 T1 FUl F U 1 s1 S2 c 1 Powertransformer 12OV Powertransformer 24OV Powertransformer 110V 120V 220V 240V1 Fuse 2 5A1 Fuse 1A Push switch POWER LinevoltagÊ selector Ceramic capacitor 0 01 Ac 2s0v AC socket AC OUTLETS AC power cord Screw 3 x 8 ...

Page 20: ...AOAPTOR ac ilo rzov 2æ 24Ot 3ol6oflt AC PO GR COFD ÂDG 046 LII E VOLIAC SELECÎOF a R o3l 220v t20v 21o t llov 93 PO ti asc 320 ra ac220 2 tov m x r ô e I 2A ACilO t2OV AEK I03 L _ _ _ _ J 1r all 793 A lA A ls t lroEz u This is the basic hematic diagram but the ætual ciroil may vary due to improvements in d6ign PL PHor O 9v sODA AEL O75 o o AF Assry s il l sr FultcYroil sE ilo lUTER a  vroEo Pt oi...

Page 21: ...some component pans Indical6 the im o ponance of the safety tactor of the pan Therefore when replacing be re to usepartsof identicaldBignation SWITCHES SI FUNCTION AUX VIOEO_ TUNER PHONO 1 RESTSTORS I Indicated in O W 15 toleranceunlessotherwisenoted k k 2 I M M t l F 1 l G l t 2 K i l O é M 2 O 7 c r o l e r a n c e S2 t 2 TAPE ADAPTOR 52 3 4 LOUONESS S3 I 2 SPEAKERS 53 3 4 SPEAKERS s5 F CWER 56 ...

Page 22: ...L C H R C H PHONO ÏUNER AUX VIOEO REC TAPE AOAPTOR VR2 VOLUME acT t26 TAPE AOAPTOR liSo nvl REC Ridôvl AUX VIDEO Fs Vl TUNER F3o d l PHONO tzsv iR2 t 250r D619 G P 2 0 0 o o This is the basicshematic diagram but the ætual circuil may vary due to improvementsin d6ign PL2 TUilER 8v SOhA AEL O75 5àt ruNER D4 5 MZ 137 FUSE Ass y r i l l Jâa T I ATl 794 _ _ _ _ _ l 8v som AEL O75 ...

Page 23: ...ed p pF I Indication withour volrage is 50V excepr etærrolytic capacilor I J 3 VOLTAGE CURRENT l l Signatvoltageat 20 W 20 w 8l outpul lkHz DC voltage V at no inpur signal Value in is DC voltage at rated power ft mA DC current at no input signal e o 5 3ior A 4 OTHERS Adiustingpoint The A mark found on sme component pans indicatesthe im ponaÉËËof the safery factor ot the pan Theretore when replacin...

Page 24: ...ve the samevalue hfe of 012 Q15 should havethe samevalue A 1oE2 stB01 2l MZ 157 lwz 1571 l cP 2oD SWITCHES Mark Part No s1 s2 A A Rotaryslideswitch FUNCTION Pushswitch TAPE LOUDNESS Pushwvitch SPEAKERSI c3 c4 cl3 C16 C45 C46 C59 c60 c61 Symbol Description RESISTORS NOTE lî hen ordering resistors conuert the resistance ualue into code form and then rewrite the part no asbefore Mark Part No Symbol D...

Page 25: ...r o t z ô I t o s I t3 olo o O l l O i 4 I I ir i 1 ô 1 6 rfrl V Y I I i Ra7 l l s k J ï I I B RD 33O or NJM455a0x 1 I I Q i 5 Îf v qr 2sa850 1 r s o o T Q9 2SCr73s D s2 LOUONESS TÂPE ÂDÀPTOR VOLUME o o 1 1 1 o l t l a 4 f Lts f 2 3 6 I l l ô ôô QI3 2SD525P o r 3 a ît 6 n TP2 T 2Q tge9 T c r a t oo p I I l I I ll Jæ I t æ t I s l FUNC TiON A U X I TUNER i PHONO 3 2 ...

Page 26: ...o A B FuseAssembly for YPtYPe D a a I ojl o o 25P j 02 08 ...