Pioneer CT-3, Service Manual

Page 1: ...REclncesu cnNtouEs A J U S T E S M E C A N T C O S 12 ELECTRICAL ADJUSTMENTS R E G L A G E S E L E C T R I O U E S AJUSTES ELELECTRIO I3 BLOCKDIAGRAM I4 CIRCUITDESCRIPTIONS 15 CASSETTE DECKMECHANICAL 24 27 31 J5 39 40 44 OPERATIONS SIMPIFIED DESCRIPTIONI PIGINEEFI ELECTFIE NIC CCtFlttOFlATlClN z1 I Mesu o 1 chome Mesu o k rokyo 1s3 J6p6n u t FICfNEEFI ELECTFICINIC CC FIFC FAIICIN 85 O fo d D rve M...

Page 2: ...ign subject to possible modifications without notie due to improvements NOTES 1 Reference Tapes Normal LH DIN 45513 BLATT6 or equiv CrO DIN 45513 BLATTT CrO l or equiv 2 Reterence Recording Level Meter 0dB indicating level 160 nwb m magnetic level Phillips cassette reference levet 3 ReferenceSignal 333 Hz 4 Wow Flutter JIS 3 kHz with accl rsticcompensarion weighted rms valuel 5 Frequency Response ...

Page 3: ... For right channeladjustments The controls normally rotate together To rotate only one control hold the other so that it will not move Functionswitches REC switch Depressto start the recording operations REWIND switch l Depressto rewind the tape P L A Y s w i t c h Depressto start tape play When using the Music Search MS function operate the PLAY switch and REWIND switch or the FAST FORW ARD switc...

Page 4: ...oval Dooraslembly CounterRemoval Knob INPUT VOLUME NOTE Do not apply unnecessary force to hoohssince this may resultin damage IndicatorPanel Front panel Switch assembly Pushknob DOLBYNR ON DOLBYNR OFF MPXFILTER Fig 3 1 DisassemblY 1 ...

Page 5: ...Removal 1 Gently raise the hook of the front panel with the small screwdriver 2 Pull the counter toward you and remove it Screwdriver Front panel LED cover retaininghooks Switch AssemblyRemoval Remove the two screws MechanismAssemblyRemoval 1 Removethe counter belt and the REC ioint 2 Removethe six screws Meter AssemblyRemoval Remove the hooks E of the front panel and re move the meter assembly In...

Page 6: ...ERALLY MOVES FAS T ERTHAN This classificolion sholl be adjusted by eoch distributor beccuse it depends on model number tetnperature h umid ity etc PushknobK 1DOLBY NR ON DOLBYNR OFF I 4PX FILTER RAC 182 Knob INPUT Rl RAA 358 w d t Door assembly RXX 353 Knob POWER RAC 195 RECMUTE RAC 183 Front View with PanelRemoved Cassette plate RAH 397 Indicator panel RN L 346 K n o b E J E C T R A C 1 8 0 R A C...

Page 7: ...h BonnetRemoved A A Mechanismassembly R Y M 1 1 8 Switch assembly RearPanel View Terminal LINE RKB 18 Power switch 5305 RSA O55 Powertransformer 120V RTT 236 RWX 574 Volumeassembly mu RNT O2O Strain relaef AEC 376 ...

Page 8: ...tte plate Function knob G Function knob H lndicator assembly LED cover Meterassembly Volumeassembly Front panel Ejectspring Ejectplate Knob EJECTI Counter Counterbelt Door Door lens Doorassembly Indicator panel Indicator lens Knob INPUT L Knob INPUT R Knob POWER Powerjoint PushknobL RECMUTEI PushknobH TAPESELECT Motherassembly Powertransformer 120V Strainrelief Mainchassis A 35 36 37 38 39 40 RDG ...

Page 9: ...3 2 A B o 49 l9 I _ C Volumeretaining nut andwasher D 3 2 ...

Page 10: ...6 5 4 A B T 47 C D 6 4 ...

Page 11: ...3 2 99 A U A D h gz 39 I ftA u 4 L N A V 3 lllil B 4 l I s I N A f aa Y KCl tt n W j t I l 3 C T 48 26 D 3 2 r 0 l l ...

Page 12: ...6 5 4 50 110 A 102 B l 15 64 57 t4 I I t g I t I 72 98 91 92 D lt8 6 5 4 4l r06 ry 48 t0l ...

Page 13: ...g Brakeplate Action platespring FF actionplate REW actionplate J o i n t L Joint R Gear lever R Triggerspring R Detector lever Link Stop lever REC actionlever Cam gear R Pauselever Pauseleverspring Flywheel receptacle Motor assembly Leaf switch UL cord clamper Thrust receptacle REC actionplate REC return spring Leverswitch Plate Eject action plate Eiect action spring Side plate R assembly Platesto...

Page 14: ... NO ES c When ordering resistors first conuert resistance ualues into code form as shown in the fo llo wing ex ample s Ex I When there are 2 effectiue digits any digit apart from 0 such as 560 ohm and 47k ohm toleranceis shown by J 5 and K 107o 560c 56 x 10 561 RDY4PS 5 tr 47he 47 x 103 473 RD PS AAJ 0 5e 0R 5 RN2 H Etrl I f l 0 1 0 R s l P O a o K Ex 2 When there are 3 effectiue digits such as in...

Page 15: ...4PM DONJ RDTAPM 8trtr JNL RD74PMtrtrDJ VR101 VR201 Semifixed 22k B VR102 VR2O2 VR301 Semifixed 10k B VR103 V8203Semifixed 150k B R30 1 R31 8 8103 R203 R317 R104 R204 R1 01 R10 2 R 105 R15 8 R2 0 t R202 R205 R258 R302 R303 R305 R315 R319 R322 8336 Symbol Description A A ccDSL 471K50 CEANLIOOM 16 CEARlOM50 CEA R22M50 CEA R33M50 CEA R47M50 cEA O10M50 cEA 10 1M10 cEA 100M16 cEA 220M16 cEA 330M 16 cEA ...

Page 16: ...O89 RTF 084 RTF O85 RTD 026 RTF 057 OTHERS Mark Part No S301 1 S3O1 12 Slide switch REC P BSELECTOR s302 1 S302 4 5303 1 5303 3 Push switch assemblv B TAPE SELECTOR S3O4 Push switch assembly C REC MUTE 5305 Power switch L101 L201 MPX filter L1O2 L2O2 Trap coil L103 L203 Peaking coil 3 9mH L301 OSC coil L302 Line coil Symbol Description RD74PM125J RSG I33 R601 R602 s601 1 S601 2 5603 1 5603 2 Push ...

Page 17: ... 815 25C2240 2SA1015 Type No 2SC1740LN 2SA933LN 2SC2060 2SC2673 2SC2634NC 2SA1127NC 2 2021 2SA937 r m 2sc1383Nc _ u ffit o s N r0 SS l I I iW n l B v t l f 4 rvcer ro J l I n ffi r t ru gil c A 2sD1o31 rvo r rof l s IUy 8A6124 8A336 M5218L HA11226 ...

Page 18: ...E 8 P c 1 BOARD lrl CONNECTION DIAGRAM A INOICATOR Ass y B SWITCHAss y c VOLUME Assty D ...

Page 19: ... 1ii oo i Rtz35 bK g n n l f l t tfo or or rou ron zz a o sDlo31 ii u4 j rr o lll li m t f i r n l 1 2 2 6 I 1 4 1 1 0 F l r t r ffi 1qt l t f ffi T l i i lIL li 8 ii ri j f u luu tilt 7Tfffi 1 n r 1 1 t 466 l i i 3 3st3 i ij _ i fliliii i i i i f Hlo Tn ru ry ffir 3o5 306 3O8 3O9 Q31O l 2 s c t 7 4 0 L N 2 s A 9 3 3 L N Q 3 O Z I o r Z S C t B l s o t S A 3 T I lrii t ur 4 _ lii i Ca n 15 a i 1 r...

Page 20: ...I 8 7 A B C D L I I 7 REDi IOR METER Ass y RWX ...

Page 21: ...M P B v R r o 2 2 O 2 R E C L E V E L A O J R C P 1 4 9 o r R C P D 1 0 r 2 0 1 I K34A or tK6 0102 20 152473or US v R r o 3 r 5 0 t B cttt toogtsoo r L MEIAL t_ tra C O 2 s 3 0 3 3 c r o c i h t 1 1 I o c D 3 2 9 SCHEMATIC DIAGRAM KU AND KC TYPES I L I N E INPUT L l__ NOTE Playbachsignalroute Recordingsignalroute Q3O2 3O3 3O4 2 S C r 7 4 0 L N Q 3 O 3 3 O 4 O S C ...

Page 22: ...T S E L E C T O R M I C L I N E S 2 O 1 I N P U T S E L E C T O R M I C _ L I N E S3Ol REC PB SELECTOR REC PLAYBACK S 3 O 2 T A P E S E L E C T O R N O R M A L H G H S3O3 TAPE SELECIOR cro2 lvlETAL S3O4 J REC IVTUTE ON OFF S 3 O 5 P O W E R O N _ O I I 5 6 0 I D O L B Y N R O N O F F s 6 0 3 r r P x o N o F F The underlinedindicer6 the swatchposition I 6 5 4 R C P f 9 3 f f i Rr3o 6r oi1rb 5 RFctv...

Page 23: ...Eo Y dll lcnv 24ov b i q r t i Ellg sjjey o_ _ i gllFjq____EsY lE l_ J_ _ llE I a i llp I ss LrrEvoLrAGE i l llE i iTet i i gllF I f I _T r I A o 3 r AC POWER CORD R0G O24 a c 2 0 v 220v 2 4 0 V I 5 0 6 o H r I I _ I Mark Symbol Description Part No Remarks KU type KC type D type A A A A A Povvertransformer 12OVl Power transforner l12OV 22OV and 24OV AC cord Line voltage selector socket Fuse 1A Pac...

Page 24: ...l base assembly TU idler or drive arm full assembly Table1 Do notes back tension torque 24 11 3 TAPE SPEEDADJUSTMENT 1 Connect the frequency counter to the LINE OLIIPLI terminals 2 Play back the SkHz portion of the STD 301 test tape At the beginning the frequency should be lie within the 3000H2 30L0Hz range and may be adjusted by turning the semi fixed resistor located in the motor adjust ment hol...

Page 25: ...DE LA VITESSEDE D EF ILEMENTDE LA BA NDE 1 Raccorder le fr6quencemetre aux bomes de sortie LINE OUTPUT 2 Reproduire la partie A 3kHz de la banded essai STD 301 Au d6but la fr6quencedoit sesituer dans la plage de 3000H2 a 3010H2 et ellepeut 6tre r6gl6e en tournant la r6sistanceajustable situ6e dans le trou de rflglage du moteur comme indiqu6 d la figure 11 2 La vitesse de ddfilement de la bande aug...

Page 26: ...te de suministro Modo de reproducci6n 35 55g cm o 2 Sg cm Modo de avance r5pido 70 125g cm r 2 Sg cm Modo de rebobinado 70 125g cm 11 3 AJUSTE DE LA VELOCIDAD DE LA CINTA 1 Conectarel frecuencfmetroa los terminalesde salidade lfnea LINE OUTPUT 2 Reproducir la parte cie SkHz de la cinta de prueba STD 301 Al principio la frecuencia deber6 estar entre 3000H2 3010H2 y podrS ajustarse girando el resist...

Page 27: ...ing with the adjust ment Set the DOLBY NR switch to OFF and TAPE SELECTOR to the NORM position unless directed otherwise Test Equipments ToolsRequired 1 Testtape STD 34LA For playback adjustment STD 608A NORMAL blank tape STD 603 CrOzblanktape STD 604 METALblanktape 2 Audio oscillator 3 AC millivoltmeter AC mV 4 Attenuator 5 Oscilloscope 6 Resistor50k0 47 52kA __ tcf r n l T f I l r o r H Fis12r J...

Page 28: ...to the HIGH position Play back the 333H2 and 6 3kHz portions again and check that the difference between the two output levels does not exceed 2 5dBr1dB NORM posrlron l sdB dB H l G H p o s i t i o n 12 4 PLAYBACKLEVEL ADJUSTMENT Since this adjustmentdeterminesthe DOLBY NR level during playback it shouldbe performedprecisely Setting Mode Playback Test Tape STD 341A 333H2 0dB AC mV meter TP19 L ch ...

Page 29: ... 5dB Next set the TAPE SELECTOR to the METAL position and record the 333H2 signal onto the STD 604 Playback the tape and check that the AC mV meter reads 5 2dBv 0 54V r 1 5dB l33Hz r0dB 3 t 6 m v a Fig 12 7 Recording leveladjustment 3 4 5 M o d e R e c o r d L N E i N p u r Test Tape AC mV meter Input Signal STD 604 STD 608A STD 603 TP19 L ch and TP20 R ch 333H2 10dBv 316mV to LINE INPUT Procedure...

Page 30: ... DOLBY NA ON d B Fig 12 8 Frequency response 4 d B 63 Hz 125Hz 333Hz 125 n2333 H t ks _ Mother Assembly Fig 12 9 Adjustmentpoints FJ VR202 Rchl Recleveladj VR102 Lchl Recleveladj VR3O1 DolbvrNRadi VR1O3 Lchl Overallfreq adl Overall freq adj TP 19 L ch j o TP20 Rch VR1 01 L ch P B leveladj N VR2O1 Rch P B leveladj 30 ...

Page 31: ...r aux r6glages 9 Placerle commutateurDOLBY NR sur OFF et le s6lecteurTAPE SELECTOR sur Ia posrtion NORM saufindication contraire Equipements outi ls d essairequis 1 Banded essai STD 341A Pour Ie reglage de la reproduction STD 608A B ande NORMAL vrerge S TD 603 Bande C ro2 vierge STD 604 Bande METAL vierge 2 OscillateurBF 3 Millivoltmetre altematif mV CA 4 Attenuateur 5 Oscilloscope 6 R6sistance 50...

Page 32: ...iff6rence entre les deux niveaux de sortie n excdde pas 2 5dB tldB ii ll 3 1i i r Position NoRM 12 4 REGLAGE DU NIVEAU DE LECTURE Ce r6glage ddterminant le niveaude DOLBYNR pen dantlalecture il doit6trer6alis6 avec pr6cision P16paration Mode Lecture Banded essai STD 341A 333H2 OdB Millivoltmdtre CA TP19 canal de gauche L et TP20 canalde droite R Proc6dure R6gler VR101 canal de gauche et VR201 cana...

Page 33: ...olt mdtre CA indique 5 2dBv 0 54V 11 5dB 3 4 5 STD 608A Entrde de ligne L I N E I N P U T I Tete P16paration Mode Bande d essai Millivoltmdtre CA 333H lOdBv 3 1 6 m V Enregistrement STD 604 STD 6O8A STD 603 TP19 canal de gauche L et TP20 canalde droite R Signald entr6e 333H2 10dBv 316mV d l entr6ede ligne LINE INPLIT Proc6dure 1 Placerle s6lecteurde bandeTAPE SELECTOR sur la position NORM 2 R6gler...

Page 34: ...d B Fgi 12 8 R6ponse enfr6quence 2 a u I I I t z s H 2 3 3 3 H z t 1 Montageprincipal RCglagede Dolby NR du VR301 L301 R6glage de la fr6quence globale du VR103 canal gauche t qxg I TP19 canalgauche TP2O canaldroit N R6glagedu niveau de reproduction du VR201 canaldroit FJ Rdglagedu niveau d enregistrement du VR102 canalgauche R6glagede la du VR203 canal niveau d enregistrement canaldroitl R6glagedu...

Page 35: ...nterruptor de reducci6n de ruido Dolby DOLBY NR en la posici6nOFF y el selector de cintas TAPE SELECTOR en Ia posici6n NORM a menos de que se diga otra cosa Equipos herramientas de pruebasrequeridos 1 Cinta de prueba STD 341A parael ajustede reproducci6n STD 608A cinta NORMAL en blanco STD 603 cinta CrOz en blanco S TD 604 cintadeMETALen blanco 2 Osciladorsonoro 3 Milivoltfmetro de CA AC mV 4 Aten...

Page 36: ...d8 l sdB 2 Luego poner el selector de cintas TAPE SELECTOR en la posici6n HIGH Repro ducir de nuevo las partes de 333H2 y 6 3kHz y comprobar que la diferencia entre los dos nivelesde salidano excedade 2 5dBt1dB Comprobaci6n delecualizador de repro ducci6n 12 4 AJUSTE DEL NIVEL DE REPRODUC cloN hrerto gue este ajuste determina el nivel del sirtema Dolby durante la reproducci6n deber6 roalizarse con...

Page 37: ...r la cinta y verificar que el milivoltfmetro de CA indique 5 2dBv 0 54V t1 5dB 3 4 5 STD 608A Modo Cinta de prueba Milivoltfmetro de CA Sefralde entrada grabaci6n STD 604 STD 6O8A STD 603 TP19 canal izq yTP20 canalder 333H2 10dBv 316mV a LINE INPUT Procedimiento 1 Ponerel selectorde cintas TAPE SELECTOR en la posici6n NORM 2 Ajustar el control del nivel de entrada INPUT de modo que el milivoltfmet...

Page 38: ... sistema DOLBY Fig 12 8 Respuesta enfrecuencia 2 5dB 4 da l f g 6 2 3 3 3 H z 1 Conjunto principal Fig 12 9 Puntosde ajuste FJ L301 Aiuste del nivel de grab de VR102 canalizq l Ajuste de nivel de grab de VR2O2 canal der Ajuste de frecuencia de VR103 canalizq Ajuste de frecuencia de VR203 canalder Aluste del nivel de reprodrrc de VR101 canalizq Ajustedel sistema Dolby deVR301 v TP19 canalizq A et T...

Page 39: ...s 3 0 t t I OFF O N I I I J E R A S E HE A D r d _ _t s 3 0 r l R E C P B CONTROLCIRCUIT B L A N K D E T E C T O R s30 2 ACr20V 60 H lE L3 s305 I I swrTcHEs S I O I I N P U TS E L E C T o R M I c L t N E SSOl REC PLAYBACKSELECToR REC pLAyBACK S 3 O 2 T A P E S E L E C T O R N O R M A L H I G H S 3 O 3 T A P E S E L E C T O R C r O r M E T A L s 3 0 4 R E C M s 3 0 5 P O W E s 6 0 t 0 0 L B Y s 6 0...

Page 40: ...entiometer and into the recording amp Q106 Signals not pro cessed through the Dolby NR circuit are output from pin 12 of IC301 After frequency response characteristics are adjusted by the equalizer circuit in the recording amp to conform with the type of tape being used the signal is then passed to the recording head When the recording mode is selected S8 goes ON causing B to pass through D3L1 and...

Page 41: ... TO Q106 R E CA M P o STOPmode muting 1 When the mechanism goes into the STOP mode B current is present at 56 and flows through the path R330 R329 turning Q309 ON 2 When Q309 goes ON Q310 also goes ON triggering Q108 and Q109 ON and muting LINE OUTPUT Also as the current passes through D313 and tums Q104 and Q105 ON RECORD mode muting is also effected o STOP REG mode muting 1 When the mechanism go...

Page 42: ...o pin 3 of IC302 The operation of lC3O2 will be coveredlater 3 When the audio signal at pin 3 of IC302 is below the input decision level a pulse is output from pin 8 of IC302 and Q307 goes instantly ON When Q307 goes ON the MS solenoid is activated and the FAST travel mechanism is released by S7 going OFF and the PLAY mode is re entered 4 As S7 goes OFF so does Q306 Q305 goes ON and muting is appl...

Page 43: ... When the power switch is tumed ON or when muting is OFF a fixed time interval reset pulse is generated resetting the internal flip flop circuit and no output pulse is produced 5 P I N I N P U T P R E A M P O U T P U T 6 PIN MUTING RESET F F OUTPUT 2 P I N 8 PIN OUTPUT POWERON MS ON MS ON POWERON 2ilii u segJl i I Capacitor C319 connected to pin 6 servesto prevent the song finder function from unt...

Page 44: ...rts ro tating in the direction CCW and meshes with the capstangear flywheel Capstan gear Fig 15 1 Mechanism in STOPmode Rear View Supply reel base stopper c StopperA t I As the capstan geat and cam gear are now engaged the force transmitted by the motor and flywheel rotate the cam gear further until stopper C makes contact ith gear lever B It stops in that position At this point the capstan gear a...

Page 45: ...lYwheel c rteJer e a ont u O I Action lever Stopper C Gear lever B T PLA Fig 15 2 STOP PLAY operation ldler gear Lever switch PLAY S6 Y button Fig 15 3 PLAY operation tl Projection ifi Brake plate E TU ldler I TU reel base 45 ...

Page 46: ... C r 15 4 PLAY PAUSE OPERATION PAUSE RELEASE Fig 15 5 1 When the PAUSE button is pressed unit in PLAY mode the cam on the PAUSE button moves the pause lever in the direction 2 The pause lever pushes gear lever B up in the 9 direction releasing the cam gear stopper C The cam gear starts rotating in the f direc tion stopping at the point cam gearstopper A makes contact with the pauselever tip 3 The ...

Page 47: ...cam gear R continues rotating until stopper B on cam gearR makescontact with gear lever R stopping it in that position At this time the shape of the cam on cam gear R causesthe REC action lever to move in the t direction pressingon the REC action plate Fig 15 7 The function of the REC action plate is to throw the REC switch and REC PLAY switch to the REC side 3 4 5 T l Pauserelease r F Stopper C A...

Page 48: ...s 15 8 1 When the STOP button is pressedreleasingthe REC button lock the trigger spring R returns the REC connection arm and gear lever R in the U direction breaking contact with stop per B on cam gearR 2 The REC action olate return spring rotates cam gear R in the direction and starts meshing it with the capstan gear 3 Cam gear R continues to rotate until stopper A on cam gear R makes contact wit...

Page 49: ...ode 3 Al the same time gear lever C moves in the Lever switch s7 FASTI MS solenoid lever This direction and the head hse HB lock movesin the ot direction procedurealsoappliesto MS operations Fis 15 9 Joiit R Joint L FF REW MS operation I LeverswitchON Drive arm FF action plate Cam gear REW action plate Lever switch S7 FASTI Sideview FF REWI actionplate o I HB lock lever HB lock lever StopperC Gear...

Page 50: ... previously covered operation cycles when the brake plate is moved in the direction of A the detector lever is pulled in the dilection by the force of the link return spring As the cam gear rotates pin A on the detector lever makes contact with cam A or cam B on the cam gear 2 The cam gear normally turns with motor rotation and with each revolution of the cam g tr the detector lever is moved to a ...

Page 51: ...ii i ii ii iiiij i i ii i i ii I iitii ll Link return spring i i i ri il i1li i Li ii 1 iitl t 9iit u JJ PLAY REC FF or REWbutton Fig 15 13 AUTO STOP operation 15 11TIMINGCHARTS E Y I N P U T nooE HEAD l t F EasE F__F O 0 IEIIF s w lsToP F r ra l S L ID E I P B F aa ao s w I O F F F FAsr fEF l s w I O F F F LINE l oil MUTE IJITF REc l 6N F M U T E I oFF f BrAs o s c I oFF f Ms l oTl T U T E l o F ...

Page 52: ... o F F l Ns fol I X U T E _ L9 it DELAY TITE T 3 2 t n S T a l t n S T loo DS T 6 4 O O6 5 T7 aOO nS f S F R F P S F R S F P P S F T F f I F L I F E T F A A i 9 w3 i8 3 893 I I srl tY rNPUI H D t x I l s TT l or o l sw lsrcFl aa r ffi sLroE sw fF_E_ 6s s17 flII sw LqLl F sr F fotr l f i l L I T E f u t E fnN R E C M U T E ErAs E o5c Lglil M s M U T E l o F FI Tt 4 S T3 25nS T6 8tuS H 9 ...