Pioneer SX-3700 Service Manual Download Page 1 | Manualshive

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Summary of Contents for SX-3700

Page 1: ... a rilf a EefvicecTlanual STEREO RECEIVER sSx 37cIcI sx 8ecl rqoru Err ...

Page 2: ...ITDESCR IPTIONS 4 1 FM Tuner 4 2 AM Tuner 4 3 DisplayCircuit 4 4 Equalizer Amplifier 4 5 ToneControlAmplifier 4 6 P o w e r A m p l i f i e r 4 7 PowerIndicator Circuit 4 8 ProtectionCirorit 5 D I S A S S E M B L Y 6 PARTSLOCATION 2 4 6 8 1 1 1 1 1 1 1 1 1 1 1 3 1 4 1 7 18 1 9 1 9 2 1 za 30 34 J 5 41 7 DIAL CORDSTRINGING 8 ADJUSTMENTS 8 1 FMTuner 8 2 AM Tuner 8 3 ldleCurrent Adiustment 8 4 F LI n ...

Page 3: ... H 2 CaptureRatio AlternateChannel Selectivity o t70 o o7 0 1 5 o 2y o 15 o 25 1 ft8 75dB 4 5 d 8 3 5 d 8 2OHz to lskHz 33dB 65dB 6 5 d 8 9 0 d 8 5 5 d B 50dB 6 5 d B 19 2dBf spv 300 ohmsbalanced 75 ohmsunbalanced A t l kHz 30Hzto l5kHz Frequency Response S p u r i o u s R e s p o n s e R a t i o l m a g e R e s p o n s e R a t i o lF Response Ratio A N 4 S u p p r e s s i o n R a t i o Subcarrier...

Page 4: ...cuit FM STEREOINOICATOR This indicator lights up when receivingan FM stereo program SIGNALINDtcAToR This indicatorlights in sequence from left throughright during the tuning of an AM or FM broadcast in accord ance with the strengthof the signalsbeing received The optimum tuning point is where the maximum numberof indicators light TUNING INDICAToR When tuning in an FM station the optimum reception ...

Page 5: ...e volumeot the rightchannel is higher Turn the balance control to the left andadiust Conversely if the soundappears to be louderon the leJt it meansthat the volume of the left channelis higher Therefore turn the balancecontrol to the right and adjust After adjusting return the mode Fl 4muting switchto STEREO ON MODE FMMUTINGSWITCH This switchisa combinationof the Fl ilmutingswitchand the mode sele...

Page 6: ...3 BLOCK RF Block AM STEREO OUT AF Block DIAGRAM NOICATORIUEE c NAt201 SPEA ERB ll HEAo t r a i BfffiJ G o r REC F AY R C PLAY R CHANNEL SAME AS L CHANNEL ...

Page 7: ...thereby eliminating the generation of unwanted nois or distorition Furthermore sincethe PA4006 A fea tures DC direct oupled switching with the detec six 37ClC tor there is no deterioration in separationat the low frequency end Besides the decoder and muting circuits the PA4006 A also incorporates the pilot signalcancel ler stereo auto selector VCO killer circuit MUT amolifier and MUT control ctcui...

Page 8: ...1 100kHz This DC voltage FM muting signal is applied to the gate of Q2 FET via a Schmitt circuit result ing in the FET being turned on and the quartz lock circuit being tumed off 4 2 AMTUNER The AM tuner stageemploysa 2 ganged tuning capacitor a singleclementceramicfilter an NPN transistor RF amplifier a PNP transistor mixer converter andan NPNtransistorIF amplifier 4 3 DISPLAY CIRCUIT Frequency D...

Page 9: ...ive In addition the AM and FM indicators in the frequency display section are lit according to the Db timing while the kHz and MHz indicators are lit according to the D1 timing MODE st s2 s3 s4 l F M H z H H 10 73 H L H t0 70 H L H H r0 67 L H L 450kHz Table1 TUNI NG Indicator Circuit The TUNING indicator consists of a center tuning indicator which lighLs up when a broad casting station frequency ...

Page 10: ...ncy left hand side detuning direction indicator When either Q16 or Q26 is on the Q14 base voltage will be high resulting in Q14 being turned on and Q18 turned off which means that the center tuning indicator will not be lit up Once the broadcastingfrequency has been tuned properly the voltages on pin nos 2 4 will be equal Consequently Q16 and Q26 will both be turned off which means that neither of...

Page 11: ...utput power indicators feature fluorescent indicator tube FL tube In this tube thermionic emissions from the cathode are ac celerated into the fluorescent substance of the segmentalanodes resulting in the emission of light This tube is used to indicate numerals letters and other symbols An outline of the FL tube drive circuit is shown in Fig 4 9 The output circuit signal is applied to pin no 6 4 o...

Page 12: ...d off and the relay contacts being opened F l y driv circuit Fig 4 10Overload Detector Circu it If for any reason a DC voltage is generated at the output it will be detected by the DC voltage detector circuit resulting in the relay contacts being opened to thereby protect the speakers Rb and C2 form a low passfilter designedto block normal signal components thereby preventing the application of si...

Page 13: ... side of the bonnet case Bottom Plate Remove the eleven screws O to detach the bottom plate Front Panel Remove the all control knobs except push knobs Remove the two screws tp and two nuts Q from the front panel d Fig 5 1 Disassembly n Bonnetcase ottom plate Front panel ...

Page 14: ... 157 The mark found on some component parts indicates the importartce of the safety factor of the part There fore when replacing be sure to use parts of identical designation K n o b T U N I N G AAA065 Bonnet case AMM 89 Leverknob assembly A A D 1 3 9 Function switch assembly AWS 149 Lead out assembly A W V O l 1 lt Variableresistor 25Ok VOLUME ACT 126 Switch LOUDNESS A S K 1 5 7 Switch MUTING ASK...

Page 15: ...OOUT AKB 76 Terminal ANTENN A K A O l 4 Pin iack AKB 63 Top View Power amp protector assembly GWM 159 IPower transformer ATT696 sx 37clcl I AC soctet Ac OUTLETS AKP 39 I AC power cord ADG 23 Terminal SPEAKER AKEO44 Tuner AF assembly GWM 160 Detector assembly GWX463 1 5 n ...

Page 16: ...en take it over pulleys A B and C in that seouence 7 Wind the cord around the dial shaft 3 times 8 Passit over pulley D wind it around the tun ing drum 2 times and finally tie it to the spring hook O so that it is tensioned 9 T rm the dial shaft and check that the cord moves smoothly 10 Cut off any excesscord 11 Tum the dial shaft counter clockwise as far asit will go 12 Align the dial pointer wit...

Page 17: ...n a maximum output level REC terminal 3 Then tune the dial pointer to 90MHz and set the FM SG output frequency to 90MHz 4 Adjust the VC 3 to obtain a maximum out put level REC terminal 5 Repeatsteps1to 4 above 6 Reset the FM SG output level to 20 30d8 and adjust TC7 TC2 and TB at 106MHz and VC 1 and YC Z at 90MHz in the same man ner as described above in steps 1 to 5 These adjustments will ensure ...

Page 18: ...hin 190 to obtain minimum distortion in the demodulated output REC terminal sx 37C C 8 2 AM TUNER Connect the AM SG AM signal generator to the AM antenna terminal via a 1kO resistor o Set the FUNCTION switch to AM 1 Tune the SX 3700 s dial pointer to 600kHz and the AM SG output to 600kHz 100dB modulation 40OHz 3O 2 Adjust the core of T101 to obtain maximun output level REC terminal 3 Then tune to ...

Page 19: ...mode indicated in Table 1 on pageg FM c ramic filt r 0 1 1 412 R 1 21 o k O Op n Blue The jumper between collector and emitter is to be left open R 1 2 1 0 k n Open Orange Th jumper between collector and emitter is to be left open Table2 s 37clCl If the SX 3700 frequency display reads 97 95MH2 or 98 05MH2 when a 98 00MH2 signal is applied to the receiver adjust TC1 so that the display reads98 00MH...

Page 20: ...SA949 rvo No 2SC1885 25C2229 2SA7265 2S8507 25C2291 25K61 3SK73 rype t 45214L P PA3007 A PA4006 A TA7318 A PD5009 2SA913 2SB 834 2SD313 rYPe 2SD8364 2SD880 2SC1913 2SC461 2SC535 2sc1384h lr 1 lfJ rve N6 Lor No i il 1 2SC19l4A s rr LorNo J1l ll tF r hFE lilfl l tl s u l l t t 2SA985A 25C2275A N w ll ill fu i tJt Jt ll Ji ru il i l 2SA1075 25C2525 NJM4558DV HA1201 pPC4558C ni44 W M54451P H A l 2 0 1...

Page 21: ...Y 3 3r t I ffi I t 7 IPLAY 2 I llsmvl I I LPLAY 1 I L C H I K E L Z ft vl I t l L L R E C I r r RECt l F d q I l L n e c z I R C H rH AY 1 I lr5odl I t l L LPLAY 2 o3o1 3O2 M54r4L EO AMP VR3O VIUME acT i26 VRU BALANCE a c T 0 2 t 53I FM MWING MOO ASK r59 I I c5r8 a7e T l l I I i t l st taeE MoNrroR 2 1Y__ POWERAMP PROTECTION Ass y GWM 159 il z E Dl MZ I4O or ...

Page 22: ...13i o t i 0102 2 1K261 E4_99I_A5 LJUv ott _ oto 2sc46t X TALOSC Nt a 6 6ar FM fr oa22 1451P LAR FM IF 8 DET R94 R84 a 3 43O zwr Q5 9 111 24 2SC945A a25 t4 2SA733A O 7 lSt555 o ts2473 R S 100r R62 27k r4 sto IOCKED rysomA I aEL OD t l l J i I t L_ ___1 x x t l I 1 w r I I RtO5 39 _ e 29H Lr I c 2 9 22o _ _ _ l s 5 n ...

Page 23: ...2J 56r R L I R L A Y a s F o 3 3 or5 16 2sA985A Q21 222sgl9t4A a2334 2SC945A o25 2SCr384 05 1O 1S1555 Dli i3 152472 D14 t5 1s2471 Dr6 roE2 o20 Mz 150 c2i6 o9 ro 2sc945a oil 12 2SA949 Qt3 r4 SC275A FL Ass y AWV Ol2 02 3 COMPARATOR A FL DR VE c o 4f 50 02 HArzoto GWM r59 I I rio reo ry oma aEL o75 J _lI i J n I T i l _ _ oa t i 54 FUrcTlOt A S G 2 4 0 Dl 9 151555 FUNCTIONSWITCHAss y AWS 149 ...

Page 24: ... 45 W 8lt output tkH DC voltage V at no input srgnal Value in is DC volrage at rated power mA DC currenl at no input signal 4 O T H E R S r Sign l route A Adjusting point The I mark found on some componenr pans indicates the im podance of the tety f4tor ot the pad Therefore when replcing be are to use pans of identical designation swrTcHEs SI POWER ON_OFF 52 LOUDNESS ON _ OFF 53 FM lvlUTING IMODE ...

Page 25: ... 53o oont Ir tuo cJiJ x Rzrszx 31 30 a ff ff lffilt ry ffi 8fi4 io __ x tr Hffi i s i li IFF q3 riryh _ T 5ri1 uo uu S r F e i e ii g s l Tl l ia 0 ri5 j r uffi i JEifid FrnzrrrTT I gn El l ll l 4_ R 6 a H K lFbl XL lr i_i ti 11 ffi na l i i hilG n l 1 l li 1 o f f l iiirTolll uu j f tffi JFH ffi iro 1 ca P T f 1ot t 55o k e t 6 e crr o tr2 ro r cbtro F r iiil Toliir ttf j L r0 5o330FfE l t 4 o l ...

Page 26: ...z 9 o Rat3 3x 0rl i pr3JX j i jia I oe n io L oll I t2 F ts R3l7 4 7x l F r l lsJ I I dlj I FM MUTTIG r ooE l J g i l t 3 0 e 4 b 3in 33o f f fl klg 3l o32 c R 8 ox R x 1t ffi tuhffiI _n iili6 4 1q3139 4 64 o mo o R3a m C 23 R3rr l0oK o t R32l slx l00x l o o o o o o o o o o L E lg 3L 3 4 6 R rr g v 2 w lw jg IET 1 L 2J tl1 J K 0 2 P O 5 O O 9 READ OUT Ass y AWV I1 P L 9 P H O N O q 6 P A 4 0 0 6 A...

Page 27: ...2 S 0 E 8 0 QrE 258834 or9 o25D836A 1 n a7K 4Qo Ro i l P L A Y 2 L r r j 6 t H c52 oe cto6 022 o r4 e 14 17127 KZL072 Rr 2tI 100 5 R62 4 Drg 1 F ffi 3 zl J ol9 c1 cre cros ih o j4 e t o to n l l9 rdll 3 R p c l K t 4 I Rfi l0 t0 PL7 A M P L 6 F M P L A A U X q d r n c AWV 011 1 F 2 1 fr I o 7 1 n d l b f l n dl lb 0ll I SE 1 n dt tb 1 n ct tF 0t I OFF l ...

Page 28: ...i t Tiffi Rq 620 r i ffi o 9lq 3 c ipg ru flfi S e n a tr ffi t r r 6iT i f ern ffi 1 1 lli f rtl l 1 R or 47 JL L T o b2z ffi 1fl m m fu ffiS 4 ff E200 s I 1ff1 I _ I Til ilo L r iii t ai puiq_ H I K l l m jffiffiffi 5 r t Ef Ru jH t i rL r o l 3 O31 fft ffi Rx7 lxl R G G i o c r o zg z utrr ozr 30 31 ffit if l I t l l t nztrlzt nrt I I 4 1 nao4l r ze 100 35 l l r b l I s 3osseig I l l oI I I I I...

Page 29: ...six 37c Cl c 1 0 o 1 l A C t 2 s V FL Ass y AWV 012 SWITCH Ass y GWS 2331 _____ ___ r t or tA llEP f if iif I P L 1 1 S P B P L l O S P A n P dl tb 0rl I OFF ...

Page 30: ...coil L5 L8 L 10 R F choke coil Fl F3 FM ceramic f ilter F103 AM ceramic filter F4 F5 Low ass filter DetgctorAss y Poweramp ProlectionAss y Switch Ass y FunctionSwitchAss y FL Ass y ASK 159 ASK l57 ATEO39 ATE045 ATB066 ATB 69 T24428 ATF 1O6 ATFO84 ATFO89 CAPACITORS Plrt No l Arr 96 ATB 24 A ELO29 AELO75 l 2sc2525c 25C2525 B A 2sAloTs c 2SA1075 B l A asn soz A AEK 1oo I rer roz AAEK 1o1 AAcGolT CEA4...

Page 31: ... HA1201 2SK61 2SK34 2SC535 2SC461 2SA726S 25K168 I SV69 O3 2 1K261 1S1555 11s2413 MZ 061 wz 061 MZ OA1 wz 081 O T H E R S Symbol Description A K A 0 1 4 AKB 63 PM23OPO4OFMC DetectorAssembly TRANSFORMER T e r m i n a l A N T EN N A P r n i a c k P H O NE Screw GWX 46s Symbol D6scription ATE O5O CAPACITORS T201 FM DET Transformer c92 49 ACP 67 ACT 126 ACT02I RN1 4POrltrDoF RDI 4PMtrNDJ R D 1 2 P SI ...

Page 32: ... Symbol Doscription FunctionswitchAssembly swtTcH Crysial resonator 5 12 MHz Fluorescentindicator tube FR E O UE N C Y Screw AWS 149 Symbol Description ASG240 CAPACITORS S1 Poshswiich Symbol Dsscriprion CEA2R2M sOL RESISTORS c 1 c 2 Symbol Doscription RDI 4PMuLilJ RD l 2PSuirtrJ SEMICONDUCTORS R 1 R 3 R 7 R 8 R9 Symbol Doscription RDl 4PMF UOtrJ i R o t a p t t r r n n t F R 1 4 P M F T l D J RDl ...

Page 33: ...mbly GWM 159 SWITCHES Symbol D scription ASK 157 t ASR033 CAPACITORS Pad No S1 53 Leverswitch R L 1 B e l a y Svmbol D scription ACH 215 ACG 004 CEAR47M5OL cEA 010t 4 50L CEA47OMiOL cEA 470t 4 25L CEA47OM 50L C E A1 0 1 M 5 0 L cEA 221lvt35L CEA221M5OL cEA 331tV1 10L CEAN L lOOM 50 CEAN L 2R2M50 CEAN L 4R7M 50 CEA4R7M50L CEAl OOM 50L CEA22OM 25L C E A1 0 1 M 3 5 L ccDSL 150J50 ccDs L 050D500 ccDsL...

Page 34: ...0 1S2473 KZLl 12 D 1 4 D 1 5 D17 D20 D 1 8 D 1 9 D21 D 5 D 1 0 D22 A KN 30 AKB 063 AKE 44 vaz30Po60F Mc Symbol Description P i n j a c k4 P T e r m i n a l S P E A K E R S Screw 1O PACKING O script ion 1 A D H 0 2 2 ARB 360 4 AHA 252 T type FM antenna Operatinginstructions Side pad ...

Page 35: ...e parI l ltareltna u han replLtcing bc sxre l uy parls ol id 11 col Parts list K6y No Part No Doscription K e y N o P a r tN o Description VBZ3OPO6OF MC 2 ANB883 3 4 ABN 24 5 AAa 239 6 AAD 139 7 AAA 065 8 AAB 239 9 AAD 226 10 DCZ40P150 FZK Screw Front panel assembly N u t Lever knob assembly K n o b K n o b Screw 1 l AMM 089 Bonnet case 1 2 E o t t o m p l a t e 1 3 V A Z 3 0 P 0 6 O F M C S c r e...

Page 36: ...amp wedgetype 8v 300mA Screw Detector assembly Dial panel assembly Lamp holder Shaft cover A N u t Shaft cover B Screw Ceramiccapacitor Switch POWER Switch assembly Screw llou nting plate N u t Internal toothed lock washer Function switch assembly Screw Power transformer Transformer holder Dial shaft assembly Dial scaleholder R Screw AC socket AC OUILETS T e r m i n a l1 P R e s i s t o r h o l d ...

Page 37: ...Interior Components 15 _ 16 L W f f u l eF 6 6 s a1 25 24 23 22 6 g V q ...

Page 38: ...sx s7clcl 4 5 6 38 4 i r 2 n1t r f f i i i Ar A fi 53 2 q l B c fu __ T ry jl fit ffi 4 4 2v s v n6 y i 6 lt f 5 43 5 1 D 5 6 I ...

Page 39: ...pes please refer to the sx 3700 KUtypeservice manual with theexception of thissupplements CONTRASTOF MISCELLANEOUS PARTS Symbol sx 3700 sx 820 AWV 13 AN8 916 ARA375 AHD 782 Front panel assembiy Operating nstructions AWV 12 ANB883 ARB 360 AHD 765 FL assembly Symbol AWV012 MZ O41 AWX013 sz o2l o2 D i o d e ...

Page 40: ...153 J p6n U a PICINEEF lLlC rFlClNlCE CC FIFOFIATIC N 85 Oxfo d Dr ve Moonech e New Jensev O7O74 U S A FlctNlall ELEC TFCINIcI aEtrFtctPE N V Luthagen Have s 2o3o Anrwe p BeIuh PCINaCFI l lelflctNlca AUSIFIALIA PTY LTO 1 78 1 ea Bound6 y Road B ees de V cro 6 31 95 Au6hal 6 ...

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