Technics-ST-610-L-Service-Manual电路原理图.pdf

ServlceM zt :RER anL C3uzr,nrZ Synthesizer LW/MW/FM Stereo Tuner SPECIFICATIONS (DrN 45 s00) r FM TUNER SECTIOhI . Frequency range Sensitivity s/N 30 dB s/N 26 dB slN 20 dB tHF 46 dB stereo quieting sensitivity Total harmonic distortlon MONO STEREO 20 Hz-15 kHz, t0.5 dB-1.5 dB Alternate channel selectlvity normal t400 kHz6s dB Capture ratlo 1.0 dB tmage releitlon at 98 MHz 45dB lF reiectlon at 98 MHz 90 dB Spurious respons rejection at 98 MHz 75dB AM suppresslon Stereo separation t fnz 10 kHz Carrier leak 9 kHz 38 kHz Channet balance (250 Hz-6,300 Hz) Limiting point Bandwidth lF ampliier FM demodulator Antenna terminals Tuner s/N Frequency response 87.50-108.00 MHz (50 kHz:step9) 1.5 pV (lHF, usable) 1.3 pV (7so) 1.2 rrV 0sA) 0.e pV (7so) . 28 pvt7so o.15% O.3o/o 70 dB (78 dB, tHR . 65 dB (70 dB, tHR Color (R (s) . BlackType . . SilverType Area r AM TUNER SECTION . . !;r. Frequency range MW 522kHz-1611 kHz (9 kHz-steps) 530 kHz-1620 kHz (10 kltz-steps) LW 155 kHz-353 kHz (9 kHz-steps) 153 kHz-351 kHz (-2 kHz shift) MONO STEREO sensirivity (s/N 20 dB) Mw LW selectivity (+9 kHz) MW (at 999 kHz) LW (at 254 kHz) lmage reiectlon MW (at 999 kHz) LW (at 254 kHz) lF rejectlon MW (at 999 kHz) LW (at 254 kHz) r GENERAL Outputvoltage Power consumptlon Power supply For Great pritain: For others: Dlmensions (WxHxD): Weight: 5T.61OL 20 pV,300 pV/m 50 PV 50 dB s0 dB 40 dB 40 dB 60 dB . 60dB 0.3v(0.6vtHR 9W AC 50 Hzl60 Hz,Z4OV AC 50 HZJ6OHz,220Y 430 x69x290 mm (16t s/r oX 223/sz xl17Aa) 2.4k9 (s.3lb.) s5 dB 40 dB 30 dB -30 dB (-35 dB, tHF) -45 dB (-50 dB, IHF) +1.5 dB 1.21tY 1 80 kHz 1000 kHz . 7SA (unbalanced) Notes: 1. Specifications are subject to change without notice. 2. Weight and dimensions are approximate. 3. Total harmonic distortion is measured by the digital specrum analyzer (H.P. 3045 system). Matsushita Electric lndustrial Go., Lt Central P.O. Box 288, Osaka 530-91, Ja ! ! I t I I I Country Code AreaColor (E)Continental Europe(K) (s) (EB)Great Britain(K) (s) (EnFrance(R Technics r CONTENTS - tl:i. -l- . .:. Page ACCESSOHIES . . .;. . ? CONNECTIONS. .:.2 LOCATTONSOFCONTROLS .3 DISASSEMBLY INSTRUCTIONS . . 4 MEASUREMENTSANDADJUSTMENTS .5,6 DESCRIPTION OF FL PANEL . . . . . 6 FUNCTIONS OF CTERMINALS . . . .,. 7 SCHEMANCDIAGRAM .8-11 r ACCESSORIES oAC power supply cord For EBarea only (SJA193) For others areas (SFDAC05E03) oStereo pin cord . . ; . . . . . . (sJP2276) oFMindoorantnna .:. (ssA270M) I CONNECTIONS Note: An outdoor antenna should be installed by a competent technican only. (Necessary in mounlainous reQions, inside reinorced-concrete buildings. etc.) Stereo connection cable (included) (Necessary in mountainous regions. inside reinorced- concrete builctings, etc.) Use 5 - 12 m (16 - 40 t) o vinyl-covered wire horizontally at the window. TERMINALGUlDE OF IC!S, TRANSISTORS AND DIOOES CIRCUIT BOARDS AND WIRING CONNECTION DIAGRAM . . 12. 13 BLOCKDIAGHAM . 14,15 REPLACEMENTPABTSLIST . . 16-19 EXPLODED VIEW The indlcation AM used here includes both MW and LW. Page 11 rackor.ot . . ttach o . *21l,iusing tack or tape) acingihorection . obest receptiqrt -,. . .: :. _. . : ;., . Tak shoulct ho contact internal antenna wir: r Foi best reception sound quality. an FM outdoor anten-. . :. ,. - na is recommended. . Disconnect this antenna if an FM outdoor antenna is in- stalled. AC power supply cord (included) Household AC oullet .f / / Fit a Suitable plug to the AC power supply cord. To tuner input terminals o the ampliiel l this antenna is not property installed, AM broadcasts will not be received. Be sure to connect the AM loop antenna even when an outdoo antenna is used. 12 m (16 - 40 t.) Vinyl-covered wire (option) -2- I LOCATIONS OF CONTROLS power only. The unit is in the standby condition when this switch is set to the standby cb posilion. Regardless o the switch setling, the primary circuit is always live as long as the power cord is connected to an electrical outlet. Power standby /on (power/r standbY _ This switch switches ON and switch on) oFF the secondary circuit FM stereo indicator (stereo) This indicator automatically illuminates when an FM stereo broadcast is being received. Note: lt will not illuminate i the FM mode selector is set to the monaural mode. The lndlcatlon AM used here lncludes both MW and LW. Band selectors (band) FM: Press this button to listen to an FM broadcast. MW: Press this button to listen to an MW broadcast. allocatlon: This butlon is also used to select a requency step o either 9 kHz or 10 kHz. When the MW button is pressed tor about 4 seconds, the MW requency step will change to 10 kHz pe step. ohis step is set to 9 kHz beore shipment.) Set to the appropriate position ot your locality. ln order lo return to the original requency indica- tion, press this button or about 4 seconds a9ain. LW: Press.this button to listen to an LW broadcast. req shlt: When the LW butlon is pressed or about 4 seconds during reception o an LW broadcast, the LW requency will decrease by 2 kHz. So, or example, to receive 153 kHz tune lo l55 kHz, and then press this button. n order lo return to the original requency indica- tion, press lhis button or aboul 4 seconds again. Digital requency display The reception requency o the FM or AM broadcast selected by using the tuning buttons or the peset-tun- ing butlons is indicated by a digital-type display. Quartz-lock indicator (quartz lock) This indicator illuminates when tuned precisely to an FM or AM station. Memory indicator (El) This indicator illuminates when the memory butlon is pressed. Channel display The channel number seected by the peset tuning buttons is displayed. Signal-strength indicators (signal ) These indicators show the relative strength o broadcast signals being received by the antenna. The best condi- tion or reception, or FM and AM is when the indicators illuminate completely to the right. Tuning buttons (tuning) These buttons are used or tuning to the desired broadcast station. Memory button (memory) This button is used when preset memory setting o the preset-tuning buttons is made. FM mode selector (FM mode) This unit automatically switches into the stereo mode when a steeo broadcasl is received. Press this button lo listen in the monaural mode. The slereo indicator will not illuminate in the monaural mode. Preset-tuning buttons (1-0) (24 channel random presst tuning) These buttons are used to preset FM and AM broadcasl requencies into the memoy o this unit, arrd are also pressed lo select the desired preset requencies. Note: Fleer to page 6 or inormation concerning presel memoy. I DISASSEMB LY INSTRUCTIONS .ATTENTION SERVICER Some chassis components may have sharp edges. Be carefulwhen disassembling and servicing. Ref. No. 1 Removal of the Cabinet He. No. 2 Removal of the Front Panel Procedure 1 Cabinet 6l ,.- ,/ Procedure 1+2 -N- rRemove the 5 screws (O-O). Frontpanel i o 1. Remove 2. Remove the 2 screws (O, O). tlte ront panel in the direction o the arrow. Re. No. 3 Removal of the Operation Switch P.C.B. and LED P.C.B. Re. No. 4 Removal o the Main P.C.B. Procedure 1+2+3 LED Procedlire 1+4 . 1. 2. Remove the 2 connector (eN701, CN702). Remove the 4screws (D:). o T 3. Remove the 4 screws (O-O). 4. Remove the main P.C.B. in the direction of the arrow. Oper P.C.lr,r1| r LED P.C.B. oRemove the 1 screw (Q). I Operation Switch P.C.B. oRemove the 4 screws (O-g). Ref. No. 5 Removal of the FL Drive P.C.B. Procedure 1-+5o 1 2 3 Remove th Remove th Remove th e 2 connector (CN701, CN702). e 3 screws (O-O). e FL drive P.C.B. in the direction of the arrow. FL Drive P.C.B. o Replacement of the Foot. 1. Remove the 4 heat melted posts on the chassis with a pair of nippers or similar tool. 2. To replace the oot (RlG0009-1) on the chassis melt the 4 posts with a soldering iron. Foot (RlG000e-1) I MEASUREMENTS AND ADJUSTMENTS r FM ADJUSTMENT Conlrol porltlonr rnd equlpmenl ured . FM signalgenerator (FM-SG) o Choke coil (100pH) I Stereo modulator . Resistor(100k0) o Distortion analyser o Frequency counter o Oscilloscope o DC electronic voltmeter(EVM) Note: For Z201and7202, they are supplied as adjusted parts. So, do not tum the cores o the parts. FM MONO DISTORTION ADJUSTMENT i.test equipment connection is shown in igure. 2.Set the unit to Fll mode. 3.Set the radio requency display and signal generator to 100.10MH2. 4.Adjust the coreot T2O1 so that the voltage measured in signal mode is OmV (0t20 mV) in 300 mV range. S.Adjust T2O2 so that the distortion factor of L-CH is minimized. 6.Repeat steps 4 and 5. 7.Make sure that the distortion actors o L-CH and R-CH are nearly the same and minimum. Note: The adjusting screwdriver used should be made o resin. MPX VCO ADJUSTMENT 1.Test equipment connection is shown in igure 2.Set the unit to auto position. 3. Set the radlo frequency dlsplay and slgnal genarator to 1fil.l0ilHz 4.Adjust vR30 for 19kHzt3OHz on frequency counter reading. .USING ALTERNATE SYSTEM 1.Apply stereo signal rom generator or receive the stereo broadcast. 2.Adjust VR301 until stereo indicator lights up. Fix the arm o VH301 as shown in figure. FM SIGNAL GENERATOR CONDITION Modulation .100% Modulation frequency .1 kHz Output level .66d8 0c EYra m FI_s6 . Unil l / l lag;l ffi |:T.TJ l,:iifu ili 75o l_a-T7 r_al ;!*_=+=-l; lll llo*o-v l lll-:./; - FM SIGNAL GENEBATOB CONDITION Modulation . .0% Modulation requency .0 kHz Output |eve|. 66dB ,-r*x- g ffi lralffiil ol I hmrolB- l;-*l l- T:91*: looo il l FllAL(7to) lcu.r w ili_:s_:ll -J- -. ) ,o, -, O-O. Storoo OFF posltlon -. Storoo ON posltlon (lndlcator llghtlng) . AdJuot polnt o pllot clrcult fr.s -5- DJUSTMENT POINTS DEsRlPTloN oF GRID ASSIGNMENT AM LooP ANT FM ANT .t! L32 n O UTPUT -l p300O1 p 75Or AMANTI ll oHo / L322 n u r-r , FM FRoNT-END mC 6=rel i-l t-l lo sl I lH z2202ll i6 rEEa I I / rq IET FM offset FL PANEL FLsOl (SAD8MTIOZYK) Note: The grid of 3G and 8G are used for external connection. PIN CONNECTION L324 FM MPX VCO (19 kHz ) h q uartz lock fEl :l ch. -l PINNO.1234567II101112131415161718 CONNECTIONF1F1NPhf8GAMMWCALW7Gca6Gedg5G PIN NO.1920212223242526272829303132333435 CONNECTTONbNP4GNPNP3GNPNPch2GNPu1GLNPF2F2 I FUNCTIONS OF lC TERMINALS gcsor: Lc6s12Asee7) PINNO.IN/OUTMARKDESCRIPTION OF TERMINAL 1INPUTP83Computer drive terminal. 2 OUTPUT DATA Data output ,- I - Xosc CL DATA CE XOSC: Crystal oSC D0-D13: Divided requency data FlO-R2: Reerence requency data 3CL 4CE 5PC3Not usednthisunit 6NCNot usednthis unit. 7OUTPUT . PDO Autolmono changeover terminal. (auto - 0V, mono * 5V) IOUTPUTPD1Computer drive terminal. 9PD2 Not used in this unit.10PD3 11PEO 12 t 14 -22 t 25 OUTPUT PE1 I PE3 PFO t PF3 Digital signal terminat or display. Terminal or key return signal to external key matrix. 15IN PUTRESReset terminal. 16TEST Ground terminal. 17Vss 18 NCNot used in this unit 19 2AINPUToscl Connecting terminal or crystal oscillator. 21OUTPUTosc2 26 I 29 31 I 34 OUTPUT PGO t PG3 PHO t PH3 Segment signal terminal or display. 30NCNot usedlnthisunit 35NCNot used in this unit 36OUTPUT P11Muting signal terminal. (Muting * High level) 37INPUTHOLDTerminal for power failure detection. 38IN PUTINTTerminal for remote control cord. 39IN PUT Voo Power supply terminal of device. Voltage o 5V is supplied during operation of device. 40 IN PUT PAO t PA3 IKEY MATRTXI Terminal or key return signaI to external key matrix. Pin No.4511 tll 10 t4cH.cH3cH2cHt 22cH0cH7cH6cH5 23cH0cH9 21AMFM 25MOOEMMoRYUPoowN 41 44 45 42 a 43 NCNot used in this unit. 46 INPUT PBO I PB.2 Stereo signal terminal. 47SD signal terminal. 48Tuner select terminal. (Ground connectlon) -7 - MAIN CIRCUIT aTSrlxrroBIxr ztol Fx FnoxT Exo Pacx-lnLoooel !_ _ - -esxs+q_ -2s-c2_78M _l l i r p z.? FM lxER l U7Y l0wr 52vl tLO iTSi ozoz l- -*- 0.?v (olo2v u99v lo .vlo2vl OaOl.zoZ ,1 1 ru / 2sc2787LTA L .,- FL lF AXP O2!alv/Dlv. lclo I LM700l PLL FREAUEXCY SYIITHESIZER 2SCt675 I LIL2 I FT B.F i o I AM AN Jrr0 t -2 I It_ tI FM osc -, r I r, . AFI LOOP ANT I J lol. l L oot tloS vtl 560 oro l. toz zSCr740SOSTA Fra LooP FiLER fl oeennloN swrrcH ctRculT 59Ol ill 5904t rfl lv 0v -?2t 5x)9 t9l -J- 2SCr740SOSTA LEO OerVE r9aa tyt o907 2SCt740SOSTA swlcx l to ( NESETI s9t! lLl s9l? llrt I 09tt LxOl la,a 2 r- -! El tt DRrvE crRcurr -B- 2SCr740SOSTA rvlLlr LooP F|LER o 9l or oj l I ;l 1.,. 1 , I 920t hFt I rgoz llgotl rv t; x -16!.ffi, rrG. ?20 r-a I L90l l0lll0lYxl t?, u FM +B LINE o2!t -F 2SA933SORST 4j;.2; lwlLw sYrtcHtMl lzot l rr rr ;j% rctol 11 A irzv _r U LIP C.2:r.lV/01Y. lo-Ilx cE cL ol 2SCr740SOSTA DTCII4YST ,*u,*J9tzcz .!,n Q209 OTA I44ESTP POWEN SUPPLY lF,r /Ll/yvt ,-+ zsclT4ososTA rll-u r 9 EuFFER AxP -sr-* J<i aLW/rWt I al- o;i o DTCIZ4ESTP rl srGNL REcErv El I isz roox 0706 eEt PEo to3 PGI mr EilO LC PCI CE CL onrr Ptl Prz ,/ P82 I fro . P! i- rv sD I r.u F3 _-J-.6y sr rat rat!r! !rlnot o706 DTAII4YSTP POW R SUPPLY - 09t9 6s?9l . i7r6 roo AM +B LlE ; o207 2SCI740SOS TA FOYER gJFP.Y . co l .t t 3ffiffiA -=l oEEco il o2o !l tri :i t ii*l I !1l tc20t tc20r aN72BW fl/ a,rt tF Arf,0E FM ojsat voIfoqr iC.V it - r:r QJQifgfp POF t $fn_Y - : cElo i I I I l _l *;Jii, t-;.-i iltE Ll*. L:oL -.i E : E o 9 0306 rL l3L E60cleLltctllc -9- AF Srgno I c220 l6v1o filol 9 o3or. ro? 25DI45ORSTTA Llol u vl l l vl tswl fu iEL it ro2vl / oztz j/aiiY zsctT4osostrA N Q2I2 AUFFER AxP !rBg. L-J- i ,rl ono I oistortin ooi. ,lx!o1 Lch Rch J, _l Llo2 22rA FM o5e Yoltogc(OmV)odl. -iatv o 70r 2SC3940AQSTA REGU LATOR cTlr loot (21,6v) OTOl rzr.svr :5v ?!.2v FM MPX vCO odi. - -0- .-_s_.r- .,t . .: I I | . .l f SCHEMATIC DIAGRAM (parts rtston pases 16-18) flhis schematic diagram may be riin.a iny iime witn ne development of new tecinology.) Notes: oS701 : Power source switch in ol position. oS901-910: Presettunings,witches. ssot: CHl, 5902: CH2 5903: CH3, 5904: cH4) I ssos, cHS, s9o6: cHs, st7: cH7, sgoo: cHB, I l-ssos, cH9, S91o: cHo ) oS911-S913: Band selector switches. (5911: FM, 5912: MW, 5913: LW) oS914: Memory setswitch. oS915: FM mods selector switch. S916, S917: Tuning sritches. (S916: down,5917: UP) olndicated voltage values are the standard values for the unit measured by the oC electronic crcuit tester (high-impedance) with the chasss taken as standard. Therefore, there may exist some erorc in the voltage volues, depending on the intemal impedance othe DC cirilittester. ( ): AM voltage,-i: MUTINGvoltage . - Positive vollage lins5 .- Negative voltage line ctrtrtrD FM OSC rrrr) AMOSCr+ AM signal .:r*a_$ J.LlFi.r o9-lo -rt 40i -1 4l r rlrl r -t t2 s905 o (3r if s907 b (zr s908 o tet q o9t r ll t4 s909 b (st o s9lo b (ot d 09t2 t- ?3 s9r r bxFMrds sgrs I 2a oo.Nl s9r7 b (uP) N ,.1t- Il rEsT vtJ - -ji-ft-;- -t l4 r il ) I : I -N7273w trEt FMIAM tF AMq oET aN7470 lEttr FM MPX r-