Akai-GX230-tape-sm维修电路原理图.pdf

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1、I$nUEEillAilljALPAHT$LilSTruAKAI STEFIEC TAPE trIEGMG.ELGlX-?3cltrIALScl APLICAEILE TtrI McltrlEL GX-E3clRadioFans.CN 收音机爱 好者资料库ISTtrREO TAPE DECI(IODEL GX.23OD,LSO .PPLICABLE TO IODEL GX.30SECTION I SERVICE MANUALSECTION PARTS LISTSECTION 3 SCHEMATICDIAGRA .I23.tlRadioFans.CN 收音机爱 好者资料库ISECTION ISE

2、trIVICE MAIITJALTABLE OF CONTETSI SPECIFICATIONSII. DISINTLING OF UNITIII. .RR-,NGENENT OF TAIN PARTSIV. fECHANISN ADJUSTIIIENTI. .DJUSTf ENT OF PINCH HEEL PRESSURE. BRAKE TENSION ADJUSTIENT3. .DJUSTENT OF REEL TABLE HEIGHT.I. .DJUSTIvENT oF CAPSTAN oToR SHAFT LooSE PL.Y.i. .DJUSTIENT OF II,IPEDANCE

3、 ROLLER SHAFT LOOSE PLAY ,6. HEIGHT .DJUSTMENT OF TAPE GUIDE ON TENSION .RM: .DJUSTIENT OF TENSION ARN f ICROSWITCH SW-9 POSITION . .8. .DJUSTIENT OF RECORDING SLIDE SWITCH (SW-IO) TIING.9. .DJUSTillENT oF FF MICRoSwITCH (SW.-s) .CTUAToR PoSITION10. .DJUST ENT oF PLAY ilcRoswtrcH (sw-r nd SW-il r.CT

4、IVATOR POSITION. HEAD .DJUSTENTVI. .IPLIFIER SYSTEM ADJUSTIIENTI POER SUPPLY VOLTAGE ADJUST,ENT:. TPE SPEED ADJUSTNENT .3 RECORDING. PLAYBACK AMPLIFIER .DJUSTIENTVII. D.C. RESISTANCE OF VARIOUS COILSVIII. CLASSIFICATION OF VARIOUS P.C. BOARDSI. P C. BOARD INTERCIIANGE,BILITY CIIART COIPOSITE VIEWS O

5、F (OIPONETS:r.i ir:lc.idJusincnts. ntc.lsLlnng ntetltods. lnd opc:-,l:ltg prlltelDics. rcfer lt.r(;EER.L OPER. f IN(; IRINCIPI-ES .D ,I)JLS fIENTSl-t677l99t0l0illlt2lz3l5t5t5l6l7l7l7l8RadioFans.CN 收音机爱 好者资料库II. SPECIFICATIONSAn astersk next to a figure indicates the minimum guaranteed performance.TR

6、ACK SYSTEMi 4 track 2 channei stereo svstemTAPE SPEED7-ll2 and 3-314 ips. x0.7%*l-ll2 ips. (19 crn/sec.) xl.Mo*3-3l4 ips. (9.5 cmlLess than 0.07% RMS. at 7-ll2iPs.Less than 0.i% RMS. at 3-3/4 ips.*Less than 0.l0Vo at 7-Il2 iPs. FWD*Less than 0.I2% atl-ll2 ips. REV* Less than 0.15% at 3-3 4 ips. FWD*

7、Less than 0.l8Vo at 3-3/4 iPs. REV*Less than 0J2% at 7-ll2 ips.*Less than 0.I8% at 3-314 ips.30 to 23,000 Hz t3 dB at 7-ll2 ips. lwith Akai LN Tapel30 to 19,000 Hz t3 dB at 3-314 ips. (with Akai LN Tape)30 to 22.000 Hz t3 dB at 7-ll2 ips.30 to 18.000 Hz t3 dB at3-314 iLess than 1.07oLess than 1.5% a

8、t 7-ll2 ips.WOW & FLUTTERTOTAL WOW & FLUTTERFREQUENCY RESPONSEDISTORTIONTOTAL DISTORTIONLess than 25% at 3-314 iSiN RATIOBetter than 54 dB*Better than 50 dBTOTAL S/N RATIO*Better than 45 dBOUTPUTLINE 0.775V (0 t I dB/O t 1.5 dB. FWD/REV)DIN700 Hz 0 VU Prerecorded tape, output volume maximum0.5vINPUT

9、MICLINEDINf ore than 0.3 mVMore than 70 mVMore than 3 mVRECORDING/PLAYBACK LEVELCROSS TALKERASE RATIORECORDING BIAS FREQUENCYBTAS LEAKHIGH FREQUENCY DEVIATION(at 0 VU output, recording volume maximum),0.775V (0 t 1.5 dB)Better than 40 dB(1,000 Hz +3 VU recordiBetter than 70 dB(1,000 Hz +3 VU recordi

10、ng)100 t 10 kHzBetter than -30 dBWithin 3 dB(8,000 Hz. 3-314 ipt. ta90 minutes. stereo recording, using a 1,800 ft. tape at 7-ll2 ipsRECORDING TIMEFAST FORWARD AND REWIND TIMEApproxrmately 120 seconds, using a 1.800 ft. tape 1!9 FIz.IOTORMAIN MOTORREEL IOTOR2 speed A.C. Servo Conuol Outer Rotor Moto

11、rType: SCM2-24K1,4 poleRevolutions: 6 l5 r.p.m. at 7Ll2 ips.(19 cm/sec.)307.5 r.p.m. at 3-314 iPs.(9.5 cmisec.)Two 6-pole eddy current Outer Rotor MotorsType: 24XGMRRevolutions: 930 r.p.m. at 50 HzHEAD COMBINATION RECORDING/ERASE HEAD| 1,120 r.p.m. at 60 HzType: RE4-6Gap: Rec: 4Erase: Double GaPlmpe

12、dance:Rec: i,400 ohmt25% at 100 kHzErase: 130 ohm t7% at lO0klzD.C. Resistance: Rec: 5.5 ohmErase: 1.8 ohmType: P4-202Gap: 1.7r t0.51Impedance: 1,400 ohm at I kHzD.C. Resistance: 268 ohmPLAYBACK HEADRadioFans.CN 收音机爱 好者资料库ITRANSISTOR2SA564(PXQ) . . i2SC4s8LG(C).162SC945(PXO. . . 202SC1247A. I2SD361(

13、DXE).12SD361(DlXD2).1TlP48. . . 1DIODE1N34A.210D05.4toDl . I10D2.+15-1588. 1ls-2473VE. rRD-sA(M).1582.1(GX-230only)1 0 D 4 . . . 5STK-015 . . .2 (GX-230 only)POWER SUPPLY AND POWER CONSUMPTION100 to 240V A.C. 50/60 Hz, 90W Universal Models240V A.C. 50 Hz, 90W BSI Models220V A.C. 50 Hz. 90W CEE Model

14、sl20V A.C. 60H2,90W CSA Models100V A.C. 50/60 Hz. 60/65W JPN ModelsRecorderTvoe: l20WDIMENSIONS441(W) x 404(H) x 210(D)mm(l7.4x15.9x8.3)Dimensions include ailGX-230D 15.2 ks (33.4 lbs.)cX-230 16.7 ks (36.7 lbs.)NOTES: l. Specificaons determined with Scotch #2ll tape unless otherwise noted.2. Specifi

15、cations Subject to change without notice.RadioFans.CN 收音机爱 好者资料库III. DISMANTLING OF UNITIn case of trouble, etc. necessitating ciisassembly, piease disassemble in the order shown rn photoeraphs. Reassemblein reverse order.HEAD COVER: : Ft t=t rftsf -oII O-OffiESCREvjS : iuBBER -,tlOT iCONTROL KNOBSO

16、O-RONT FELDg t ,- lIIoNCH ROLLPIER CAPADJU-S-:If NTRadioFans.CN 收音机爱 好者资料库TCNNECTION PLUGSffi - t lqffi_ . J * i: ? . i- -: - f - - -:.RE,VSAfvlP BLOCKRadioFans.CN 收音机爱 好者资料库IIII. ARRANGEMENTOF MAIN PARTSFAST 2:ssiMELYTENSICN S iV9KEY SUTTCNELOCKU5E : t LEFT REEL MOTORPOWER TRANSFORMERPOWER SPPLY PC

17、.30ARD lY- 2037s ,r6E, t t =3-GFi,rlf-g-HEAOBLOCKaRIGHT REEL MOTOR:ERVO :CNTROL EC.3OARD MY- 2C36: t v c , / ?i F S W 5VAIN MOTCR?EC, SW, P CBOARD MY-2044-sc. I i5c. a4P oc,SOARD lt1 r-:-6/B1-!Itt#-=-.1t-RadioFans.CN 收音机爱 好者资料库TIV. MECHANISM ADJUSTMENT-BRAKE LEVER BBRAKE LEVER A-_-l8Oo-.SOLENOI DFIX

18、ATION SCREWSAT STOP MOOE F iq,2I. ADJUSTN ENT OF PINCH 1VHEEL PRES-SURE (Refer to Figs. I and 2)I ) Unfasten Microswitch (SW4) Activation Adjust-ment Screws C and C.2) At play mode, confirm that Brake Lever A andBrake Lever B are placed at a 180 angle inrelation to each other. If necessary, adjust t

19、heangle by changrng Play Solenoid (SL-l) position.3) Adjust prnch wheel pressure to 1.5 t0.l kgr-cm byre-positioning Plate A and Angie B.SCREW C -SCREWCAPSTAN SHAFTPINCH WHEEL4) Then, at stop mode. fasten screws C and C so thatthe clearance between the body of MicroswitchSW4 (with time delay) and th

20、e actuator of themicroswitch is approximately 0.5 mm as shown inFig. 2.X O5mmSPRING -Jsw-4RadioFans.CN 收音机爱 好者资料库ISOmm-BRAKE BAND SUSPENSION METALBRAKE BAND .2. BRAKE TENSION ADJUSTMENT (Refer toFigs. 3 and 4)l) As shown in Fig. 3, use a 60mm diameter tapewound on a 5 reel and set both left and righ

21、tbrake tension to approximately 350 gr-cm.Deviation of left and right tension must be within50 gr-cm.2) Brake tension can be adjusted by changing posi-tion of the Suspended Spring. If necessary, changeFig.3METALX Confirm thot boih orecorplloly soporotedFig.4the position of the Spring Suspension Meta

22、l orreplace the spring.3) At all modes except stop mode, confirm thatneither of the brake bands touch the cloth tapearound the brake drums.ERAKE DRUMAvRadioFans.CN 收音机爱 好者资料库TREEL TABLE F|XATION SCREWS,Ittt;/ E E L I A E L E -MAIN MOTOR- IHRUST SUPPORT ANGLEFig. 53.ADJUSTENT OF REEL TABLE HEIGHT(Ref

23、er to Fig. 5)I ) Properil load a tape and move the reei table asindicared by the arrow mak in Fig. 5.2) Fasten Reel Table Fixation Screws to maintainoptimum position at F. FWD and RWD modes.NOTE: Tape should wind on center of reel resard-less of type reel used.4. ADJUSTMENT OF CAPSTAN MOTORSHAFT LOO

24、SE PLAYAs shown in Fig. 6, adjust the loose piav by insertingan adjustment washer (U type) to obtain a 0.3 to0.5 mm degree of loose play when the capstan shaft ismoved by hand.RadioFans.CN 收音机爱 好者资料库tXO.l to O.3nmFig. 7l=_1_IAPE GUTDE, i-i tTENSION ARMA&JUSTMENTlfl:,i: lTaslightly 5. ADJUSTMENT OF I

25、MPEDANCE ROLLERSHAFT LOOSE PLAY (Refer to Fig. 7)Adjust by tuming adjustment screws A and B toobtain a 0.1 to 0.3 mm degree loose play when theshaft is moved bv hand.NOTE: Both A and B screws must be tiehtened afterthis procedure.6. HEIGHT ADJUSTMENT OF TAPE GUIDEON TENSION ARMAdjust the height of T

26、ape Guide on Tension Arm byinserting an adjustment washer (U type) as shown inFig. 8 so that tape travels on the center of the tapeeuide.ADJUSTMENTWASHER(U TYPE)XLff fh gudoslighl lyFig. 8l0RadioFans.CN 收音机爱 好者资料库ISwitch Potifor mtcroswt?ci-y6pg SWTTCH SWg(TENSION SW, )Fig.9SLIDE SWITCH.ICTIVATOR AN

27、GLEX Bend lhls Port rINTERLOCKSPR I NGREC. PUSH EUTTONX lncluding bocko I lowonce7. ADJUSTMENT OF TENSION ARM MICRO-SWTTCH SW-g POSITIONContirm that the microswitch operates at the positionindicated in Fig. 9. If necessary, move the micro-switch to obtain optimum position.8. ADJUSTMENT OF RECORDING

28、SLIDESWITCH (SW.IO) TIMINGfu strown in Fig. 10. adjust the switch timing bybending the slide Switch Activator Angie so that theslide switch slider just comes in contact with the backpart of the slide switch.At this time. the REC Push Button is fully depressed.SLIDE SWITCH SLIOERx.Just contoclsSACK P

29、ARTFig. l0llRadioFans.CN 收音机爱 好者资料库IF E MICRO SWITCH( s w - 5 )9. ADJUSTMENT OF FF TCROSIVITCH(SW.s ) ACTUATOR POSITIONAt stop mode. move the microswitch actuator on FFSlide Plate so that the clearance between the acruatorand the body of the microswitch is approximately0.3 mm or just comes in contac

30、t as shown in Fig. I l.SWITCH LEVERI O. ADJUSTMENT OF PLAY MICROSWITCH(SW-7 and SW-l I ) ACTIVATOR POSITIONAs shown in Fig. 12, at stop mode, move themicroswitch activators on Play Slide Plate so that theclearance between the activator and the porches ofthe microswitches is approximately 1.0 mm.T2Ra

31、dioFans.CN 收音机爱 好者资料库V. HEAD ADJUSTMENT*o,o, ,0,r,-qFig. l3REV. PLAYBACKHEAO P4-2O2NOTES:I ) As perfect head adjustmenrs are vitai in attainingtop tape deck perforrnance. piease be sure thatthese adjustments are properiy carried out.2) Be careful not to use a magnetized screw driver orother magnetiz

32、ed tools in the vicinity of the heads.3) Use only new tape as level variation is likely tooccur when using old tape.4) Demagnetize heads with a Head Demagnetizerbefore and after head adjusrment.COMB(REC./ERASE) FWD. PLAYBACKHEAD RE4-6 HEAD P4-2O213RadioFans.CN 收音机爱 好者资料库A.ljustmentItemCombination He

33、adHeight AdjustmentTest TaoeSuppiv SignaloptionaiAdjustmentPoint(AX B)(C)RemarksUpper edge of ch. I head core and theupper edge of the tape are the sameheight.rWD Plavback HeadHeieht .,diustmentoptionai(DXEXF)Upper edge of ch. t head core and theupper edge of the tape are the sameheight.REV Plavback

34、 HeadHeight AdjusrmentoptlonalREV(GXHXI)Lower edge of ch. i head core and thelower edge of the tape are the sameheieht.IrWD Plavback HeadAzimuth AlignmentAdiustment8.000 Hz.3-3l4 ipstest taDe( F ) |IIIMaximum output. both channels.FWD Plavback HeadGap AlignmentAdiustment8,000 Hz.3-3/4 ipstest tapeAd

35、just head gap surface so that there isno change in output level when tensionis applied to the suopiy reel side.REV Plrvback HeadAzrmuth Alignment.djustment8,000 Hz.3-3/4 ipstest taDeIlaximum output. both channelsREV Plavback HeadGap AlignmentAdjustment I8,000 Hz,3-314 ipstest tapeREV(K)Adjust head g

36、ap surtace so that there isno change in output level when tensionis applied to the supply reei side.Combination HeadAzrmuth AlignmentAdjustmentCombination HeadGap AlignmentAdjustmentScotch ;211 tape15,000 Hz-20 dBmScotch =21I tape15,000 Hz-20 dBm(L)Maximum output. both channeis.Adjust head gap surfa

37、ce so that there isno change in output level when tensionis applied to the supply reel side.NOTE: Set tape speed to 7-l/2 ips. when making ali alignment adjustments.L4RadioFans.CN 收音机爱 好者资料库VI. AMPLIFIER SYSTEM ADJUSTMENT1. POWER SUPPLY VOLTAGE ADJUSTMENT2. TAPE SPEED ADJUSTIENTJffit,-l-|,l,*i=-lI F

38、I L r -rr! |1:) OG/-|ry.I-I:l I _ffiffRiltIGT_i| gcm /3cc.VR I IOKE. a t l K 8,:CJUST TO 24VFig. 14Test Tape1.000 Hz. 7-Il2 ipstest tapei9 cm/s!c Il - 9 5 c m / s c :Fis. l5Ii RemaksI3 eResult24.0VTerminal , Po*tSupply P.C. BoadTape Speed 7-ll2 ips.ModeSTOPFWDP.B.Adjustment ItemPower SupplyVoltase A

39、diustment7-ll2 ips.Tape SpeedAdjustmentt. ,r.fi3-3/4 ips.Tape SpeedAdjustmenti,000 Hz. 7-ll2 ips.test tapeFWDI p.IVR2 30 kB 500 Hz xlj%Tape Speed 3-3/4 ips.r5RadioFans.CN 收音机爱 好者资料库3. RECORDING. PLAYBACK AMPLIFIER ADJUSTMENTVR2D20K8w,R I vR3 /R3b VRrbSOKB 2KE 2K8 3CKBa ,a,av) V) lU -/A.9 .V_ t _ ( h

40、3OP iOP*/L I23mHAdjustmenttvv ftz, t-Ll tps.O VIJ test tapei vR32kBiAdjustment ItemTest TapeSupply SignalModeAdjustmentPointResultRemaksPlayback LevelAdjustment700 Hz, 7-Il2 ips.test tapeFWDP.B.VRl 50 KB0 rl.0 dB(0.77sv)within 0 t1.5 dB atrsverse playbackVU Meter Sensitivity I 700 Hz.7-l12 iFWDRecor

41、ding LevelAdiustmentFrequency ResponseAdjustmentScotch #21 I tape.1,000 Hz O rUrecordingScotch #21 I tape,1,000 Hz, 10,000 Hz-20 dBm recordinsvR2 20 kBc25 80PI tt23mH0 tl.5 dB(0.77sv)1,000 Hz to10.000 Hz flatLess than-30 wRECMonitor Switch atSOURCEReadjust recording levelfollowing bias adjustmentWit

42、h Monitor Switch at TAPEand SOURCE Positions.Bias LeakAdiustrnentRECNOTES:l. Tape Speed at 7-Il2 ips. (19 cm/sec.)2. Tape Selector at LOW NOISE.3. Output volume maximum.4. Nerv test tape should be used.5. The letter b following an adjstment puts numberindicates right channel.r6RadioFans.CN 收音机爱 好者资料

43、库VII. D.C. RESISTANCE OF VARIOUS COILSPartDesisnationD.C. Resistancefain MotorSCM2.4KJBetween BLU-RED 100 ohmBetween YLW-GRN 180 ohmPick-up Coil 635 ohmReel Motor4XO-MRBetween BLU-RED 74 otunBetween YLW-GRN 166 ohmPlav Solenoid1660 THT3685 ohmShut-Off Solenoid0730 THTl15 ohm tlj%RelayMY44-US-ADA DC2

44、4V650 ohmRelayMTS.2980 ohmHead phoneOutput TransformerN16-53sSPrimary 565 ohm !15%Secondarv 0.95 ohm xIS%Oscillator CoilPlavback HeadoT-204P4-202Bereenl-3 0.3ohmBetween4- 6 0.7ohmBetween7-9 %+ffi168 ohmCombinationRec.;Erase HeadRE4Rec.5.5 ohmErase 1.8 ohmNOTE: Resistance values shown in this chart a

45、re averase values.VIII. CLASSIFICATION OF VARIOUS P.C. BOARDSI. P.C. BOARD TNTERCHANGEABILITY CHARTP.C. BoardGX-230DGX-230Relay P.C. BoardMY008MY008Servo Control P.C. BoardMY-2036MY-2036Power Suppiy P.C. BoardMY-2037MY-2037REC. SW. P.C. BoardMY-204MY-2044Transistor P.C. BoardMY-2054MY-2054Equalizer

46、P.C. BoardMY.5O I4 A.BMY.sOI4A.BLamp P.C. BoardMY-501sMY-501sOSC. and Recording Amp. P.C. BoardMY-5016MY-50r6Playback Amp. P.C. BoardMY-5017*MY-s017*Main Amp. P.C. BoardMS-5024NOTE: Asterisk mark indicates not interchanseablet7RadioFans.CN 收音机爱 好者资料库2. COMPOSITE VIEWS OF COMPONENTS1. OSC. and Record

47、ing Amp. P.C. Board O4y-5016)-i:a:*-;*;ri- | ?. i?.:-:=:=tb1 -lb+Jir Fl .Fi.,*r i + r, i- ul , + rEF*rT l ;,BJ F F ; *1, ,: *J .&I A! - I - 1;. ;, ril.t J - . . i, I *qf t llfl, lff119k-d-.,: *,.*q 3, ;i9;i;i.s S.*r,t;a.,b s;SsElj $.tElEn!EK;ie ; i ffigKlry,$: ;i ffi#;r3*. * ffipE-qti ull .*l.tFxql?

48、 - a a I O a a a r - r a a - . r- t ? tf ? I lt f -*Il Qffr . : f l , t , -:*lc:sl* :*!r, e .*lffii.g ; t;!-1,?,f r- a iffi,l#$Lifi ffifi#*Fffi*.;a _ g3l.r;. fi :i. #,*.F*+t+ i; i#tht5$,5+*f; g;llNi;, : l t , !: ts | s ttffifu- ii i;llr: Nfftq .$fntq-iItrllr* t*, r:isli.ffidt*, 11 tr*riirffffffil8Ra

49、dioFans.CN 收音机爱 好者资料库l. Plavback .mp. P.C. Board (MY5017).,-f:=fiF:iE:-b icl4IIIrl-=lIt I r i i, .ll, I!ortt&*/do G-t Er Sfnffil I 7 1 . I ; L + G d C / :. rrlt.* i- =+.=lf iif3ar:ti.*r.I-q$i$ l.-Tpt*f3l s&i. i :19RadioFans.CN 收音机爱 好者资料库 r! o I = -a . -=: ; - r cz *i9ffi*fFt.FCF,r:;of:6 : ,a -;e , l

50、 :=i:i ul iIic,=Tc)DCNCo)-tmIzIOx-c;x=till:l l l lr r t lg3 :o ;t ) z oa)- l oO -D m! D or N ilti 9ll t.F.ll ilr llli 1 1! I-=:a- tS f rN-LOCK J9-: REC !AiP lND. IoatffiSsTT tNC.2.20RadioFans.CN 收音机爱 好者资料库- f A o E Q p q ieoM PtcK ,P -.: - -colL oF VAIN rcfoR -LECTOR swlz I- -dRt o z 693o-HFaFz3f-l