Akai-AJW315CD-cs-adj 电路图 维修手册.pdf
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1、4)NOAUDIO 2.7S _r/v / f Q F “ ,_I 1* r ADJUSTMENT 0INSTRUMENTSANDTOOLS Noaudio 1.AMSTANDARDSIGNALGENERATOR 2.FMSTANDARDSIGNALGENERATOR 3FM/AMIFGENERATOR. 10.7MHZ,455KHZ(465KHZ). OSCILLOSCOPE Checkwaveformat CheckDSPwersu I ReplaceDSP(lC5990) QUIEUTMETER LEVELMETEROEACVQLTMETER 0 4 X X 5: : - P-ppY_
2、6.LOOPANTENNA pin7680ofIC5990 andICsoldering 7.DUMMYLOAD(4ohm) e.swDUMMYANT. Q - 9.FREQUENCYCOUNTER FMSTEREOMODULATOR X X 10. Checksignalat CheckpowersupplyoflC0316 ReplaceIC pin1,20 ofM30316 andlCsoldering .|MpQR|ANTS Checkthepowersourcevoltage i .SelectdesiredBandandFunction. SetToneControlatmidpo
3、sition CI|9IsignalatPli 14 Check9YiV|Ia99 RQPIQCQIa5$t ModulateAMto80%amplitudewith 4OOHzsignalandFMto22.5KHzdeviation with4OOHzsignal. O I I 2 3. GIIC3403 IQ19O9I4-5V) (Q (5.SetVolumeControltoapproximately 5OmW(4ohm) Q ReplacelC3403 r 5)DISPLAYNOTWORKING OLOCATIONOFADJUSTMENTPOINTS (AUDIOSECTION) T
4、UNERPCB(PARTSSIDE) Q-1;_,f;f“f;,; 14 XJ;.;J;_;“F1. 1 “If 2 1I .a:iT.*Iit 55 Jrr; V ., _._.:,:.: ; 1:V.3i,-*rii 4-,r :4“: inn A,. : . wit, VIE:-Z:Z3EIi1III1 CCIIEIiIiJEITi.J .H, EIZTEIEEZIIEIII CZ.;I_.IF_:IIIEIT_JI_Il 4:YV!;_ O V , 42. Checksolderingofpin26 ,:7:gi_ i*fjf:.ert;i1e.-MU t, gsti OIIC7530
5、 , Ir, 19 :4 ,:31 it A: I CheckXF1702(4MHz) ICheckpowersupplyofIC7530 I * itV I1%_|-W -r.; , : ,;f*Ww“T?YM% WTi$T Wti , Z t ./Jig wjV nu Ki .7 . ,k.e. ,.f-,A ,./J Checkvoiiageaipinr Replacei I II H”1 012I %E . -,;4 ,“* / r_-it 1,_-,_ -.vw5, _ i4mi; _, ,V-.i: 7:4It ;_ vhpv/7Q?br :3/,t; _ 1%;I ,;:,f.H
6、. .V; Eg - Ir eaJit _54iW t -.i .,r* 11” J-HIt . M ,M,-m,;W “:5-r.!,;I H ,5 Y4Iii r-gr-.ir;if iii_12,. ,3 ,;,:3 I7 - ii- I * ”*.71iifif1 #:r1rr *e,;?.=”el_t.lb-aeattzezar1. _. e,.;.;.4.ett.t.aI,?memaa.;waufwiiarn-iL.14-K:-3-5/irivi-14iivi;v:%el.1?stv;.s;e.t.?.=,-.1,.;.;v.1.at.J-vb; 1.TUNERSECTION 2)
7、2BAND(FM/AM)AMADJUSTMENT 1)FMADJUSTMENT FrequencySetting I I Item ItemCONNEWONsteps.s.e RadioDialAdjustment REMARK rFrequencySwine lPeint CONNECTIONStepS.S.GRadioDialAdjustment REMARK Point .0 ConnectFM/AMIF455KHzTunetoAM IFT Maximum TunetoT1(ORG)FMIFTMaxgainand I:generatortoloopANT.1(465KHz)thelowe
8、stT2output 110.7MHzthelowest T3(BLUorBLK)symmetrical CUPl9haAMANT9(WHT) andI295! IFAdjustmentFig.1 FMDET3curveIFAdjustmentclosetoloopANTand Vcurve I TunetoL2 Best resonating 2Repeatstep1untilnofurtherimprovementcanbemade.AMIFoutpoint(IC1pin 2Repeat1untilnofutherimprovementcanbemade. takeout thesigna
9、lfrom No19)(SeeFig.3) 387.3MHzthelowestFMO30CQ|Lpaintof$(;_ AMConnectAMsignalTunetoAMOSCBest FrequencyFig.2 .frequencygeneratortoloop3515KHzthelowestCOIL(RED) resonating coverage TunetoVC1 Bestresonatingcoverageantenna,VTVMandT102pointofSSG adjustment 4108.3MHzthehighest OSCTRIMMERpointofssc. adjust
10、mentoscilloscopeas 69OMHz9OMHz Notrequired TrackingFig.2 5Repeatsteps3and4severaltimes adjustment7106MHz 106MHzVC2 Maximum separationGeneratorto8 98MHz98MHzRV1 Best adjustmentS.S.Gadditionally separation ICIO1PINNO.19 GNDt R4BODYOPENorGND lNQ OUT- Fig.1 (ll lFM:OUTPUT:CmM8167“)PmQ19 5AMIFOUTPUT:lC10
11、1(TA8167N)PINNO.19. lFGENERATOR TUNERPCB .-.-ma. Ii_ Fig.4.TunetoAMOSC Best 5Repeatsteps3and4severaltimes. lIy41650KHzthehighest TRIMMERresonating (VC3)pointofSSG ANTTRIMMEROutput( 3AMSeeFig.4TunetoAMMaximum 9tracking662OKHz ANTCOILoutput StereoConnectStereo adjustment(620KHz)L103 TunetoAMANT Maximu
12、m inFig.2 714OOKHzTRIMMER output (14OOKHz)(v04) 8Repeatsteps6and7toobtainsuitablesensitivityat620KHzand14OOKHz. 1; LOOPANT lTUNERPCBAMSSGout CQ) AMANTLOOPANTIsocm 43 - ssc PINNO19M MAINPCB TUNERPCB o OUT ISPEAKEROUTAMANT I75ohmDUMMY OUT. MAINPCB TUNERPCB*H79*I rvjIINOUT IN VTVMOSCILLOSCOPE FMANT(TP1
13、) ,SPKOUT_INour IN VTVMOSCILLOSCOPE l:I 4ohmload Fig.2 i : I W IFGENERATOR Fig.3Fig.4 -18-_1g_ t RadioFans.CN 收音机爱 好者资料库 . .-. .i. -9- I.ta.0.s_.2EaW.:,ti;.-.1;.m,i.i.;.;Ma.i.=amia.eai-1.=ii.cs.a.i;.it.as-xx-/aawvi=-V ._.=_a,n t ir. . -,. . , . .r -;.-.-“.,i.3-L“; z Gaze“tLTb.I3.;:. 2.TAPESECTION 3_
14、(31)$ECT|QN 1.RECORDINGemsADJUSTMENT 1)Cl-VADJU3TMENT 10tdamnobe a)ConnectfrequencycountertoC401(seeFig.7)andsetR/Pswitch (S3-0)torecordposition. . 1P9Pr -A.Turnpoweronwithoutloadingadisc. b)AdjustT401(BIASOSCCOlL)untilfrequencycounterreads52KHzatSTEREOpositionofFMMODE/BEATCUTswitch. 1 2.TAPEAZIMUTH
15、ADJUSTMENT a)ConnecttheequipmentasperFig.8toadjustthetapeazimuthwithtesttape(recordedat8KHzMTT-113CN). b)PlaythetesttapeafterinsertinginDECKA,setVOLUMEtothreeoclockdirection. c)Adjusttheazimuthadjustmentscrewofleitsideofrecord/playheadformaximumoutputandthesamechannelphase. (seeFig.9,10). d)Repeatst
16、epsacatDECKBposition. e)Afteradjustment,besuretolocktheadjustingscrews. l / 1j. CU ConnectS2(Asymmetryshort) IConnectTP5toGNDandTP2topositiveterminalontheFrequencyCounter. ITIUO AdjustVR1702sothattheFrequencyCounterreads4.46OMHzi(0.01MHz). DisconnectS2. *it/s%/ii/3 T“ 1 A1 ._j | 1 3TAPESPEEDADJUSTME
17、NT . .t a)ConnecttheequipmentsasFig.8toadjustthetapespeedwithtesttaperecordedat3KHz,MTT-111N. jjj- .h_.j.1 1)SettheFUNCTIONselectortoNORMALpositionandpressthePLAY(D )utton. jg;W%;WjLi1._,:. A73”: if, taA;J:1! b . T I.Wurmm:-.;n.,.-.:.g_:i;.;.MWm, %:L_.,. A,_._. 2)Adjustthesemi-fixedresistor(RV801)so
18、thatthefrequencycounterreads3KHz. if3;)“1*;.Yj;i T“., . Z.*l_:“._.:_._-4_J1hj;j;t,jr:|V;i$,Tif AK _W.xr.j;v._V. WvwmEq.3j.?.:7 ,41,igijwltr, Ni._1_; c)Highspeed jvtzj.2.) 1)InsertatesttapeintoDECKBandsettheFUNCTIONselectorto“HIGH”position. .1IW thatiMF;E3ltiFf. l*“I“;?;?l. ._.it - _. 2)PresstheRECOR
19、D(Q)buttonofDECKAandpressthePLAY()buttonofDECKB. KQ33 (T. =. .“ -,f;-tw V.;j.:.;.:“#r:.;ik,yl_,ijf_ .1._-“=“Mk .!.Yr.,.1. .5 23 .,-., 4.4.-_-v u. l -1._,-cw-_ .;.$U #4r .e=:S I gb -r$-1 _.tj_ .ew. rt; 1 5?-.1: 3ThthdotHIGHositionisfixedaoximatel 54O0Hz660OHz. .TW,4);fit ,;,;.r-rt.fK._._,_.h,.;.AM_;r
20、 KI 1Yr.J i. j-WM-.,;5j.* .1F) 51=g-m_;_;,;.;,;.,;,.i_H .7 521-(HzFREQUENCYAdl“5I.-I-I. is * I J;1:=w 1Ti.3:J. 1-1 C401_ COUNTER2-.- “;j:“lL.”.l4.f“.Ilr.1_tf,_.et:.,. : =.it %; V! .-_ .;.;.-7;-tsp E,V.5.5j tgr.if*- 1”i*1 =*.r.s.-._-$.:. - . Y W-._“,I111:, .i._H-r“*=.;_-s _- i:.t*“tff. ”lM.;“W1. “ ;=
21、“.,2;.:-;-I TJ f 6: -T2t.:;,u,4=f.;I.1i=i;.ilC;.r.*s- SL.541V.j_._ AdjustingScrew _V j _. /$3,;-.4;),K .fr. II-II-I-I i k5t A5 - 1.-t l,. l Fig.7. IVTVM Fig.9.withoutauto-reverse G2 .-r=.=l HIOSCILLOSCOPE Adjustment IIIIIIIIII UNjTi QEPlayHead 5 lIZIIIIII aI:q:lIIr4 AdustinScrew I.-7/I. . l9 1:llIl.
22、uI/XII FREQUENCYj/l-:I.i-I j 3000Hz COUNTERIIIIIII 0 AdjustingScrew Fig.8. Fig.10.withauto-reverse, /R1702 UNDERTEST it .)A-.-._._._.-.c.-. i l was 5 .ir- rre )enespeeP PPTY .,-;-_-_,_ - _ lzg;,_;:., :.-sf“.:.;I;:.5*;t:.,”“,.“iit-W-.;:t,._*5 TW“ -“*= .;*,-.*1.-wititi“?1/ g.s“;Wi -.-W;t Wt. t. . . -”
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