JVC-TDX3211-tape-sm 维修电路原理图.pdf

RadioFans.CN 收音机爱 好者资料库TD-X321 *,c,e,eu,u Itr Removal of Main Parts1. Top cover Remove six screws , retaining the top cover.2. Bottom orr Remove six screws retaining the bottom cover.3. Front panet (1) Remove one screw retaining the mechanism andmain P.C. board.(2) Remove four screws retaining the front panet.(No. a3o5)(3) Remove one srew retaining the gear and takeout the gear.(4) Take out the cassette ggor .(5) Remove two screws (p retaining the bottom side offront panel.(6) Remove two screws retaining the mechanism andtake out the mechanism.(7) Pull out the 8-pin connector (CN801) from the mainP.C. board.12RadioFans.CN 收音机爱 好者资料库TD-X321 agrcftrc.wesafety Precaution about TD -X321, TD-x32 1c/JTD.X321A/B/E/G/USAFETY PRECAUTION The power cord should be bound and securely fastenedonto the substrate to avoid contacting other parts andshortcircuit in case of breaking of the wire. All wires should be bound and arranged posibly awayfrom the primary circuit, sharp edges of the chasis andheating pans (shown in TTfnT in the diagram) not totouch them.,Parts to be attached onto the back of the P.C. boardshould be fastened down with bond or spacers.The primary wires (4 wires) must be tied up in a bundlesince the primary circuit is exposed. (TD-X321U only)090409020903v(No. 43o5) 3TD-X321 ,irwctltctrtt)COMPU LINK CONTROLSYSTEMThis is a convenient system which has beenoriginated and developed by JVC. Tha follow-ing are the brief explanations of its major per-formances:Automatic Source SelectionWhen the provided remote cables are used forconnecting this unit to other Gomponentswhich have COMPU LIN K-l /SYNCH RO ter-minals, the switchover of all system componentsis possible with simple one-touch of the sourceselector button of JVCs amplifier or rsciwr.By doing this, the corresponding mponentwill start playing automatically. The sourceselect button of the remote control unit or theactivation button of the desired cofnponent canbe also used for this purpose.When the components have been srruitched over,the previous component will stop play,ing with.in five seconds.Synchronized Record ingSynchronized recording refers to the prossin which the deck srarts recording in ryn-chronism with the CD player. Perform the ryn-chronized recording as follows:1. Set the cassette deck to the record-pausemode in accordance with the recording pro-cedures on page 19.2. lf you want the programmed recording, pro-gram the desired tunes in any order youwish to hear.3. Press the PLAY/PAUSE button f the CDplayer. By so doing, the cassette dcck isplaced in the record mode and syndrronizodwith the CD ptayer for recording. Synchro-nized recording thus can be made po*bto.Notes:o Synchronized recording stops automaticallywhen the CD player stops playing.o To cancel synchronized recording, press theSTOP button of the CD player or cassettedeck.o Synchronized recording does not start excsptwhen the record-;rause mode is set by simul-taneously pressing the O REC/RE MUTEarrd l! (pause) buttons in the stop rnode.o The source is locked to the CD position dur-ing synchronized recording to avoid accldenalstops or switch-over to another corriponont.To switch over the components, cancelsynchronized recording f irstMAINTENANCEThe importance of cleaningWhen the tape is moving, magnetic powder anddust naturally accumulate on the heads, capstanand pinch roller. When they become too dirty,o tone quality deteriorates.o the output sound level drops.othe previous sound is not erased satisfactorily.r recordings are not satisfactory.Because of this, clean the heads,1 0 hours of use so that optim umwill be made.E raseCleaning the headr, pinch roller and capstanWipe the heads, the capstan, etc. with a cottonswab with its tip dip in alcohol.For effective cleaning, use a cleaning kit avail-able f rom your audio store.After cleaning, be sure that the cleaning fluidhas completely dried before loading a cassette.etc. everyrecordingsCotton swab,nheadttt,ErollerCapstanTROUBLESHOOTINGWhat appears to be trouble is not always realtroubJe, Mako s.rre first . . . .1. Recording cannot be performed.* Are the safety tabs of cassette tape broken?lf so, replace the cassette with a new one, orwhen the recording can be erased, cover thesafety tab slots with adhesive tape.2. Tape does not movo.* Has the ll PAUSE button been pressed?lf it has, press the PLAY button to cancelthe pause mode.3. Tape rulli, but no sound is heard.* Are the cords connected correctly? lf not,insert again securely.* ls the remote cable disconnected? lf so,connect it correctly.* ls the. VO LU M E control of the stereo am-plifier set to MIN? lf it is, adjust the con-trol to an appropriate volume.4. Sound is too low, unstable or broken.* Are the heads, pinch roller and capstandirty? lf so, clean them.5. Hiss noise is heard, and high-frequencies areattenuated.* ls the record/playback head magnetized?lf so, demagnetize it.6. Previously recording is not completelyerased.* ls the erase head dirty? lf so, clean it.(Becord/play headt,(No. 4305) 9. TD-X321 o,a,c,e,e,r,u IWLocation of Main PartsReaf Switch BoardI(DOLBY NR Board1 0 (No. 4305)TD-X321 en,e,e,au,uSupply reel diskake up reel diskM-llCapstanPinch roller AssyT1ilrHffiI r l-,Erase headMotorR/P headFlywheelAssyFM Bracket(No. a3O5) 11TD-)fi ;ia,ie*,*l)(8) Take out the panet trom the left iiae of the frontpanel.and putl out th q.oWer button . :(9) Remve two screws retaining th power switch(12) Remove two screws retaining tfre OCiLV rynseect board.(13) Remove two screy retaining the opration keyboard.(16) Remove one screw retaining the balance board.board.(10) Remove one screw reUnng the left side of thechassis and pull out the phone jack board.(11) Remove two joining points retaining the LEDindicator board.(14) Pull out the volume (15) Remove the hexagona!nolume board.and balanc knobs.nut .,rk, out the(No. a3o5) 13il)Xge fta,rill(1) Remove four tr* retaining the power trans-former.(2) Pull out the S-pin wire (FW901) from the main P.C.5. Main P.C. bordRemove six screws , retaining the main P.C.board.14 (No. 4305)6. Other P.C. boardso Leaf switcr boardRemove three scre6 r-etainiirg the leaf switch board.o Hall lG boardI 1, Semove one screw reuining the hall lC board.r TD-X g21 M,llcatctrtutr Main Adiustments1. Equipment and measuring instumonB used for adjuments1) Electronic voltmete 6) Resistor 600 Q (for ttenuator matching)2)Audio frequency oscillator TlDistonion meter (bendpar filter)(range: 50-20 kHz and outpui O dB dith impedance o 600 Ol 8)Wow flutter meter3)Attenuator (impedance: 600 Q) 9) Fequency counte4)Standard tape.or R EC/PBMaxell UDI (T99) - NormalSF) tape r Pow. rurcGTDKSA - Chmma (SA) tap8 - or equivalent Set the line.voltage selector swit to 240 V/230 V/JVCME , -Metal tape : 22OVl127Vl12OVl110V according to your local5) Reference tape for playback (JVC TestTape) voltage.VTT7l2 (for tape speed, r.yow luttr adi.) AC 2/O V, 50/60 Hz (TD-X321A/B)VTT724 (for playback levell , AC 220 V, 50/60 Hz (TD-X321 E/c)VTT739 (for playback requency response) AC t2O V,60 Hz (TD-X32IC/J)vrr703L ( 10 kHz) (for head azimuth 8di.) Ac 2v 1127 v t110 v, 50/60 Hz (Ttlx321U)2. Mechanism adjustment procedureo Notice: O dBs = O.775 (V)ItemAdiustmentAdiustingpointStandardvalueRemarksAdlustingmotor speed1. Connect a frequency counter to theLINE OUT terminals.2. Play back the VTT712 test tape.3. Adjust volume in motor for norma!speed at 3fi)0 Hz.V RsO1Normalspeed:3000 t 15 HzCheckingwow andf lutterConnect a wow and flutter meterto LINEOUT terminals. Play back the VTT712test tape. Chck to see if the reading ofthe meter is within O.16yo (WRMS).0.16%(JIS WRMSlf the reading becomes movingvalue even if confirming to thestandard, a reclaim may be raised.Repairs are necessary.CheckingplaybacktorqueEmploy a torque testing cassette tape forthe checking, or remove the casette coverand use a torque gauge.25-7O gr-cmlf the standard torque is not ob-tained, replace the take-up diskassembly.Checkingfast forwardtorqueMeasure the torque in the fast forwardmode in the same manner as in the above.90-150 gr-cmlf the standard torque is not ob-tained, perform the following.1. Clean the capstan belt, theidler circumference, the motorpulley, the take-up reel diskcircumference, the flywheelcircumference, etc.2. Replace the belt and idler.CheckingrewindtorqueMeasure the torque in the rewind modein the same manner as in the above.90-150 gr-cmlf the standard torque is not ob-tained, clean the capstan belt,idler, motor pulley, flywheel cir-cumference, rewinding idter cir-cumference, left reel disk circum-ference, etc.AdiustingHeadazimuth1. Connect an electronic voltmeter to theLINE OUT terminals.2. Playback the VTTTO3L test tape.3. Adiust the head angle with the screw until the reading of the electronicvoltmeter becomes maximum for bothchannels.Screw Maximumoutput(No.43O5) 15rTD-X321 NarcEtotru i3. Routine o electrical circuit adiustment :Perform the tape transport checks and head azimuth adiustment before following checks and adjustments.Adjustment should be per:formed in the order of-adjustment steps.ln the steps marked with an asterisk ( * ), adiustment should be performed after replacing the heads.Perform this adjustment with the N R switch set to OF F.No.ItemCheck pointAdiustmentpositionConditionAdjustment, Conf irmation*1Playback level I LIN E OUTIadiustment l(When the head isreplaced, adjustplayback level.)L: VR102R : VR2O2vTT7241) Plarr back the vTT724 tet tape.2) Adjust VR102, VR202 so that LINE OUT level be-comes -8 dBs.3) Headphone OUT: -24 dBs t 3 dB4) DIN OUT : -8 dBs t2 dB (TD-X321G)*2PlaybackfrequencyresponseadjustmentL: VR101R : VR201TMT7351 ) Play back,the TMT735 test tape.2) Adjust VR101, VR201 so that LINE OUT level be-comes +0.5 + 0.5 dB (1 kHz - 12.5 kHz).*3BiasfrequencyadiustmentConnect thebody ofc81 7.L801METAL tape1) Connect the frequenqy counter to the LINE OUTterminals.2) Adjust L801 so that the counter reads 95 kHz.r Standard value : 95 kHz l 2kHz*4Adjustmentof HX pro.Rl47R247L105L205METAL tape1 ) Record with, METAL tape and play it back.2) Adiust Ll05 and L205 to minimize voltages at R147and R247 respectively with the tape being playedback.*5Rec/PBfrequencyresponseadjustmentLINE INLINE OUTL : VR104R : VR204NORMALBlank tape1) NR switch: OFF2) Record a 1.25 kHz signa! at an input reference levelof -20 dB.3) Record 1.25kHz and 12.5kHz signals and play themback.4) Adjust VR104 and VR204 so that the deviations of1.25 kHz and 12.5kHz outputs satisfy the standardvalues with respect to 1 kHz output.o With respect to 1 kHz referenceAt 12.5 kHz : 0.5 t 0.5 dB (Adjustment)*oRecordinggain adjust-mentLINE INLINE OUTL : VR103R : VR203NORMAL,CrO2,METALBlank tapes1) Apply a 1 kHz signal to the LINE lN terminals.2) Adjust VR103, VR203 so that LINE OUT terminallevel becomes -8 dBs t 0.5 dB.o CrO2 : -B dBs + 2 dB (Confirm)o METAL: -8 dBs t 2 dB (Confirm)7Rec/PBdistortioncheckLINE INLINE OUTNORMAL,CrO2,METALBlank tapes1) Record a 1 kHz, -8dBs signal through LINE OUTterminals.2l PlaV back the recorded part.3) Check thp output with a distortion meter to see if thevalue conforms to the standard value.o Standard valueINORMALI : Less than 2%THDlCr0z I : Les than 3% THDIMETALI : Less than2o/oTHD1 6 (No. 4305)-Adjustment, ConfirmationMinimuminput levetcheckLINE OUT(TD-X321G)search ATT varue with whch uNmLINE lN : -2OdBs t 3dB (tevel difference betweenLr N E our: -66 dBs -t H hlil;.,1*:lR and L channets: withn 3 dB)DrN rNN :-24dBs r 3 dB,evell?;llifr;fl:and L channets: within 3 dB)LINE OUTNR: OFFNR:CPlay back a normat Ut.nEpf- INORMAL Hum voltage: betow 2.8 mVPlay back a CrO2 blank tape.-CrO, Hr, ,oit.ge: betow l.E mVR EC/PBS/N ratiocheckLINE OUTPerform recording i,:ff t,:1 nou1 ?:!_2t with no input sisnat on NoR-MAL, Cro2 and METAL tapes ril:il, iliconfirm that the reverdifference between the two record-ings is more than 4ZdB on ,.t, ,.0r.Record on a metal tape.Bias leak : below -40 dBsLINE OUTRecord the I kHz referenrecording.Residual sound in the erased part: more than 60 dB4. Location of AdjustmentDOLBY NR BOARDVR 2Ol,vRt04carz IRECORDINGFREOUENCY ADJ.uaw spEqo_ce oE:,HEX PRO ADJ.Lt05CRt17&B ttoTouENcY1205cf,Rzq7(No. 43OS) ltTIX32 rfiircax*rruZBlock Diagram( Playback Channel),-?- - -r-1L_J1-x31G_J; fMArN Bo-oARDll-lffitL-,( Recording Chnnel)l-|-_lLtNp.ur vor-uuE ; ;mtl.Ne-+_ I iI lBoARDl !l lBoARDl i I-1IiliI L- -ib1 8 (No. 4305)TD-X321 arcrcrer.truI Dolby NR BoardRET. NOI,AR1S NO.PARTS NAMEDESCRIPTIONc A01cA02CA1O1c4102c4105- cioa-c4105cA10c4107c4108cA1o9c4110c4111cA71?c4113-2orc A?02cA203c4204cA205- n206.-c A?o7c4208c4209CA21O-carrc4212c4215CNAOlCNAO2ICAOlLATOlLA1O2LA2OlLA2O2biot041020A201a4202RAOlETCIAtl-4772NETClAM-4772NFtl31HJ-1522FN3lHJ-3322EN1Er.l-4752rvTiiri-iszmFV71HJ-1832llETClHM-6E4ZNETClHM-2252NFV71HJ-1832MrilzrH.l-rszmrv71HJ-8232METCIHm-6842NETClH14-2252NEN1Ert-4752rH:irii-t527 -FN51HJ-3322EN1E,1-l.752FV71HJ-1032tl.|FV71HJ-1852r.t:.CAPACITOR:.CAPACITOR,I .CAPACITOR,I .CAPACITORP.E.CAPACITORrF.eF-TF.CAPACITOR:.CAPACITOR:.CAPACITORTF.CAPACITORi r . cpac I roR .-TF.CAPACITOR:.CAPACIOR:.CAPACITOR!P. E. CAPACITOR,i. 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