JVC-TDX3211-tape-sm 电路图 维修手册.pdf

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1、RadioFans.CN 收音机爱 好者资料库 TD-X321 *,c,e,eu,u I tr Removal of Main Parts 1. 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 and main P.C. board. (2) Remove four screws retainin

2、g the front panet. (No. a3o5) (3) Remove one srew retaining the gear and take out the gear. (4) Take out the cassette ggor . (5) Remove two screws (p retaining the bottom side of front panel. (6) Remove two screws retaining the mechanism and take out the mechanism. (7) Pull out the 8-pin connector (

3、CN801) from the main P.C. board. 12 RadioFans.CN 收音机爱 好者资料库 TD-X321 agrcftrc.w esafety Precaution about TD -X321 , TD-x32 1c/J TD.X321A/B/E/G/U SAFETY PRECAUTION The power cord should be bound and securely fastened onto the substrate to avoid contacting other parts and shortcircuit in case of breaki

4、ng of the wire. All wires should be bound and arranged posibly away from the primary circuit, sharp edges of the chasis and heating pans (shown in TTfnT in the diagram) not to touch them. , Parts to be attached onto the back of the P.C. board should be fastened down with bond or spacers. The primary

5、 wires (4 wires) must be tied up in a bundle since the primary circuit is exposed. (TD-X321U only) 0904 0902 0903 v (No. 43o5) 3 RadioFans.CN 收音机爱 好者资料库 TD-X321 ,irwctltctrtt) COMPU LINK CONTROL SYSTEM This is a convenient system which has been originated and developed by JVC. Tha follow- ing are th

6、e brief explanations of its major per- formances: Automatic Source Selection When the provided remote cables are used for connecting this unit to other Gomponents which have COMPU LIN K-l /SYNCH RO ter- minals, the switchover of all system components is possible with simple one-touch of the source s

7、elector button of JVCs amplifier or rsciwr. By doing this, the corresponding mponent will start playing automatically. The source select button of the remote control unit or the activation button of the desired cofnponent can be also used for this purpose. When the components have been srruitched ov

8、er, the previous component will stop play,ing with. in five seconds. Synchronized Record ing Synchronized recording refers to the pross in 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-paus

9、e mode 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 you wish to hear. 3. Press the PLAY/PAUSE button f the CD player. By so doing, the cassette dcck is placed in the record mode and syndrronizod with the C

10、D ptayer for recording. Synchro- nized recording thus can be made po*bto. Notes: o Synchronized recording stops automatically when the CD player stops playing. o To cancel synchronized recording, press the STOP button of the CD player or cassette deck. o Synchronized recording does not start excspt

11、when the record-;rause mode is set by simul- taneously pressing the O REC/RE MUTE arrd l! (pause) buttons in the stop rnode. o The source is locked to the CD position dur- ing synchronized recording to avoid accldenal stops or switch-over to another corriponont. To switch over the components, cancel

12、 synchronized recording f irst MAINTENANCE The importance of cleaning When the tape is moving, magnetic powder and dust naturally accumulate on the heads, capstan and pinch roller. When they become too dirty, o tone quality deteriorates. o the output sound level drops. othe previous sound is not era

13、sed satisfactorily. r recordings are not satisfactory. Because of this, clean the heads, 1 0 hours of use so that optim um will be made. E rase Cleaning the headr, pinch roller and capstan Wipe the heads, the capstan, etc. with a cotton swab with its tip dip in alcohol. For effective cleaning, use a

14、 cleaning kit avail- able f rom your audio store. After cleaning, be sure that the cleaning fluid has completely dried before loading a cassette. etc. every recordings Cotton swab ,n head t t t, E roller Capstan TROUBLESHOOTING What appears to be trouble is not always real troubJe, Mako s.rre first

15、. . . . 1. Recording cannot be performed. * Are the safety tabs of cassette tape broken? lf so, replace the cassette with a new one, or when the recording can be erased, cover the safety tab slots with adhesive tape. 2. Tape does not movo. * Has the ll PAUSE button been pressed? lf it has, press the

16、 PLAY button to cancel the 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

17、- trol to an appropriate volume. 4. Sound is too low, unstable or broken. * Are the heads, pinch roller and capstan dirty? lf so, clean them. 5. Hiss noise is heard, and high-frequencies are attenuated. * ls the record/playback head magnetized? lf so, demagnetize it. 6. Previously recording is not c

18、ompletely erased. * ls the erase head dirty? lf so, clean it. ( Becord/play head t, (No. 4305) 9 . TD-X321 o,a,c,e,e,r,u I WLocation of Main Parts Reaf Switch Board I ( DOLBY NR Board 1 0 (No. 4305) TD-X321 en,e,e,au,u Supply reel disk ake up reel disk M - llCapstan Pinch roller Assy T1il r H ffi I

19、r l -, Erase head Motor R/P head FlywheelAssy FM Bracket (No. a3O5) 11 TD-)fi ;ia,ie*,*l) (8) Take out the panet trom the left iiae of the front panel.and putl out th q.oWer button . : (9) Remve two screws retaining th power switch (12) Remove two screws retaining tfre OCiLV ryn seect board. (13) Re

20、move two screy retaining the opration key board. (16) Remove one screw retaining the balance board. board. (10) Remove one screw reUnng the left side of the chassis and pull out the phone jack board. (11) Remove two joining points retaining the LED indicator board. (14) Pull out the volume (15) Remo

21、ve the hexagona! nolume board. and balanc knobs. nut .,rk, out the (No. a3o5) 13 il)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. bord Remove six screws , retaining the main P.C. board. 14 (No. 4305) 6. Other P

22、.C. boards o Leaf switcr board Remove three scre6 r-etainiirg the leaf switch board. o Hall lG board I 1 , Semove one screw reuining the hall lC board. r TD-X g21 M,llcatctrtu tr Main Adiustments 1. Equipment and measuring instumonB used for adjuments 1) Electronic voltmete 6) Resistor 600 Q (for tt

23、enuator 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 meter 3)Attenuator (impedance: 600 Q) 9) Fequency counte 4)Standard tape.or R EC/PB Maxell UDI (T99) - NormalSF) tape r Pow. rurcG TDKSA - Chmma (

24、SA) tap8 - or equivalent Set the line.voltage selector swit to 240 V/230 V/ JVCME , -Metal tape : 22OVl127Vl12OVl110V according to your local 5) 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 ,

25、 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 procedure o Notice: O dBs = O.775 (V) ItemAdiustment Adiusting point Standard value Remarks

26、 Adlusting motor speed 1. Connect a frequency counter to the LINE OUT terminals. 2. Play back the VTT712 test tape. 3. Adjust volume in motor for norma! speed at 3fi)0 Hz. V RsO1Normal speed: 3000 t 15 Hz Checking wow and f lutter Connect a wow and flutter meterto LINE OUT terminals. Play back the V

27、TT712 test tape. Chck to see if the reading of the meter is within O.16yo (WRMS). 0.16% (JIS WRMS lf the reading becomes moving value even if confirming to the standard, a reclaim may be raised. Repairs are necessary. Checking playback torque Employ a torque testing cassette tape for the checking, o

28、r remove the casette cover and use a torque gauge. 25-7O gr-cmlf the standard torque is not ob- tained, replace the take-up disk assembly. Checking fast forward torque Measure the torque in the fast forward mode in the same manner as in the above. 90-150 gr-cmlf the standard torque is not ob- tained

29、, perform the following. 1. Clean the capstan belt, the idler circumference, the motor pulley, the take-up reel disk circumference, the flywheel circumference, etc. 2. Replace the belt and idler. Checking rewind torque Measure the torque in the rewind mode in the same manner as in the above. 90-150

30、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. Adiusting Head azimuth 1. Connect an electronic voltmeter to the LINE OUT terminals. 2. Playback the VTTTO3L tes

31、t tape. 3. Adiust the head angle with the screw until the reading of the electronic voltmeter becomes maximum for both channels. Screw Maximum output (No.43O5) 15 r TD-X321 NarcEtotru i 3. Routine o electrical circuit adiustment : Perform the tape transport checks and head azimuth adiustment before

32、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 point Adiustment position Co

33、nditionAdjustment, Conf irmation *1 Playback level I LIN E OUT I adiustment l (When the head is replaced, adjust playback level.) L: VR102 R : VR2O2 vTT7241) 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 dB 4) DIN OUT :

34、-8 dBs t2 dB (TD-X321G) *2 Playback frequency response adjustment L: VR101 R : VR201 TMT7351 ) 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). *3 Bias frequency adiustment Connect the body of c81 7. L801METAL tape1) Connect th

35、e frequenqy counter to the LINE OUT terminals. 2) Adjust L801 so that the counter reads 95 kHz. r Standard value : 95 kHz l 2kHz *4 Adjustment of HX pro. Rl47 R247 L105 L205 METAL tape1 ) Record with, METAL tape and play it back. 2) Adiust Ll05 and L205 to minimize voltages at R147 and R247 respecti

36、vely with the tape being played back. *5 Rec/PB frequency response adjustment LINE IN LINE OUT L : VR104 R : VR204 NORMAL Blank tape 1) NR switch: OFF 2) Record a 1.25 kHz signa! at an input reference level of -20 dB. 3) Record 1.25kHz and 12.5kHz signals and play them back. 4) Adjust VR104 and VR20

37、4 so that the deviations of 1.25 kHz and 12.5kHz outputs satisfy the standard values with respect to 1 kHz output. o With respect to 1 kHz reference At 12.5 kHz : 0.5 t 0.5 dB (Adjustment) * oRecording gain adjust- ment LINE IN LINE OUT L : VR103 R : VR203 NORMAL, CrO2, METAL Blank tapes 1) Apply a

38、1 kHz signal to the LINE lN terminals. 2) Adjust VR103, VR203 so that LINE OUT terminal level becomes -8 dBs t 0.5 dB. o CrO2 : -B dBs + 2 dB (Confirm) o METAL: -8 dBs t 2 dB (Confirm) 7Rec/PB distortion check LINE IN LINE OUT NORMAL, CrO2, METAL Blank tapes 1) Record a 1 kHz, -8dBs signal through L

39、INE OUT terminals. 2l PlaV back the recorded part. 3) Check thp output with a distortion meter to see if the value conforms to the standard value. o Standard value INORMALI : Less than 2%THD lCr0z I : Les than 3% THD IMETALI : Less than2o/oTHD 1 6 (No. 4305) - Adjustment, Confirmation Minimum input

40、levet check LINE OUT (TD-X321G) search ATT varue with whch uNm LINE lN : -2OdBs t 3dB (tevel difference between Lr N E our: -66 dBs -t H hlil;.,1*:l R and L channets: withn 3 dB) DrN rNN :-24dBs r 3 dB,evell?;llifr;fl: and L channets: within 3 dB) LINE OUT NR: OFF NR:C Play back a normat Ut.nEpf- -

41、INORMAL Hum voltage: betow 2.8 mV Play back a CrO2 blank tape.- CrO, Hr, ,oit.ge: betow l.E mV R EC/PB S/N ratio check LINE OUT Perform recording i, :ff t,:1 nou1 ?:!_2t with no input sisnat on NoR- MAL, Cro2 and METAL tapes ril:il, ili confirm that the reverdifference between the two record- ings i

42、s more than 4ZdB on ,.t, ,.0r. Record on a metal tape. Bias leak : below -40 dBs LINE OUT Record the I kHz referen recording. Residual sound in the erased part: more than 60 dB 4. Location of Adjustment DOLBY NR BOARD VR 2Ol, vRt04 carz I RECORDING FREOUENCY ADJ. uaw spEqo_ ce oE:, HEX PRO ADJ. Lt05

43、 C Rt17 fMArN Bo-oARDl l- lffit L-, ( Recording Chnnel) l-|-_ lLtNp.ur vor-uuE ; ;mtl.Ne-+_ I i I lBoARDl !l lBoARDl i I -1 I ili I L- -i b 1 8 (No. 4305) TD-X321 arcrcrer.tru I Dolby NR Board RET. NOI,AR1S NO.PARTS NAME DESCRIPTION c A01 cA02 CA1O1 c4102 c4105 - cioa- c4105 cA10 c4107 c4108 cA1o9 c

44、4110 c4111 cA71? c4113 -2or c A?02 cA203 c4204 cA205 - n206.- c A?o7 c4208 c4209 CA21O -carr c4212 c4215 CNAOl CNAO2 ICAOl LATOl LA1O2 LA2Ol LA2O2 biot 04102 0A201 a4202 RAOl ETCIAtl-4772N ETClAM-4772N Ftl31HJ-1522 FN3lHJ-3322 EN1Er.l-4752 rvTiiri-iszm FV71HJ-1832ll ETClHM-6E4ZN ETClHM-2252N FV71HJ-

45、1832M rilzrH.l-rszm rv71HJ-8232M ETCIHm-6842N ETClH14-2252N EN1Ert-4752 rH:irii-t527 - FN51HJ-3322 EN1E,1-l.752 FV71HJ-1032tl.| FV71HJ-1852r.t :.CAPACITOR :.CAPACITOR ,I .CAPACITOR ,I .CAPACITOR P.E.CAPACITOR rF.eF- TF.CAPACITOR :.CAPACITOR :.CAPACITOR TF.CAPACITOR i r . cpac I roR .- TF.CAPACITOR :

46、.CAPACIOR :.CAPACITOR !P. E. CAPACITOR ,i. F ion - I .CAPACITOR P.E.CAPACIOR F.CAPACITOR TT.CAPACITOR a. e ?-e I 0n - E.CAPACITOR TF.CAPACITOR TF.CAPACITOR TF.CAPACITOR -eeih - E.CAPACITOR TP.E.CAPACITOR CONNECTOR coNNECT0R_ )OLBY NR I.C FILTER FILTER FILTER FILER 70l,tF 20:10v 7ol,lF 2O:10V 500PF 5

47、1 50V 300PF 5X 50V .7AF 20X 25V o1ottF 5x 50v o18tF 5r 50V Er.F 20 50V . ?l,lF 201 50v o18itF 5X 50V 010MF 5I 50V 082.lF 5:50V 68MF 202 50V t.2MF 20 50V ,-7MF 20r 25V 50F5z50v i300PF 5:50V ,.7tcr. 202 25V O10l.lF 5z 50V ,o18MF 5:50V ETClH,|-842N EC1HM-2252N FV71HJ-183214 FV71HJ -1032M FV7lHJ-82321 8

48、r,r F .ztlF 018i.t F o1oilF 082.tF 20r 50v 20r 50v 5X 50V 5l 50v 5Z 50V 1EC1HM-8/.ZN tETClHl,l-2252N )EN1EM-/,752 tMV5004-007 )MV500/.-O07 rrzoaaNr ,/o20025-oo1s /ozo013-o01s /a20025-001s /02o013-001s 2sci?s (P;Ki-i- 2SC945(P,K)-T 2SC945(P,K)-T 2SC945(P,K)- TRDl1J-8R2Y 8M F .2l4F -7t(F 202 50v 20t 5

49、0v 207 ?SV RANS I STOR RANSISTOR RANSISTOR RANS I STOR RESISTOR - RSTSo- ARBON RESISTO$ ARBON RESISTOX ARBON RESISTOF AgBoN RESJSJo! ARBON RESIS-TOF ARBON RESISTOF ARBON RESISOF ARBON RESISTOT ARBON RESISTOT E,t 7t6u2 RAO2 RAO3 RAO/. RA101 RA1O2 RA1O3 R 41 01. R4105 RAlO RA1O7 RD11J-8R2Y RD11J-222Y RD11J-203Y RD11J-222Y RD11J-472Y riororl-iosv RD161J-103Y RD11J-B2Y RD11J-332Y RD1tJ-102Y 8.2 / lt6u 2-2R 51 llU 20K 5X 1/U 2.2K 5r tt6lJ t,-7K 5t l6bt ioK 3i 1ru - 10K 5Z 1/W .8K 5