Toshiba-GT840S-tape-sm 维修电路原理图.pdf

《Toshiba-GT840S-tape-sm 维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《Toshiba-GT840S-tape-sm 维修电路原理图.pdf（8页珍藏版）》请在收音机爱好者资料库上搜索。

1、1 T F A N S l i T C R S , T i i F . i iJ 2.S3.1.2ii, 3 i J fVl .iih Audi,j m , . T R I . 101 Tri2.3.1 ir2. jrXi TK5. !05 T a ; . 7 . : T 6 107.20ei L l . I O I !226910O2X) 21221145322 , iAi DSiA, Tpm(ir8tijr Compensator C i . l . I C i |3niW/X| I N A I.svcl Mt.:r K.;ctrfier I i ! . ; . l O i ;. 102

2、* ! 1 ; -;: i.L201 ; i . 3 . i o i ij2.102.J;io irjiit 2,2!/1.-/XJ: T.-s.n!./.m.-. (lu.pul 2;-2.,;il2x| CJi Tran:,/m*r. .wcr 1 M10. 12fJ. 2f/). 220.230.240Vf!lts) 2!:2I3I41*: Trn,I.im.r. l o w c H 120Vii. M I C . F . X T S P i ! l : 2 - , l , . i I 0 W / J j . k . 3,min. L I N K I.S. 2-:;3!fv;i j c

3、k . 1)1.: 2,1,512W/| 4.k. f,.,mm. l i h A l J PHONE 2;iHll/: M-t,. h s c r J Irvel 2;!Ml!7/ji h l , 1.2A 2;if,r,103O: FM i l o l d - r 2;.i6n2fjOo! Tern-.if-al S l r i p , 7P 2/i.;i0.3i.;|T2 ;j!5n03-aO Dvnamic .S;.i.;aker. 3 - i X 6 * . 2!:23ll01Xi C o . l . I l i a , ; . ! V J J / i l , Krari llf-a

4、rf Ij.inimy S W i T C H E S 5 1 . 101 52. 102 oS. 103 5-. I W 5 i . lO S7 8 251.i,10Xj: Si.-l. H e c r . f J . l l a y U c k 2.H2r/)i U a l . MiiMi.i! j2iiJ51:ijJ: Leaf, R.or-iir. CMpfcnsatipn 2-.Hi72f.O; Seesaw. .Sf.taiier Wiiiitor 2;il-,l2/.; 1.1a!. lila O S C , Powr 2v;rj/fi Seeaw. Pr.wer S.jpply

5、 :APArin,!:.S . 101 i2/ti3W: C2.,M1.12 2.vUmfl : , i ! iy2. :03 I n i . ii2 ! 11. 11. 116 C ! . I M fC. 10. ICS. 105 Ele.:tr.,llic. 5 mH. iO W V E l c - t r o l ) ! i . ; . .30 mt.J, 6 W V !234,a0100; E l e c i r o l y l k . 200 m l d , 1 . 5 V7V 2;:t37471(/.r F i l m M.ca. 470 p F . %0 W V |2,MC23.

6、/X/,1 E l . c i . - c . l y u - . 30 mfd. 6 W V S i o c k .No. V s c r i p l i o r . ;7. 9.107 25415.30000 F,l.cir.lyi.,o. 3 .inH. 15 W V c* arf KV. arn.n film ilnie oll.crwis* nolod H l , 40, l o l 2.551266100 080 ohm 140 R2. 11,20. 2551233200 3.3K ohm 102. 111. 120 K.i. 103 2551000.3(X; 240K ohii.

7、 K W ( N o i s c l e s a ) 1(4. 104 2551000700 47K ul.ra. K W ( N o i s e l c s s ) R5.9.10,24 2551210300 lOK ohm Xi. 105. lOi. 110 124. 133 203 HO. 106 2551212.100 12K ohm R7. 14.25 25512102IXJ I K ohm 20. .30.107 114. 125 120, 130 HS. 108 25512623IW 62K ohm R12. 112 2.5512J 1100 910 ohm Ria35.113

8、2551247200 4.7K ohin ar, 202 M 5 . 115 2.5610112) Somi-flod V a r i a b l e . lOK ohm i l l o . 2 . l l ( ; 255125121X1 5. I K ohm 12 R17. 117 25.ck(:i cliaiinel) A.C. l)ia& ot 55K H z . 0,5;lmA A.C. rase liOmA v, Level meter 70 :o IVilHli n l r - J M.nUvl Hz at ips ( 1 M B ) 1.5 w ; . n s a l fi di

9、stortion (iiaximun! 2 . 5 watts) M i C . lOK .hm. 0 . 3 I m V ia.K I N . I M r.- K . M. S . maximum at 7 - K i p s 0.-15S K. M. S . maximt.m at Z-H ips 180 secrinds m 8 x i m u m ( l , 214 feet tape Witliin 2% at 714 ips W i t b i n 3 ? at 3 - J ips 16-H (W) X UI () X U-V til) 28 lUs mi T O K Y O S

10、H I E A U R A ELECTRIC CO., LTD. 2. GINZA, NiSHI. 5-CHOME. CHUO-KU. TOKYO. JAPAN RadioFans.CN 收音机爱 好者资料库T E C H N I C A L P O I N T S T r * C T - M O S i a st-T- ta(,. ri-,-s.-r w l i d is fully r rans.|.i 7-e(l witli 15 hili-performance i r a n s i s t n r s . 4 - T R A C K 2 - C H A N N E L S T E

11、R E O S Y S T E M j - * . / tr.xi-.i riT a v . : l , i l i - f-.r -rif v.:,y. mai fpiir I rjM-k; ar. iiv.iJh.Mc for ixiiii ways, Tlii-s lape rccurder can te uscd f.r m-.rjral . . f r a i i n n as w c l l as stereo r e c o r d / p l a y b a c k operation. S P E A K E R M O N I T O R S Y S T E M B y t

12、u;:ii-ig 1n the sjaVer n-.tijMr s w i i c h ( S 4 and S K M ) w h i l e rccirding i s heing made, the sound being recnrded can ye irvni.rM by m-.ir. ifie ljjilt-in sjH-akcra. Note. h-wever, ihal llie spf.iker monitor s w i t c h must bo tiirnod ff in r c f . r i i t i x w i t h Ke mii rphone. in r.r

13、df.T to p r r v n t limvlinj; wliich c m l d bi; prcduued i f the mirrophnnes are placed (/se Ui th i p e a V T , . iwiif.ti ar-; turn! -ft, ri. .Lnjnd i-s prirfliitMil fr.m llie s;.eiik-back operati-ns. H E A D P H O N E T E R M I N A L I S P R O V I D E D A h-dii.r -J u-.-r;.r,.i! IA .rvided s., U

14、iai y.u niay (Mijuy (ippealidK niuiit even in niiisy surrouiidiny or at U t o hour T C N E C O N T R O L IS P R O V I D E D I h c pt.rj ?e f ne f-nind is l.il the tonal qiialiiy nf ihe unit to any dtKnt betwoen fuU bass and full trtbie. I;.t.3ti:,/ K ktvA. ( tb r i i i irx rr-as.* t h i r e b l e su

15、bduej the base, rntalinK tbe knob to the left L I N E F R E Q U E N C Y C O N V E R S I O N F . r i-r.!- fr,ojve r . l t e r against ihe ivipstan sleeve, and hv lake u | i dl e r JIUJUIISI llu- m.tor pulley and frietiv-ii drom. Ttic rtaii-fi ihv motor i s Iraiismitied throuh the nioior pulloy, d r i

16、 v e idler, and flywfioel to the caj-siiin sleeve. T h e tje i s d i i v i n being pinel.ed bciween cnpstan sloeve atwl pressiiie r o l l e r . At li.e same l i me . a p.-ri - f (he -.uiion * ! m.ior i s transmitted lhriib the motor inilley. i.ike iip i dl e r. ftid f r i e t i o n drum to ibe lake-

17、up reel drum .i o.-%:er lo take tip the tape. Hesarditit; llie f r i e i i o n nieilumism of the take-iip reel drum. the ( n e t i . - n drum i s p.sh. i.;J!d by the f r i eti on drunt spring and a I r i e t i o i i a l foree i s pnxlucod tetween f r i c t i o n drum uitd take-p reei drum ielt whiel

18、i i s boixied un ibc luke-up reel drum. R E W I N D T h e feed and take-up brakes a r e releaseu fr.Hii respeciive reei drums, but ibe f r i r i i o n liruni br.ike i prestvi .iiist the f r i e i i o i i drum. Tbe drive idler is pressed against ibe motor ptilley aiwl I l y n h e e l . and the rewitv

19、i U-lt ii;:iins; the f l y w h e e l . T h e rulation of the molm is t ra i i smi l i e d llirough ihe motor pulley, f i y w h e e l . and revsind I v h to i!ie feiv. r t e l drum. Since the f r i c t i o n dnmi i s engagiH) by ihe f r i c l i e n drum brake. the f r i c t i o n a l force ihai i s p

20、.-.icten bclween f r i c t i o n drum and tuke up reel drum feit i s upptied lo tlie tape so tiiat a l a c k tension i s suppln lor ihe tape in order t u prevent it againsi sagging. RadioFans.CN 收音机爱 好者资料库F A S T f O R W A R D Til fc.vd arei tadf-u; Krakes a r e r e l r a s M frum resfjclive rei*l t

21、iruniK. T h e takc-up idler i s pushed-iip into a posilion hifher ihat i : i s m the P L A Y B A C K mwle (.f operaiion, awJ i s pressed againsl the motor pulley and take-up r e e l drum. T h e rotation of the aioVic i% fed not through the f r i c t i o n drum but i s fed d i r c c t l y to the take

22、-up reel drum in .dffr to d r i v e the ;*pe f r w a r d at a f a s i speed. P A U S E _ -i ;,. in a/iditi-n i f t w cr.rlttion in th P L A Y B A C K / R E C O R D mfxle of operation. the pressure pad and pressure r o l l e r are f l e a s M . at tr.? -.ame t;ri.% tht- rewirid U-lt iiralte i s press

23、ed against the rewind helt. S E R V I C E P O I N T l E V E L M E T E R A D J U S T M E N T f O R P L A Y B A C K a aiRnai .( l./f) Hz ttiro-jgh the recf.rd/playhak her.d t e r m i n a l , connect an 8 ohm dummy r e s i s t o r to the sp-aker ixrV. nni pr-ij- l / j v d t l / . w ) acro-ii tbe r e s

24、i s t o r . Under t-bis state, adiual s c m i - f i x e d r e s i s t o r s R44 and R H 4 (JK eteen tbe .silver and tbc red scale marka. L E V E L M E T E R A D J U S T M E N T F O R R E C O R D I N G S t lil. . - l e r i o r m il.e S T K K K O po,itiAn, (,.,-d a iirl .| 1.000 M l -70 dli(0.11 m V )

25、 llir.i,i.l, the M I C . iacit, ! i . . . V ) 1 , I ; . . ; K . . , i r - . l lr,.,b i . tl,.- m a x . n . r.iti.,n, an.i dj.ial the emi f i s . J r . s i . l c r s B and RM.3 o that , t.Vf F.irti-.- of the ievei meer is deflerted tu the lii.undary between the silver and the red scale marks. A D J U

26、 S T M E N T O F P L A Y B A C K S E N S I T I V I T Y A N D D I F F E R E N T I A L S E N S I T I V I T Y B E T W E E N T H E T W O C H A N N E L S St a ftandard M/. tpe, .it tbe VOI.tNU-; and T O N L control knohs in tbeir maximum positions. and adjust a m i - t . x r e s i s t - r s f.-.rp ar K i

27、 i ) HK ohm) s: the stereo playback levels a r e made I V to 1.5V ( + 4 2 d B ) . Ir. i h i s Ciie the levei dif/erence b e t * e e n the right and ihe left channels must be writhin 1 d B . R E C O R D I N G C U R R E N T A D J U S T M E N T Fefrf ftiTj.! i , 0 O ; H z O d B (0.11 m V ) througb the

28、M I C . jack, connect a 100 ohm r e s i s t o r in the ground l i n e m/i.M In ( b i s afijustment, the bias curront must be kept cut off. A D J U S T M E N T O F O V E R A L L S E N S I T I V I T Y DIFFERENCE B E T W E E N T W O C H A N N E L S .He-ord i i;nal of IMK) H z -WJ d B (O.lmV) through th

29、e M I C . jack .setting the volume cuntrol v a r i a b l e r e s i s t o r s at tbeir .Tiaxiwim piii. U s e an o s c i i l o s c pr A . C . output meter across the output and P h i l l i p s s c r e w d r i v e r for the A z i m u t h and HeiRbt adjustments. .Aiim and Heighl adjustmcnts i s a means

30、of moving tbe recordplayback and erase beads up or down so that i h e heads positioned exactly in line w i l b the pre-rocorded information on the tape. Misadjustment of this s c r e w would cause eros.ilalk. Record/ Playbsck B I A S A D J U S T M E N T Set the tape recorder i n the recording state,

31、 connect n 100 .hm r e s i s t o r in s e r i e s to tbe gn-und sido l e j d * i the record/playback head, and adjust t r i m m e r capacitors (CLS. C I J S ) so tha. tho w l l a s . . drop acr.sa lt,e resi is 55mV as measured w i t h a A . C . nieter. ECOD.PLA4). Track 3 . R E C O R D I N G O N T R

32、 A C K (3) For recording on tracit ( 3 , , .set th.- sclector s w i t c h in tiie K I G H T position and adjust the level w i t h the right volume control. HEAO r H s:i.!:iiiSi!V ; / Track i 4 . R E C O R D I N G O N T R A C K 2) Then recording on track (3J hn- U o made. lornnver iho tape togcther w

33、 i t h i t s reels and interchange the reel p.,ii!ion arw ihcn. resum r - c r o i n g oi, ( r a k anel, operation face panel, back cover, and m.iin cabinet. .-a) R E M O V I N G THE P A N E L A N D O P E R A T I O N F A C E P A N E L ( S e e P h o t o g r a p h 1 a n d 2 ) Itemove the counlersunk sc

34、rew Umm X r.n.m) of tbe last forwaixl lever, n.td remove ;h,- f.isi o i w n n l lexer. l o.ei; the set screw of the operation knob. and remove the operation knob. Hemove the three volume tone kr.ob, speed seiector knob and head cover. Nexl, loosen the pan-bead screw (2.6mmK6mm) in the head cover, ai

35、xi remove tbe remaining pan-he.id s c r e w (3mm X 6mm) also in the head cover. Nexl, rcnuwe tlie binding s c r e w s (eight s c r o w s : tiiree s c r e w s of nirnXilmm aixi tbe olher s c r e w s of 3mmX8mm) which d a m p the panel aiid operation face panel. Wben this i s done, ihe panel and opera

36、tion face panel are ready to be removed. . b) R E M O V I N G THE B A C K C O V E R ( S e e P h o t o g r a p h 3 ) T o remove the back cover, remove the two pan-head s c r e w s (3mmXllmm) which are the elampiiig s c ; e w s v-f i-.e tvi.-k cover and remove the two pan head s c r e w s (SmmXlGmm) w

37、hich are of rubber feet nd are iitJicaii-d by arrv-ws. Paivhead Scre*,3tnmX 12nn-(WasJwr.anm) ! Foot.fiitt)er,Bjck Cover-Panhead Screi,3iimX lemm-ZXt -Foot.Rkiber.Back Cnxt Pholograph 3 c) H I M O V I N G THE M A I N C A B I N E T f S e o P h o t o g r a p h 4 a n d 5 ) H e r w v lit- U f k Cov-r. S

38、f- ti.e (. ;.Kra;,!. 1, rr-m-jvr it.- .v.il .imiri iunk screwa lmm X.Jtimm) and Iwi pan-head s c r e w s U m m x a S m m l w h i c h are .f rubber feet and a r e iwlicaed by a r r o w s . See l l w phoiKraph 5, unsolder the connections of th-e fiMt s h a k e r lead w i r e v . He tw iival c.uniersun

39、k f c r e w s (4mriiX.inim) frcm tbc c a r r y i n g band. Remuve iij- : w o remaining Pn-(ed .lerew Ummif-mm). Wben this i s d- Lead val Cj-itrsurik Screw. Band M*g.35fTn 6ar)d, Carrying Oval Coufitersunk Screw, Band Mte.,4mmX35niPi -Speaker Lead -Panhead ScreM.AiimX35niin - M a m Cabinet -Speaker

40、Lead Photojraph 5 LINE V O L T A G E S E L E C T I O N M E T H O D ZOO 0 120V ll _ hE-2C PPBW lfBlfar 1201 Po.er tiMtw 1 . Insure that the power cord i s disconnected from the power l i n e receptaclc. 2 . T h e line voltage seiector s w i t c h shaft i a accessible ihrough the holl drilled in tbe h

41、ack cover. 3 , Employing a s c r e w d r i v e r , tuin the seiector s w i t c h so that the desired A . C . voltage i s siipplied to tbe lape ree order. I Ail SHitche* thiiwn in pUybtck i . AH caMcitur valuea in mfd unUii iiihfronit n,.vJ. a, APl r vli-i In Mhm* k-I.U(*J (ihtiwn in plsybicli puiiliun) S. SZ, Sm Leaf switch for tnuiiiiK C, S3, S103 Lvkl switi-li for rccirtni cumpettiiioii. (Sh.*n in t.pc ipi -rsi 7. Sl.SlW Seeaw Swilcli (ur Si*l*er v H. S5, SI5 Slide Swilth for ilanni-l lecior 9. Sr liini uiitUlor power UI. S7 Seesaw iwilch U.r tw-r upply II. St Leaf vMKch SCHEMATIC DIAGRAM