Luxman-K12-tape-sm维修电路原理图.pdf

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1、RadioFans.CN 收音机爱 好者资料库 /) A C ,-(- (Jptri-,i0tc )(/.ucn SER/|cE MANUAL LUXMAN srEREo CASSETTE DEc K-12 RadioFans.CN 收音机爱 好者资料库 IK-l2 Electronic Section Alignment procedure lo.ITEIS TAPE REQUI RED SEIECTOR POSITION EQ SW I BIAS SWINPUI SIGIALALI GIMENT PROCEruRE LIMITED SPECREMRKS P/B Output LevelMT

2、T- 150TIORMAIN0FX/IALPlayback EAC MTT-150(Dolby 1eve1; 400H2 200nwb/tn) and adj ust trjrnEr potentiorneter to obtain output level of 580nV(-2.sdBn). Ldr P/B Gah trR: T.-107a Rcl P/B Gain lR: VR-107b -2.sdBn -0. SdBn Dolby off Output VR: MAX. -t a-L ,r ia,.r, f_ IFY ni fin MTT- 150cfiz EX NOFMAL NORM

3、AL Mter the step (1), check the P/B output level at the CIOZ node, Also check that at EXr node. -2.sdBn io. sas If rated Ievel cant be obtained, arnp circuit nay be sr.E- Dolby Output Level Check MTI- 150NORT,IAI NORMALSet the Dolby Sw to ON and adjust tritrner pot for Dolby level adjust to obtain o

4、utput level of 580nV (-2.Sdhn) at LINE otn jack. Lch Dolbv Gain R: Rl03a RcI Dolbv Gain R: VR103b Dolby on. Dolby Output Level Check with MPX filter 0l MTT- 150NOM,ALNOFMALSet the Dolby Sw to lrPX filter position and cleck the Dolby output level at LINE OJI jack. Dolby Sw rPx filte/ position. If out

5、 of spec, anp circuit nay be sus- Bar-Graph lvel Adj ustnent MTT- 150NORMALNORMALAdj ust trimer pot for bar-graph leve1 adj ust to obtain 0w indication at 580rnv output level of LINE oln. Ldr Bar-GraDh Level Adi ust R: RI04a Rah Bar-Graph Level Adl ust R: RI04b odB I 0. sd3 (odB level should light u

6、p. ) Playback Head Azinuth Aligunent MTT- 216NOFI|AL NORNALPlayback MIf-216 3180uS +120uS) to reproduce the azimrth aligrunent signals (6.3kH2, 10kHz), and adj ust the aziruti adjust screw to obtain the natim,un playback output level, Also dreck, nonitodng l oscilloscope, if there is no phase-shifti

7、ng between L and R charmels, Playback EQ Adj ustrnent MTT- 216IIORMALNORI(AL Plaltack MTT-216 to ciec-l( that the first stardard siq- na1(3t5Hzl should be at -5.Sdln I 0.sdBm. Then reprcdrce ioldlz signal, and a+j ust P/B EQ trirmer to obtain outDut level of -25.5 -0.5d (5) Set the BIAS sw to EX, an

8、d preset the BIAS current to 650uA. Trirmer Pot for EX BIAS Adj. - Lch T203a Rdr R201b CrO2 400uA (=4nV, at 10 ohns) EX 650u4 (= 6.5mV, at 10 ohrns) 4.Peaking Adjust at MC. EQ. AN,IP NORIAL cfz EX NOFMAL18kHz l0onv ( - 18dBn) 201412 2IkHz To keep out the action of B1AS OSC, insed a tj.p of paper in

9、the leaf switch connected in series with the power slpply to the oscillator. (The leaf Sw is placed near the nain solenoid.) Then put the deck into the RECnode. (1) Set the Equalizer Sw to the iNoRNAI position, and apply l8kllz 100rnv signal to LINE IIPUT. Adjust the peaking coil for NoRMAL to obtai

10、n the maxirRm output at the 10-ohn resistor of the R/P neao. Peakjng Coil for NoRI4AL - Lch L105a Rch L106b (2) Set the Equalizer Sw to the CrO2 position and apply 20kHz 100rnv signal to LINE INPUT. Adjr.rst the peaking coil for CrOT to obtain the naxiflun readins on the VTVNI, Peaking Coil for CrO2

11、- Lch Ll04a Rch L104b (5) Set the Equalizer Sw to the Etr position and apply 2tkHz 10OnV signal to LINE INPUT, Adj ust the peakirg coil for EX to obtain the naxijntnn readins on the T4,1. Peaklng Coil for EX- Lch 1106a Rch L106b Eadr peaki-ng leve1 at the respective rcde, NORAL CrO2 and EX should be

12、 apprcxinately 20dBn at 18kJ1z, 20HIz, zlldlz, conpared with that of lkHz (4) Do not forget to renrve a piece of paper put on the leaf switdr. Adj ust peaking for NoRI.1AL node by use of l8kHz signal Adj ust peaking for CIOZ node by use of 20kHz signal Adjust peaking for EX node by use of 211clz s i

13、gnal Output should be measured across the 10 - ohn reS1stor. .5.REC Gain Adj ustnent (NORIAL) AC-22rNOFIALNOFMAL400H2, 100mVl 3dB(-i8dBn:icB) Output 1eve1 at LINE OUT, noni- toring source, should be 580rnv Adj ust the REC Gain trinner pot to obtain LINE oUT output level of 580nv(-2.5dh) when the AC-

14、ZZI tape 400H2 si$al is recorded and played-back. NOR iAI REC Gain Adj Lrstnent Lch Rl10a Rcn !R110b - 2. s :0.5 dBn Input Level at LINE IN should.be -18dB : 3dB. RadioFans.CN 收音机爱 好者资料库 No. ITE6 TAPESEI-ECTOR PGITION EQ SW I BIAS SW _lNpur srciAlAIINMENT pEnrFnrrDE REQUI RED LIMIIED SPEC REMRKS 16.

15、 REC AdjustrEnt t croz) AC- 511 CrO2cfz 400H2,100mV I 3dB -(-18den 1 jdB) Lrtput level at LINE oUT, moni - toring source. shoul d hc qRnhl/ ffiifrl infhfr3liff;#to obtain LINE ouT 400irz signar i,il; #;r$:l_;lr, iaiJdtiSt i3il:lS 3h:f*il * *$.1*i :?:,iT6i*:;iru f #iilf;:il, -4dB indication of tle Ba

16、r Graph at the EXposition of EQ sw 6 BIAS 5W. Input Level at LINE IN 19. REC Frequency Response Adj ust. (NORtitAL) AC-221NOm4Al NORl,lAL 30-16kHz -20lB against stan- dard i_nput leve1 p$-#i q*#irTix :$ff ,r*rd$.i . - 0 I 3dB at each freqtrency Input Level at LINE IN - Sgann l:.lB z0 REC Frequency R

17、esponse Adjust. I cro2 ) AC-511 CtOZ CtfZ 30-18kHz -ZodB agarnst stan- dard input 1eve1 . _,. wuLpuL rs regarced as odB. f,lr*#il f;i*r-ti# i$sit -sr:i, 0 I 3dB at eaci frequency Input lvel at LINE IN: - 5 8dBn:3dB 2I REC Frequency Response Adj , (Ex) metal part tcle (AC- 701) EX EX 30-20lGlz -20clB

18、 against stan- dard , input level :ff :J:,:Tilj:fftllJi:if,$ff 1;., ffi, ji,) o I 3ds at each frequenry Input Leyel at LINE IN: - 38dBm:3dB I . I r(cL rrequency I I Response Adj nst. | | rn specral case ec-zzr I ruonvru. AC- 511 | CIOT metal I FY- particle I rape I (AC- 701) I NOFMAL CrOz EX 30 - l6

19、ldtz 30 - 18kHz 30 - 20l4lz -20d8 against starq2rd input IEVEl ii,fi; g:.iiil:lfl ffiffr: does not neet the rzor, i J! -ir, iiilluto JB.ff ,B:* steps ( re ) - ,) Tgtl thu Freq. resposne shorvs drop both at 4-81+tz tnrdrange) and over lSkHz(treble). S iin. i- - Lower the bras current. fTum the lRcor.

20、trl_ ,. . ter-cloc*wise di rection. ) wnen they are both increased, See fig. 2 U) z I ffi- r lq. 1 9l ri. a 91- -r-r 9,1 . r l - rlLrcitse .ne Drts current. (Tum the VR clockwise. ) b) lrrhen the frequency response drops only at treble range (over l0lGtz). Sie fig. 3 - :nr,tl peakrng froint downward

21、 by tuming the ,_ peat(rng coil clockwise. il:rrli: response increases only in treble range. z I -T=f t0k I0k2k FI #;i;!trilt.ffintrupward bvetumins the)i- |I I0t RadioFans.CN 收音机爱 好者资料库 N0.ITEMS TAPE REQUI RED SEI-ECTOT EQ $/ | POSITION BIAS SWINPUI SIG.IAI ALI G4ENT PROGnJRELIIITED SPECREMARK c) N

22、ever forget to check the output level of 400H2 standard recordi-ng/playback signal I,JtIen the trir- ner pot for BIAS adj ustnent is tumed for aligDnent of frequency response. d) Extrene tum of these pealing coil and BI/s adj ust 8.s nay ca,rse deterioration of distortion dlarc- teristic or d)nanic

23、range of record/playback outputs. Therefore, when these positions are found extrenE, electronic circuit nay be suspected. (Check the operation of the circ1lit,) 23.Adj ustment of LINE-OUr Bias Trap EX CroZ Connect mlM to LINE OJT and set the node to mCoRD and check output of BIAS leakage. Tjm the tr

24、ap coil so that the output of BI.aS leakage nay me to the ninim.m. Oreck the output of BIAS leakage j.s less than - 40dBn for all CrO2, EX modes. In case it is norc than -25d8, re-adjust it. EX node - Lch L-101a Rch L-101b rrCrOZr node - Lch L-I07a Rdr L- 107b Below - 4odBrn after znd lot rlRXCr nod

25、e Iblby off Aligunent of Dolby l4PX filter (rgkHz) NORMALNOFIALlgldlz standard input level. Apply lgkHz signal to LINE IN. Comect VTt4vl to LINE oUT te:llf.nal and adjust the coil for lgkHz filter to obtain the nfnfur.un reading on the Wi. Thj.s align- nent should be done in the REC mode. The coil f

26、or Lgldlz filter: Lch L-102a RED COm Rch L-102b mD CoRE 19kHz output at LINE oUT should be the ninimrn (no nore than -32.5d8n. ) Input: Line 1n Dolby MPX Filter 0l1. 25.Aligrunent of Dolby MPX filter (approx. 105kHz) croz10 Sktlz standard input levelComect VTVM to REC.oUI telminal. Set the deck in t

27、he CrOr Dosition ard REC PAIEE node. Tum the coil of Bias Tr4 to obtain the njnijlm reading on the VTVM. Bias Adjustnent coil- k$ i_133f, Bstr sffi This step No.25 nay be onitted since this alignnent is done as low-pass filter at the coil slpplier. When it is qnj.tted, however, dreck that the bias l

28、eakage at LINE OUI is less than -45dBn at each NOR!,iAL, CrOz or ,E)C node wilh tl)lbv CFI. Bias Leakage output at LINE OUT should be rninirun. (no nore than -45dBm) Input: Line In Dolby MPX Filter 0ll 26.Dolby Frequency Response Greck AC-22rNORMALNORAL30 -lsldlz -20dB against stsrdard input 1eve1 A

29、pply 30-15ldlz signal to LINE IN and dreck the output level at LINE 0JT. Thg record/playback output of the signal should be 0 : 5dh, riren 400H2 standard input signal 1eve1 is regarded as 0dB. odB 1 sd3 Line In Dorby chl RadioFans.CN 收音机爱 好者资料库 N0.ITEI4S TAPE REQUI RED SELECIOR POSITION EQ SW I BIAS

30、 SWINPTN SIGIAI,AIIGIMENT PROCETIJRLLIitrTED SPECREMRKS 27Record/ Playback output lve1 Greck at Drlby- oN ard -oFF AC-22rNORiTALNORIAL400H2 standard input signal level (odB 1eve1 on tlte Bar Graph) Apply 400H2 standard input signal to LINE IN and record/p1ay-back lt. Theoutput 1evel at LINE oUT tern

31、inal should be 580nV .l 1dB both for Dolb/ 0N and oFF 5 Solv:1dB Dolby Dolby ON OFF AligrurEnt of SA at record/play- back AC-22r AC- 511 netal par-tic1e (AC- 7011 NORIAL CtOZ EX NOFMAL cfl2 EX no signaltlnload the LINE IN tendnals, and nake rccord/playback of the tape. The noise 1eve1 at this the sh

32、ould be less than -47dBn(RISI . Check the noise level at CIOZ and EX position in the sane nalmer. Both at the Dolby 0N and Dolby MPX FilteI 0,1, the noise level should be less than -49dBn. Reco rd,/P 1ay - back noise 1eve1 should be less than -47dBn(RIS). Re co rdl P 1ay - back noise 1eve1 should be

33、 less thar -49dBn(RI4S). ?t) Check of ErasureAC-221 AC- 511 netal padicle (AC- 701) NORI,IAL CtOZ EX NORIAL CrOZ EX lkHz +10dB against stan- dard input leve1 Apply lkHz - SdBrn signal to LINE IN ternfnal, ald record it. Next, rnake note of the output level. Ihen, discorurect the input signal and era

34、se the recorded signal. Check the output 1eve1 at the erased portion thrcugh lkHz band-pass filter, and rnake note of the di.fference cqpared with that before erasi-ng. Output Level before erasing - al (den) Output lve1 after erasirtg - a2 (den) Erasing Capability - A = al-az(dBrn) Take the same pro

35、cedure iI the Cro2 and EX nndes, Erasing Capability A should be better thar 70dBn UselkHz bard-pas s filter 30.0rannel Sparation Greck AC-227 AC- 511 metal partide tape (c- 701) NORTA.L CrOZ EX NORXIALlkHzstandard input 1eve1 (0dB 1evel at the Bar Graph Record lkHz about - l8dBrn signal thrcugh Lch

36、LINE IN, and play-back it, Then neasure the rccod./playbac-k output 1eve1 of Rch via tkHz band-pass filter. At the sane tifle neasure the record/playback output of Lch. Record/Playback Output Level (Lch) - af (dBm) Record/Playback Output Level (Rdr).- az (den) Crcsstalk frorn Lch io Rch: A = a1 - a2

37、 ldB) Likewi.se apply signal to Rch to neasurc the crosstalk fron RclI to Lc.h. Take the sane procedure at eadl ncde with Dolby 0,I. better than 3 sdB Use lkllz band-pass filter. Dolby OFF Dolby ON 1t Crosstalk 0reck MTT- 12IPlay-back test tape MTI-121, and neasure the leakage as per the following m

38、ode, Ldr to Rdr (lst track to 2nd track) Rcl to Lch (2nd track to lst track) better than 50dB UseIWlz band-pass filter. RadioFans.CN 收音机爱 好者资料库 -:ratrl!|lqtFr -r- K-I2 IGOIANICAL PAXT ALICNTOT PFOCEIIJRE Ilo.ITE!6 TAPE mqrrnED SELECTOR rcITICN EQ silr I BIAS srrINPUT SIGIALALIGNIETI PROGTTRELnIlED S

39、PEC RF.ARKS I 2 3 4 Check of Eject Sw. Oteck of Bias osc. Sw. Oreck of Tape Speed Check of Wor Mtr-11lD Mm-11lD r)Cmfirn tiat tlre 0 t; , 1._j + Y G Y REMPLACERDU T.g E TYPE. ac ut6v rli mAT PCta -o20 lrL-?t-g our P/B i,rnNc a 7 Fuse PCB REPLACE WITH SAIiE tYP FUSE ONLY. SYMBOL NO.PART NIJUBERDESCRI

40、PTION NOTE QUANTITY PER UNIT Q50r, 502 D501,r, 504 R503 R502 R501 T-0025 T-0010 R-0001 Fuse PCB Transistor Diode Carbon Resistor PCM-020 25C2320F rs-247 3 1/4W 3. 9KQ 10Kn 4 7KA I 2 4 1 I I RadioFans.CN 收音机爱 好者资料库 Sensor PCB SYMBOL NO.PART NWBERDESCRIPTIONNOTE QUANTITY PER UNIT Ql n, c3 c1 Rl, R8 Rl

41、2 p5 Rl1 R3 R4 4 2 7,9 10 r4-28334Sensor, PCB Transistor Myler Capacitor Electrolytic Capacitor , (NP) Carbon Resistor 2 SC8 28 (RS ) 0.027uFl50v 10uF/16v 10uF/ 16v ERN25UJ 22OQ 330Q 39oo 2.2KSt 3. 3KQ 5.6K4 8. 2KA 10K0 I 4 I 1 1 2 1 I 3 1 2 I I RadioFans.CN 收音机爱 好者资料库 lmp. PCB DESCRIPTION PCU-005 s

42、-0011 s-0010 L-Q002 L-0001 rc-0006 T-0026 R-0009 R-0008 R-0010 Anp. PCB Rotary Sllde Srt Rotary Sllde Srt Record/Playback Mutlng Relay Dolby IC Translstor PLC-2242 sRz-v063s sRz-L083 FRL-414D 0L2/O4CT 8R22lD012 NE645B 2sc-l34s (E) 2sA-798 (c) 2 sc-l345 (E) 2 sc-1815 (Y) 2sA-r015 (Y) 2SC-l7 7 5 (E) 2

43、sc-94s (P.Q) 2SA-872 (E) 2SD-592 (R) 2SK68A Ll 2SK30A sRL9R-1oKn sRl9R-47K0 cRl9R-2200 sRl9R-10oKn sR19R-47Kn SR19R-1OKQ 42-L092-0L L-9-3 47mE BL-21HF sl.2svB-33 su25vB-100 cx5ovB-3R3BP sM50vB-1 sMl6vB-10 (REC EQ) (Dolby) RelayRY101a, b RY002, 001 IC101a, b Q10la, b L02a, b 103a, b Q106a, b 114a, b

44、121a, b Ql07a, b 108a, b l22a, b a23a, b Q109a, b 111a, b Q110a, b 011 Q1l5a, b 117a, b Q00l- tu 005 , 007 , 010, 0L2 Q115a, b Q005 Q104a, b 105a, b 112a, b 113a, b 119a, b LZOa, b Q118a, b I24a, b VR103a, b 107a, b VR104a, b VR106a, b VR109a, b 110a, b 111a, b VR108a, b VRll2a, b L101a, b 107a, b L

45、103a, b 104a, b 105a, b Ll05a, b L102a, b C102a, b C104a, b C110a, b Cllla, b 002 C112a, b 113a, b 10 Seni-flxed Reslator Coil Low Pass Filter ElectrolytLc Capacltor I L2 z 6 2 4 RadioFans.CN 收音机爱 好者资料库 SYMBOL NO.PART NIJMBER l17a, b 119a, b c22, r24a 124b, 003 Cl28a, b cl54 , 155 c004, 006 C149a, b

46、 C133a, b c156, 157 c005 ClOla, b I05a, b C120a, b ClZla, b C123a, b C103a, b 106a, b rJl4, D C107a, b 108a, b 130a, b 131a , b 138a, b 13 9a, b C134a, b cI29a, b Cl09a, b Cl32a, b CI45a, b C140a, b C114a, b ClI6a, b Cll5a, b C118a, b Cl35a, b Cl42a, b 144a, b 14 3a, b Cl63a, b C146a, b 147a, b C158

47、a, b C164a, b Cl52a, b Cl25a, b 126a, b 127a, b cr43 c00r, r53, 161 CI62a, b Cl5la, b c- 0010 c-0009 c-0007 c-0 0 0l c-0002 c-0012 c-0004 T- 0 010 C150a, b Cl4la, b D001, 004 , 006, 013, 103a, b, l04a, b DESCRIPT lON SoIid TantalunCapacitor SM16VB_220 5OVB-1OOBP sM25VB-470 sM25VB-4R7 sM35VB-2R2 CX5O

48、VB-3R3BP sM25VB-470 sM25VB-22 16V lu 16V 0. lU 16v 0. 33u 25V 1u Frr)5zc-220 ru052c-150K FMIlZC-151K r1.132C-331K 412A1003-684K 412Ar003-684K 4l2Ar 003-15 4 K 412A1003-105K AMS50-562J AMS5O-472J AMS5O-2 7 3J AMS50-473J NP-500-562J AMS5O-223K AI1S50-27 3K AMS5O-104K AxS50-104K AMS50-393 DD104B101K50V

49、02 DDl06PH4 7 0J 5 0V0 2 DDrl0D103M50V02 DD314-957BC-r04 DDL07PH680J50V02 Ft1052C220 100pF/ 5 0V NR-5 00-8 51J 1S-2413 2 2 2 2 2 2 I 4 2 2 2 6Fll Capac i to r Mecalized Polyester Filn Cap. Polyestera ra udPdL r Lrr r 2 2 2 2 2 2 2 2 2 2 2 6 2 4 2 2 2 6 I 3 Ceranic Polistyrene Filn Capacitor Silicon Diode Capacitor 2 2 2 2 T6 RadioFans.CN 收音机爱 好者资料库 DESCRIPTION 2D001 D101a, b, 105a, b, 102a, b R106a, b, 11Ia, b, 16