Technics-RSTR979-tape-sm 电路图 维修手册.pdf

《Technics-RSTR979-tape-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Technics-RSTR979-tape-sm 电路图 维修手册.pdf（34页珍藏版）》请在收音机爱好者资料库上搜索。

1、,-,.,. . ervlce ORDER NO. AD9301003CO anual CassetteDeck Dolby NR-Equipped Stereo Double Cassette Deck * DOlDOLBYB.eNR HX PROI - NEW MECHANISM FOR RS.TR979 (AR.1) SPECIFICATIONS ,. CASSETTEDECK SECTION Deck system Track system Recording system Bias frequency Erasing system Heads DECK 1 Stereo casset

2、te deck 4-track, 2-channel AC bias 80kHz AC erase .-. Recording/Playback head (Permalloy) x 1 Erasing head (Double-gap ferrite) x 1 Recording/Playback head (Permalloy) x 1 Erasing head (Double-gap ferrite) x 1 DECK 2 Motors DECK 1Capstan/reel table drive (DC servo motor) x 1 Reel table drive (DC mot

3、or) x 1 Capstan/reel table drive (DC servo motor) x 1 Reel table drive (DC motor) x 1 4.8cm/sec. (1-7/8ips) DECK2 Tape speed Wow and flutter For (PP)area For others 0.1% (WRMS) 0.07% (WRMS) i:0.2%(DIN) Fast forward andrewindtimes Approx. 45 seconds with C-60 cassette tape Frequency response (Dolby N

4、R off) NORMAL For (PP) area For others crO2 For (PP) area For others . 40Hz-15kHzi:3dB 20 Hz-17 kHz 20Hz-16kHz(DIN) 40Hz-15kHzi:3dB 20 Hz-17 kHz 20Hz-16kHz(DIN) Technics I RS-TR979 Area Colour I(K). Black Type *HX Pro headroom extensionoriginatedby Bang Olufsenand manufacturedunder license from Dolb

5、y laboratoriesLicensingCorporation. DOLBY,the double.D symbol,and HX PRO are trademarksof Dolby laboratoriesLicensing Corporation. METAL40Hz-16kHzi:3dB For (PP) area20Hz-18kHz For others20Hz-17kHz(DIN) SIN(Signallevel=maxrecording level, CrO2type tape) NR off56dB (A weighted) Dolby B NR on66dB (A we

6、ighted) Dolby C NR on74dB (A weighted) Input sensitivityand impedance REC (IN) Outputvoltageand Impedance PLAY (OUT) HEADPHONES 100mV/47kQ 500mV/500Q 37.5mV/(8Q) (Loadimpedance8Q-600Q) .GENERAL Powerconsumption Power supply For (PP) area For(GC)area For others Dimensions (Wx Hx D) 430 x 145x 280mm(1

7、6-15/16x5-23/32x 11-1/32) 5.3kg(11.7Ib.) 28W AC 60Hz, 120V AC 50/60Hz,110V/127V/220V/240V AC 50/60 Hz, 230V-240V Weight Note: Specificationsaresubjectto changewithoutnotice. Weightanddimensionsare approximate. SU6HA5+tlOC,:. 1.1 1_1 -tv1 A.STIiRC-oPf - Suffix for AreaColour Model No. (PP) U.S.A./Can

8、ada. (EB) Great Britain. (EG) Germany, Italy and (K) ContinentalEurope. Asia, Latin America, (GC) Middle Near East and Africa. RadioFans.CN 收音机爱 好者资料库 RS.TR979 .CONTENTS Page SAFETY PRECAUTION2 ACCESSORIES3 CONNECTIONS3 LOCATION OF CONTROLS4, 5 ABOUT THE ATC FUNCTION6 DISASSEMBLY INSTRUCTIONS7-11 AD

9、JUSTMENT PROCEDURE12, 13 MEASUREMENTS AND ADJUSTMENTS14-16 TROUBLESHOOTINGGUIDE17-20 TERMI NAL FUNCTION OF IC21-25 BLOCK DIAGRAM26, 27 SCHEMATIC DIAGRAM28-40 Page WIRING CONNECTION DIAGRAM41 INTERNAL CONNECTION OF FL42 PRINTED CIRCUIT BOARDS43-48 TERMINAL GUIDE OF ICS, TRANSISTORS AND DIODES49 PACKA

10、GING49 EXPLODED VIEWS(Cabinet parts)50, 51 REPLACEMENT PARTS LIST52, 53 EXPLODED VIEW(Loading cassette mechanism parts:DECK 1 and DECK 2)54-57 REPLACEMENT PARTS LIST58-61 RESISTORS AND CAPACITORS62-64 .SAFETY PRECAUTION(This safetyprecautionis applied onlyin U.S.A.) 1.Before servicing,unplug the pow

11、er cord to prevent an electricshock. 2.When replacingparts, use only manufacturersrecommendedcomponentsfor safety. 3.Check the conditionof the power cord.Replace if wear or damage is evident. 4.After servicing,be sure to restore the lead dress, insulationbarriers, insulationpapers, shields, etc. 5.B

12、efore returningthe servicedequipmentto the customer,be sure to make the followinginsulationresistance test to prevent the customerfrom being exposed to a shock hazard. .INSULATIONRESISTANCETEST 1.Unplug the power cord and short the two prongs of the plug with a jumper wire. 2.Turn on the power switc

13、h. 3.Measure the resistancevalue with ohmmeterbetweenthe jumperedAC plug and each exposedmetal cabinet part, suchas screwheadsantenna,controlshafts,handlebrackets,etc.Equipmentwithantennaterminals shouldread between3MOand 5.2MOto all exposedparts(Fig. A).Equipmentwithoutantennaterminals should read

14、approximatelyinfinityto all exposedparts (Fig. B). Note:Some exposed parts may be isolatedfrom the chassisby design.These will read infinity. Antenna terminal Exposed metal part .-J. Ohmmeter (Fig, A) Resistance=3 MO-5,2 MO Exposed metal part Ohmmeter (Fig. B) Resistance=Approx. 00 4.If the measurem

15、entis outsidethe specifiedlimits,thereis a possibilityof a shockhazard.The equipment should be repaired and recheckedbefore itisreturned tothecustomer. -2- RadioFans.CN 收音机爱 好者资料库 .ACCESSORIES r- AC powersupplycord (RJAO019-2K)- - - (EG, Gc) (SJA172)-.-. . . .(PP).1pc. (VJA0733)(EB) .CONNECTIONS IRS

16、. TR! Stereo connection cables (SJP2249-3)2pcs. Stereo mini cables (SJP2257T)2pcs. Power plug adaptor (SJP5213-2)1pc. (For GC area only) I Before makingconnections,be sure that the power to this unit and all othersystemcomponentsis turnedoff first. See the operatinginstructionsof the receiver(or amp

17、lifier)and the compactdisc playerfor details. Make connections in the numberd sequence by using the cables. Note: Avoid letting the cables touch each other as much as possible, otherwise noise will be generated. Rear panel of this unit , (D ) (L)(R)(R)(L) ,., Stereomini cables (included) (R)(L)(L)(R

18、) PLAY(IN) Household AC outlet (AC120 V/60 Hz) AC OUTLET 3 AC powersupplycord (included) _Stereomini cable (not included) REMOTESYNCHRO EDIT Compact disc player (not included) REMOTE CONTROL OUT The REMOTECONTROL and SYNCHRO EDIT terminals can only be used with selected Technics Components. Please c

19、ontact your dealer for details. The following functions can be operated by remote control (When connectedtotheappropriateTechnicsreceiver): Playback, Stop, Pause. Rewindlfast-forwardsearch, Record, and 1-2(A-B)deck selection. The REMOTECONTROL OUT terminal is provided to connect a Technics Compact D

20、isc Player or Graphic Equalizer. AC OUTLET (UNSWITCHED: PP area only) Power isalways available, regardless of the units power switch set- ting. Audio equipment rated up to 100 W can be connected. . -3- RadioFans.CN 收音机爱 好者资料库 RS.TR979j .LOCATION OF CONTROL 2) (3 00 DECK 1 Control section Controls co

21、mmonto both tape decks CD Power STANDBY/ON switch (POWER, STANDBY/ON) Dolby noise-reduction button (DOLBY NR) This button is used to reduce the hissing noise heard from the tape. This unit is provided with both the B-type and C-type noise-reduction systems. 45 00) DECK2 Recording-balance control (BA

22、LANCE) This control is used to balance the left and right sound levels during recording. Recording-levelcontrol (REC LEVEL) This control is used to regulate the recording level. Bias-adjustment control (BIAS ADJUST) This control is used to equalize the frequency response during recording. 11113) (1(

23、 00 DECK1 Control section (continued) Controls applicable to tape deck 1 and/or 2 Cassette holder Reverse-mode selector (REVERSE MODE) This selectoris usedfor selectionof the reversemode(for eitherplaybackor recording). (j)Headphonesjack (PHONES) Synchro-startbutton (SYNCHROSTART) Thisbuttonisusedto

24、startatape-to-taperecording, simultaneously starting deck 1(the playback deck) and deck 2 (the recording deck). Tape-to-tape recording-speed button (SPEED) This button is used to select the recording speed during tape- to-tape recording. Timer switch (9 TIMER) This switch is used to automatically be

25、gin a tape recording or tape playback at a certain time, selected by an optional timer. 1511511 0OJ -,. 16n ATC button (ATC) This button is used to perform ATC (auto tape calibration). (See page 6.) -4- .-. Tape counter buttons (COUNTER 1/COUNTER2) MODE:This buttonis used toselectthetape/linear coun

26、ter indication. RESET:This button is used to reset tlie tape counter in- dication to 000_/00.00. Automatlc-record-mutingbutton (0 AUTOREC MUTE) This button is used to make a silent interval on the tape while recording is in progress. Record button (8 REC) This buttonis used to set deck to the record

27、ingstand-bymode. Reverse-sideplayback button ( This buttonis used to start the playback or recording of side B of the cassette. (The tape will move in the right-te-Ieft direction.) ,( I /fl. c lRS.TR Stop button (8) This buttonis used to stopthe tapemovement. Forward.side playback button ) Thisbutto

28、nis used to start the playback or recording of side A of the cassette. (The tape will move in the left-to-right direction.) Open/close button ( OPEN/CLOSE) Thisbutton is used to open or close the cassette holder. Rewind/fast-forward search buttons (TPS) Thesebuttonsare used to advance or rewind the

29、tape, or to easily and quickly search for the programs beginning of the tape. Pausebutton (II) This button is used to temporarily stop the tape playback or recording. 2,( InlJ I-III IIIIlJ.IJi E- :;:;:=:-3 E-. 400. 3k .10k .-3 In(11 I-II-I IIIIlJ .CJ U1 -30 -25 -20 -15 -12 -10 -8-6-4-2m0 +2+4 +6+ L1

30、1111111111:1111111111111111111111111111111111111111111111, R .11111111111111111111111111111111111111111111111111111111.11 r r Display section High-speedrewind/fast-forwardsearch indicator (ffiJ) Illuminates during high-speed rewindlfast-forward speed search. or high- Tape counter/ATCdisplay Normally

31、 functionsas the tapellinearcounterdisplay. During ATC (auto tapecalibration),displaysthe statusof the ATC operation. ATC memoryindicator(m ) Flashes duringATC(autotape calibration),andthen remains il- luminatedwhen the ATC operationis completed. ATC graphicdisplay Shows a graphic display of the ATC

32、(auto tape calibration) operation. Tape.to-tape recording-speedIndicators (x1,) One of theseindicatorsilluminatesto show which of the tape- to-taperecordingspeedswas selectedby pressingthe tape- to-taperecording-speedbutton. r- Recording indicator (mm ) Illuminates to indicate that this unit is inth

33、e recordingstand-by mode or is recording. -5- Remote-control indicator (R.C.) Illuminatesto indicatethat this unit can now be controlledby the remote control transmitterof the appropriatereceiver con- nected. Reverse-sideindicator1) Illuminatesduring playbackor recordingto indicatethat side B of the

34、 tapeis being used. Dolby noise-reductionindicators (II , m ) Eachindicatorilluminatesto show the type of Dolby noise- reductionsystem selectedby pressingthe Dolby noise-reduc- tion button. ( Forward-sideindicator(I Illuminatesduring playbackor recordingto indicatethat side A of the tape is being us

35、ed. Playback indicator (PLAY) When this indicatorilluminatessteadily,it indicatesthat this unit is in the playbackor recordingmode. When flashing, indicatesthat this unit is in the pausemode or in the recordingstand-bymode. Input level meter During playback,this meter indicatesthe level of the recor

36、ded sound. During recording,it indicatesthe level beingrecorded,ad- justedby the recording-levelcontrol. Reverse-modeindicators(,C:,) Each indicatorilluminatesto showwhichofthe reversemodes was selected by the reverse-mode selector. -RS.TR979J .ABOUTTHEATC FUNCTION ATC(auto tape calibration) is the

37、function which identifies the quali- ty of the tape (concerning bias, level, equalizer) automatically and sets the most desirablerecording condition.It takes about 1 minute to complete the setting. ATC ATC Q 1-1-11l!f LQ DECK Qill 0.I-I - I I Bias adjustment control ATC will begin when the ATC butto

38、n on the deck in which the cassette for recording is inserted is pressed. PerformATC while the other deck is in the stop (or rewind/fast-for- ward)mode. Because the ATCfunction records a test signal onto the tape, any previously recorded material will be erased, so be careful not to ac- cidently era

39、se material which you wish to save. Although ATC can also be performed for a tape which is partly wound, it is not possible at the end of the tape. Although the tape will be wound back to its original position after ATC has been com- pleted, the position may be slightly different from the exact orig

40、inal position. Therefore, perform ATC 2 seconds or more after the end of the previous track. Be sure to set the bias adjustment control to O. The display changes as follows while the ATC setting is taking place. Example: Performing ATC on tape deck 2. ,-,-,-,-, UU.UU indicator flashes. E-:=:;:;:=: j

41、 .,-,-,-,-, E-.,. .-,uu .U u CDPress theATC button. tI -30-2-;-;-;-J I,- II 1- I UU.UUE.,.,.JuLCVCL . t1iII,illfl,ill,iHII,W1o1. . . AY R . CIDATC completed. ,-,-,-,-, UU.UU-:-:-.:-.-:-:-j m ,-,-,-,-, uU.UU . -30 -2;8-6:2-rn-+2;4678 I LI I RI - -_J The counter shows a four-digithex number.The two hi

42、gh-orderdigits indicate a ROMaddress, and the two low-orderdigits indicate the data stored at that address. ,-, ,-, uu H L i 0 9 w h lsetthese digits using the FF or REW button. The high- andlow-order digits of the addressincrementalter- nately each time the FF button ispressed.TheREW button causes

43、these digits to decrement alternately. For fastincrementingor decre- menting,hold down theFF or REW button. ,-, ,-, uu L Example: Set FF in address 56 (see Fig. 1). LSetthesedigitsusingtheF. PLAY or R. PLAY button.The high-andlow-orderdigitsof thedataincrementalternately eachtime theF. PLAY button i

44、s pressed.The R. PLAYbutton causesthesedigitstodecre- ment alternately.For fast incre- mentingor decrementing,hold down the F. PLAY or R. PLAY button. c C,- ,- - . ,- ,- -v- Lsetthese digits to FF using the F. PLAYor R. PALY button. Set these digits to 56 using the FF or REWbutton. e -12- tl) ., Set

45、 data (see Fig. 1) to addresses22 through7E.After this, set 00 (end) in address 7E and exit from Write mode. AftercompletingROM writing,pressthe STOP buttonon OECK2 to restorethenormalTestmode.Thefour-digitcounteronOECK1 displays. n,-, ,-, ,-,n n n,-, uU.UUU U.UU -.rdB:30:-2S-20-1S=12-=10:.8-6-4=2-D

46、O-+2;4:;6:;8 :LI RI ,- - -_J Blinks , Remove the shortingclip from the Test Mode terminals.The FL display will stop blinking. Fig. 1 t -13- 01234567 Low 0 - 80683088 1 - 00786868 2 - DO68 - 3880FF 3 - 8078 - 646C80 4 - EO38 - A8FFC4 5 - 7C64 - 50AD1C 6 - F8A880FF8A 68 7 - F50058742C78 8 - OF - 1888

47、- 50 9 - 28 - 8030 - 72 A - 12 - 88 - 4A 8 - 07 - 96 - 55 C - 84 - 80 - 0 - 60 - 58 - E - 30 - 841800 F - 68 - 6080 - lRS.TR9 .MEASUREMENTSAND ADJUSTMENTS MeasurementCondition .Rec. levelcontrol;Maximum .Timer switch;Off .Recording-balancecontrol;Center .Bias-adjustmentcontrol;Center .Reverse-mode s

48、electorswitch;+z .Tape-to-taperecording-speedswitch;Off .Dolby NR switch;Off .ATC switch;Off .Make sure heads are clean .Make sure capstanand pressure roller are clean .Judgeableroom temperature20:tSC(68:t9F) Measuring instrument .EVM (ElectronicVoltmeter) .Oscilloscope .Digital frequencycounter .AF

49、 oscillator .ATT (Attenuator) .DC voltmeter .Resistor (6000) Testtape .Head azimuth adjustment(8kHz,-20dB);QZZCFM .Tape speedadjustment (3kHz,-10dB); QZZCWAT .Playback frequency response(315Hz, 12.5kHz, 10kHz, 8kHz, 4kHz, 1kHz,250Hz,125Hz,63Hz, -20dB); QZZCFM .Playback gain adjustment(315Hz, Ode); QZZCFM .Overall gainadjustmentand Overall frequencyresponse Normal ref