Fostex-X34-mt-sm维修电路原理图.pdf

《Fostex-X34-mt-sm维修电路原理图.pdf》由会员分享，可在线阅读，更多相关《Fostex-X34-mt-sm维修电路原理图.pdf（32页珍藏版）》请在收音机爱好者资料库上搜索。

1、Service ManualModelmultitrackerRadioFans.CN 收音机爱 好者资料库SAFETY INSTRUCTIONSRead instructions - All the safety and operating instruc-tions should be read before the appliance is operated.Retain instructions - The safety and operating instructionsshould be retained for future reference.Heed warnings - A

2、ll warnings on the appliance and in theoperating instructions should be adhered to.Follow instructions - All operating and use instructionsshould be followed.Water and Moisture - The appliance should not be usednear water - for example, near a bathtub, washbowl,kitchen sink, laundry tub, in a wet ba

3、sement, or near aswimming pool, and the like.Carts and Stands - The appliance should be used onlywith a cart or stand that is recommended by the manufac-turer.An appliance and cart combination should be moved withcare. Quick stops, excessive force, and uneven surfacesmay cause the appliance and cart

4、 combination to over-turn.Wall or Ceiling Mounting - The appliance should bemounted to a wall or ceiling only as recommended by themanufacturer.Ventilation - The appliance should be situated so that itslocation or position does not interfere with its proper ven-tilation. For example, the appliance s

5、hould not be situ-ated on a bed, sofa, rug, or similar surface that may blockthe ventilation openings; or, placed in a built-in installa-tion, such as a bookcase or cabinet that may impede theflow of air through the ventilation openings.Heat - The appliance should be situated away from heatsources s

6、uch as radiators, heat registers, stoves, or otherappliances (including amplifiers) that produce heat.Power Sources - The appliance should be connected to apower supply only of the type described in the operatinginstructions or as marked on the appliance.Grounding or Polarization - The precautions t

7、hat shouldbe taken so that the grounding or polarization means ofan appliance is not defeated.Power Cord Protection - Power supply cords should berouted so that they are not likely to be walked on orpinched by items placed upon or against them, payingparticular attention to cords at plugs, convenien

8、ce recep-tacles, and the point where they exit from the appliance.Cleaning - The appliance should be cleaned only as rec-ommended by the manufacturer.Nonuse Periods - The power cord of the appliance shouldbe unplugged from the outlet when left unused for a longperiod of time.Object and Liquid Entry

9、- Care should be taken so thatobjects do not fall and liquids are not spilled into the en-closure through openings.Damage requiring Service - The appliance should be ser-viced by qualified service personnel when:A.B.C.D.E.Servicing - The user should not attempt to service the ap-pliance beyond that

10、described in the operating instruc-tions. All other servicing should be referred to qualifiedservice personnel.REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.CAUTIONRISK OF ELECTRIC SHOCKDO NOT OPENCAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,DO NOT REMOVE COVER (OR BACK).NO USER-SERVICEABLE PARTS

11、INSIDE.TO PREVENT ELECTRIC SHOCK, MATCHWIDE BLADE OF PLUG TO WIDE SOLT,FULLY INSERT.POUR VITER LES CHOCS LECTRIQUES,INTRODUIRE LA LAME LA PLUS LARGE DELA FICHE DANS LA BORNE CORRE-SPONDANTE DE LA PRISE ET POUSSERJUSQU AU FOND.CAUTION:ATTENTION:The exclamation point within an equilateraltriangle is i

12、ntended to alert the user to thepresence of important operating and mainte-nance (servicing) instructions in the literatureaccompanying the appliance.The lightening flash with arrowhead symbol,within an equilateral triangle, is intended toalert the user to the presence of uninsulated“dangerous volta

13、ge” within the products en-closure that may be of sufficient magnitude toconstitute a risk of electric shock to persons.“WARNING”“TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK,DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS-TURE.”1.2.3.4.5.6.7.8.The power supply cord or the plug has been damaged;orObjec

14、ts have fallen, or liquid has been spilled into theappliance; orThe appliance has been exposed to rain; orThe appliance does not appear to operate normally orexhibits a marked changed in performance; orThe appliance has been dropped, or the enclosuredamaged.9.10.11.12.13.14.15.16.17.RadioFans.CN 收音机

15、爱 好者资料库Parts marked with this sign are safety critical components. They must always be replaced with identical components.Refer to the Fostex Parts List and ensure exact replacement.CAUTIONTABLE OF CONTENTS1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

16、.2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .3. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . .4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .5. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .Owners manual: 8288427000 (for e

17、xport & domestic model)AC adaptor AD-12C: 8270846003 (for USA/CND): 8270846006 (for EUR): 8270846007 (for UK): 8270846010 (for JPN)Adjusting Procedures, Parts List and circuit diagrams are given in this manual to assist the service technician inmaintaining the Model X-34.NOTESThe following accessori

18、es are supplied with X-34 as the standard accessories.*Following is the packing material for the Model X-34.*Carton, inner, X-34: 8228723000Packing, L, X-34: 8228448000Packing, R, X-34: 82284490003X-344781425!4X-341. SPECIFICATIONSDEFINITIONSpecification Unit0 dBV = 1 VrmsNormal Fader PositionInput

19、faderAt 70 90 % positionConditionLINE IN / INSERT: -10 dBV / 1 kHzRecorder: Input Monitor mode (REC - PAUSE)Adjust input fader for -10 dBV at TAPE OUT.Master faderAt 70 90 % positionConditionLINE IN / INSERT: -10 dBV / 1 kHzRecorder: Input Monitor mode (STOP)Adjust master fader for -10 dBV at LINE O

20、UT.PAN: L (R)MIXER SECTIONStandard InputMIC INConnectorPhone (unbalanced) / XLR-3 (balanced)Input level-50 -10 dBVImpedance10 k or moreLINE IN / INSERT (RTN)ConnectorStereo phone (tip)Input level-10 dBVImpedance10 k or moreAUX RTN L (MONO) / RConnectorPhoneInput level-20 dBVImpedance7 k or moreStand

21、ard OutputTAPE OUT 1 4 / LINE OUT L, RConnectorRCA pinOutput level-10 dBVLoad impedance10 k or moreMONITOR OUT L, RConnectorPhoneOutput level-10 dBVLoad impedance10 k or moreINSERT (SEND)ConnectorStereo phone (ring)Output level-10 dBVLoad impedance10 k or morePhones Max. Output Level20 mW or more (1

22、 kHz, 16 load)Level Indication5-dot LED meter X 6 (0 dB is indicated by 5-dot LED bargraph meterwhen input / output level is -10 dBV with the above standard input /master fader position settings.)Mic Gain40 2 dBDistortion(With 400 Hz HPF & 30 kHz LPF)0.05 % or less (Input: 1 kHz / 0 dBV signal, MIC

23、GAIN: LINE, LINEOUT: 0 dBV.)0.2 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN:LINE,PHONES: 3 mW / 16.)X-345MIXER SECTION (continued)Frequency ResponseMIC IN (Input Level: -50 dBV, MicGain: MIC)40 20 kHz 3 dB at LINE OUTMIC IN (Input Level: -10 dBV, MicGain: LINE)20 20 kHz 3 dB at LINE OUT (Mic Ga

24、in: LINE)MIC IN (Input Level: -10 dBV, MicGain: LINE)50 10 kHz 2 dB at PHONES (10 mW / 16 ) (Mic Gain: LINE)S / N (shorted by 150 resistor)MIC IN (Mic Gain: MIC)66 dB or more at LINE OUT (DIN AUDIO)68 dB or more at LINE OUT (IHF A)MIC IN (Mic Gain: LINE)73 dB or more at LINE OUT (DIN AUDIO)75 dB or

25、more at LINE OUT (IHF A)EQ Variable Range (HI: 10 kHz, LO: 100 Hz)Boost+12 3 dBCut-12 3 dBFader Attenuation70 dB or more at 1 kHz (from standard fader position)Crosstalk60 dB or more at 1 kHz (Input: MIC IN, Mic Gain: LINE, Output: SENDOUT. Measure level at non-input channel.)PAN Crosstalk42 dB or m

26、ore at 1 kHz (Input: MIC IN, Mic Gain: LINE, Output: LINEOUT. Measure level at non-input channel.)Click NoisePower on / off-20 dBVp-p or less at LINE OUT / MONITOR OUT / AUX SENDOther switching-30 dBVp-p or less at LINE OUT / MONITOR OUT / AUX SENDShock Noise-30 dBVp-p or less (Measure noise level w

27、hen one side of appliance isdropped 3 times from 5 cm height.)RECORDER SECTIONTape SpeedNORMAL FIX SW: OFF9.5 cm/s 1.5 % (3000 Hz 45 Hz, TCW-211 test tape)NORMAL FIX SW: ON4.75 cm/s 1.5 % (3000 Hz 45 Hz, TCW-111 test tape)Wow & FlutterPLAY0.25 % or less (TCW-211 test tape, ANSI WTD.)REC & PLAY0.30 %

28、 or less (AC-514 test tape, ANSI WTD.)Pitch ControlMIN (PITCH VR: Fully CCW)-45 % or less (TCW-211 test tape)MAX (PITCH VR: Fully CW)+12 % or more (TCW-211 test tape)Fast Winding Time (FF / RWD)150 20 sec. (TAPE: C-60)Tape Counter Deviation0 7 (FF from BOT to EOT and then RWD to BOT again.)Standard

29、LevelPLAY (NR: OUT)-10 1 dB (TCW-231 test tape)REC & PLAY (NR: OUT)-10 1 dBV (AC-514 test tape)Level difference between channels1 dB or lessFrequency responsePLAYTest tape: SCW-977 / TCW-284F (NR: OUT)+3 dB-3 dB400 Hz12.5 kHz40 Hz6X-34* Specifications and appearance are subject to change without not

30、ice for product improvement.RECORDER SECTION (continued)REC & PLAYTest tape: AC-514 (NR: OUT, recording level: 0 dB)Test tape: AC-514 (NR: IN, recording level: -25dB)Level Deviation at Ref. Output LevelPLAY1 dB or less at 400 Hz (NR: OUT, TCW-231 test tape)3 dB or less at 40 HZ 12.5 kHz (NR: OUT, SC

31、W-977 / TCW-284F testtape)REC & PLAY1 dB or less at 400 Hz (NR: OUT, AC-514 test tape)2 dB or less at 100 Hz 10 kHz (NR: OUT, AC-514 test tape)S/NPLAY47 dB or more (NR: OUT, DIN AUDIO)55 dB or more (NR: OUT, IHF-A)REC & PLAY45 dB or more (NR: OUT, DIN AUDIO)48 dB or more (NR: OUT, IHF-A)48 dB or mor

32、e (NR: IN, DIN AUDIO)55 dB or more (NR: IN, IHF-A)Distortion (with 400 Hz HPF & 30 kHz LPF)(REC & PLAY)2 % or less (Input signal: 1 kHz / standard level, standard fader position,REC SEL: All track )Erasure Ratio67 dB or more at 1 kHz (Input signal: 1 kHz / 0 dBV, standardfaderposition, with 1 kHz BP

33、F)Cross Erasure1 dB or less (Input signal: 10 kHz / -10 dBV, standard fader position.Measure level difference when adjacent track is put into REC mode.)Channel Separation50 dB or more (Input signal: 1 kHz / -10 dBV, standard fader position,with 1 kHz BPF. Measure leakage level when adjacent track is

34、 put intoREC mode.)Sync Crosstalk-25 dBV or less (Input signal: 1 kHz / -10 dBV)-10 dBV or less (Input signal: peak frequency / -10 dBV)(Measure leakage level when adjacent track is put into REC mode.)Bias Leakage-35 dBV or less (No LED meter should not be lit. Standard fader position.Measure leakag

35、e level at TAPE OUT when unit is put into REC mode.)Click NoisePLAY STOP-30 dBVp-p or less (No tape is loaded.)REC STOPMonitor-20 dBVp-p or less (AC-514 test tape)PLAY-20 dBVp-p or less (AC-514 test tape)Punch In / Out-30 dBVp-p or less at PLAY (AC-514 test tape)Shock Noise-30 dBVp-p or less (Measur

36、e playback noise level when one side ofappliance is dropped 3 times from 5 cm height.)12.5 kHz250 Hz5 dB10 kHz6 dB+3 dB-3 dB400 Hz12.5 kHz40 HzX-3472. CONTROLS, INDICATORS & CONNECTORS1. Input/playback level control faders2. Master fader MASTER3. Record track select switches REC TRK4. Record track i

37、ndicators5. Auto Bounce indicators6. Pan pot knobs PAN7. Monitor / AUX send level control knobsMON MIX/AUX8. Equalizer control knobs EQ HI, EQ LO9. Trim knobs10. AUX return knob AUX RTN11. Monitor master knob MONITOR12. AUX indicator AUX13. MON MIX indicator MON MIX14. Track down on / off button Tra

38、ck Down15. Track down indicator16. Auto bounce select button Auto Bounce17. Level meters18. Dolby B noise reduction indicator NR19. Record indicator REC20. Power indicator POWER21. Pitch control knob WIDE PITCH22. Tape speed control / knob NORMAL FIX23. Tape counter / reset button RESET24. Cassette

39、lid / Cassette tray25. Transport control buttonsPlay button PLAYStop button STOPFast forward button FFRewind button REWRecording button RECPause button PAUSE000LINE OUTRLMONITOR OUTRLAUX RTNRL/MONOAUX SEND2/41/3MIC INTRIM 2/4TRIM 1/3RESET+WIDE PITCH4321RLFIXNORMALPOWERRECNR-+105036-10503+6PAUSESTOPF

40、FRECPLAYREWX-34multitrackerDOLBY B NR100100MONITORAUX RTNMON MIXAUX+-0+-0RL100+-0+-0RL100+-0+-0RL100+-0+-0RL100AUXEQ HIEQ LOMON MIX/PAN123412341234REC TRKREC TRKREC TRK432REC TRK12341LINE IN/INSERT1234MASTERDownTrackBounceAuto1225151416345678910 1117212218, 19, 20231213248X-341. Line in / insert jac

41、ks jacks LINE IN/INSERT 1, 2, 3, 42. Headphone jack PHONES1. Mic inut jacks MIC IN 1/3, 2/42. AUX send jack AUX SEND3. AUX return jacks AUX RTN (L/MONO, R)4. Monitor out jacks MONITOR OUT (L, R)5. Line out jacks LINE OUT L, R6. Tape out jacks TAPE OUT 1, 2, 3, 47.Dolby B noise reduction on / off swi

42、tchDOLBY NR ON/OFF8.Power switch ON-STANDBY9.DC IN connector DC IN 12V10. Pinch in / out jack PUNCH IN/OUT1 123. ADJUSTING PROCEDURESWith constant use, the head surface becomes soiled with magnetic particles from the tape, dirt and dust. Under suchconditions, the tape will not always be in smooth co

43、ntact with the head and thus result in poor performance. Lessoutput in the high region and dropout (some parts of sound not reproduced) are typical symptoms. It is thereforerecommended to clean the heads periodically before recording and playback to avoid such troubles.3-1. Routine Maintenance3-1-1.

44、 Cleaning1) HeadPUNCHIN/OUT12VDC INONSTANDBYOFFONDOLBY NRTAPE OUT1234109876123452 (HOT)3 (COLD)1 (GND)2) Capstan and pinch rollerBuildup of magnetic particles and dust on these parts will cause increase in wow, flutter and wrapping of tape onthe capstan. Thus, these parts must always be kept clean.

45、Cleaning is done with cotton buds moistened with fluidsprescribed or recommended for tape recorders and especially the heads. Never use lacquer thinner, acetone orother organic solvents.X-3493-1-2. DemagnetizingThe REC/PLAY head becomes magnetized by extended use or when the head is touched with a m

46、agnetized object.As a result, frequency response especially in the high region will deteriorate, noise level increases, and in somecases may transfer noise to valuable prerecorded tapes. For this reason, do not touch the head with magnetizedscrewdriver and scissors or allow DC current to flow throug

47、h the head winding such as when testing continuitywith a circuit tester. Should the head becomes magnetized, demagnetize it with a head demagnetizer designed forthis purpose.Demagnetizing ProceduresAfter turning off the power of Model X-34, open the cassette lid and if a cassette tape is loaded, rem

48、ove and placeit far away from the deck.Switch on the head demagnetizer while holding it about one meter away from the Model X-34. Then, slowly movethe head demagnetizer tip to the head and wave the tip up and down several times close to the head surface.On completing the above procedures, slowly dra

49、w the demagnetizer away from the head and switch it off when itis more than one meter away from the head. As demagnetizm in the head cannot be seen, unlike the soiled head,routine demagnetizing is necessary. It is recommended to do so at the same time the head is cleaned.1)2)3)3-2. Test Equipment an

50、d Adjusting ToolsThe following tools and equipment are required for adjusting the Model X-34.Head height and tape contact adjusting jigModel 9001 (P/N: 8286001000)Torque meterCassette torque meterTW-2231 (P/N: 8286008000): 0 200 g-cm (0 2.8 Oz-In)Cassette torque meterTW-2111A (P/N: 8286009000): 0 10