Fostex-X24-mt-sm维修电路原理图.pdf

X-24Service 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 - All 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 basement, 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 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 should 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 such 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 that 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, convenience 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 - 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 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 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 intended 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 voltage” 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;orObjects 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . .3. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . .4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . .5. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .Owners manual: 8288418000 (for export & domestic model)AC adaptor AD-12A: 8270727003 (for USA/CND): 8270727006 (for EUR): 8270727007 (for UK): 8270727010 (for JPN)Adjusting Procedures, Parts List and circuit diagrams are given in this manual to assist the service technician inmaintaining the Model X-24.NOTESThe following accessories are supplied with X-24 as the standard accessories.*Following is the packing material for the Model X-24.*Carton, inner, X-24: 8228715000Packing, L, X-24: 8228439001Packing, R, X-24: 82284390023X-244781423!4X-241. SPECIFICATIONSDEFINITIONSpecification Unit0 dBV = 1 VrmsNormal Fader PositionInput faderAt 8 1 positionConditionLINE IN / INSERT: -10 dBV / 1 kHzRecorder: Input Monitor mode (REC - PAUSE)Adjust input fader for -10 dBV at TAPE OUT.PAN: L (R)Master faderAt 8 1 positionConditionLINE IN / INSERT: -10 dBV / 1 kHzRecorder: Input Monitor mode (STOP)Adjust master fader for -10 dBV at LINE OUT.PAN: L (R)MIXER SECTIONStandard InputMIC INConnectorPhone (unbalanced) / XLR (balanced)Input level-50 -10 dBVImpedance10 k or moreLINE IN / INSERT (RCV)ConnectorStereo phone (tip)Input level-10 dBVImpedance10 k or moreStandard OutputTAPE OUT 1 4ConnectorRCA pinOutput level-10 dBVLoad impedance10 k or moreLINE OUT L, RConnectorRCA pinOutput 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 kHz, 16 load)Level Indication0 dB is indicated by 5-dot LED bargraph meter when input / outputlevel is -10 dBV with the above standard input / master faderposition settings.Frequency ResponseMIC IN (Input Level: -50 dBV)40 20 kHz 3 dB at LINE OUTMIC IN (Input Level: -10 dBV)20 20 kHz 3 dB at LINE OUTLINE IN (Input Level: -10 dBV)50 10 kHz 2 dB at PHONES (10 mW / 16 )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 more at LINE OUT (IHF A)X-245MIXER SECTION (continued)Distortion(With 400 Hz HPF & 30 kHz LPF)0.05 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN: LINE, LINEOUT: 0 dBV.)0.2 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN:LINE,PHONES: 3 mW / 16.)Fader Attenuation70 dB or more at 1 kHz (from standard fader position)Crosstalk60 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: SENDOUT. Measure level at non-input channel.)PAN Crosstalk42 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: LINEOUT. Measure level at non-input channel.)Click NoisePower on / off-20 dBVp-p or lessOther switching-30 dBVp-p or lessShock Noise-30 dBVp-p or less (Measure noise level when one side of appliance isdropped 3 times from 5 cm height.)RECORDER SECTIONTape Speed9.5 cm/s 1.5 % (3000 Hz 45 Hz when reproducing TCW-211 testtape.)Wow & FlutterPLAY0.25 % or less (TCW-211 test tape, ANSI WTD.)REC & PLAY0.30 % 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 LevelPLAY-10 1 dB (TCW-231 test tape)REC & PLAY-10 1 dBV (AC-514 test tape, 1 dB or less of level difference betweenchannels is also required.)Frequency responsePLAYTest tape: SCW-977 / TCW-284F (NR: OUT)REC & PLAYTest tape: AC-514 (NR: OUT, recording level: 0 dB)Test tape: AC-514 (NR: IN, recording level: -25dB)+3 dB-3 dB400 Hz12.5 kHz40 Hz+3 dB-3 dB400 Hz12.5 kHz40 Hz12.5 kHz250 Hz5 dB10 kHz6 dB6X-24Specifications and appearance are subject to change without notice for product improvement.RECORDER SECTION (continued)Level Deviation at Reference 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, SCW-977 /TCW-284F test tape)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 more (NR: IN, DIN AUDIO)55 dB or more (NR: IN, IHF-A)Distortion (REC & PLAY)2 % or less (Input signal: 1 kHz / standard level, standard fader position,with 400 Hz HPF & 30 kHz LPF)Erasure Ratio67 dB or more at 1 kHz (Input signal: 1 kHz / 0 dBV, standardfaderposition, with 1 kHz BPF)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 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 is lit. Standard fader position.Measure leakage level at TAPE OUT when unit is put into REC mode.)Click NoisePLAY STOP-30 dBVp-p or lessREC STOPMonitor-20 dBVp-p or lessPLAY-20 dBVp-p or lessPunch In / Out-30 dBVp-p or less at PLAYShock Noise-30 dBVp-p or less (Measure playback noise level when one side ofappliance is dropped 3 times from 5 cm height.)X-2472. CONTROLS, INDICATORS & CONNECTORS1234POWERREC6+305-106+305-106+305-106+305-10REC SELREC SELREC SELREC SELPANINPUT/PLAYBACK LEVELAutoBounce000RECREWFFSTOPPAUSEPLAYLR4DC IN12VONSTANDBYOFF ONDOLBY NRRESETL3L2L1RRRMASTERMIC IN2/41/3RL4321LINE OUTLINE IN/INSERT-+WIDE PITCHDOLBY B NRREHEARSAL1. Master fader MASTER2. Input/playback level control fadersINPUT/PLAYBACK LEVEL3. Pan pot knob PAN4. Record track select switches REC SEL5. Record track LED6. Level meter7. Pitch control knob WIDE PITCH8. Tape counter/reset button RESET9. Cassette lid/Cassette tray10.Transport control buttonsPlay button PLAYStop button STOPFast forward button FFRewind button REWRecording button RECPause button PAUSE11. Power LED POWER12. Record LED REC13. Auto bounce on/off button Auto Bounce14. Auto bounce LED15. Trim knob8X-241. Mic input jacks MIC IN 1/3, 2/42. Headphone jack PHONES3. Punch in/out jack PUNCH IN/OUTPUNCHIN/OUTPHONES2 (HOT)3 (COLD)1 (GND)1234TAPE OUT1. Line out jacks LINE OUT L, R2. Line in/insert jacks LINE/INSERT 1, 2, 3, 43. Tape out jacks TAPE OUT 1, 2, 3, 44. Dolby B noise reduction on/off switchDOLBY NR ON/OFF5. Power switch ON-STANDBY6. DC IN connector DC IN 12V3. 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 contact with the head and thus result in poor performance. Less3-1. Routine Maintenance3-1-1. Cleaning1) HeadX-2492) 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. 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.3-1-2. DemagnetizingThe REC/PLAY head becomes magnetized by extended use or when the head is touched with a magnetized 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 through 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-24, open the cassette lid and if a cassette tape is loaded, remove and placeit far away from the deck.Switch on the head demagnetizer while holding it about one meter away from the Model X-24. 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 draw 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 and Adjusting ToolsThe following tools and equipment are required for adjusting the Model X-24.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): 0 100 g-cm (0 1.4 Oz-In)Mirror tape cassetteTCC-902 (P/N: 8286002000)Test tapeSpeed / Flutter (3 kHz)Model 9152 (P/N: 82660022000)Also 3150 Hz test tape for Wow & Flutter measurement isrecommended.Reference playback levelTCW-231 (P/N: 8266002000)Playback frequency responseTCW-284F (P/N: 8266003000)Blank tapeC-90 or shorter tape, TYPE II / HIGH positionAudio oscillatorGeneral typeFrequency counterGeneral typeBandpass filterGeneral typeAC voltmeterStereo type is recommended.OscilloscopeGeneral typeWow & Flutter meterGeneral typeDistortion meterGeneral typeFrequency counterGeneral type1)2)3)4)5)6)7)8)9)10)11)12)13)output 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.10X-243-3. Tape Transport Mechanical Data3-3-1. Reel torquePLAY mode (TW-2111A)Supply: 1.5 6 g-cmTakeup: 20 70 g-cmFF/REW mode (TW-2231)FF /REW: 60 120 g-cm1)2)3-3-2. Pinch roller pressurePull force300 500 g3-4. Tape Travel Check and AdjustmentUsing the mirror type cassette, check to see that the tape is running stable between the ERASE and REC/PLAYheads tape guides without weaving. If the tape is not running stable between the guides, erasure and frequencyresponse will be affected or the tape will be damaged by curling. It then becomes necessary to check the guideheight,