Yamaha-MT400-mcr-sm 维修电路原理图.pdf

SERVICE MANUALPA01143719981101-45000 1.95K-998 Printed in Japan 98.10HAMAMATSU, JAPAN CONTENTSSPECIFICATIONS. 3/4DIMENSIONS. 4PANEL LAYOUT. 5CIRCUIT BOARD LAYOUT. 8BLOCK DIAGRAM. 9DISASSEMBLY PROCEDURE. 10IC BLOCK DIAGRAM. 11CIRCUIT BOARDS. 12INSPECTIONS. 15/17TROUBLE SHOOTING. 19CIRCUIT DIAGRAM. 21PARTS LIST44TR4STEREO+6+30510+6+30510POWERAUX SENDSTEREO INPUTMETER SELECTREC SELECTMONITOR/PHONESZERO STOPPITCHNOISE REDUCTION SYSTEMTAPE SPEED CONTROL321RLRECRECPLAYREWFFSTOPPAUSEOFFR3OFFL2OFFR1OFFLONOFFONOFFSYNCSTEREOST+CUECUEMULTITRACK CASSETTE RECORDERMIC/LINE INPUTINSERT I/OINSERT I/O1212345L6R8R7L4.8/ 9.5+LEVELSTEREO7L8R010LEVEL5L6R010LEVELMINMAX109876543210GAINHIGH109876543210LINEMIC12+12MID12+12LOW12+12AUX1010AUX2MIXCUEMIXCUEMIXCUEMIXCUE010010PANINPUT-FLIPTAPETAPEMIC/LINEMIC/LINEto LLR1GAINHIGH109876543210LINEMIC12+12MID12+12LOW12+12AUX1010AUX2010010PANINPUT-FLIPTAPETAPEMIC/LINEMIC/LINEto RLR2GAINHIGH109876543210LINEMIC12+12MID12+12LOW12+12AUX1010AUX2010010PANINPUT-FLIPTAPETAPEMIC/LINEMIC/LINEto LLR3GAINHIGH109876543210LINEMIC12+12MID12+12LOW12+12AUX1010AUX2010010PANINPUT-FLIPTAPETAPEMIC/LINEMIC/LINEto RLR4MULTITRACK CASSETTE RECORDERRadioFans.CN 收音机爱 好者资料库IMPORTANT NOTICEThis manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumedthat basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and under-stood by the users, and have therefore not been restated.WARNING :Failure to follow appropriate service and safety procedures when servicing this product may result in per-sonal injury, destruction of expensive components and failure of the product to perform as specified. Forthese reasons, we advise all Yamaha product owners that all service required should be performed by anauthorized Yamaha Retailer or the appointed service representative.IMPORTANT :This presentation or sale of this manual to any individual or firm does not constitute authorization certifi-cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship ofany form.The data provided is belived to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, andservice departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitableand changes in specification are subject to change without notice or obligation to retrofit. Should any discrepancy appear toexist, please contact the distributors Service Division.WARNING :Static discharges can destroy expensive components. Discharge any static electricity you body may haveaccumulated by grounding yourself to the ground buss in the unit (heavy gauge black wires connect tothis buss.)IMPORTANT :Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply powerto the unit.WARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/or plastic (Whereapplicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possiblyother entities) to cause cancer and/or birth defects or other reproductive harm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY REASON WHATSO EVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or exposeeyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handlingfood.WARNINGComponents having special characteristics are marked and must be replaced with parts having specification equal to thoseoriginally installed.MT4002RadioFans.CN 收音机爱 好者资料库SPECIFICATIONS3MT400DC 12V (650 mA or higher)388 x 102 x 354 mm2.8 kgAC adapter KPA4N, KPA6NC4690 cassette tapes (Type II)4-track/4-channel, One-way Record-Play4-track Record-Play, Hard Permalloy x 1, 4-track Erase, Ferrite x1DC servo motor x14.8 cm/s, 9.5 cm/sApproximately+/10%0.12% WRMS (9.5 cm/s)Approximately 120 seconds for a C60 tapeMixerPower RequirementDimensions (WxHxD)WeightOption for UK modelEQLOW/ShelvingBasic frequency: 80 Hz, Range: 12 dBMID/PeakingBasic frequency: 1 kHz, Range: 12 dBHIGH/ShelvingBasic frequency: 12 kHz, Range: 12 dBTape TypeTrack ConfigurationTape HeadsMotorTape SpeedPitch ControlWow & FlutterRewind TimeRecorderOverall Frequency ResponseOverall S/N RatioOverall DistortionErasure RateNoise Reduction50 Hz14 kHz, +3/5 dB (9.5 cm/s, NR OUT)80 dB/IHF-A (NR IN) at 3% distortion level2.0% (400 Hz, 10 dB)55 dB (1 kHz, 0 dB, BPF)dbx TYPE IIConnections# of I/OsMIC/LINEx4INSERT I/Ox2STEREO INx2AUX SENDx2STEREO OUT L, Rx1MONITOR OUT L, R x1SYNC OUTx1PHONES L, Rx1I/O SpecificationsINSERT OUT CH 1, 2Output Impedance: 100ohmRated Load Impedance: 10 k or higherRated Output Level: 10 dB (10 k load)PHONES (STEREO)Rated Load Impedance: 8 to 40ohmRated Output Level: 30 mW+30 mW (40ohm load)Control JackPUNCH I/OFoot switch: FC5 (optional)General0 dB=0.775 Vrms.Tape TransportFrequency ResponseS/N Ratio (at rated input &output levels)20 Hz20 kHz, +1/4 dB, MIC INSTEREO OUTLINE INMONITOR OUT65 dB/IHF-A, MIC INSTEREO OUT (GAIN TRIM MAX)70 dB/IHF-A, LINE INSTEREO OUT (GAIN TRIM MIN)MIC/LINEINSERT IN CH 1, 2STEREO INInput Impedance: 10 k ohmRated Input Level: 10 to 50 dB (CH fader at rated levels)Minimum Input Level: 56 dB (Gain trim max. CH fader max)Input Impedance: 10 k ohmRated Input Level: 10 dB (CH fader at rated levels)Minimum Input Level: 16 dB (CH fader max)Input Impedance: 10 k ohmRated Input Level: 10 dB (CH fader at rated levels)Minimum Input Level: 16 dB (Volume max)STEREO OUT L, RAUX SENDMONITOR OUTSYNC OUTOutput Impedance: 1 k ohmRated Load Impedance: 10 k ohm or higherRated Output Level: 10 dB (10 k ohm load)Output Impedance: 1 k ohmRated Load Impedance: 10 k ohm or higherRated Output Level: 10 dB (10 k ohm load)Output Impedance: 1 k ohmRated Load Impedance: 10 k ohm or higherRated Output Level: 10 dB (10 k ohm load)Output Impedance: 1 k ohmRated Load Impedance: 10 k ohm or higherRated Output Level: 10 dB (10 k ohm load)4MT400Unit : mmDIMENSIONSH:102D:354W:388MT4005LEVEL7L8R010LEVEL5L6R0108MONITOR/PHONESSTEREOST+CUECUESTEREOLEVELMINMAX10987654321091011GAINHIGH109876543210LINEMIC12+12MID12+12LOW12+12AUX1010AUX2MIXCUE010010PANINPUT-FLIPTAPETAPEMIC/LINEMIC/LINEto LLR11234567MONITOR LEVEL controlMONITOR select switchSTEREO fader91011PANEL LAYOUT Input channelsGAIN controlEQ controlAUX controlsCUE controlINPUT-FLIP switchPAN controlFader1234567 Stereo InputLEVEL controls8 Monitor / Master SectionMT4006121314151617181920PITCH controlTape speed switchREC SELECT switchesMETER SELECT switchdbx switchZERO STOP switchTape counterCounter reset buttonCassette compartment Recorder Section Transport Section4TR4STEREOMETER SELECTREC SELECTZERO STOPPITCHNOISE REDUCTION SYSTEMTAPE SPEED CONTROLOFFR3OFFL2OFFR1OFFLONOFFONOFFSYNC4.8/ 9.5+121314151617181920RECPLAYREWFFSTOPPAUSE212223242526 button ( )PLAY button ( )REW button ( )FF button ( )STOP button ( )PAUSE button ( )212223242526RECMT40073637383940POWER ON/OFF switchDC 12VSYNC OUTMONITOR OUTsSTEREO OUTs303132334+6+30510+6+30510POWER321RLREC272829 Meter SectionAUX SENDSTEREO INPUTMIC/LINE INPUTINSERT I/OINSERT I/O1212345L6R8R7L31323033PHONESPUNCH I/O3435SYNC OUTMONITOR OUTSTEREO OUTRLRLDC 12VPOWERON/OFF3637383940 Input / Output Section Front Panel Rear PanelLevel metersREC SELECT indicatorPOWER indicator272829MIC/LINE INPUTs 1-4INSERT I/OSTEREO INPUTsAUX SEND3435PHONESPUNCH I/OMT4008MIX 1/3SUB 1/3SUB 3/3MIX 3/3REC 1/2SUB 2/3MIX 2/3REC 2/2CIRCUIT BOARD LAYOUT9BLOCK DIAGRAMMT400IC10131IC10327IC10431IC20131IC30327IC10531IC106IC107IC110IC110IC111IC108IC109 216721672167216721316767MT400-3000 010DISASSEMBLY PROCEDUREFig.1MT400320:Bind Head Tapping Screw-P 3X10 MFZN2BL (EP630660)3203201.Lower Case1-1Remove the seven (7) screws marked 320. Thelower case can then be removed. (Fig.1)4.SUB 2/3, 3/3 Circuit Boards4-1Remove the lower case. (See Procedure 1.)4-2Remove the three (3) screws marked 320d andthe two (2) screws marked 320e.The SUB2/3 circuit board can then be removed.(Fig.2, Fig.3)4-3Remove the four (4) screws marked 320f. The SUB3/3 circuit board can then be removed. (Fig.2)2.Cassette Mechanism2-1Remove the lower case. (See Procedure 1.)2-2Remove the five (5) screws marked 320a. Thecassette mechanism can then be removed. (Fig. 2)3.REC 1/2, 2/2 Circuit Boards3-1Remove the lower case. (See Procedure 1.)3-2Remove the cassette mechanism. (See Procedure 2.)3-3Remove the six (6) screws marked 320b. The REC1/2 circuit board can then be removed. (Fig.2)3-4Remove the two (2) screws marked 320c. The REC2/2 circuit board can then be removed. (Fig.2)320e320f320b320a320c320b320c320a320b320b320b320f320dREC 1/2SUB2/3SUB3/3Fig.2Fig.3REARFRONTREARFRONTBottomTop11Fig.4MT40011A2345671Y2A2Y3A3YVSS891011121314VDD6A6Y5A5Y4A4YTC4069UBP(IG001720) Hex Inverter1Input (Output)1234567Output (Input)1Output (Input)2Input (Output)2Control2Control3VSS891011121314VDDControl1Control4Input (Output)4Output (Input)4Output (Input)3Input (Output)3TC4066BP(IX631591) Quad Bilateral SwichBA7755A(XH519A00) Head SwitcherBA6137(XA534A00) LED DriverAN6292NK(XJ637A00) Dual dbx NRNJM2068LD(XM356A00) NJM4558L(IX614610) M5216L(XB419A00) M5218AL(XH471A00)Dual Operational Amplifier 1A2345678INV+INOUTAAA+VIN+INOUTBBB+B+12345VCCSWGNDCTRL1CTRL2D1+ConstantCurrentCircuit1D22D33D44GND5D56AmpOutput7IN8VCC9389202126ENPHASISBAND PASS FILTER INREC OUT128GND+227R/P INR/P INENPHASIS4LINE OUTLINE OUT524ENPHASISENPHASIS623CCA-A OUTCCA-A OUT722CCA-B INCCA-B INBAND PASS FILTER INREC OUT1019BAND PASS FILTER OUTBAND PASS FILTER OUT11131618LEVEL SENSOR INTIMING CURRENT ADJ.LEVEL SENSOR IN1217TIMING CAP.TIMING CAP.DECODE / ENCODE SW1415SWB CH.A CH.+DEOFFLINE AMP.OFFENENDE+DEOFFBUFFERENENOFFOFFDEDEEN+ENCCA-BCCA-AREC OUT AMP.OFFLEVEL SENSOROFFDEDEEN+EN PHASIS AMP.25IC BLOCK DIAGRAM5.SUB 1/3 Circuit Board5-1Remove the lower case. (See Procedure 1.)5-2Remove the PITCH knob of the TAPE SPEEDCONTROL on the upper case and the six (6) screwsmarked 320g.The SUB 1/3 circuit board can then be removed.(Fig.4)6.MIX 1/3 Circuit Board6-1Remove the lower case. (See Procedure 1.)6-2Remove the SUB 1/3 circuit board. (See Procedure 5.)6-3Remove the knob on the upper case and the twelve(12) screws marked 320h.The MIX 1/3 circuit board can then be removed.(Fig.4)7.MIX 2/3, 3/3 Circuit Boards7-1Remove the lower case. (See Procedure 1.)7-2Remove the four (4) screws marked 320I on theplate. The plate with the MIX 2/3 and 3/3circuitboards can then be removed. (Fig.4)7-3Remove the holding plate of each jack. The eachcircuit board can then be removed.320h320hMIX 1/3320iMIX 2/3320h320gSUB 1/3320gMIX 3/3320iFRONTREAR12MT400to REC 1/2-CN504to SUB 1/3-CN101to MIX 3/3-CN110to MIX 2/3-CN109to SUB 2/3-CN107to MIX 2/3-CN112to MIX 2/3-CN108to SUB 1/3-CN102CIRCUIT BOARDS MIX-1/3 Circuit BoardComponent sideMIX : MT400-3400from MIX 1/3-CN1011-INSERT I/OMIC / LINE INPUT2-INSERT I/Ofrom MIX 1/3-CN111to MIX 1/3-CN10912345L6R7L8RSTEREO INPUTfrom MIX 1/3-CN10312AUX SENDSYNCOUTfrom MIX 1/3-CN104from REC 1/2-CN507LRSTEREO OUTLRMONITOR OUTto REC 1/2-CN506DC INPOWER SW.to REC 1/2-CN501to REC 1/2-CN502from MIX 1/3-CN106from MIX 1/3-CN10713MT400 MIX-2/3 Circuit BoardComponent side MIX-3/3 Circuit BoardComponent side SUB-1/3 Circuit BoardComponent side SUB-2/3 Circuit BoardComponent side SUB-3/3 Circuit BoardComponent sideMIX : MT400-3400SUB : MT400-360014from REC 1/2-CN503PUNCH I/OPHONESto REC 2/2-CN508from SUB 1/3-CN104from SUB 3/3-CN109from SUB 1/3-CN103to SUB 2/3-CN108from MIX 1/3-CN105MT400 REC-1/2 Circuit BoardComponent side REC-2/2 Circuit BoardComponent sideREC : MT400-3500MT40015INSPECTIONSA. Preparation1. Set UpSet the level controls and switches as follows (unless otherwise specified).1-1 CH 1, 2, 3, 4GAIN VOLUMELINEEQ/ HIGH, MID, LOW VOLUMECENTERAUX 1, 2 VOLUMEMINIMUMCUE VOLUMEMINIMUMINPUT FLP SWITCHMIC/ LINEPAN VOLUMECENTERCH FADERMINIMUM1-2 CH 5/6, 7/8LEVEL VOLUMEMINIMUM1-3 MASTERMASTER FADERMINIMUMMONITOR LEVEL VOLUMEMINIMUMMONITOR SELECT SWITCHSTEREO1-4 RECORDERREC SELECT SWITCHOFFdBx SWITCHOFF1-5 MECHANISMPITCH CONTROL VOLUMECENTERTAPE SPEED SWITCH9.5 cm/secZERO STOP SWITCHOFF1-6 OTHERMETER SWITCH4TR2. Input /OutputThe handled signal level is assumed to be 0 dB = 0.775 V.The input levels should be sine wave 1 kHz and -10 dBm, unless otherwise specified. Each output terminal should have the followingload resistance.STEREO OUT10 kohmMONITOR OUT10 kohmAUX OUT10 kohmSYNC OUT10 kohmPHONES (STEREO)40 ohm3. Position of CH / MASTER FADERWhen the input levels for each channel are as specified, the CH FADER is positioned so that the ST/OUT (L/R) is at -10 dBm and thepointer is between 7 and 8.4. TapesAlignment tapeTDK:AC514 (VU167300)MAXELL: UD II U60Test tapeA.BEX:TCC-121(TX911840) 315 Hz, -4 dB, 160 nWb / mA.BEX:TCC-151(TX800460) 6.3 kHzA.BEX:TCC111(TX911820)3 kHz, -10 dBA.BEX:TCW211(TX911550) 1.5 kHz, -4 dBMT400165. Test equipment requiredLow Frequency OscillatorAC voltmeter (level meter)DC voltmeterOscilloscopeFrequency CounterMirror Cassette SONY:MC112C (TX911100)Torque meter SONY:TW-2231 (TX913450), etc.6. Mechanical adjustment6-1 Tape runningCheck that a tape curl is not created when playing the mirror tape.When a tape curl occurs, adjust the height of the head after attaching a Y washer.6-2 Torque checkCheck that the torque of each measurement is within the standard listed below by using a torque meter.MeasurementModeStandardFF torqueFF55 120 gcmREW torqueREW55 120 gcmPLAY torquePLAY30 60 gcmBT torquePLAY1 6 gcmAdjustmentsTestTapeTestEquipmentModeConditionTestPointAdjustingPointStandard1dBxvoltage-DCVoltmeter-TP101TP201TP301TP401VR103VR203VR303VR40318.4 +/- 0.2 mV + -2Tape speed TCW-211TCC-111FrequencycounterPLAY 9.5 cm check shouldhave the priorityMONIT-OR OUTVR501(9.5 cm)VR502(4.8 cm)3000 +10 / -0 Hz3Azimuthand phaseTCC-151 ACVoltmeterOscilloscopePLAY INPUT-FILP: TAPEFADER-3,4: MAXPAN-3: L, PAN-4: RMONIT-OR OUTAzimuthadjustingscrewOutput: maximumPhase: in-phase4PlaybacklevelTCC-121TCC-151ACVoltmeterOscilloscopePLAY TAPE SPEED: 9.5 cm TP601-1PTP601-2PTP601-3PTP601-4PTP601-1PTP601-2PTP601-3PTP601-4PVR101VR201VR301VR401VR102VR202VR302VR402285 +/- 10 mV135 mV (-15 +/- 3 dBm)5Biasfrequency-FrequencycounterREC /PAUSETP501L50180 +/- 1 k Hz6Biasoscillationwaveform-OscilloscopeREC /PAUSETP102TP202TP302TP402L104L204L304L404Position the waveform recess atthe center. + -7RecordingBiasAlignmenttapeACVoltmeterOscilloscopeRECTAPE SPEED: 9.5 cmInput frequency: 1 k Hz 14 k HzOutput level: -30 dBmCH1CH2CH3CH4VR105VR205VR305VR405Adjust the output level of 14kHz to the same level as theoutput level of 1 k Hz.8RecordinglevelAlignmenttapeACVoltmeterOscilloscopeRECPLAYTAPE SPEED: 9.5 cmInput frequency: 1 k HzOutput level: 285 mVRecord and play in thecondition above.CH1CH2CH3CH4VR104VR204VR304VR404285 +/- 10 mV7. Electrical adjustmentsMT40017MT400