Yamaha-YSTSW800-sub-sm 维修电路原理图.pdf

YST-SW800YST-SW800This manual has been provided for the use of authorized YAMAHARetailers and their service personnel.It has been assumed that basic service procedures inherent to the industry,and more specifically YAMAHA Products, are already known andunderstood by the users, and have therefore not been restated.WARNING:Failure to follow appropriate service and safetyprocedures when servicing this product may result inpersonal injury, destruction of expensive components,and failure of the product to perform as specified. Forthese reasons, we advise all YAMAHA product ownersthat any service required should be performed by anauthorized YAMAHA Retailer or the appointed servicerepresentative.IMPORTANT:The presentation or sale of this manual to any individualor firm does not constitute authorization, certificationor recognition of any applicable technicalcapabilities, or establish a principle-agent relationshipof any form.The data provided is believed to be accurate and applicable to the unit(s)indicated on the cover. The research, engineering, and service departmentsof YAMAHA are continually striving to improve YAMAHA products.Modifications are, therefore, inevitable and specifications are subject tochange without notice or obligation to retrofit. Should any discrepancyappear to exist, please contact the distributors Service Division.WARNING:Static discharges can destroy expensive components.Discharge any static electricity your body may haveaccumulated by grounding yourself to the ground bussin the unit (heavy gauge black wires connect to thisbuss).IMPORTANT:Turn the unit OFF during disassembly and partreplacement. Recheck all work before you apply powerto the unit.IMPORTANT NOTICE100721SERVICE MANUALYST-SW800SUBWOOFER SYSTEMI CONTENTSTO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . .1SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .1REAR PANEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2DISASSEMBLY PROCEDURES . . . . . . . . . . . . . . .34REPAIR PROCEDURES . . . . . . . . . . . . . . . . . . . . .56ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . .78PRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . .912BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . .13SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . .1415PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1624RadioFans.CN 收音机爱 好者资料库YST-SW800YST-SW800I TO SERVICE PERSONNEL1. Critical Components InformationComponents having special characteristics are marked Zand must be replaced with parts having specifications equalto those originally installed.2. Leakage Current Measurement (For 120V Models Only)When service has been completed, it is imperative to verifythat all exposed conductive surfaces are properly insulatedfrom supply circuits.GMeter impedance should be equivalent to 1500 ohm shuntedby 0.15F.AC LEAKAGETESTER OREQUIVALENTEQUIPMENTUNDER TESTINSULATINGTABLEWALLOUTLETWARNING: CHEMICAL CONTENT NOTICE!The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/orplastic (where applicable) components may also contain traces of chemicals found by the California Health andWelfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm.DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FORANY REASON WHATSOEVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumesor expose eyes to solder/flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your handsbefore handling food.1GLeakage current must not exceed 0.5mA.GBe sure to test for leakage with the AC plug in bothpolarities.ISPECIFICATIONSU . . . . . . . . . . USA modelC . . . . . .Canadian modelA . . . . . Australian modelB . . . . . . . . British modelG . . . . . European modelType . . . . . . . . . Advanced Yamaha Active Servo TechnologyDriver . . . . . . . . . . . 25 cm (9-13/16) cone woofer (JA25610)Magnetically shielded typeAmplifier OutputU, C models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1kWA, B, G models . . . . . . . . . . . . . . . . . . . . . . . . . . . 800W/6Input ImpedanceINPUT1 (SP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4.7kINPUT2 (PJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12kFrequency Response . . . . . . . . . . .18 Hz to 160 Hz (-10 dB)Power SupplyU, C models . . . . . . . . . . . . . . . . . . . . . . . . .AC120V, 60 HzA model . . . . . . . . . . . . . . . . . . . . . . . . . . . .AC240V, 50 HzB, G models . . . . . . . . . . . . . . . . . . . . . . . . .AC230V, 50 HzPower Consumption . . . . . . . . . . . . . . . . . . . . . . . . . . . .250WDimensions (W x H x D) . . . . . . . . . . . . 390 x 482 x 420 mm(15-3/8 x 19 x 16-9/16)Weight . . . . . . . . . . . . . . . . . . . . . . . . . . 24 kg (52 lbs. 14 oz)FinishAll model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black colorG model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cherry colorAccessories . . . . . . . . . . . . . . . . . . . . . . . . . . Nonskid pad x 4* Specifications subject to change without notice.RadioFans.CN 收音机爱 好者资料库YST-SW800YST-SW800I REAR PANEL2M U, C modelsM A modelM B, G modelsYST-SW800YST-SW8003IDISASSEMBLY PROCEDURES(Remove parts in the order as numbered.)1. Removal of Front Panel AssyRemove 4 screws ( q ) and then remove the FrontPanel Assy in Fig. 1.*Use an Allen wrench (3mm) to unscrew the FrontPanel Assy.Fig. 2Fig. 1*When assembling the Rear Panel, check to ensure thatthe gasket is not damaged so as to prevent air leakagefrom occurring.Fig. 32. Removal of Loud Speakera. Remove 8 screws ( w ) and then remove the BaseAssy in Fig. 2.b. Remove 8 screws ( e ) and then remove the LoudSpeaker in Fig. 2.3. Removal of Rear Panel AssyRemove 16 screws ( r ) in Fig. 3.*Arrow marks ( ) are printed to identify the screws to beremoved.GInstallation of emblem1. Put the emblem into the cabinet at the specified posi-tion.2. Place a piece of cloth/wood on top of the emblem.3. Using a mallet, hammer the emblem in place throughthe cloth/wood.*Use special care not to cause damage to the emblem orcabinet while hammering the emblem.qqFront Panel AssyMain (5) P.C.B.wwwweeLoud SpeakerBase AssyrRear Panel AssyrYST-SW800YST-SW8004420 (16-9/16)22(7/8)8(5/16)390 (15-3/8)390 (15-3/8)482 (19)390 (15-3/8)GInstallation of power switchRapid cures bond (such as 5 minute epoxy) is required to fix the power switch.As shown in Fig. 4, apply rapid cures bond (such as 5 minute epoxy) to the power switch (the area whichcontacts the rear panel), insert it in the rear panel and make sure it is fixed.(Inserting the power switch in the rear panel only would not be sufficient for its secure installation.)GPrecaution for installation of power cordAfter connecting the power cord, be sure to apply the rapid cures bond (such as 5 minute epoxy) to thecord stopper as shown in Fig. 4,Bond application diagram (Fig. 4)G DimensionsUnits : mm (inch)Apply rapid cures bondApply rapid cures bond between the switch and rear panel.Glue ListPlaceNameCord stopper5 minute epoxy or2051(Revertex Finewaters SDN.BHD.) orVYLOK 917DH (National Starch &Chemical (M) SDM.BHD.)Power switch5 minute epoxy or Diabond 1620BApply rapid cures bond before installing the P.C.B.YST-SW800YST-SW800It is recommended to disconnect the SW power supply section and the power amplifier because it is highly possiblethat the SW power supply section has also broken down due to the overload caused by breakdown in the poweramplifier.Repair Procedure1) Remove CB201, CB202 and CB205. (Power (1) P.C.B.)Then the power supply circuit and the power amplifier circuit will be disconnected.2) Repair the power amplifier as described below. (Main (1) P.C.B.)Replace the defective parts.Whether the major parts are defective or not can be checked as follows.Remove 3 screws fixing the heat sink to the rear panel and 4 screws fixing thesupport P.C.B. to the rear panel.FET (Q1619, Q2224): Measure the resistance value between GATE and SOURCEto determine whether a failure exists or not.If the measured resistance value is close to 0, a failureexists.If the measured resistance value is close to the value ofthe resistor connected between GATE and SOURCE, nofailure exists.Remove 3 screws fixing the Main (1) P.C.B. to the support P.C.B.TR (Q14):Check DIODE characteristics between BASE and EMITTERor between BASE and COLLECTOR to determine whethera failure exists or not.Check the operation as follows.a. Prepare a stabilized DC power source equipped with +30V and -30V outputs.b. Connect +B, -B and GND output terminals of the stabilized power source to +B, -B and GND lines of the poweramplifier.c. Connect the terminal of the oscilloscope to the circuit between q in the figure and GND.d. Remove CB1. (Main (2) P.C.B.)e. Connect the output of the signal generator to the circuit between the lead on the (-) side of C1 and GND.f. Set the frequency of the signal generator to the 100Hz sine wave and the output level to the minimum level.g. Turn on the stabilized DC power source.h. Raise the output level of the signal generator gradually and check the output waveform on the oscilloscope.i. If nothing abnormal is found with the waveform until the output level reaches 40Vp-p, the check result is OK.After operation checkConnect CB1.3) Repair the SW power supply section as follows. (Power (1) P.C.B.)Follow the instruction described below to avoid any danger.High voltage maintained in C209 and C210 even after the power is turned off is dangerous. It is necessary toforce this electric charge to be discharged before starting the repair work.For such forced discharge, connect a resistance of approximately 100/5W to each of both terminals of thecapacitor. Then check to make sure that the voltage between the capacitor terminals is 0V.Replace the defective parts.Whether the major parts are defective or not can be checked as follows.TR (Q202205): It is highly possible that a failure occurs due to a shortbetween COLLECTOR and EMITTER.R216, R217:It is highly possible that a failure occurs due to an opencircuit.I REPAIR PROCEDURES5GDSBCEBCEBCEFETTRTRYST-SW800YST-SW800Check the operation and make adjustment as follows.a. Connect CB205.b. Connect the probe of the oscilloscope between TP201and TP202.c. Turn on the power switch and the STANDBY/ON switchon the front panel.d. Check the waveform on the oscilloscope and adjustVR201 so that a = b is obtained.Permissible range: a/b = 1.0 0.1CAUTIONElectric potential is always applied to the ground side of the oscilloscope.Be careful so that no other part comes in contact with it.Caution for operation check of the SW power supply section and the power amplifierAs a high voltage is applied to the SW power supply section and the power amplifier, be careful notto receive an electric shock.V : 50V/divH : 10 sec/divAC range1 : 1 probe0Vab280Vp-pPower (1) P.C.BQ18Q16Q22Q24Q39Q25Q23Q17Q19 BGND+ BMain (1) P.C.BMain (2) P.C.Bq6YST-SW800YST-SW8007I ADJUSTMENTSGIdling AdjustmentTo stabilize operation of the amplifier, turn ON thepower with no input signal and wait for 1 or 2 minutesin non loaded condition before the adjustment.Adjust VR1 so that the voltage between terminalsTP1 and TP2 is DC 50mV to 250mV.Point A(Cathode of D27)V : 50V/divH : 2 msec/divDC range1 : 1 probe0VPoint B(Anode of D24)V : 50V/divH : 2 msec/divDC range1 : 1 probe0VGConfirmation of Power Amp operationFor the power amplifier which has been repaired, itis absolutely necessary to confirm that a correctwaveform is obtained at points indicated by A and Bin the schematic diagram according to the followingprocedure.Devices requiredSignal generator (100Hz sine wave)8 or 6 load resistorOscilloscope (dual trace type)Connection1) Connect the output signal from the signal generatorto the input terminal of YST-SW800.2) Disconnect the connector terminal connected to thespeaker unit and reconnect it to the load resistor.3) Connect the HOT side of the oscilloscope CH1 probeto the point A or B indicated in the figure and theGND side to the GND of the main unit.4) Connect the oscilloscope CH2 input to the red sideof the connector cable, which is connected with theload resistor.At this time, the GND terminal of CH2 must be leftunconnected.Setting1) Set the signal generator to the sine wave, 100Hz andminimum output level settings.2) Set the volume of YST-SW800 to the minimumposition.3) Turn on the power to YST-SW800.4) Adjust the output level of the signal generator and thevolume of YST-SW800 so that the output levelobserved at oscilloscope CH2 is 70Vp-p.Waveform observationWith the settings made as described above, observethe waveform obtained at CH1 for judgment.NormalAbnormal+B or GND levelBecomes constantAbnormal-B or GND levelBecomes constantGConfirmation of AUTO STANDBY operationSetting1) Turn off the power switch.2) In order to shorten the time required for operationcheck; connect a 10k resistor at both ends of R162on the MAIN (2) P.C.B.3) Connect the output signal from the signal generatorto the L/MONO terminal of YST-SW800.4) Set the signal generator for the sine wave of 100Hz,8mV.5) Turn on the power switch.Confirmation1) Set the AUTO STANDBY switch to the LOW position.2) Turn on the STANDBY/ON switch.The display LED lights up (green) and its colorchanges to red after 5 to 10 seconds.3) Turn off the STANDBY/ON switch.The display LED goes off.4) Set the AUTO STANDBY switch to the HIGH position.5) Turn on the STANDBY/ON switch.The display LED lights up (green) and its colorremains unchanged even after time have elapsed.6) Turn off the STANDBY/ON switch.The display LED goes off.After confirmation1) Turn off the power switch.2) Disconnect the 10k resistor connected to both endsof R162.YST-SW800YST-SW8008G Schematic DiagramG Test PointsQ18Q16Q22Q24Q39Q25Q23Q17Q19 BGND+ BMain (1) P.C.BDC 50mV to 250mVPoint APoint BIDLING CURRENT ADJ.DC 50mV to 250mVABREWHABCDE1234567YST-SW800I PRINTED CIRCUIT BOARD (Foil side)981REBLRETO : POWER (1)#201BEBLBETO : POWER (1)#202BAQ19Q17Q23Q25Q39Q24Q22Q16Q18MAIN ( 1 ) P. C. B. 12+12FROM : MAIN (2)B1E+B1FROM : MAIN (2)FROM : MAIN (2)DR+OUTDRAYST+V1REWHTO : SPEAKERIDLING CURRENT ADJ.DC 50mV to 250mVIDLING TEST POINTABCDE1234567YST-SW800I PRINTED CIRCUIT BOARD (Foil side)1081919191MAIN ( 2 ) P. C. B. +B1EB1TO : MAIN (1)#10W10FROM : MAIN (4)MA1ETOVL+1212LIMMA2FROM : MAIN (5)TVOLEMAIN+V2+1212PWSVCC+1212TO : MAIN (1)#12W12FROM : MAIN (4)SWLSWH2SWH1SOTO : POWER (1)#2W2VCC+V1EDR+OUTDRAYST+V1TO : MAIN (1)#11W11ABCDE1234567YST-SW800I PRINTED CIRCUIT BOARD (Foil side)118119MAIN ( 4 ) P. C. B. BASSPHASEAUTOSTANDBYINPUT2B, G onlyRL+OUTPUTINPUT 1MA2LIM12+12TOVLEMA1TO : MAIN (2)#1W1SWLSWH2SWH1SOTO : MAIN (3)#4W419VCCPWS12+12+V2MAINETOVLFROM : MAIN (2)VOLUMEHIGHCUTSTANDBY/ONMAIN ( 5 ) P. C. B. ORGYTO : POWER