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1、SERVICE MANUALI CONTENTSTO SERVICE PERSONNEL . . . . . . . . . . . . . . . . . . . .1FRONT AND REAR PANELS . . . . . . . . . . . . . . . 1 2SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . .3INTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4DISASSEMBLY PROCE
2、DURES . . . . . . . . . . . . . . . . .5100778SERVICE MANUALYST-MS50(M)POWERED MULTIMEDIA SPEAKERSPRINTED CIRCUIT BOARD . . . . . . . . . . . . . . . . 6 8BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . .9SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . .10PARTS LIST .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . 11 15PARTS LIST FOR CARBON RESISTORS . . . . . . . .16The contents of this Service Manual are applicable to the products with serial numbers of Z200001 and up.YST-MS50(M)This manual has been provided for the use of authorized YAMAHA Retailers and
4、their service personnel.It has been assumed that basic service procedures inherent to the industry, and more specifically YAMAHA Products, are alreadyknown and understood by the users, and have therefore not been restated.WARNING:Failure to follow appropriate service and safety procedures when servi
5、cing this product may result in personalinjury, destruction of expensive components, and failure of the product to perform as specified. For thesereasons, we advise all YAMAHA product owners that any service required should be performed by anauthorized YAMAHA Retailer or the appointed service repres
6、entative.IMPORTANT:The presentation or sale of this manual to any individual or firm does not constitute authorization, certificationor recognition of any applicable technical capabilities, or establish a principle-agent relationship of anyform.The data provided is believed to be accurate and applic
7、able 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, inevita-ble and specifications are subject to change without notice or obligation to retrofit. Should any discrep
8、ancy appear to exist, pleasecontact 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 buss in the unit (heavy gauge black wires connect to thisbuss).IMPORTAN
9、T:Turn the unit OFF during disassembly and part replacement. Recheck all work before you apply power to theunit.IMPORTANT NOTICEBASS010SPEAKERSMULTIMEDIA POWERED YST-MS50POWERED MULTIMEDIA SPEAKERSVOLUMERadioFans.CN 收音机爱 好者资料库YST-MS50(M)YST-MS50(M)I TO SERVICE PERSONNEL1. Critical Components Informa
10、tionComponents 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
11、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 elect
12、rical/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 COMPO
13、NENTS 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 hands
14、before handling food.1I FRONT AND REAR PANELSGLeakage current must not exceed 0.5mA.GBe sure to test for leakage with the AC plug in bothpolarities.M Satellite Speakers Front PanelM Satellite Speakers Rear PanelLchRchLchRch“CAUTION”“F1 : FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ONLY WI
15、TH SAME TYPE 2.0A, 250V FUSE.”CAUTIONF1 : REPLACE WITH SAME TYPE 2.0A, 250V FUSE.ATTENTIONF1 : UTILISER UN FUSIBLE DE RECHANGE DE MEME TYPE DE 2.0A, 250V.A VRadioFans.CN 收音机爱 好者资料库YST-MS50(M)YST-MS50(M)M Subwoofer Front Panel2M Subwoofer Rear PanelU and C modelsA modelB and G modelsYST-MS50(M)YST-MS
16、50(M)ISPECIFICATIONSType . Advanced Active Servo TechnologyOutput PowerSatellite. 20W+20W (1kHz, 4 ohms at T.H.D.=10%)Subwoofer . 40W (100Hz, 5 ohms at T.H.D.=10%)Input Sensitivity .200mV (1kHz, 4 ohms at 20W)Input Impedance . 25 kohmsFrequency Response . 32 Hz to 20 kHzDriverSatelliteTweeter. 19mm
17、(3/4) balanced domeMagnetic shielding typeMidrange. 8cm (3) coneMagnetic shielding typeSubwoofer. 16cm (6-1/2) coneMagnetic shielding typePower Consumption . 65 WPower SupplyU, C models .AC120V, 60 HzA model .AC240V, 50 HzB, G models .AC230V, 50 HzDimensions (W X H X D)Satellite. 97 x 159 x 178 mm (
18、3-13/16 x 6-1/4 x 7)Subwoofer . 350 x 210 x 321 mm (13-3/4 x 8-1/4 x 12-5/8)WeightSatellite. 0.7 kg (1 lbs. 9 oz) x 2Subwoofer . 8 kg (17 lbs. 10 oz)Finish . White colorBlack colorAccessories3.5mm stereo mini plug cable (1.8m) x 1RCA pin plug cable (1.8m) x 18 pin plug cable (1.8m) x 18 pcs of nonsk
19、id pad x 1set* Specifications subject to change without notice.G Satellite SpeakerU . . . . . . . . . . . . . USA modelC . . . . . . . . . Canadian modelA . . . . . . . . Australian modelB . . . . . . . . . . . British modelG . . . . . . . . .European model3Unit : mm (inch)G DIMENSIONS97 (3-13/16)17
20、8 (7)166(6-17/32)159 (6-1/4)G Subwoofer210 (8-1/4)321 (12-5/8)350 (13-3/4)YST-MS50(M)YST-MS50(M)IINTERNAL VIEW4M Satellite SpeakersM SubwooferwqeryutNote:The Satellite Speakers are available by the speaker unit (L ch or R ch).Individual parts of the Satellite Speakers are not available. (See page 14
21、 and 15 of the PARTS LIST.)Satellite Speaker (L ch)qMAIN (B) P.C.B.Satellite Speaker (R ch)wMAIN (C) P.C.B.eMAIN (D) P.C.B.LchRchSubwooferrMAIN (E) P.C.B.tMAIN (A) P.C.B.ySPEAKER UNIT(Subwoofer)uMAIN (F) P.C.B.YST-MS50(M)YST-MS50(M)IDISASSEMBLY PROCEDURES(Remove parts in the order as numbered.)Fig.
22、2Fig. 1G Disassemble of the Subwoofer1. Removal of the Rear Panel Assy.a.Remove 8 screws ( q ) in Fig. 1, and remove therear panel assy.*Arrow marks ( ) are printed to identify the screws to beremoved.b.Disconnect one connector in Fig. 1.c.Disconnect the Speaker cord in Fig. 1.*When assembling the R
23、ear Panel Assy, check to ensurethat the packing is not damaged so as to prevent air leak-age from occurring.2. Removal of the Front Panel AssyThe front panel assy is fixed to the cabinet withdowels at 6 locations.* As a screwdriver (for slotted head screw) is usedfor removal, use special care not to
24、 cause damageto the Cabinet.a.Using the screwdriver insert in the gaps between thefront panel assy and cabinet (bottom side first), pushup the front panel assy.b.Remove the front panel assy while taking it out.(Front panel assy can not to remove completely.)3. Removal of the Speakera. Set up the fro
25、nt panel assy in the direction of thearrow, in Fig. 2.b.Remove 4 screws ( w ) in Fig. 2, and remove thespeaker.DowelsFront Panel AssyCabinetConnectorGapsSpeaker CordRear Panel AssySpeakerFront Panel Assyqw5ABCDEFGH123456YST-MS50(M)67MAIN ( A ) P. C. B. TO : SPEAKER (WOOFER)FROM : POWER CORDWHBEFROM
26、: MAIN ( F )FROM : MAIN ( E )TO RIGHTSPEAKERTO LEFTSPEAKERREWHWH: U, CBE: A, B, GBL: U, CBR: A, B, GMAIN ( E ) P. C. B. BASSTO : MAIN ( A )MAIN ( F ) P. C. B. POWERWHBETO : MAIN ( A )MAIN ( B ) P. C. B. TOSUB Wo.L+2.2SPEAKER(MIDRANGE)SPEAKER(TWEETER)BLREREI PRINTED CIRCUIT BOARD (Component side)M Sa
27、tellite Speaker (L ch)M SubwooferRef. No.LocationD2B2D3F3D4F2D5E2D6E3D7E3D8E3Ref. No.LocationIC1F2IC2E3IC4C2IC5C2IC6E2IC7E3G Semiconductor LocationRef. No.LocationQ3F3Q4F2Q5E2Q6F2Q7E2Q8E2ABCDEFGH123456YST-MS50(M)I BLOCK DIAGRAM89MAIN ( C ) P. C. B. TO : MAIN ( D )VOLUME(HEADPHONE)(POWER)21758436MAIN
28、 ( D ) P. C. B. TOSUB Wo.INPUT2INPUT1R+2.2SPEAKER(MIDRANGE)SPEAKER(TWEETER)REBLREFROM : MAIN ( C )Q2Q3Q8SW1POWERSW2F1D2IC4GNDIN+OUTIC5GNDINOUTPOWERTRANSFORMERRegulator(POWER)Q135VOLUMEVR1VR2IRJK4INPUT 1INPUT 2JK3Rch SATELLITE SPEAKERLch SATELLITE SPEAKERIL31G476JK2825+12+12+12PWSTOSUB Wo.TO LEFTSPEA
29、KERTO RIGHTSPEAKEROL17IC3(NJM4556AL)ORRSPRSP+TWEETERMIDRENGE+JK1(HEADPHONE)TWEETERMIDRENGE+SUBWOOFERSP+SPE1231G476825+12EOLPWSORRSPRSP+JK51212351212+12+1217H. P. F12dB/octH. P. F12dB/oct12+126dB/oct12+1212dB/octEQ AmpIC1,2(NJM4558D)MutePower Amp.IC6(STK408-040E)IC1IC2IC2IC1IC7IC7(NJM4558D)+121227201
30、18+1216126+12712317SWISRISLIPWS1RSP+LSP+PJ1TO SUB Wo.PJ2 16121498531+BBB+BBASSRectifierQ6Q7Q5Q4A. N. I. CONOFFI PRINTED CIRCUIT BOARD (Component side)M Satellite Speaker (R ch)Ref. No.LocationIC3B2Q1B2Q2B2G Semiconductor LocationABCDEFGH123456IJK78YST-MS50(M)ISCHEMATIC DIAGRAM* All voltage are measu
31、red with a 10M/V DC electric volt meter.* Components having special characteristics are marked Zandmust be replaced with parts having specifications equal to thoseoriginally installed.* Schematic diagram is subject to change without notice.10IC1, 2, 7 : NJM4558DDual OP-AmpIC3 : NJM4556ALDual OP-AmpI
32、N12+IN13VCC4+IN25IN26OUT27+VCC8OUT11+IC6 : STK408-040E3 Channels AF Power Amp2019181716151413121110987654321THERMAL SENSORSUBCH.1+CH.3+CH.2SUB GNDN. C.CH.2 VCCCH.1 VCCCH.1,2,3 +VCCCH.1 OUTCH.2 OUTPRE VCCPRE +VCCCH.1 INCH.1 NFC. C. C. BIASCH.2 NFCH.2 INCH.3 NFCH.3 INCH.2 VCCCH.3 OUTLIMITERA.N.I.CPOWE
33、R AMPLPFHPFPHONE AMPPOWER SUPPLY00000011.7000-11.500011.411.711.410.400011.7000-11.5000-11.500011.70-27.1-0.2-0.2-0.1-0.1-24.3-0.1-0.125.6-25.50027.1-27.1-27.10000000000000011.7-11.5-1.500000000000.2-11.50.2011.711.7027.1-11.50-27.1-27.1AC43.227.1+SATELLITEMIDRANGEL chSATELLITETWEETERL ch2.2+SATELLI
34、TEMIDRANGER chSATELLITETWEETERR ch2.2REBLTOSUB Wo.(HEADPHONE)TO RIGHTSPEAKERTO LEFTSPEAKERMAIN (C)VOLUME(POWER)INPUT 2INPUT 1WOOFER+MAIN ( D )REBLMAIN ( B )TOSUB Wo.MAIN ( F )POWERMAIN ( E )BASSMAIN ( A )WHREBEWHBLWHBRBEONOFFNJM4556ALNJM4558D1SS133AnodeCathodeBCE2SA1015 (O, Y)2SC1815 (Y, GR)2SC2878
35、(A, B)RBV-402DGSNJM78M12FASTK408-040EPIN CONNECTION DIAGRAM OF TRAN-SISTORS, DIODES AND ICS.+2SK304 (E)1201: OUTPUT2: COMMON3: INPUT321NJM79M12FA1:COMMON2:INPUT3:OUTPUT32114818+OUT1IN1VCC+VCCOUT212345+IN1IN2+IN2 +678YST-MS50(M)YST-MS50(M)11ABBREVIATIONS IN THIS LIST ARE AS FOLLOWS :C.A.EL.CHP: CHIP
36、ALUMI. ELECTROLYTIC CAPC.CE: CERAMIC CAPC.CE.ARRAY: CERAMIC CAP ARRAYC.CE.CHP: CHIP CERAMIC CAPC.CE.ML: MULTILAYER CERAMIC CAPC.CE.M.CHP: CHIP MULTILAYER CERAMIC CAPC.CE.SAFTY: RECOGNIZED CERAMIC CAPC.CE.TUBLR: CERAMIC TUBULAR CAPC.CE.SMI: SEMI CONDUCTIVE CERAMIC CAPC.EL: ELECTROLYTIC CAPC.MICA: MIC
37、A CAPC.ML.FLM: MULTILAYER FILM CAPC.MP: METALLIZED PAPER CAPC.MYLAR: MYLAR FILM CAPC.MYLAR.ML: MULTILAYER MYLAR FILM CAPC.PAPER: PAPER CAPACITORC.PLS: POLYSTYRENE FILM CAPC.POL: POLYESTER FILM CAPC.POLY: POLYETHYLENE FILM CAPC.PP: POLYPROPYLENE FILM CAPC.TNTL: TANTALUM CAPC.TNTL.CHP: CHIP TANTALUM C
38、APC.TRIM: TRIMMER CAPCN: CONNECTORCN.BS.PIN: CONNECTOR, BASE PINCN.CANNON: CONNECTOR, CANNONCN.DIN: CONNECTOR, DINCN.FLAT: CONNECTOR, FLAT CABLECN.POST: CONNECTOR, BASE POSTCOIL.MX.AM: COIL, AM MIXCOIL.AT.FM: COIL, FM ANTENNACOIL.DT.FM: COIL, FM DETECTCOIL.MX.FM: COIL, FM MIXCOIL.OUTPT: OUTPUT COILD
39、IOD.ARRAY: DIODE ARRAYDIODE.BRG: DIODE BRIDGEDIODE.CHP: CHIP DIODEDIODE.VAR: VARACTOR DIODEDIOD.Z.CHP: CHIP ZENER DIODEDIODE.ZENR: ZENER DIODEDSCR.CE: CERAMIC DISCRIMINATORFER.BEAD: FERRITE BEADSFER.CORE: FERRITE COREFET.CHP: CHIP FETFL.DSPLY: FLUORESCENT DISPLAYFLTR.CE: CERAMIC FILTERFLTR.COMB: COM
40、B FILTER MODULEFLTR.LC.RF: LC FILTER ,EMIGND.MTL: GROUND PLATEGND.TERM: GROUND TERMINALHOLDER.FUS : FUSE HOLDERIC.PRTCT: IC PROTECTORJUMPER.CN: JUMPER CONNECTORJUMPER.TST: JUMPER, TEST POINTL.DTCT: LIGHT DETECTING MODULENote) Those parts marked with “#” are not included in the P.C.B. assy.L.EMIT: LI
41、GHT EMITTING MODULELED.DSPLY: LED DISPLAYLED.INFRD: LED, INFRAREDMODUL.RF: MODULATOR, RFPHOT.CPL: PHOTO COUPLERPHOT.INTR: PHOTO INTERRUPTERPHOT.RFLCT: PHOTO REFLECTORPIN.TEST: PIN, TEST POINTPLST.RIVET: PLASTIC RIVETR.ARRAY: RESISTOR ARRAYR.CAR: CARBON RESISTORR.CAR.CHP: CHIP RESISTORR.CAR.FP: FLAME
42、 PROOF CARBON RESISTORR.FUS: FUSABLE RESISTORR.MTL.CHP: CHIP METAL FILM RESISTORR.MTL.FLM: METAL FILM RESISTORR.MTL.OXD: METAL OXIDE FILM RESISTORR.MTL.PLAT: METAL PLATE RESISTORRSNR.CE: CERAMIC RESONATORRSNR.CRYS: CRYSTAL RESONATORR.TW.CEM: TWIN CEMENT FIXED RESISTORR.WW: WIRE WOUND RESISTORSCR.BND
43、.HD: BIND HEAD B-TITE SCREWSCR.BW.HD: BW HEAD TAPPING SCREWSCR.CUP: CUP TITE SCREWSCR.TERM: SCREW TERMINALSCR.TR: SCREW, TRANSISTORSUPRT.PCB: SUPPORT, P.C.B.SURG.PRTCT : SURGE PROTECTORSW.TACT: TACT SWITCHSW.LEAF: LEAF SWITCHSW.LEVER: LEVER SWITCHSW.MICRO: MICRO SWITCHSW.PUSH: PUSH SWITCHSW.RT.ENC:
44、ROTARY ENCODERSW.RT.MTR: ROTARY SWITCH WITH MOTORSW.RT: ROTARY SWITCHSW.SLIDE: SLIDE SWITCHTERM.SP: SPEAKER TERMINALTERM.WRAP: WRAPPING TERMINALTHRMST.CHP : CHIP THERMISTORTR.CHP: CHIP TRANSISTORTR.DGT: DIGITAL TRANSISTORTR.DGT.CHP: CHIP DIGITAL TRANSISTORTRANS: TRANSFORMERTRANS.PULS: PULSE TRANSFOR
45、MERTRANS.PWR: POWER TRANSFORMER ASSyTUNER.AM: TUNER PACK, AMTUNER.FM: TUNER PACK, FMTUNER.PK: FRONT-END TUNER PACKVR: ROTARY POTENTIOMETERVR.MTR: POTENTIOMETER WITH MOTORVR.SW: POTENTIOMETER WITH ROTARY SWVR.SLIDE: SLIDE POTENTIOMETERVR.TRIM: TRIMMER POTENTIOMETERIELECTRICAL PARTSPARTS LISTI WARNING
46、Components having special characteristics are marked Z and must be replacedwith parts having specifications equal to those originally installed.GCarbon resistors (1/6W or 1/4W) are not included in the ELECTRICAL PARTSList. For the parts No. of the carbon resistors, refer to last page.YST-MS50(M)YST-
47、MS50(M)12P.C.B. MAINSchmRef.PART NO.DescriptionRemarksNew Parts*SchmRef.PART NO.DescriptionRemarksNew Parts*AAX31030P.C.B.MAIN (UC)353086*AAX31040P.C.B.MAIN (ABG)353090CB1VB858700CN.BS.PIN8PCB4VD004600CN.BS.PIN3PCB5VP206500HOLDER.FUSEYF-52BCCB6VP206500HOLDER.FUSEYF-52BCC1VJ836900C.EL10uF 16VC2VV0201
48、00C.EL220uF 10VC3FG211470C.CE47pF 50VC4VJ836900C.EL10uF 16VC5VV020100C.EL220uF 10VC6FG211470C.CE47pF 50VC7VJ836900C.EL10uF 16VC8VJ836900C.EL10uF 16VZC9VS741700C.CE.SAFTY0.01uF 275VC10VF964800C.EL100uF 16VC11UA654330C.MYLAR0.033uF 50VC12UA654330C.MYLAR0.033uF 50VC13VJ836900C.EL10uF 16VC14UA654330C.MY
49、LAR0.033uF 50VC15UA654330C.MYLAR0.033uF 50VC16VJ836900C.EL10uF 16VC17UR759470C.EL4700uF 35VC18UR857470C.EL47uF 35VC19UR759470C.EL4700uF 35VC20UR857470C.EL47uF 35VC21FG212470C.CE470pF 50VC22FG212470C.CE470pF 50VC23UA655100C.MYLAR0.1uF 50VC24VJ836900C.EL10uF 16VC25UR866220C.EL2.2uF 50VC26UR867100C.EL1
50、0uF 50VC27UR866220C.EL2.2uF 50VC28VJ836900C.EL10uF 16VC29UR867100C.EL10uF 50VC30UA655100C.MYLAR0.1uF 50VC31UM397330C.EL33uF 16VC32UA655150C.MYLAR0.15uF 50VC33UA655390C.MYLAR0.39uF 50VC34UJ668100C.EL100uF 50VC35UJ668100C.EL100uF 50VC36UM397330C.EL33uF 16VC37FG211150C.CE15pF 50VC38FG211150C.CE15pF 50V
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