Yamaha-F20B-pwr-sm 维修电路原理图.pdf

SERVICE MANUALHAMAMATSU, JAPAN1.507K-033 K Printed in Japan 2001.08011592GA20010720-17800 CONTENTSSPECIFICATIONS . 3PANEL LAYOUT. 3CIRCUIT BOARD LAYOUT. 4BLOCK DIAGRAM . 4DISASSEMBLY PROCEDURE . 5CIRCUIT BOARDS . 7IC BLOCK DIAGRAM. 8INSPECTIONS. 8PARTS LISTOVERALL CIRCUIT DIAGRAMBASS AMPLIFIERThis document is printed on chlorine free (ECF) paper with soy ink.RadioFans.CN 收音机爱 好者资料库2F-20BIMPORTANT NOTICEThis manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been assumed thatbasic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and understood by theusers, 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 per form 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, certifica-tion, recognition of any applicable technical capabilities, or establish a principal-agent relationship of anyform.The data provided is believed 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, therefor, inevitable andchanges in specification are subject to change without notice or obligation to retrofit. Should any discrepancy 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).IMPORTANT:Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power tothe 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 possibly otherentities) 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 REASONWHAT SO EVER!Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes tosolder / flux vapor!If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handling food.IMPORTANT NOTICE FOR THE UNITED KINGDOMConnecting the Plug and CordWARNING:THIS APPARATUS MUST BE EARTHEDIMPORTANT: The wires in this main lead are coloured in accor-dance with the following code: GREEN-AND-YELLOW: EARTH BLUE: NEUTRAL BROWN: LIVEAs the colours of the wires in the main lead of this apparatus may notcorrespond with the coloured markings identifying the terminals in yourplug, proceed as follows:The GREEN-and-YELLOW wire must be connected to the terminal in theplug that is marked with the letter E or the safety earth symbol (or colouredGREEN or GREEN-and-YELLOW).The BLUE wire must be connected to the terminal that is marked with theletter N (or coloured BLACK).The BROWN wire must be connected to the terminal that is marked withthe letter L (or coloured RED).This applies only to products distributed by Yamaha Kemble Music (U. K.) Ltd. WARNINGComponents having special characteristics are marked andmust be replaced with parts having specification equal to thoseoriginally installed.RadioFans.CN 收音机爱 好者资料库3F-20B SPECIFICATIONS PANEL LAYOUT?Rated Output Power:20WSpeaker:25cm x 1Controls:VOLUME, TREBLE, HIGHMID, LOW MID, BASS,Input Level Select Switch(PASSIVE/ACTIVE)Input/Output Terminals:INPUT, AUX IN, PHONESPower Consumption:25W/120V (UL, CSA)25W/230V (E, BS)Power Requirements:U.S. and Canadian mod-els: 120V, 60HzGeneral model: 230V,50HzDimensions (W x H x D) : 357 x 453 x 242mm (14.1x 17.8 x 9.5)Weight:10.5kg (23 lbs 2 oz)? INPUT? PASSIVE/ACTIVE (Input Level Select Switch)? VOLUME* No sound is produced when the VOLUME knobis set to 0.ACTIVE EQUALIZER? TREBLE? HIGH MID? LOW MID? BASS? POWER INDICATOR* The lamp will light when the amplifiers powerswitch is ON.? AUX IN* Use the volume control on the audio device tocontrol its volume level.? PHONES* The speaker will produce no sound when a pairof headphones is connected to this jack.? POWER? ?4F-20B CIRCUIT BOARD LAYOUTMAIN 1/2MAIN 1/2MAIN 1/2MAIN 2/2MAIN 2/2AC CordPower Transformer BLOCK DIAGRAM+B+12V-12V-BGNDPOWERAMPIC4IC1IC3123114INPUTFUSEFZ1ACTIVE TYPETONE CONTROLPOWER SUPPLY CIRCUITPOWER TRANSFORMER4 SpeakerPHONEAUX INCN2 4PCN1 2PCN3 3PCN4 5PCN5 5PPOWER SWITCHSW1T2T1T4T1T2GU, C, S, BSMAIN 1/2MAIN 2/2T3GAIN SELECTACTIVE CH.PASSIVE CH.BASSVR5LOW MIDVR4HIGH MIDVR3TREBLEVR2VR1IC357VOLUMEJK3JK2JK1SW2IC1,IC2OP AMPOP AMP84+12V-12V-B+B53+12V-12V84? Top View? Side View? Front View5F-20B DISASSEMBLY PROCEDURE30 x 460aABackBoardSpeakerPre-Main UnitPre-Main Unit(Fig.1)MAIN1/2 Circuit BoardNeedle-nose plierMAIN1/2 Circuit BoardNeedle-nose plierNeedle-nose plierMAIN1/2 Circuit BoardP40P40P40(Fig. 2)30: Truss Head Screw 4.0X25 MFZN2BL (VN347600)A: Bind Head Tapping Screw 4.0X25 FCRM3-BL (EI340256)60a: Bind Head Screw (VB403600)1.Pre-Main Unit (Time required: about 2 min)1-1Remove the eight (8) screws marked A. The backboard can then be removed. (Fig.1)1-2Pull out the speaker wires. (Fig.1)1-3Remove the four (4) screws marked 30. The pre-main unit can then be removed by sliding itbackward. (Fig.1)2.Speaker (Time required: about 2 min)2-1Remove the back board. (See Procedure 1-1)2-2Pull out the speaker wires. (Fig.1)2-3Remove the four (4) screws marked 60a. Thespeaker can then be removed. (Fig.1)3.MAIN 1/2 Circuit Board(Time required: about 4 min)3-1Remove the pre-main unit. (See Procedure 1)3-2Remove the five (5) knobs marked P100 and thefive (5) hexagonal nuts marked C. (Fig.5)3-3Remove the hexagonal nut marked A120 and thehexagonal nut marked A140. (Fig.5)3-4Push the hooks of the spacer support (at the arrowsymbol area of illustration) with a needle-nose plierto unlock.The MAIN 1/2 circuit board can then be removed.(Fig.2)6F-20BMAIN 1/2MAIN 2/2P100, CA120P60P70P80A140P70P60P40P40Power TransformerA120: Hexagonal Nut 9.0 12X2 MFNI33 (LX200060)A140: Hexagonal Nut 12.0 14X2 MFNI33 (ES200210)P60: Pan Head Screw 4.0X10 MFZN2BL (V7018000)P70: Hexagonal Nut #1 4.0 MFZN2Y (VB837300)P80: Bind Head Screw-1 3.0X16 MFZN2BL (V7018100)P100: Knob (V6955100)(Fig. 5)P60P70P60P70P60P70Power TransformerPower TransformerPower Transformer(Fig.4)P80P80P80MAIN1/2 Circuuit BoardMAIN1/2 Circuuit BoardMAIN1/2 Circuuit BoardMAIN1/2 Circuuit BoardMAIN1/2 Circuuit BoardMAIN1/2 Circuuit Board(Fig. 3)4.MAIN 2/2 Circuit Board(Time required: about 3 min)4-1Remove the pre-main unit. (See Procedure 1)4-2Remove the screw marked C80. The MAIN 2/2circuit board can then be removed. (Fig.3, Fig.5)5.Power Transformer (Time required: about 4 min)5-1Remove the pre-main unit. (See Procedure 1)5-2While holding the nuts marked P70 with aspanner, remove the two (2) screws marked P60.The power transformer can then be removed.(Fig.4)7F-20BHIGH MIDLOW MIDBASSAUX INPHONESPOWERto SPEAKERto MAIN 2/2 CN4from POWERTRANSFORMERto POWERTRANSFORMERfrom AC CORDto POWER SWAAINPUTGAINSELECTVOLUMETREBLEAA? MAIN1/2 CIRCUIT BOARD CIRCUIT BOARDSMAIN 1/2 (J, U, C):CNA-V755470MAIN 1/2 (H, B):CNA-V755480MAIN 2/2 (J, U, C):CNA-V755470MAIN 2/2 (H, B):CNA-V755480? MAIN2/2 CIRCUIT BOARDComponent sideto MAIN 1/2 CN5VERSIONFUSERATEINDICATIONJ, U250V 315mALE, BS250V T160mALMust beerasedMust beerasedComponent side8F-20B INSPECTIONS IC BLOCK DIAGRAMBA4558 (XO078A00)Dual Operational Amplifier1234-V8765Output A+VNon-InvertingInput A-DC Voltage Supply+DC VoltageSupplyOutput BInvertingInput BNon-InvertingInput BInvertingInput A+-+-MAIN: IC1,IC2,IC31.PreparationTo inspect the main unit, the following jigs arerequired.CD playerHeadphonesBefore turning the power on, set all the knobs onthe panel to 0.Raise the Input Level Select Switch to selectPASSIVE position.2.Power supplyConnect the power cord to the suitable powersupply socket for each version.(UC-120V, E&BS-220V)3.Inspection procedure3-1Input the audio signal of CD player to the AUX INjack.3-2Make sure that rotating the VOLUME knob to theright (or left) makes the sound gradually larger (orsmaller).3-3Make sure that rotating the TREBLE knob to theright (or left) boosts (or cuts) the high frequency.3-4Make sure that rotating the HIGH MID knob tothe right (or left) boosts (or cuts) the upper-middlefrequency.3-5Make sure that rotating the LOW MID knob tothe right (or left) boosts (or cuts) the lower-middlefrequency.3-6Make sure that rotating the BASS knob to theright (or left) boosts (or cuts) the low frequency.3-7Make sure that the sound becomes smaller whenyou depress the Input Level Select Switch to selectACTIVE position.3-8Raise the Input Level Select Switch again to selectPASSIVE position. Make sure that the audiosignal sounds over the speaker.3-9Connect the headphones to the PHONES jack.Make sure that the speaker produces no sound andthe audio signal sounds over the headphones.3-10Set all the knobs on the panel to 0 and finish theinspection.F-20B1PARTS LISTBASS AMPLIFIER CONTENSOVERALL ASSEMBLY .2PRE-MAIN UNIT .4ELECTRICAL PARTS .6Note) DESTINATION ABBREVIATIONSA:Australian modelM:South African modelB:British modelO:Chinese modelC:Canadian modelQ:South-east Asia modelD:German modelT:Taiwan modelE:European modelU:U.S.A. modelF:French modelV:General export model (110V)H:North European modelW:General export model (220V)I:Indonesian modelN,X: General export modelJ:Japanese modelY:Export model WARNINGComponents having special characteristics are marked and must be replaced with parts havingspecifications equal to those originally installed. The numbers in “QTY” shows quantities for each unit. The parts with “-” in “Part No.” are not available as spare parts. The second letter of the shaded () part number is I, not one. The second letter of the shaded () part number is O, not zero.F-20B2 OVERALL ASSEMBLY502010C40C60C50C60C50C30C30AC20C70C90C804030C100C110Overall Cabinet AssemblyPre-Main Unit6060aF-20B3REF NO.PART NO.DESCRIPTIONREMARKSQTYRANKRANK: Japan only*New parts102020202030405050506060aC10C20C30C40C50C60C70C80C90C100C110A-V7461100-VN347600ET500040-XO361A00VB403600V7461100-V596900021770200V6327200V6327300V7017900V6327400EP03031003765580V7363300VN729100EI340256*OVERALL ASSEMBLYOverall AssemblyOverall AssemblyOverall AssemblyOverall AssemblyOverall Cabinet AssemblyPre-Main UnitPre-Main UnitPre-Main UnitPre-Main UnitTruss Head ScrewFlat WasherLabelLabelLabelSpeaker UnitBind Head ScrewOVERALL CABINET ASSEMBLYOverall Cabinet AssemblyCabinet AssemblyCorner ProtectorOval Head ScrewHandleHandle HolderOval Head ScrewFootBind Head Tapping Screw-1Flat WasherName PlateBind Head Tapping Screw-1Bind Head Tapping Screw4.0X25 MFZN2BL4.0X10X0.8 MFZN2BL4ohm 30W3.0X12 MFZN2BLKPBO KAH1D-205KPBO KAH3D400-A4.0X25 MFZN2BLKPBO KRRU193.0X16 MFZN2BL3.0X8X0.5 MFZN2BL3.0X10 MFZN2BL4.0X25 FCRM3-BLF-20BJ (V745880)U,C (V745890)H (V745900)B(V745910)J(V745930)U,C(V745940)H (V745950)B (V745960)J (V745970)U,C(V745980)H,B (V745990)F-20B(V746050)444612224442801010101010101010101F-20B4A10A70A60A40A10A30A80A90A20P60P40P60P30P75P70P50P10P20P90P80A50P100P120P110A100A110A130A140A120Amp KitP77 PRE-MAIN UNITF-20B5REF NO.PART NO.DESCRIPTIONREMARKSQTYRANKRANK: Japan only*New partsP10P20P30P30P30P30P40P50P60P70P75P77P80P90P100P110P120A10A10A20A30A40A50A50A50A60A70A70A70A70A80A90A100A110A120A130A140-V6954800V7460600-V7511400V7017600V7018000VB837300VB501900V7834000V7018100V7554300V6955100ET900050-V7554700V7554800VV849300V7356900V7054700XZ805A00XZ806A00XZ807A00VV104600V6286700V6286900V6287000V6287100V7356700V7356800ET800150VL802300LX200060VB508700ES200210PRE-MAIN UNITPre-Main UnitPre-Main UnitPre-Main UnitPre-Main UnitChassisPanel SheetAmp KitAmp KitAmp KitAmp KitSpacer SupportHeat SinkPan Head ScrewHexagonal NutSpring WasherVibration-proof TapePan Head ScrewButtonKnobToothed Lock Washer-BEarth MarkAmp KitAmp KitAmp KitAmp KitCircuit BoardCircuit BoardInsulation SheetSleevePower SWTransformerTransformerTransformerCord HolderCordCordCordCordCord Strain ReliefCord Strain ReliefToothed Lock Washer-AFlat WasherHexagonal NutFlat WasherHexagonal NutPINGOOD LCC-104.0X10 MFZN2BL#1 4.0 MFZN2Y4.0 MFZN2Y3.0X10 MFZN2BLGA-RED4.0 MFZN2BLMAINMAINBFG-20AD 19X2412SWS0220SDDJE1-A-2JUCECV-100J VCTFUC 3 SJT 18/3E 3 HO5VV-FUK 3 HO5VV-FKR-61 KITAGAWAKF-41 KITAGAWA9.0 MFZN2Y9X14 0.5 FNM39.0 12X2 MFNI3318X12.5 0.6 MFZN212.0 14X2 MFNI33F-20BJ(V745930)U,C(V745940)H(V745950)B(V745960)J(V746070)U,C(V746080)H(V746090)B(V746100)GAIN SELECTVOLUME,TREBLRE,HIGH MIDLOW MID,BASSU,C,H,BU,C,H,B (V777110)J (V746070)U,C(V746080)H (V746090)B (V746100)J,U,CH,BPOWER ON/OFFJU,CH,BJU,CHB222225205010101010205010401010101*REF NO.PART NO.DESCRIPTIONREMARKSQTYRANKF-20B6RANK: Japan only*New partsV7554700V7554800V7554700V7554800-V6609900VV291400UR866100VZ353500UR847100VZ353500VZ353500UR866330VV061200UR865470VV060600UR865100VV059800VV062600VZ353500UR866100VV059800VZ353500UR866100FG613100UR866100UR837470VV062800VV062800UR847100UR847100V7355000VZ354600VZ354600UR749330UR749330UR847100UR847100VG879900LB932040LB918030VP344100V 7 6 3 0 8 0V 7 8 3 5 7 0X0078A00X0078A00XZ311A00V3633400V6176500V7447000VV620800HF456220HF457270HF459100HF456100HF456270HF456100HF456330HF455680HF458100HF455680HF458100HF455680HF458100HF455680HF455220 ELECTRICAL PARTS*C01C02C03C04C05C06C07C08C09C10C11C12C13C14C15C16C17C18C19C20C21C22C23-26C27C28C29C30C31C32C33CN1CN2CN3DB1FZ1FZ1IC1-3IC4JK1JK2JK3LD1R01R02R03R04R05R06R07R08R09R10R11R12R13R14R15ELECTRICAL PARTSCircuit BoardCircuit BoardCircuit BoardCircuit BoardConnector AssemblyConnector AssemblyConnector AssemblyFuse HolderJumper WireElectrolytic Cap.Ceramic Capacitor-SLElectrolytic Cap.Ceramic Capacitor-SLCeramic Capacitor-SLElectrolytic Cap.Mylar CapacitorElectrolytic Cap.Mylar CapacitorElectrolytic Cap.Mylar CapacitorMylar CapacitorCeramic Capacitor-SLElectrolytic Cap.Mylar CapacitorCeramic Capacitor-SLElectrolytic Cap.Ceramic Capacitor-BElectrolytic Cap.Electrolytic Cap.Mylar CapacitorMylar CapacitorElectrolytic Cap.Electrolytic Cap.CapacitorMonolithic Ceramic Cap.Monolithic Ceramic Cap.Electrolytic Cap.Electrolytic Cap.Electrolytic Cap.Electrolytic Cap.Base Post ConnectorBase Post ConnectorBase Post ConnectorDiode StackFuseFuseICICICPhone JackPhone JackPhone JackLEDCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon ResistorCarbon Res