Infinity-BU150-sub-sm 维修电路原理图.pdf

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1、Infinity Systems Inc.250 Crossways Park DriveWoodbury, N.Y. 117971-800-553-3332A Harman International CompanyRev A 3/2000BU-150Powered SubwooferSERVICE MANUALRadioFans.CN 收音机爱 好者资料库SAFETY INFORMATIONWarningAny person performing service of this unit will be exposed tohazardous voltages and the risk o

2、f electric shock.It isassumed that any person who removes the amplifier from thiscabinet hasbeen properly trained in protecting againstavoidable injury and shock.Therefore, any serviceprocedures are to be performed by qualified service personalONLY!CautionThis unit does not have a power switch. Haza

3、rdous voltagesare present within the unit whenever it is plugged in.Before the amplifier is plugged in, be sure its rated voltagecorresponds to the voltage of the AC power source to beused. Incorrect voltage could cause damage to the amplifierwhen the AC power cord is plugged in. Do not exceed rated

4、voltage by more than 10%: operation below 90% of ratedvoltage will cause poor performance or may shut the unit off.List of Safety Components RequiringExact ReplacementsF1Fuse SLO BLO 1.5A 250V 20mm.UL approvedPWRCORDSPT-2 or better with polarized plug, ULapproved wired with the hot side to fused sid

5、e.Use with factory replacement panel strain reliefonly.T1Transformer. Use only factory replacement.DBRBridge diode. Use only factory replacement.C1, 22200uF, 100V electrolytic filter caps. Be surereplacement part is at least the same workingvoltage and capacitance rating. Also the leadspacing is imp

6、ortant. Incorrect spacing maycause premature failure due to internal cabinetpressure and vibration.C64.7uF 100V electrolytic radialS64AMIPower output module. Use only factoryreplacementFaceplateFaceplate. Use only factory replacementAir leak cover Use only factory replacementCMC1Use only factory rep

7、lacementL1Use only factory replacementFuse PCBUse only factory replacementMain PCBUse only factory replacementLeakage/Resistance CheckBefore returning the unit to the customer, perform a leakageor resistance test as follows:Leakage Current. Note there is no power switch on this unit.When the power p

8、lug is plugged in, the unit is live. Connectthe unit to its rated power source. Using an ammeter,measure the current between the neutral side of the ACsupply and chassis ground of the unit under test. if leakagecurrent exceeds 0.5mA, the unit is defective. Reverse thepolarity of the AC supply and re

9、peat.Resistance. Measure the resistance from either side of theline cord to chassis ground. If it is less than 500k ohms, theunit is defective.WARNING! DO NOT return the unit to the customer if it failsone of these tests until the problem is located and corrected.2Amplifier/SubwooferBU-150RadioFans.

10、CN 收音机爱 好者资料库3Amplifier/SubwooferBU-150GENERAL SPECIFICATIONSFrequency Response (?3dB) . . . . . . . . . . . . . . . . . 28Hz 150HzOutput (RMS). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200WDriver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 WooferCrossover F

11、requency . . . . . . . . . . . . . . . . . . . . . . . 50Hz 150Hz (continuously variable)Dimensions (H x W x D) . . . . . . . . . . . . . . . . . . . . . 17 ? x 17 ? x 17 ? (451 x 451 x 451mm)Add 1? (4.5cm) for feet.Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 lbs/20

12、kgRefinements may be made on occasion to existing products without notice,but will always meet or exceed original specifications unless otherwise stated.TABLE OF CONTENTSSAFETY INFORMATION.2GENERAL SPECIFICATIONS.3DETAILED SPECIFICATIONS .4CONTROLS AND THEIR FUNCTION .6BU-150 CONNECTIONS.7OPERATION

13、.11BU-150 TEST SET UP AND PROCEDURE.12BU-150 POWER AMP MODULE TESTINGFLOW CHART .13BU-150 PACKING & CABINET ASSEMBLY .14BU-150 AMPLIFIER ASSEMBLY EXPLODED VIEW.15BU-150 PCB (Version 3.52) Component Side Trace.16BU-150 PCB (Version 3.52) Solder Side Trace .17BU-150 PCB (Version 3.53) Component Side T

14、race.18BU-150 PCB (Version 3.53) Solder Side Trace .19BU-150 ELECTRICAL PARTS LIST .20BU-150 INTEGRATED CIRCUIT DIAGRAMS.21BU-150 SCHEMATIC 1 of 2.22BU-150 SCHEMATIC 2 of 2.23DETAILED SPECIFICATIONSLINE VOLTAGEYes/NoHi/Lo LineNom.UnitNotesUS 120vac/60HzYes108-132120VrmsNormal OperationParameterSpeci

15、ficationUnitTestLimitsConditionsNotesAmp SectionType (Class AB, D,other)Dn/aClass D Preferred.Sinkrequired for Class ABLoad Impedance(speaker)8Ohmsn/aNominalZ-curve requiredRated Output Power200Watts1201 input drivenInput voltage 120 VAC, 60 HzTHD1%222k filter120W (Power Bandwidth30-100Hz) 120 VACTH

16、D 1 Watt0.5%0.522k filterDC Offset80DF50Measured across amplifieroutputsInput SensitivityInput Frequency35HzNominal Freq.1 input drivenLine Input265mVrms2dBTo Rated Power/Vol Max1 input driven: AP source Z =600 ohmsSpeaker/Hi Level Input7Vrms2dBTo Rated Power/Vol Max1 input driven: AP source Z =25 o

17、hmsSignal to NoiseSNR-A-Weighted100dBA90Relative to ratedoutputA-Weighting filterSNR-unweighted75dBr70Relative to ratedoutput22k filterSNR rel. 1W-unweighted(22k)65dBr55relative to 1WOutput22k filterResidual Noise Floor2mVrms3Volume max, using RMS reading DMM/VOM (orA/P) , BW 20KHzResidual Noise Flo

18、or1.5mVrms(max)2Volume max, w/ A/P Swept BandpassMeasurement (Line freq.+ harmonics) , BW 3min.T before muting,after signal isremovedPower on Delay time1sec.3AC Power AppliedTransients/PopsSignal-Present Transient5mV-peakn/a Speaker OutputsTurn-on Transient1mV-peak2v-pp Speaker Outputs AC Line cycle

19、d from OFF toONTurn-off Transient2mV-peak4v-pp Speaker Outputs AC Line cycled from ON toOFFEfficiencyStand-by Input Power20Watts28 nom. linevoltageInput Line voltage 120 VACPower Cons.ratedpower210Watts220 nom. linevoltageEfficiency95.24%54.55%Relative to ratedoutputProtectionShort Circuit Protectio

20、nYESfunctionalck.Direct short atoutputThermal ProtectionYESfunctionalck.1/8 maxunclipped PowerPower transformer 85 deg C.Line Fuse Rating2Amps2Slo-Blo type5Amplifier/SubwooferBU-1506Amplifier/SubwooferBU-150CONTROLS AND THEIR FUNCTION1.High-Level input and Output terminals2.Low-Level Input Jacks: co

21、nnect to preamplifier outputs3.Low Pass: This is the crossover frequency controlwhich determines the upper-corner roll-off points.4.Power-On indicator5.Phase: 0/180 switch to change audio-signal polarity.6.Level: This controls the volume level of the subwoofer.TO REDUCE THE RISK OF ELECTRIC SHOCK. D

22、O NOTEXPOSE THIS EQUIPMENT TO RAIN OR MOISTURECAUTIONRISK OF ELECTRIC SHOCKDO NOT OPEN120V60Hz250WBU-150DigitalTechnologyPowered Subwoofer180o0oMin50Max150LevelLowPassRRRLLLPowerPhaseSPKRINSPKROUTLine Input123546When connecting your subwoofer make sure you turnall the power off.There are several way

23、s to connect your subwoofer.Read this section carefully to determine which methodis best suited for your installation.The subwoofer may be fed directly with a low-levelsignal taken from a preamplifiers output by using thesecond set of output jacks on the rear of thepreamplifier (See Figure 1). If a

24、preamplifier has onlyone set of outputs, you may use two (2) “Y” connectors(See Figure 2) to connect the subwoofer.Usestandard shielded leads terminated at each end withmale RCA connectors.Connect one end of eachstereo pair of leads to the preamplifiers left and rightoutputs and connect the other en

25、d to thecorresponding left and right LOW-LEVEL INPUTS (1)on the subwoofer.If you are using a tube preamplifier and the connectingleads will be longer than 10 feet (3 meters), werecommend not using the above connection method. Atube preamplifier may not be able to handle thecapacitance introduced by

26、leads more than 10 feet inlength.Instead, try using the high-level connectionmethods listed on pages 5-7.Figure 1.- A low-level signal can be used from apreamps output by connecting second set ofoutput jacks to the rear of your amplifier.Figure 2.- You can use this method (2“Y”connectors) if your pr

27、eamp has only one setof outputs.7Amplifier/SubwooferBU-150BU-150 CONNECTIONSWhen using a single subwoofer, you MUST use a pair of stereo low-level leads from your preamplifiers outputs. When usingtwo subwoofers, one for the left and another for the right channels, connect the left preamplifier outpu

28、t to BOTH the left andright LOW-LEVEL INPUTS of the subwoofer used for the left channel by using a Female-to-Male “Y” connector at thesubwoofers output. Connect the right-channel preamplifier output to both jacks of the right-channel subwoofer in the samemanner (See Figure 3). If the preamplifier ha

29、s a mono subwoofer output, youll also need a Male-to-Female “Y” connector tosplit the mono signal to the subwoofer pair (See Figure 3).Figure 3.- Use this method when using single subwoofer or two subwoofers.The subwoofer may be connected to your system using theHIGH-LEVEL INPUTS (4) on the plate lo

30、cated on the rearpanel of the subwoofer.Use speaker wire, maintainingproper polarity (+ to + and - to -). Attach the speaker wire tothe left and right HIGH-LEVEL INPUTS on the subwooferand the other ends to the proper left and right OUTPUTS onyour amplifier or receiver (See Figure 4).If you plan to

31、use two subwoofers (one for the left and theother for the right channel), connect wires from the left andright OUTPUT on your power amplifier or receiver andattach the other ends to the corresponding HIGH-LEVELINPUTS on each subwoofer. Observe polarity (See Figure6).Figure 4.- Use this method when u

32、sing a singlesubwoofer.8Amplifier/SubwooferBU-150Figure 5.- Use this method when using twosubwoofers.Figure 6.- Use this method when connectingone subwoofer to satellites.Depending on whether you are using one or twosubwoofers, connecting your satellites can beaccomplished in one of two ways. If you

33、 are using asingle subwoofer with a pair of satellites, connectthem as shown in Figure 7.9Amplifier/SubwooferBU-150Figure 7.- Use this method whenconnectingtwosubwooferstosatellites.If you are using two subwoofers as astereo pair with a pair of satellites, connectthem as shown in Figure 7.The subwoo

34、fer has a variable frequencycontrol that can be used to block unwantedfrequencies (between 50 - 150Hz) frombeing reproduced by the subwoofer.When you set this control depends on thelow-frequency capabilities of your satellitespeakers.Adjust this knob to the lowestfrequency that you satellite speaker

35、s weredesigned to reproduce (refer to Operation,step 7).10Amplifier/SubwooferBU-150OPERATIONSetting the Controls1. Initially set the subwoofers Volume control to the minimumposition.2. Initially set the subwoofers Crossover Frequency control to12 oclock.3. Set the subwoofers Phase switch to the “NOM

36、” positionTurn the Power On4. Turn on the entireaudio system and play any musicsource.5. Turn the Volume control to its mid position.If no soundemanates from the subwoofer, check the AC line cord andinput cables. Are the connectors on the cables making propercontact? Is the AC plug connected to a “l

37、ive” receptacle?Adjusting the Volume6. Set the overall volume control of the preamplifier or stereoto a comfortable level. Adjust the subwoofers Volume controluntil you obtain a pleasing blend of bass.Bass responseshould not overpower the room but rather be adjusted sothere is a harmonious blend acr

38、oss the entire musical range.Many users have a tendency to set the subwoofer volume tooloud following the belief that a subwoofer is there to producelots of bass. This is not entirely true. A subwoofer it there toenhance bass, extending the response of the entire systemso the bass can be felt as wel

39、l as heard. However, overallbalance must be maintained; otherwise, the music will notsound natural. An experienced listener will set the volume ofthe subwoofer so its impact on bass response is always therebut is never obtrusive.The Crossover Frequency Controls7. The Crossover Frequency control sets

40、 the high-frequencyroll-off, adjustable from 50 to 150Hz.Where you set thiscontrol depends on the low-frequency capabilities of yoursatellite speakers, system placement, and other factorsaffecting the mid-bass region.Turn the control UP(clockwise) until you feel there is too much mid-bassinformation

41、 (around 100Hz), then back the control down a bituntil that area sounds more natural. To hear more low bass,turn the Crossover Frequency control DOWN a bit and theVolume control UP by about the same amount.This willincrease low bass while leaving the mid-bass sounding thesame as it did before the ad

42、justment.To reduce low basswithout changing midbass, turn the Crossover Frequencycontrol UP and the Volume control DOWN. Switch the Phaseswitch between “NOM” and “REV” positions while listening tomusic.The selection that sounds the best is the correctadjustment for your system.Room Placement8. The r

43、oom placement of the subwoofer is the most criticalaspect of its installation. It will be necessary for you to tryvarious locations in your listening room before you choosethe final location.Some possible starting points include:behind the right channel satellite speaker, along the backwall between

44、the satellites, along a side wall (but not tooclose to a corner), or behind a couch or a chair.In general, the closer the subwoofer is to wall and corners,the greater the effect of low-frequency enhancement.Experiment with the Crossover Frequency and Volumecontrols in different locations until you a

45、re pleased with theresult you obtain from your particular application.A Word of AdviceThe Low-Frequency Roll-off and Volume controls may beset anywhere within their rotation. However, it will be a mostunusual circumstance if you have to set the Volume controlcompletely clockwise.This may indicate an

46、 unbalancedcondition in your system (too much bass) or an especiallylarge room, or room placement may not be correct.Tryseveral other locations before concluding that the Volumecontrol must be set at maximum.A Word About Tone ControlsThe tone controls on your electronic components(preamplifier, rece

47、iver, etc.) should be used with the utmostdiscretion.Excessive boost can create severe powerdemands on your power amplifier.Maximum bass boostcan create a demand for literally hundreds of watts in thebass region, whereas in the “flat” position, or with the tonecontrols switched out of the system, yo

48、ur average listeninglevel may be impressively and realistically loud at less than10 watts.The remaining power capacity required is onreserve for power peaks on sharp transients and powerfulcrescendos.11Amplifier/SubwooferBU-15012Amplifier/SubwooferBU-150BU-150 TEST SET UP AND PROCEDURETO REDUCE THE

49、RISK OF ELECTRIC SHOCK. DO NOTEXPOSE THIS EQUIPMENT TO RAIN OR MOISTURECAUTIONRISK OF ELECTRIC SHOCKDO NOT OPEN120V60Hz250WBU-150DigitalTechnologyPowered Subwoofer180o0oMin50Max150LevelLowPassRRRLLLPowerPhaseSPKRINSPKROUTLine InputOUTPUTFROMAMPLIFIEROUTPUTFROMAMPLIFIERFROM PRE AMPFROM PRE AMPAMPLIFI

50、ERCD PLAYERPRE AMPAC VOLT METER ( 6V )BU-150UNDER TESTLINE LEVELSPEAKER LEVELGeneral FunctionUUT = Unit Under Test1.Connect both right and left line level inputs (RCA) to signalgenerator and UUT. Use Y-cable if necessary frommono source. VOLUME control should be full counterclockwise.2.Turn on gener