Infinity-BU120revD-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 D 11/2000BU-120/HTS-20Powered 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 th

2、e risk of 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 swit

3、ch. Hazardous 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 exce

4、ed ratedvoltage by more than 10%: operation below 90% of ratedvoltage will cause poor performance or may shut the unit off.List of SafetyComponents RequiringExactReplacementsF1Fuse SLO BLO 1.0A 250V 20mm.UL approvedPWRCORDSPT- 2 or better with polarized plug, ULapproved wired with the hot side to fu

5、sed side.Use with factory replacement panel strain reliefonly.T1Transformer. Use only factory replacement.DBR or D1Bridge diode. Use only factory replacement.C1, 24700uF, 50V electrolytic filter caps. Be surereplacement part is at least the same workingvoltage and capacitance rating. Also the leadsp

6、acing is important. Incorrect spacing maycause premature failure due to internal cabinetpressure and vibration.C610uF 50V electrolytic radial* BU120 and HTS- 20 rev. A only.S53AMI or CN1Power output module. Use only factoryreplacementFaceplateFaceplate. Use only factory replacementAir leak coverUse

7、only factory replacementCMC1Use only factory replacementL1Use only factory replacementFuse PCBUse only factory replacementMain PCBUse only factory replacementR29470 .25W METAL OXIDE, non flammableLeakage/Resistance CheckBefore returning the unit to the customer, perform a leakageor resistance test a

8、s follows:Leakage Current. Note there is no power switch on this unit.When the power plug 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 leakagecur

9、rent exceeds 0.5mA, the unit is defective. Reverse thepolarity of the AC supply and repeat.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

10、 tests until the problem is located and corrected.2Amplifier/SubwooferBU-120/HTS-20*See Service Bulletin (INF2000-01) page 15.RadioFans.CN 收音机爱 好者资料库3Amplifier/SubwooferBU-120/HTS-20GENERAL SPECIFICATIONSFrequency Response ( 3dB) . . . . . . . . . . . . . . . . . 30Hz 150HzOutput (RMS). . . . . . .

11、. . . . . . . . . . . . . . . . . . . . . . 150WDriver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 WooferCrossover Frequency . . . . . . . . . . . . . . . . . . . . . . . 50Hz 150Hz (continuously variable)Dimensions (H x W x D) . . . . . . . . . . . . . . . . . . . . . 14

12、(36.8cm) x 14 ? (36.8cm) x14 ? (36.8cm)Add 1 ? (4.5cm) for feet.Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 lbs/19.5 kg,Refinements may be made on occasion to existing products without notice,but will always meet or exceed original specifications unless otherwise sta

13、ted.TABLE OF CONTENTSSAFETY INFORMATION.2GENERAL SPECIFICATIONS.3DETAILED SPECIFICATIONS .4CONTROLS AND THEIR FUNCTION .6BU- 120/HTS- 20 CONNECTIONS.7OPERATION .11BU- 120/HTS- 20 TEST SET UP AND PROCEDURE .12BU- 120/HTS- 20 POWER AMP MODULETESTING FLOW CHART .13SERVICE BULLETIN INF9902 - APRIL 1999

14、.14SERVICE BULLETIN INF2000- 01 - JANUARY 2000.15TECH TIPS .16BU- 120/HTS- 20 PACKING & CABINET ASSEMBLY.17BU- 120/HTS- 20 AMPLIFIER ASSEMBLYEXPLODED VIEW .18BU- 120/HTS- 20 rev. A PCB (revision 3.52)Component Side Trace.20BU- 120/HTS- 20 rev. A PCB (revision 3.52)Solder Side Trace.21BU- 120/HTS- 20

15、 rev. A PCB (revision 3.53)Component Side Trace.22BU- 120/HTS- 20 rev. A PCB (revision 3.53)Solder Side Trace.23BU- 120/HTS- 20 ELECTRICAL PARTS LIST.24BU- 120/HTS- 20 IC DIAGRAMS .25BU- 120/HTS- 20 SCHEMATIC 1 of 2 .26BU- 120/HTS- 20HTS- 20 REV B ELECTRICAL PARTS LISTSCHEMATIC 2 of 2 .27.28HTS- 20

16、REV B SCHEMATIC.33HTS- 20 REV B CIRCUIT BOARDS.31REGARDING SERVICE FOR THE INFINITY HTS- 20 SUBWOOFERThere are two versions, an A and B, with minor internal differences.Data for both versions is included, and differences noted in the following pages.Units can be identified for service as follows:?Am

17、plifier faceplate says Made in Canada on the A version.?Amplifier faceplate says Made in China on the B version.DETAILED SPECIFICATIONSLINE VOLTAGEYes/NoHi/LoLineNom.UnitNotesUS 120vac/60HzYes108-132120VrmsNormal OperationEU 230vac/50-60HzYes207-264230VrmsNormal operation, MOMSrequiredAsia 100vac/50

18、HzNo90-110100VrmsNormal OperationParameterSpecificationUnitQA TestLimitsConditionsNotesAmp SectionType (Class AB, D,other)Dn/an/aClass D Preferred.Sinkrequired for Class ABLoad Impedance(speaker)4Ohmsn/aNominalZ-curve requiredRated Output Power150Watts1501 input drivenTHD0.3%122k filter75w (Power Ba

19、ndwidth30-100Hz)THD 1 Watt0.5%0.822k filterDC Offset10mV-DC20 Speaker OutputsDamping factor100DF50Input SensitivityInput Frequency40HzNominal Freq.1 input drivenLine Input63mVrms2dBTo Rated Power/ Vol Max1 input driven: AP sourceZ = 600 ohmsSpeaker/Hi Level Input4.8Vrms2dBTo Rated Power/ Vol Max1 in

20、put driven: AP sourceZ = 25 ohmsSignal to NoiseSNR-A-Weighted100dBA90Relative to rated outputA-Weighting filterSNR-unweighted75dBr70Relative to rated output22k filterSNR rel. 1W-unweighted 65dBr55relative to 1W Output22k filterResidual Noise Floor3mVrms4Volume max, usingRMS reading on A/P22k filter

21、required due to100kHz switching noisepresent at speaker outputInput ImpedanceLine Input10kohmsn/aNominalSpeaker/Hi Level Input200ohmsn/aNominalFilters0dBr = 1w 50HzLow Pass (fixed orvariable)VariableLow Pass filter (point orrange)50-150Hz2dB-3dB PointSlope18-24dB/Octaven/aSubsonic filter (HPF)34Hz2d

22、B-3dB PointSlope24dB/Octaven/a4Amplifier/SubwooferBU-120/HTS-20Limiter (yes/no)yesMax. OutputPower/THD=10%150w/10%P-max/THDfunctionalMaximum Output PowerMaximum THD as a resultof limiting.FeaturesPhase Switch (yes/no)yesfunctionalVolume pot Taper(lin/log)linearfunctionalInput ConfigurationLine In(L,

23、C,R,AC3,Mono)L,RfunctionalEnabled w/Line/Spkr Input Select SwitchLine Outputs (L,C,R)L,RfunctionalBuffered Output /Pre-Volume controlSpkr/Hi Level In(L,C,R,mono)L,RfunctionalEnabled w/Line/Spkr Input Select SwitchSpkr Out: Hi Pass Filter100Hzfunctional8 ohm Satellite: 6dB/octpassive xoverDriven from

24、 zero ohmssource impedanceSignal-PresentLEDYesBi-Color LED(green=signal/ red=nosignal)Signal-Present InputFreq.100HzfunctionalNominal200uF Series Cap onPCBSignal-Present Level35mVfunctional100Hz into Line Input w/1 ch. drivenPower on Delay time2sec.AC Power AppliedTransients/PopsTurn-on/off Transien

25、t500mV-peak2v-pp Speaker OutputsAC Line cycled from OFFto ON or ON to OffEfficiencyStand-by Input Power14Watts nom. line voltagePower Cons.ratedpower110Watts nom. line voltageEfficiency136%Relative to rated outputProtectionShort Circuit ProtectionyesfunctionalDirect short at outputLineBU120HTS-20Fus

26、e Rating1.0AmpsType-T or Slo BloLine Fuse Rating2.0AmpsType-T or Slo Blo5Amplifier/SubwooferBU-120/HTS-20When connecting your subwoofer make sure you turnall the power off.There are several ways to connect your subwoofer.Read this section carefully to determine which methodis best suited for your in

27、stallation.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 preamplifier has onlyone set of outputs, you may use two (2) “Y” connectors(See Figure 2) to connect the su

28、bwoofer.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 end to thecorresponding left and right LOW-LEVEL INPUTS (1)on the subwoofer.If you are using a tube preamplif

29、ier 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 leads more than 10 feet inlength.Instead, try using the high-level connectionmethods listed on pages 5-7.Fi

30、gure 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 preamp has only one setof outputs.7Amplifier/SubwooferBU-120/HTS-20BU-120/HTS-20 CONNECTIONSWhen using a sing

31、le 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 output to BOTH the left andright LOW-LEVEL INPUTS of the subwoofer used for the left channel by us

32、ing 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 has a mono subwoofer output, youll also need a Male-to-Female “Y” connector tosplit the mono si

33、gnal to the subwoofer pair (See Figure 3).Figure 3.- Use this method when using a single subwoofer output or two subwoofers.The subwoofer may be connected to your system using theHIGH-LEVEL INPUTS (4) on the plate located on the rearpanel of the subwoofer.Use speaker wire, maintainingproper polarity

34、 (+ 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 use two subwoofers (one for the left and theother for the right channel), connect wi

35、res 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 Figure4).Figure 4.- Use this method when using a singlesubwoofer.8Amplifier/SubwooferBU-120/HTS-20Figure 5.- Use this method w

36、hen 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 are using asingle subwoofer with a pair of satellites, connectthem as shown

37、in Figure 6.9Amplifier/SubwooferBU-120/HTS-20Figure7.- Use this method whenconnectingtwo subwooferstosatellites.If you are using two subwoofers as astereo pair with a pair of satellites, connectthem as shown in Figure 7.The subwoofer has a variable frequencycontrol that can be used to block unwanted

38、frequencies (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 speakers weredesigned to reproduce (refer to Operation,step 7).10Amplifier/Su

39、bwooferBU-120/HTS-20HTS- 20 - Has no external control. If you areusing a receiver or surround processorcontaining a Dolby Digital and/or DTSdecoder, set the crossover bypass switchto On. If you are using a stereo or DolbyPro Logic receiver, set this switch to Off;this places the preset roll- off cro

40、ssoverfrequency point at 100Hz.BU- 120OPERATIONSetting the ControlsTurn 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 cabl

41、es making propercontact? Is the AC plug connected to a “live” receptacle?Adjustingthe 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

42、but rather be adjusted sothere is a harmonious blend across 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 res

43、ponse of the entire systemso the bass can be felt as well 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 F

44、requency Controls (BU1207. The Crossover Frequency control sets 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

45、 UP(clockwise) until you feel there is too much mid- bassinformation (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

46、 while leaving the mid- bass sounding thesame as it did before the adjustment.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

47、 best is the correctadjustment for your system.Room Placement8. The room 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:be

48、hind the right channel satellite speaker, along the backwall between 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 Cro

49、ssover Frequency and Volumecontrols in different locations until you are 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

50、 have to set the Volume controlcompletely clockwise.This may indicate an 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 Co