ElectroVoice-EV7300-pwr-sch维修电路原理图.pdf

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1、EElectroVoicei7300.-.STEREO POWER AMPLIFIEROWNERSMANUALII(7300STEREOPOWERAMPLIFIERMATERCOpyRadioFans.CN 收音机爱 好者资料库I.INTRODUCTIONTheEV7300wasdesigned to deliver exceptionalperformance and reliabilityatanaffordable price.Eachchannel delivers 200 watts of power into 8ohms,and300 watts into 4 ohms over

2、the full audio frequencyrange.Inthe mono bridge mode, the 7300 can deliverover 600watts.TheAPXoctal crossover accessory provides theconvenience of on-board, bi-amp capability.TheAPXmodule has 24 preset selectable crossover frequenciesfrom50Hzto10,000Hz.Simply plug the moduleintothe octal sockets pro

3、videdonthe rear of the amplifierand your systemisbi-amp ready.The 7300isanadditiontothe growing family ofElectro-Voice electronic products. We would appreciateanycomments you have regarding the performance,features or reliability of the 7300.(RadioFans.CN 收音机爱 好者资料库IEtl7300STEREOPOWERAMPLIFIERTABLE

4、OF CONTENTSTable01ContentsINTRODUCTION1.DESCRIPTION -FRONT PANEL1A.Power Switch1B.Power Status Indicator1C.Channel Attenuation10.Clip Indicator1E.Protect Indicators2.DESCRIPTION -REAR PANEL2A.Input Connectors2B.Octal Input Sockets2C.Dual Bridge Mode20.Output Connectors3.SPECIFICATIONS4.INSTALLATION4

5、A.Operating Cautions4B.Input Connections4C.Output Connections40.Grounding4E.Ventilation5.OPERATION5A.Dual/Stereo Mode5B.Bridge Mod5C.APX Crossver Option50.Alternate Operating Voltage6.TROUBLESHOOTING6A.Protection7.SCHEMATIC8.SERVICE/WARRANTY INFORMATION*WARNING*The service information contained with

6、in this documentisfor useonly by Electro.Voice, Inc. authorized warranty stations andqualified service personnel.nnAIE17300STEREOPOWERAMPLIFIER1C.1A.Description1E.10.18.FIGURE 1 -Front Panel ViewDESCRIPTION1.Front Panel1A.Power Switch -The power switch turns theamplifieronandoff.1B.Power Status Indi

7、cator -ThisLEDindicateswhen the unit ison.1C.Input Attenuators -Clockwiserotationincreasesthe amount of amplifier gain.1D.Clip Indicators -Whenthe amplifierisdriven intoc1ipping,the clip indicatorwillilluminate.Toavoiddistortion reduce the inputleveluntilthe LEDs nolonger light.1E.Protect Indicators

8、 -Theprotect light illuminateswhen the amplifier overheats or when shortedloads ordcisdetectedonthe amplifier output.A relay automatically disconnects the load fromthe channel when a problemisdetected. Theamplifier will reset itself when the problemiscorrected. See the Troubleshooting section forpro

9、blem solving.(IEtl7300STEREOPOWERAMPLIflER28.20.Descrlptlon(2A.2C.FIGURE 2 -BackPanelViewDESCRIPTION2.Back Panel2A.Input Connectors -Locatedontheleft sidearetwo 3pinXLR-type connectors and two balancedquarter-inch phone jacks: The inputs can also beunbalanced.SeeFigure3for typicalinputconnections.2B

10、.Octal Accessory Sockets -Located above theinput jacks, accesscry octal socketsareprovidedfor theAPXcrossover module. Twenty-fourcrosscver frequencies are available from 50Hzto 10,000Hz.2C.Dual/Mono BridgeMode-The mode switchlocated to the rightcfchannel 1 input selectsstereomodeerbridge-modewithout

11、anyadditional patching.2D.Output Connectors -The speaker connectorsare heavy-duty five-waybindingposts.Forprotection, thereisa bracket on each sideofthebinding posts.117300STEREOPOWERAMPLIFIERSPECIFICATIONSSpecificationsRFinterferenceOver temperatureCONDITIONS -1,0dBu.0.775 Vrms.2,Dualmode ratingsar

12、eforeach channel.3.Bothchannels operatingatrated outputpowerunlessnoted.4.120 volt aclinevoltage maintained throughouttesting.CONTINUOUS RATED OUTPUTPOWER-(20 Hz, referenee 1 kHz)Dual Mode, 4 Ohms:300wattsat0,10%THDBridgeMode,8Ohms: 600 wattsat0.10%THDDual Mode, 8 Ohms: 2oo,wattsat0.05%THDBridgeMode

13、, 16 Ohms:400wattsat 1.25 dBBridgeMode, 8 Ohms: 1.25 dBDual Mode, 8 Ohms: 1.0dBBridgeMode,16Ohms: 1.0dBPOWERBANDW10TH(+0,- 3 dB, reference 0 dBat1 kHz) -Dual Mode, 4Ohms: 7Hz-70kHzBridgeMode, 8 Ohms: 7Hz-60kHzDual Mode, 8 Ohms: 7Hz-85kHzBridgeMode, 16 Ohms: 7Hz-65kHzVOlTAGE GAIN (reference 1 kHz) -D

14、ual Mode: 32.0 dBBridgeMode: 38.0 dBINPUT SENSITIVITYFORRATED OUTPUTPOWER-(referenee 1 kHz,0.3 dB)Dual Mode, 4 Ohms: 0 dBu (0.775 Vrms)BridgeMode, 8 Ohms: 0 dBu (0.775 Vrms)Dual Mode, 8 Ohms: + 3 dBu (0.902 Vrms)BridgeMode, 16 Ohms: + 1.3 dBu (0.902 Vrms)MAXIMUM INPUTlEVEL(referenee 1 kHz) -+20dBu (

15、7.75 Vrms)INPUT IMPEDANCE (per ehannel, 20 Hz-20kHz)-Balaneed: 30kilohmsUnbalanced: 15kilohmsPHASE RESPONSE (at ratedoutputpower, any mode) -at20 Hz: +15degreesat20kHz:-15degreesTHD (at ratedoutputpower)-Dual Mode, 4 Ohms, 20 Hz-20 kHz: 0.10%BridgeMode, 8 Ohms, 20 Hz-20 kHz: 0.10%Dual Mode, 8 Ohms,

16、20Hz1kHz: 0.01%Dual Mode, 8 Ohms, 1 kHz20 kHz: 0.05%BridgeMode, 16 Ohms, 20Hz1kHz: 0.01%Bridge.Mode, 16 Ohms, 1 kHz20 kHz: 0,05%IMDSMPTE1(at ratedoutputpower) -Dual Mode, 4 Ohms: 0.05%.BridgeMode, 4 Ohms: 0.05%Dual Mode, 8 Ohms: 0.03%BridgeJAode,16 Ohms:0.03%TIM OlM1001(at ratedoutputpower) -Dual Mo

17、de, 4 Ohms: 0.05%BridgeMode, 8 Ohms: 0.05%Dual Mode, 8 Ohms: 0.03%BridgeMode, 16 Ohms: 0.03%AlSE TIME (10%tc90%,strstedoutputpower)Dual Mode, 4 Ohms: 5IJ.secBridgeMode, 8 Ohms:6llsecDual Mode, 8 Ohms: 4.5IlsecBridgeMode, 16 Ohms:20VfJJsecBridgeMode, 8 Ohms:30VflJ.secDual Mode, 8 Ohms:30VflJ.secBridg

18、eMode,16Ohms:60VflJ.secDAMPING FACTOR -Dual Mode, 4 Ohms,20Hz-1kHz: 100Dual Mode, 4 Ohms,20kHz: 40Bridge Mode, 8 Ohms, 20 Hz1 kHz:200Bridge Mode, 8 Ohms, 20 kHz: 50Dual Mode, 8 Ohms,20Hz-1kHz: 200Dual Mode, 8 Ohms,20kHz: 80Bridge Mode, 16 Ohms, 20Hz-1kHz:400Bridge Mode,16Ohms, 20 kHz: 100CHANNEl SEP

19、ARATION -(below ratedoutputpower,singlechanneloperatlng)80dBattkHzNOISE (below rated outputpower,A.welghted,any mode) _100dBAMPLIFIER PROTECTION -Excessiveoutput voltageShorted loadsExcessivephaseshiftLOAD PROTECTION -Startup/shutdowntransientsInfrasonic signalsdcfaultLowac!inevoltageCOOLING -Heatsl

20、nk: Thermallyequafized3AG-inchaluminum,black anodized heatsinkDual-Speed Fan:106CFM(high speed), minimumIiferatingof20,000 hoursat72C, or 43,500 hoursat25C ambient temperatureOUTPUT TOPOlOGY -True complementary symmetryOUTPUT TYPE -Dual Mode: Unbalanced, each channelBridge Mode: BalancedOUTPUT DEVIC

21、ES -Sixteen25O-watt,250-Vf16-A,TO-3transistorsCONTROlS AND SWITCHES -Inputlevelcontrolstwo),rearModeswitch,rearPowerswitch,frontFRONT-PANEL INDICATORS -PowerLED.CfipLEDs(two)!Protect LEDs(two)CONNECTIONS -Input:6-terminal barrier strip, female XLRtype connectors(two)Output: 4terminal barrier stripPo

22、wer:8-foot,3-wire,17-GApower cord with NEMA5-15plugPOWER REQUIREMENTS -100,120,200,220,240Vac,50/60Hz,900 wattsPOWER CONSUMPTION/HEAT PRODUCED -(both channeIs operating dualmodewlth 1 kHz Input signalatstated output power Imo 4 ohms,orbridge mode Into 8 ohms)Idle:130wattsf0.442kBTU/hrY3Power:900watt

23、sf2.380kBTUfhrY2Power: 1060 wattsl2.584 kBTU/hrRated Power: 1430 wattsl2.822 kBTUfhrMaxlmum.Mldband Power: 960watts/1.564kBTUfhrOPERATING TEMPERATURERANGE-Upto60C (140F)ambientDIMENSIONS -Helght:13.3cm(51/4in.)Wldth: 48.2cm(19in.)Depth:32.4cm(123/4in.)COLOR -Gray/blackENCLOSURE -Rackmountchassis,16-

24、GAsteelbottomfsides,V,G-inchaluminum topfback,3AGinch6061-T6 aluminum frontpanelSHIPPING WEIGHT -21,8kg(48Ib)NET WEIGHT -17.7kg(39Ib)(I.,:-,(i.i,IEtl7300STEREOPOWERAMPLIFIERI.APUlKlCAJHLElIJ.(dBu)vsFllEQ(H.).,.:.:.,.,.-.,.:37.M.,.:.,.,-36.M.,.i.,.v.K1._,.1.-:.:.131.M.,.:.:.,.,.,.i.i.,.28.M.H.,.,.,.0

25、.,-.,i,.,.25,M.,.;.:i,.,.I.,.i.I.G.,:-.ulQ .ik18klIMikLEVELVS.FREQUENCYAP2688HtliDROOlILIUlJ.ldih)vsFllEQIHz).,.IUM,.,.i.i.i.,.:.ONECHANNELOPERATING.-v-i.I.IXi.,.,.,.-./_.-/:.i.:-.1.82il .j;g,.iilkHEAOROOMVB.FREQUENCYFrequencyCurvesLEVEL+PHASEVB.FREQUENCY=.AP261l11Atd-HoisoBAtQ)PA$SIdih)vsrllEll(H.)

26、i.IVV.G-A-./V-.I,.G./;.:.i.i ./i:.8V.,.,.,.:.I,i:Tuk,.28iIi.ilkNO!SEVB.FREQUENCY7300STEREOPOWERAMPLIFIERInstallationLOADSHote1,Notrlcomm.ndedrar cablerun,Ollt(100fIl30mlNole2,Notrecomm.nded foretblerun.over IfI(2mlCH.2Dual ModeCH.1CH.2-_HIGHSCompresslonDriverf-.-1+FIGURE3 -Typical Input Connections4

27、.INSTALLATION4A.Operating Cautionsa.Danot operatetheamplifierina completelyc1osed,unventilated housing.b.Danot connecttheoutputs ofthechannelsinparallel.c.Danot connecttheoutputterminalstoa battery, powersupply, or the power mains. Damage caused by suchhookupisnot covered by the warranty.d.Becareful

28、 when making connections, selecting signalsources and controlling the outputlevel.e.Danot ite the input signal groundtotheground leadofanoutput. Ground-loop-induced oscillations mayoccur.f.Ensure that the main ac poweriswithin 10% ofselected voltageandfrequency.Failuretooperate theunit within these

29、limits voids the warranty.g.Use only the proper sizemainsfuseforthe selectedac voltage.h.Da not connect either side of the loudspeaker cableto ground when operating the unitinbridged mode.The bridged modeisbalancedtoground.i.Make certain that test equipmentisnot graundreferenced when testing the uni

30、tinthebridged mode.j.Tampering withthecircuit er repair by unauthorizedpersonnel will void the warrantyoftheunit.slxFIGURE4 -Typical Output Connections4B.Input ConnectionsTwo conductor shielded low-impedance cableisrecom-mended for input lines to the amplifier input.Pin2OftheXLRtype connectorishigh(

31、+),pin 3islow(-),andpin 1isground.TheV4-inchjack may be usedasa lowimpedance input. Tipishigh(+),ringislow(-).and thesleeveisground.SeeFigure3.High impedancelinesmay be connected to the amplifierinputs with a single-conductor low capacitance sheildedcable of 30 feet orlessiniength. A two conductor1/

32、4-inchplug will automatically unbalance the input. To help avoidhum or buzzinthe output, be certain thatallinput cablesfrephysically separated from power wiring er powertransformers.4C.Output ConnectionsBinding posts are provided for speaker terminations, theredpostishigh (+)andtheblack postislow (-

33、).Thepreferredconnectorisa high quality dual banana plug. See Figure 4for typical output configurations.Before making output connections, the input attenuatorsshould be turned off (full counterclockwise), doingsowilleliminate any chance of loudblastscrdamage to theloudspeaker.Power loss in the speak

34、er wire. The impedanceofthespeaker connecting wire would ideally be zero, soallof theamplifier output power would be deliveredtothe speakerload. However,theimpedance of the speaker wire canbecome a significant percentageofthe speaker impedance.Thus, partofthe amplifier powerislostinthe wire(inthefor

35、mofheat)andthepower delivered to the speaker systemIE1!1730oSTEREOPOWERAMPLIFIERImpedanceAWGReslstanceSize(ohms/1000 feet)4080160101.00.120240480121.5975150300142.504896190164.023060120186.391938752010.11224482216.271530TABlEI -Cable Selection Chartiscorrespondingly reduced. Wire impedanceishigher w

36、henusing long wire runs and small wire sizes.TableI showsthetwo-wirecable(copper)lengthspermissablefora number of wire sizes and speakerimpedances, to avoid a loss of more than 0.5 dB.Fora lossof 1 dB (basically imperceptible) lengths maybedoubled. For a 2-dB loss, the lengths wouldbemultiplied by 4

37、.4.Ingeneral, note that the higher load impedances allow muchlonger smaller-gauge wiring to be used,40.GroundingThe chassisofthe unit shouldbegrounded. Connecting thechassis grounds of additional audio equipmenttothechassisground of the amplifier may help reduce noise and hum.4E.VentilationInorder t

38、o offset the heat generated by the power amplifier,itisnecessary to provide ample ventilation around the unit.Avoid blocking or impeding the vent slots of thechassis.Locatetheunit where itisfree from direct sunlight, humidity,dust or vibration to help prevent problemswhich might becausedbythe enviro

39、nment.5.OPERATION5A.Dual/Stereo Mode:In the dual or stereo mode the channels may be operatedindependently. Before hook-up .make sure that the modeswitchisinthe dual position and that the level controls aredown(FCCW).Connect the inputs and outputs (SeeFigures 3 and4).Turn the power amponand slowlyinc

40、rease level until the desired output powerisobtained.lf either (clip) LED iltuminates, reduce the output with theinput attenuators or reduce the source signal level.5B.Bridge Mode:Input connection shouldbemade into channel1 only.00not make any input connections into channeltwo.Move themode switch to

41、 bridge mode and make sure both levelcontrolsaredown(FCCW).Connect the speaker acrossthetwo red binding posts. Channel 1 red postishigh(+),channel 2 red postislow (-).00not make a connectionOperationtoeither of the black binding posts, Switch poweronandslowly increase amplifier channel 1 level contr

42、ol until thedesired output powerisobtained,Ifthe clipLEOindicatorscomeon,reducethepower amp level control or the sourcesignal level.5C.APX Crossover Option:TheAPXcrossoverisa24dB per octave Linkwitz-Riley filternetwork. There are24selectable frequencies from 50 Hzto 10,000 kHz,*CAUTION*No user servi

43、ceable parts inside. Hazardous voltageandcurrentsmay be encounteredwithinthe chassis.Toavoid electric shock, donotperformany servicingunless you are qualified todoso.50.Alternate Primary VoltageThe amplifier can be powered with line v6ltages other than120 volts by altering the primary wiring of the

44、powertransformer. Table Illiststhe primary wire color, the terminalblock(TB),and the position of theTBthe wire should belocatedinfor operation at the desired voltage.To alter the transformer primary wiring configurationusethefollowing procedure:1.Oisconnect the amplifier from the ac power source.2.R

45、emove thetenscrews securing the top cover. Thereare three screws on each side; two screws on the rearalong the bottom edge, and the two innermost screwsinset into the top strip on the front panel. See Figure 5for exact screw locations.3.Discharge each large capacitor carefully through a150-ohm, 2-wa

46、tt resistor foratleast one minute.See Figure6.4.Locatethetwovoltage-selectionterminalblocksmounted next to each otheronthe side of the chassisbetween the power transformer and the large capacitor.5.The transformer has six primary leads. Disconnect theprimary leads of the power transformer by pulling

47、 eachwire firmly to disengage it from the terminal block.Note: The primary lead colors are black, brown, white,black/white, brown/white and white/black.6.Select the desired operating voltage on Table11andreconnect the wires accordingly. Push each wire firmlyinto the block untilitsnaps into place.7.R

48、elocate the fan wires according to the wiring chart.8.Install the correct line fuse (valuesinTable111).9.Plug the amplifier into a variac and sweep the mainsvoltage fromzerotofulloperating voltage while monitor-ing the amplifiers dcrailvoltages. The dcrailvoltageshould be78V dc,5%at the selected pri

49、maryvoltage.10.Reinstall the top cover with the ten screws.117300STEREOPOWERAMPLIFIER(100VTBITB25FAN(YL)WHWH/BLK7FAN(YL)8BRNIWH9BRN0240VTBITB2TBIT82TBITB2220Vo0o0Factory Wlrlng (120 V)200V1UNEGAP(BLK)2 NEUTRAL (WH)TBITB2o0o0o0TBlTB2PermanentConnections(BLK)PWRSW(BLK) UNECAP(BLK)FUSE(BLKIPWRSW DaNOTM

50、OVETHESEWIRES,THEYARECOMMONTaAllPRIMARYVOLTAGESTABLE11Prlmary Power Converslon Chart for100, 120-, 200-, 220-,and240-V, 50/60-HzOperation3SCREWSLtUPPER2SCREWSFIGURE5 -Top Cover Removal3SCREWSJUneFuse.314SerleslIneVOltag8NormalBlo100Vac10Al250V120Vac10Al250V200Vac5Al250V220Vac5Al250V240Vac5Al250VTABL