ElectroVoice-EV7300-pwr-sch 电路图 维修手册.pdf

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1、E ElectroVoice i7300. -.STEREO POWER AMPLIFIER OWNERSMANUAL II ( 7300 STEREOPOWERAMPLIFIER MATERCOpy RadioFans.CN 收音机爱 好者资料库 I.INTRODUCTION TheEV7300wasdesigned to deliver exceptional performance and reliabilityatanaffordable price.Each channel delivers 200 watts of power into 8ohms,and 300 watts in

2、to 4 ohms over the full audio frequency range.Inthe mono bridge mode, the 7300 can deliver over 600watts. TheAPXoctal crossover accessory provides the convenience of on-board, bi-amp capability.TheAPX module has 24 preset selectable crossover frequencies from50Hzto10,000Hz.Simply plug the moduleinto

3、 the octal sockets providedonthe rear of the amplifier and your systemisbi-amp ready. The 7300isanadditiontothe growing family of Electro-Voice electronic products. We would appreciate anycomments you have regarding the performance, features or reliability of the 7300. ( RadioFans.CN 收音机爱 好者资料库 IEtl

4、7300STEREOPOWERAMPLIFIER TABLE OF CONTENTS Table01Contents INTRODUCTION 1.DESCRIPTION -FRONT PANEL 1A.Power Switch 1B.Power Status Indicator 1C.Channel Attenuation 10.Clip Indicator 1E.Protect Indicators 2.DESCRIPTION -REAR PANEL 2A.Input Connectors 2B.Octal Input Sockets 2C.Dual Bridge Mode 20.Outp

5、ut Connectors 3.SPECIFICATIONS 4.INSTALLATION 4A.Operating Cautions 4B.Input Connections 4C.Output Connections 40.Grounding 4E.Ventilation 5.OPERATION 5A.Dual/Stereo Mode 5B.Bridge Mod 5C.APX Crossver Option 50.Alternate Operating Voltage 6.TROUBLESHOOTING 6A.Protection 7.SCHEMATIC 8.SERVICE/WARRANT

6、Y INFORMATION *WARNING* The service information contained within this documentisfor use only by Electro.Voice, Inc. authorized warranty stations and qualified service personnel. nnA RadioFans.CN 收音机爱 好者资料库 IE17300STEREOPOWERAMPLIFIER 1C.1A. Description 1E.10.18. FIGURE 1 -Front Panel View DESCRIPTIO

7、N 1.Front Panel 1A.Power Switch -The power switch turns the amplifieronandoff. 1B.Power Status Indicator -ThisLEDindicates when the unit ison. 1C.Input Attenuators -Clockwiserotationincreases the amount of amplifier gain. 1D.Clip Indicators -Whenthe amplifierisdriven into c1ipping,the clip indicator

8、willilluminate.Toavoid distortion reduce the inputleveluntilthe LEDs no longer light. 1E.Protect Indicators -Theprotect light illuminates when the amplifier overheats or when shorted loads ordcisdetectedonthe amplifier output. A relay automatically disconnects the load from the channel when a proble

9、misdetected. The amplifier will reset itself when the problemis corrected. See the Troubleshooting section for problem solving. . ( I Etl7300 STEREOPOWERAMPLIflER 28.20. Descrlptlon ( 2A.2C. FIGURE 2 -BackPanelView DESCRIPTION 2.Back Panel 2A.Input Connectors -Locatedontheleft sideare two 3pinXLR-ty

10、pe connectors and two balanced quarter-inch phone jacks: The inputs can also be unbalanced.SeeFigure3for typicalinput connections. 2B.Octal Accessory Sockets -Located above the input jacks, accesscry octal socketsareprovided for theAPXcrossover module. Twenty-four crosscver frequencies are available

11、 from 50Hz to 10,000Hz. 2C.Dual/Mono BridgeMode-The mode switch located to the rightcfchannel 1 input selects stereomodeerbridge-modewithoutany additional patching. 2D.Output Connectors -The speaker connectors are heavy-duty five-waybindingposts.For protection, thereisa bracket on each sideofthe bin

12、ding posts. 117300STEREOPOWERAMPLIFIER SPECIFICATIONS Specifications RFinterference Over temperature CONDITIONS - 1,0dBu.0.775 Vrms. 2,Dualmode ratingsareforeach channel. 3.Bothchannels operatingatrated outputpowerunlessnoted. 4.120 volt aclinevoltage maintained throughouttesting. CONTINUOUS RATED O

13、UTPUTPOWER- (20 Hz, referenee 1 kHz) Dual Mode, 4 Ohms:300wattsat0,10%THD BridgeMode,8Ohms: 600 wattsat0.10%THD Dual Mode, 8 Ohms: 2oo,wattsat0.05%THD BridgeMode, 16 Ohms:400wattsat 1.25 dB BridgeMode, 8 Ohms: 1.25 dB Dual Mode, 8 Ohms: 1.0dB BridgeMode,16Ohms: 1.0dB POWERBANDW10TH(+0,- 3 dB, refere

14、nce 0 dBat1 kHz) - Dual Mode, 4Ohms: 7Hz-70kHz BridgeMode, 8 Ohms: 7Hz-60kHz Dual Mode, 8 Ohms: 7Hz-85kHz BridgeMode, 16 Ohms: 7Hz-65kHz VOlTAGE GAIN (reference 1 kHz) - Dual Mode: 32.0 dB BridgeMode: 38.0 dB INPUT SENSITIVITYFORRATED OUTPUTPOWER- (referenee 1 kHz,0.3 dB) Dual Mode, 4 Ohms: 0 dBu (0

15、.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 (7.75 Vrms) INPUT IMPEDANCE (per ehannel, 20 Hz-20kHz)- Balaneed: 30kilohms Unbalanced: 15kilohms PHASE RESPONSE (at rate

16、doutputpower, any mode) - at20 Hz: +15degrees at20kHz:-15degrees THD (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, 20Hz1kHz: 0.01% Dual Mode, 8 Ohms, 1 kHz20 kHz: 0.05% BridgeMode, 16 Ohms, 20Hz1kHz: 0.01% Bridge.Mode, 16 Ohm

17、s, 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 Mode, 4 Ohms: 0.05% BridgeMode, 8 Ohms: 0.05% Dual Mode, 8 Ohms: 0.03% BridgeMode, 16 Ohms: 0.03% AlSE

18、 TIME (10%tc90%,strstedoutputpower) Dual Mode, 4 Ohms: 5IJ.sec BridgeMode, 8 Ohms:6llsec Dual Mode, 8 Ohms: 4.5Ilsec BridgeMode, 16 Ohms:20VfJJsec BridgeMode, 8 Ohms:30VflJ.sec Dual Mode, 8 Ohms:30VflJ.sec BridgeMode,16Ohms:60VflJ.sec DAMPING FACTOR - Dual Mode, 4 Ohms,20Hz-1kHz: 100 Dual Mode, 4 Oh

19、ms,20kHz: 40 Bridge Mode, 8 Ohms, 20 Hz1 kHz:200 Bridge Mode, 8 Ohms, 20 kHz: 50 Dual Mode, 8 Ohms,20Hz-1kHz: 200 Dual Mode, 8 Ohms,20kHz: 80 Bridge Mode, 16 Ohms, 20Hz-1kHz:400 Bridge Mode,16Ohms, 20 kHz: 100 CHANNEl SEPARATION - (below ratedoutputpower,singlechanneloperatlng) 80dBattkHz NOISE (bel

20、ow rated outputpower,A.welghted,any mode) _ 100dB AMPLIFIER PROTECTION - Excessiveoutput voltage Shorted loads Excessivephaseshift LOAD PROTECTION - Startup/shutdowntransientsInfrasonic signals dcfaultLowac!inevoltage COOLING - Heatslnk: Thermallyequafized3AG-inchaluminum, black anodized heatsink Du

21、al-Speed Fan:106CFM(high speed), minimumIiferatingof 20,000 hoursat72C, or 43,500 hoursat 25C ambient temperature OUTPUT TOPOlOGY - True complementary symmetry OUTPUT TYPE - Dual Mode: Unbalanced, each channel Bridge Mode: Balanced OUTPUT DEVICES - Sixteen25O-watt,250-Vf16-A,TO-3transistors CONTROlS

22、 AND SWITCHES - Inputlevelcontrolstwo),rear Modeswitch,rear Powerswitch,front FRONT-PANEL INDICATORS - PowerLED .CfipLEDs(two) !Protect LEDs(two) CONNECTIONS - Input:6-terminal barrier strip, female XLRtype connectors(two) Output: 4terminal barrier strip Power:8-foot,3-wire,17-GApower cord with NEMA

23、5-15plug POWER REQUIREMENTS - 100,120,200,220,240Vac,50/60Hz,900 watts POWER CONSUMPTION/HEAT PRODUCED - (both channeIs operating dualmodewlth 1 kHz Input signalat stated output power Imo 4 ohms,orbridge mode Into 8 ohms) Idle:130wattsf0.442kBTU/hr Y3Power:900wattsf2.380kBTUfhr Y2Power: 1060 wattsl2

24、.584 kBTU/hr Rated Power: 1430 wattsl2.822 kBTUfhr Maxlmum.Mldband Power: 960watts/1.564kBTUfhr OPERATING TEMPERATURERANGE- Upto60C (140F)ambient DIMENSIONS - Helght:13.3cm(51/4in.) Wldth: 48.2cm(19in.) Depth:32.4cm(123/4in.) COLOR -Gray/black ENCLOSURE - Rackmountchassis,16-GAsteelbottomfsides,V,G-

25、inch aluminum topfback,3AGinch6061-T6 aluminum frontpanel SHIPPING WEIGHT -21,8kg(48Ib) NET WEIGHT -17.7kg(39Ib) ( ( I . ,:-, (i. i, IEtl7300STEREOPOWERAMPLIFIER I. APUlKlCAJHLElIJ.(dBu)vsFllEQ(H.) . , . :. . .:. .,. . ., .- . . . ,. : 37.M .,.:.,. . ,- 36.M .,.i., ,. . . v . . K 1._ , ,. . . 1.- :

26、.:. 131.M . , . :. . .:. .,. ., .,. i .i. ,. 28.M . H . , ,.,. . ,. . 0 .,- .,i,.,. 25,M . .,. .;. .: i ,., . . I. ,. i. . I.G., : -. u lQ . ik18klIMik LEVELVS.FREQUENCY AP2688HtliDROOlILIUlJ.ldih)vsFllEQIHz) . .,. . . IUM ,.,.i. . i. i . . . . .,.:. ONECHANNELOPERATING . -v-i . I. IXi . .,. , ,.,.

27、-. / _. - / :. i. :-. . 1.82il . j;g ,. . iilk HEAOROOMVB.FREQUENCY FrequencyCurves LEVEL+PHASEVB.FREQUENCY =. AP261l11Atd-HoisoBAtQ)PA$SIdih)vsrllEll(H.) i .IVV.G- A-./V - . I , ,.G. . . / ;. :. i.i . / i : .8V . , .,. ,. . . .: . . . I,i :Tuk ,. . 28 iIi. ilk NO!SEVB.FREQUENCY 7300STEREOPOWERAMPLI

28、FIERInstallation LOADS Hote1,Notrlcomm.ndedrar cablerun,Ollt(100fIl30ml Nole2,Notrecomm.nded foretblerun.over IfI(2ml CH.2 Dual Mode CH.1 CH.2 - _HIGHS Compresslon Driver f-.-1+ FIGURE3 -Typical Input Connections 4.INSTALLATION 4A.Operating Cautions a.Danot operatetheamplifierina completelyc1osed, u

29、nventilated housing. b.Danot connecttheoutputs ofthechannelsinparallel. c.Danot connecttheoutputterminalstoa battery, power supply, or the power mains. Damage caused by such hookupisnot covered by the warranty. d.Becareful when making connections, selecting signal sources and controlling the outputl

30、evel. e.Danot ite the input signal groundtotheground lead ofanoutput. Ground-loop-induced oscillations may occur. f.Ensure that the main ac poweriswithin 10% of selected voltageandfrequency.Failuretooperate the unit within these limits voids the warranty. g.Use only the proper sizemainsfuseforthe se

31、lected ac voltage. h.Da not connect either side of the loudspeaker cable to ground when operating the unitinbridged mode. The bridged modeisbalancedtoground. i.Make certain that test equipmentisnot graund referenced when testing the unitinthebridged mode. j.Tampering withthecircuit er repair by unau

32、thorized personnel will void the warrantyoftheunit. slx FIGURE4 -Typical Output Connections 4B.Input Connections Two conductor shielded low-impedance cableisrecom- mended for input lines to the amplifier input.Pin2Ofthe XLRtype connectorishigh(+),pin 3islow(-),and pin 1isground.TheV4-inchjack may be

33、 usedasa low impedance input. Tipishigh(+),ringislow(-).and the sleeveisground.SeeFigure3. High impedancelinesmay be connected to the amplifier inputs with a single-conductor low capacitance sheilded cable of 30 feet orlessiniength. A two conductor1/4-inch plug will automatically unbalance the input

34、. To help avoid hum or buzzinthe output, be certain thatallinput cables frephysically separated from power wiring er power transformers. 4C.Output Connections Binding posts are provided for speaker terminations, thered postishigh (+)andtheblack postislow (-).Thepreferred connectorisa high quality du

35、al banana plug. See Figure 4 for typical output configurations. Before making output connections, the input attenuators should be turned off (full counterclockwise), doingsowill eliminate any chance of loudblastscrdamage to the loudspeaker. Power loss in the speaker wire. The impedanceofthe speaker

36、connecting wire would ideally be zero, soallof the amplifier output power would be deliveredtothe speaker load. However,theimpedance of the speaker wire can become a significant percentageofthe speaker impedance. Thus, partofthe amplifier powerislostinthe wire(inthe formofheat)andthepower delivered

37、to the speaker system IE1!1730oSTEREOPOWERAMPLIFIER Impedance AWGReslstance Size(ohms/1000 feet)4080160 101.00.120240480 121.5975150300 142.504896190 164.023060120 186.39193875 2010.1122448 2216.271530 TABlEI -Cable Selection Chart iscorrespondingly reduced. Wire impedanceishigher when using long wi

38、re runs and small wire sizes. TableI showsthetwo-wirecable(copper)lengths permissablefora number of wire sizes and speaker impedances, to avoid a loss of more than 0.5 dB.Fora loss of 1 dB (basically imperceptible) lengths maybedoubled. For a 2-dB loss, the lengths wouldbemultiplied by 4.4. Ingenera

39、l, note that the higher load impedances allow much longer smaller-gauge wiring to be used, 40.Grounding The chassisofthe unit shouldbegrounded. Connecting the chassis grounds of additional audio equipmenttothechassis ground of the amplifier may help reduce noise and hum. 4E.Ventilation Inorder to of

40、fset 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 be causedbythe envir

41、onment. 5.OPERATION 5A.Dual/Stereo Mode: In the dual or stereo mode the channels may be operated independently. Before hook-up .make sure that the mode switchisinthe dual position and that the level controls are down(FCCW).Connect the inputs and outputs (See Figures 3 and4).Turn the power amponand s

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

43、 mode switch to bridge mode and make sure both level controlsaredown(FCCW).Connect the speaker acrossthe two red binding posts. Channel 1 red postishigh(+), channel 2 red postislow (-).00not make a connection Operation toeither of the black binding posts, Switch poweronand slowly increase amplifier

44、channel 1 level control until the desired output powerisobtained,Ifthe clipLEOindicators comeon,reducethepower amp level control or the source signal level. 5C.APX Crossover Option: TheAPXcrossoverisa24dB per octave Linkwitz-Riley filter network. There are24selectable frequencies from 50 Hz to 10,00

45、0 kHz, *CAUTION* No user serviceable parts inside. Hazardous voltage andcurrentsmay be encounteredwithinthe chassis. Toavoid electric shock, donotperformany servicing unless you are qualified todoso. 50.Alternate Primary Voltage The amplifier can be powered with line v6ltages other than 120 volts by

46、 altering the primary wiring of the power transformer. Table Illiststhe primary wire color, the terminal block(TB),and the position of theTBthe wire should be locatedinfor operation at the desired voltage. To alter the transformer primary wiring configurationusethe following procedure: 1.Oisconnect

47、the amplifier from the ac power source. 2.Remove thetenscrews securing the top cover. There are three screws on each side; two screws on the rear along the bottom edge, and the two innermost screws inset into the top strip on the front panel. See Figure 5 for exact screw locations. 3.Discharge each

48、large capacitor carefully through a 150-ohm, 2-watt resistor foratleast one minute. See Figure6. 4.Locatethetwovoltage-selectionterminalblocks mounted next to each otheronthe side of the chassis between the power transformer and the large capacitor. 5.The transformer has six primary leads. Disconnect the primary leads of the power transformer by pulling each wire firmly to disengage it from th