ElectroVoice-P3000-pwr-sm维修电路原理图.pdf
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1、 P3000 PRECISION SERIESSERVICE MANUAL RadioFans.CN 收音机爱 好者资料库The lightning flash with arrowhead symbol, within an equi-lateral triangle is intended to alert the user to the presenceof uninsulated “dangerous voltage” within the productsenclosure that may be of sufficient magnitude to constitutea risk
2、 of electric shock to persons.The exclamation point within an equilateral triangle isintended to alert the user to the presence of importantoperating and maintance (servicing) instructions in theliterature accompanying the appliance.IMPORTANT SAFETY INSTRUCTIONS1. Read these instructions.2. Keep the
3、se instructions. 3. Heed all warnings.4.Follow all instructions.5. Do not use this apparatus near water.6.Clean only with a damp cloth.7. Do not block any of the ventilation openings. Install in accordance with the manufactures instructions.8.Do not install near any heat sources such as radiators, h
4、eat registers, stoves, or other apparatus that produce heat.9.Only use attachments/accessories specified by the manufacturer.10. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has beendamaged in any way, such as power-supply cord or plug is damaged, liqu
5、id has been spilled or objects have falleninto the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.For US and CANADA only:Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a third ground
6、ing prong.The wide blade or the third prong are provided for your safety. When the provided plug does not fit into your outlet, consult anelectrican for replacement of the absolete outlet.1. Security regulations as stated in the EN 60065 (VDE 0860 / IEC 65) and the CSA E65 - 94 have to be obeyed whe
7、n servicing the appliance.2. Use of a mains separator transformer is mandatory during maintenance while the appliance is opened, needs to be operated and is connected to the mains3. Switch off the power before retrofitting any extensions, changing the mains voltage or the output voltage.4. The minim
8、um distance between parts carrying mains voltage and any accessible metal piece (metal enclosure),respectively between the mains poles has to be 3 mm and needs to be minded at all times.The minimum distance between parts carrying mains voltage and any switches or breakers that are not connected to t
9、he mains (secondary parts) has to be 6 mm and needs to be minded at all times.5. Replacing special components that are marked in the circuit diagram using the security symbol (Note) is only permissiblewhen using original parts.6. Altering the circuitry without prior consent or advice is not legitima
10、te.7. Any work security regulations that are applicable at the location where the appliance is being serviced have to be strictlyobeyed. This applies also to any regulations about the work place itself.8. All instructions concerning the handling of MOS - circuits have to be observed.Note: SAFETY COM
11、PONENT (HAS TO BE REPLACED WITH ORIGINAL PART ONLY)IMPORTANT SERVICE INSTRUCTIONSCAUTION: These servicing instructions are for use by qualified personnel only. To reduce therisk of electric shock, do not perform any servicing other than that contained in the Operating Instructions unless you are qua
12、lified to do so. Refer all servicing to qualified service personnel.1-2RadioFans.CN 收音机爱 好者资料库TECHNICAL SPECIFICATIONS at rated output power 8ohms, one channeldriven, unless otherwise specified Output Power (20Hz - 20kHz /THD 0,1%)into8 Ohms 2 x 750 Winto 4 Ohms 2 x 1200 Winto 8 Ohms bridged 1 x 240
13、0 WOutput Power (1kHz / THD = 1,0%) into 8 Ohms 2 x 850 Winto 4 Ohms 2 x 1300 Winto 8 Ohms bridged 1 x 2800 WTechnical Specification Frequency Response 10 Hz - 30 kHz /1dB Max. Output Level 91V / RMS before Cliping, reference 1 KHz / THD =1%Voltage Gain 26 dB (constant gain option)reference 1kHzInpu
14、t Sensitivity 0 dBu/0.775 Vat rated output power 6 dBu/1.55 Vreference 1 kHzMaximum Input Level 21 dBu / 9 VInput Impedance 20 kOhmactive balancedTHD 0.05% at rated output power MBW = 80 kHz, f = 1kHzIMD - SMPTE 0.01%60 Hz, 7 kHz, typicalIMD - SMPTE 105 dBA-weighted, RMS to rated output level, Input
15、 sensitivity + 6dBuCrosstalk 300internal, 1kHzDIM 30 0.01%DIM 100 40 V / msPower Consumption 1650 VA1/8 rated output power 4 OhmDimensions (WxHxD) 483x132.5 x 426mm19 x 5.2 x 16.77 (in)Weight 29 kg (63.9 Ibs)Optional Input Transformer 90176DESCRIPTIONEV power amplifiers of the PRECISION SERIES meet
16、the stringent requirements oftough touring applications. They are protec-ted against over-temperature, overload,shorted outputs, radio frequency interferenceand DC faults. The power transistors areprotected from damage from reverse feedingof electrical energy by means of an additionalspecial protect
17、ive circuit. For the so-calledsoft-start, the power outputs are switched ondelayed via relays. An inrush current limitercircuit prevents the mains fuses from beingblown. Maximum precision is also guaranteed asregards mechanical construction and finish.The robust steel chassis features remarkab-le to
18、rsion resistance and is specially de-signed to cope with the tough wear and tearassociated with going on tour. Thermalstability is guaranteed by several low noise3-stage fans which also means that they canbe used inside the studio.Comparator cir-cuits constantly compare the power ampli-fiers input a
19、nd output signal and control thelimiters under non-linear operating conditi-ons. They protect the loudspeakers fromoverload due to power stage clipping. ThePRECISION SERIES power amplifiers fea-ture excellent transmission properties. Thepower amplifier topology also makes forextremely low distortion
20、 rates. Distortion fac-tor (THD), intermodulation distortion(SMPTE-IM) and transient intermodulationdistortion (DIM 30 and DIM 100) are so lowthat they are only detectable with the mostsophisticated measuring equipment. Gene-rously dimensioned power supplies with low-leakage toroidal-core transforme
21、rs provideconsiderable headroom well above the no-minal ratings. V/I foldback limiter circuitswere deliberately not included in the PRE-CISION SERIES power amplifiers to facilita-te operation at complex loads up to a phaseangle of +/- 90.The inputs are electronicallybalanced on XLR connectors. (Isol
22、ationtransformers can be retrofitted). Direct Outsin the form of XLR connectors (male), to loopthe signal through, are also standard featu-res. Architects and engineers specificationsP 3000STEREO POWER AMPLIFIERPRECISION SERIESThe modes DUAL/Stereo or PARAL-LEL/Mono can be selected via the InputRout
23、ing Switch. Furthermore, the PRECISI-ON SERIES power amplifiers can also beoperated in “Mono Bridged” mode. The frontpanel accommodates the dB-calibrated inputGain controls which are designed as espe-cially precise and safe-to-operate detentedpotentiometers. The LED display providesinformation about
24、 the power amplifers ope-rating status. For the two channels, theydemonstrate readiness to operate, whetherthere is a signal at the input or output, whenthe Limiters have been activated and whetherone of the protective features has beentriggered. The power outputs Channel A,Channel B and Bridged Out
25、 are available onSpeakon connectors. The rear side of the unitaccommodates the ON/OFF switches for theintegrated Hi and Lo cut filters, a groundliftswitch which separates the housing from thecircuit ground thus helping to prevent humloops and the operating modes selector tomono bridged operation. Th
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