Qsc - MXa Series Owner's Manual 电路图.pdf

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1、1 Owners Manual A U D I O *TD-000026-00* Rev. B MX 1000a MX 1500a MX 2000a MX 3000a L L L L MXa Series RadioFans.CN 收音机爱 好者资料库 2 MXa Series Power Amplifier Operation Manual T A B L E O F C O N T E N T S I.WARNING NOTICES. 3 Speaker Damage . 3 Speaker Output Shock Hazard . 3 Rack Mounting Precaution

2、. 3 II.OVERALL DESCRIPTION . 4 III.INPUTS . 5 MX 1000a. 5 MX 1500a. 5 MX 2000a. 5 MX 3000a. 5 IV.OUTPUTS . 6 Controls and Displays . 6 AC Power . 6 V.OPERATIONS . 6 Troubleshooting . 7 Specifications . 8 Open Input Architecture Level One. 9 Parallel, Stereo, or Bridged Operation . 10 Instructions fo

3、r Bridged Operation . 10 VI.LONG-TERM OUTPUT POWER . 11 AC Current Consumption . 11 Heat Emissions . 12 Protection Circuits . 12 VII.WARRANTY AND DISCLAIMERS. 13 Disclaimer . 13 Product Warranty . 13 VIII. TECHNICAL ASSISTANCE AND SERVICE. 13 Technical Assistance . 13 Factory Service . 13 Qualified

4、Service Centers . 14 International Servicing. 14 IX.QSC ONLINE. 14 X.IMPORTANT ADDRESS AND TELEPHONE INFORMATION. 15 EXPLICATION DES SYMBOLES GRAPHIQUES Le symbole clair avec point de flche lintrrieur dun triangle quilatral est utilis pour alerter lutilisateur de la presence lintrieur du coffret de

5、“voltage dangereux” non isol dampleur suffisante pour constituer un risque deltrocution. Le point dexclamation lintrieur dun triangle quilatral est employ pour alerter les utilisateurs de la prsence dinstructions importantes pour le fonctionnement et lentretien (service) dans le livret dinstruction

6、accompagnant lappareil. EXPLANATION OF GRAPHICAL SYMBOLS The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products enclosure that may be of sufficient magnitude to constitute a risk

7、of electric shock to humans. The exclamation point within an equilateral triangle is intended to alert the users to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. ERKLRUNG DER GRAPHISCHEN SYMBOLE Der Blitz nach unten zeigendem

8、 Pfeil in einem gleichseitigen Dreieck weist den Benutzer auf das Vorhandensein einer unisolierten, ”gefhrlichen Spannung“ im Gehuse hin, die stark sein kann, einer Person einen elektrischen Schlag zu versetzen. Das Ausrufzeichen in einem gleichseitigen Dreieck weist den Benutzer auf wichtige Betrie

9、bs- und Wartungs- vorschriften in den beiliegenden Unterlagen des Gertes hin. RadioFans.CN 收音机爱 好者资料库 3 I. WARNING NOTICES SPEAKER DAMAGE The MXa Series amplifiers are among the most powerful professional amplifiers available and is capable of pro- ducing much more power than many loudspeakers can h

10、andle. It is the users responsibility to use suitable speakers with the amplifier and to use them in a sensible way that will not cause damage. QSC will not be responsible for blown speakers. Consult the speaker manufacturer for power-handling recom- mendations. Either channel of the MX 3000a amplif

11、ier has special clip- limiting protection circuitry that reduces the signal level at the onset of heavy clipping. This not only allows the amplifier to operate at a high average power level without audible distortion occurring, but it also prevents the speakers being destroyed by excessive clipping.

12、 How- ever, if the amplifier is operating normally and your speakers fail anyway, it is virtually certain that they could not handle the high power, despite the lack of clipping. Even if you reduce the gain using the amplifiers front panel attenuator controls, it is still possible to reach full outp

13、ut power if the input signal level is high enough. A single high-power crescendo can blow high-frequency drivers almost instantaneously, while low-frequency driv- ers can usually withstand very high, continuous power levels for a few seconds before they fail. Reduce power immediately if you hear any

14、 speaker “bottoming out” harsh pops or cracking distortion that indicate that the speaker voice coil or diaphragm is striking the magnet assembly. QSC recommends that you use amplifiers of this power range for more headroom (cleaner sound) rather than for increased volume. SPEAKER OUTPUT SHOCK HAZAR

15、D An MXa amplifier is capable of producing hazardous output voltages. To avoid electrical shock, do not touch any exposed speaker wiring while the amplifier is operat- ing. RACK MOUNTING PRECAUTIONS In portable racks, to avoid damage to either the amplifier mounting ears or the mounting rails, suppo

16、rt the amplifier at all four corners. Contact the QSC Customer Service Department to order rear support brackets. CAUTION: To reduce the rish of electric shock, do not remove the cover. No user-serviceable parts inside. Refer servicing to qualified service personnel. WARNING: To prevent fire or elec

17、tric shock, do not expose this equipment to rain or moisture. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN ATTENTION: Pour eviter les risques de choc lectrique, ne pas enlever le courvercle. Aucun entretien de pices intrieures par lusager. Confier lentretien au personnel qualifi. AVIS: Pour eviter les

18、 risques dincendie ou dlectrocution, nexposez pas cet article la pluie ou a lhumidit. AVIS RISQUE DE CHOC LECTRIQUE NE PAS OUVRIR VORSICHT: Um das Risiko eines elektrischen Schlages zu vermindern, Abdeckung nicht entfernen! Keine Benutzer Wartungsteile im Innern. Wartung nur durch qualifiertes Wartu

19、ngspersonal. WARNUNG: Zur vermeidung von Feuer oder elektrischen Schlgen, das Gert nicht mit Regen oder Feuchtigkeit in Berhrung bringen! VORSICHT GEFAHR EINES ELEKTRISCHEN SCHLAGES. NICHT FFNEN! SAFEGUARDS Electrical energy can perform many useful functions. This unit has been engineered and manufa

20、ctured to assure your personal safety. Improper use can result in potential electrical shock or fire hazards. In order not to defeat the safeguards, observe the following instruc- tions for its installation, use and servicing. PRECAUTIONS Lnergie lectrique peut remplir de nombreuses fonctions utiles

21、. Cet appariel a t conu et ralis pour assurer une scurit personnelle entire. Une utilisation impropre peut entraner des risques dlectrocution ou dincendie. Dans le but de ne pas rendre inutiles les mesures de scurit, bien observer les instructions suivantes pour linstallation, lutilisation et lentre

22、tien de lappareil. 4 II. OVERALL DESCRIPTION The MXa Series from QSC comprises four high-effi- ciency professional power amplifier models, each with two independent channels. The MX 1000a, MX 1500a, and MX 2000a, can deliver, respectively, 275, 400, and 475 watts into 8-ohm loads, and 400, 600, and

23、725 watts into 4-ohm loads Either channel of the MX 3000a is capable of delivering 850 watts into 8-ohm loads, 1300 watts into 4-ohm loads, or more than 1600 watts into 2 ohms. Each channel has its own transformer secondary (MX 1000a and MX 1500a) or power transformer (MX 2000a and MX 3000a) and bip

24、olar multi-rail power supply. The power transformers are mounted in the front of the amplifier chassis, as close to the front mounting rails as possible; this keeps the units center of gravity forward to minimize the twisting force on the front mounting ears. Still, the amplifier should be supported

25、 at all four corners, especially if it is in a portable rack such as in touring or mobile applications. The MX 1000a and MX 1500a are both two rack spaces high and weigh 19 kg (42 lb). The MX 2000a and MX 3000a occupy three rack spaces. The MX 2000a weighs 24.5 kg (54 lb), and the MX 3000a weighs 31

26、 kg (69 lb). The amplifiers require a rack depth of 18 inches (45.7 cm) to clear the rear support ears. Allow some additional clearance for input and output connectors at the rear panel, which is 16.9 inches (42.9 cm) behind the plane of the front mounting rails. The built-in cooling fan draws air i

27、n at the rear of the chassis and exhausts it through vents in the front panel. The flow-through cooling scheme allows you to rack-mount the amplifiers one atop the other, with no clearance necessary in between. This mounting technique also helps support the weight of the upper amplifiers. The MXa Se

28、ries derives much of its design from our high- end EX Series amplifiers. They are engineered for stabil- ity and exceptional reliability, with protection for open or short circuits and mismatched loads. To protect your loudspeakers, the outputs mute during turn-on and turn- off, and also in the even

29、t of a DC fault. All protection circuitry automatically resets to normal when conditions assure safe operation. The amplifiers feature thermal protection. The MX 3000a features a variable-speed fan, which responds continu- ously to the cooling needs to minimize noise and dust build-up, and a thermal

30、 limiter that reduces gain up to 15 dB if the amplifier overheats above 80 C. The other models have a two-speed fan. If an MXa amplifier over- heats to 85 C or higher, a protection circuit mutes the output. GAIN 2 PWR 24 18 14 12 10 8 6 4 2 0 - dB SIGCLIPPROT GAIN 1 24 18 14 12 10 8 6 4 2 0 - dB PWR

31、SIGCLIPPROT Dual Monaural Amplifier ON OFF MX 2000a Professional Stereo Amplifier ON OFF GAIN 2 PWR 24 18 14 12 10 8 6 4 2 0 - dBMX 1500a SIGCLIPPROT GAIN 1 24 18 14 12 10 8 6 4 2 0 - dB PWRSIGCLIPPROT Figure 1: QSC MX 1500a Front Panel (identical to the MX 1000a) Figure 2: QSC MX 2000a Front Panel

32、(identical to the MX 3000a) 5 III. INPUTS An MXa amplifier features balanced inputs, connected via barrier strip terminals or 1/4” (6.3 mm) tip/ring/sleeve phone jacks. The tip of the input jack is wired for “nega- tive or inverted polarity, while the ring is the non-inverting input. Thus, if the vo

33、ltage at the tip is positive with respect to that at the ring, the amplifier channel will produce a negative voltage at its output. For use with unbalanced signals, connect the unused terminal to ground to avoid a reduction in gain caused by a floating input; use a two-conductor (tip/sleeve) plug, o

34、r connect a jumper between the inverting input terminals on the barrier strip and their adjacent ground terminal. MX 1000a INPUTS The amplifiers input sensitivity is 1.1 volt rms; at this signal level and input attenuators set for full gain, the amplifier will produce full rated power250 watts, 20Hz

35、- 20kHz, 0.1% THDinto an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers. MX 1500a INPUTS The amplifiers input sensitivity is 1.07 volt rms; at this signal level and any attenuators set for full gain, the amplifier will produce full rated p

36、ower350 watts, 20Hz- 20kHz, 0.1% THDinto an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers. MX 2000a INPUTS The amplifiers input sensitivity is 1.05 volt rms; at this signal level and any attenuators set for full gain, the amplifier will p

37、roduce full rated power450 watts, 20Hz- 20kHz, 0.1% THDinto an 8-ohm load. The input imped- ance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers. MX 3000a INPUTS The amplifiers input sensitivity is 1 volt rms; at this signal level and any attenuators set for full gain, the

38、amplifier will produce full rated power800 watts, 20Hz-20kHz, 0.1% THDinto an 8-ohm load. The input impedance is 20 kilohm balanced and 10 kilohm unbalanced, typical of QSC amplifiers. An MXa Series amplifier features a Level I Open Input Architecture slot. See Section 2 for more information about O

39、pen Input Architecture. BRIDGED MONO CHANNEL 2 CH 2 AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOSTURE. GND+ AUDIO CH 1INPUT CH 2 TIP NEG RING POS SLEEVE GND CH

40、1 TIP NEG RING POS SLEEVE GND STEREO PARALLELBRIDGE + + CHANNEL 1 STEREO 4 OHM MIN/CH. BRIDGED MONO 8 OHM MIN. CLASS 2 WIRING CLASS 1 WIRING MUST BE USED BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON INPUT PANEL TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY. CONNECT SPKR (+) TO CH 1 (+)

41、OUTPUT. CONNECT SPEAKER () TO CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE LEVEL WITH CH 1 GAIN CONTROL. BRIDGED MONO CHANNEL 2 CH 2 AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION WARNING:TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXP

42、OSE THIS EQUIPMENT TO RAIN OR MOSTURE. GND+ AUDIO CH 1INPUT CH 2 TIP NEG RING POS SLEEVE GND CH 1 TIP NEG RING POS SLEEVE GND STEREO PARALLELBRIDGE + + CHANNEL 1 STEREO 4 OHM MIN/CH. BRIDGED MONO 8 OHM MIN. CLASS 2 WIRING CLASS 1 WIRING MUST BE USED BRIDGED MONO OPERATION: PLACE BRIDGING SWITCH ON I

43、NPUT PANEL TO BRIDGED POSITION. CONNECT INPUT SIGNAL TO CH 1 ONLY. CONNECT SPKR (+) TO CH 1 (+) OUTPUT. CONNECT SPEAKER () TO CH 2 (+) OUTPUT. SET CH 2 GAIN FULLY CLOCKWISE AND REGULATE LEVEL WITH CH 1 GAIN CONTROL. Figure 3: QSC MX 1500a Back Panel (identical to the MX 1000a) Figure 4: QSC MX 2000a

44、 Back Panel (identical to the MX 3000a) 6 IV. OUTPUTS Four “touch-proof” binding postsone pair per chan- nelon the rear panel allow speaker cable connections to the amplifier outputs. The special design allows con- nection of large diameter speaker cable while reducing shock hazard due to the high output power of MXa amplifiers. The “hot” terminal of each output pair is the red one; the black one is signal ground. If you are operating the amplifier in “bridged” mode, connect the s