Hafler_P505_Service_Manual 电路图.pdf

THE ha fler P505 PROFESSIONAL POWER AMPLIFIER INSTALLATION AND OPERATION CAUTION: IF THE SPEAKER FUSES BLOW, SOME DISTORTED SOUND CAN BE HEARD. THEREFORE IF AMPLIFIER MALFUNCTIONS, ALWAYS CHECK FOR BLOWN FUSES FIRST. LM135 THE DAVID HAFLER COMPANY 5910 Crescent Boulevard, Pennsauken, New Jersey 08109 Hafler P505 Professional Power Amp RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS Power Rating: 400 watts per channel into 4 ohms at less than 0.04% THD from 20 Hz to 20 kHz with both channels driven. 255 watts per channel into 8 ohms at less than 0.025% THD from 20 Hz to 20 kHz with both channels driven. 800 watts into 8 ohms at less than 0.04% THD from 20 Hz to 20 kHz in monophonic bridged operation. IM Distortion (SMPTE): Less than 0.007% from 1 watt to 225 watts, each channel, into 8 ohms. Typical THD at 255 watts into 8 ohms:1 kHz:0.002% 10 kHz: 0.007% Frequency Response into 8 ohms: -3 dB, 2 Hz to 120 kHz at 1 watt. 0.5 dB, 5 Hz to 40 kHzat255watts. Typical Channel Separation at 1 kHz: 65 dB Signal to Noise Ratio: Exceeds 100 dB referred to 255 watts into 8 ohms, unweighted. Exceeds 90 dB referred to 1 watt into 8 ohms, A weighting. Input Impedance: 47,000 ohms, in parallel with 50K ohms input level control. Input Sensitivity: 2.35 volts for 255 watts into 8 ohms; 0.14 voltfor 1 watt. 2 volts for 400 watts into 4 ohms; 0.08 volt for1 watt. Damping Factor: 200 to 1 kHz into 8 ohms; 60 to 10 kHz into 8 ohms. Rise Time: 10 kHz, 80 volts p/p square wave, 10% to 90%: 2.5s. Slew Rate: 1 kHz, 120 volts p/p square wave, 40 V/S. Semiconductor Complement: 27 transistors, 12 power MOSFETs, 33 diodes, 8 zener diodes, 1 integrated circuit, 1 diode bridge. Power Consumption: 240 VA quiescent; 1200 VA rated power into 8 ohms, both channels driven. Size: 7” high plus 1/4” feet, 19” wide, 13” deep plus 1” for handles. Net Weight: 48 lbs. Shipping Weight: 52 lbs. WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. CAUTION: For continued protection, replace the power fuse only with the same type and rating as indicated. RadioFans.CN 收音机爱 好者资料库 INTRODUCTION The P505 is a high power two channel audio power amplifier designed and constructed for professional sound applications. It can deliver very high power into 4 ohm loads, simultaneously maintaining a level of performance normally associated only with state of the art amplifiers of lesser power capability. The rated continuous power output from each channel is 400 watts into 4 ohms. The short term continuous power is in excess of 500 watts per channel into 2 ohms. This is more than enough to disable most loudspeakers if improperly applied. Moreover, the conservative rating method we use, and the design factors which contribute to its excellent sound and superior low impedance drive capabilities, necessitate a word of caution about its peak power potential. Peak power outputs can be more than double continuous ratings. Each channel is capable of delivering more than 20 amps into a short circuit! And, in monophonic applications, the P500 can deliver in excess of 800 watts continuous power into 8 ohms. Such reserves of power must be treated with understanding, as the Hafler Company will not be responsible for misuse, or consequent loudspeaker damage. Distinctive features of the P505 reflect the focus of this design on the specific needs of the professional sound installer. Ease of installation and setup, through attention to the smallest detail, is coupled with overrated components, and rugged construction to deliver workhorse dependability. The choice of notably rugged design binding posts for load connection allows for a choice of wiring termination, and they are on ” centers to facilitate the use of dual banana plugs. The mono-stereo bridging switch is on the back panel, not hidden inside. A choice of input connectors is provided for. Air filters and loudspeaker fuses may be replaced quickly without having to dismount or open the amplifier. The Hafler total design approach minimizes your time and cost of installation and equipment service, and provides a high level of protection to associated equipment and operating personnel. P505 POWER AS A FUNCTION OF IMPEDANCE POWER PER CHANNEL BOTH CHANNELS DRIVEN The P505 incorporates a number of protective devices. Separate power supply fuses for B + and B - on each channel, individual thermal sensors on each heat sink, a relay to disengage the output if excessive DC offset is detected, a delay to avoid turn-on transients, and accessible output fuses on the back panel to protect the load are in addition to the AC line fuse, which must be located inside to conform to safety codes. Connections and variable controls are located on the back panel, secure from accidental manipulation. The front panel bears only the power switch with its combination pilot lamp and over temperature indicator. A major factor in the P505s superiority is the choice of power MOSFET devices as the output interface between the signal and the load. These transistors exhibit intrinsic self-regulating characteristics that serve to protect both the amplifier and the associated equipment against damage due to overheating or inadequate current limiting. The benefits over conventional circuitry are obvious - the prorectlve circuitry which is a chief cause of extraneous signals in traditional designs is eliminated, and you have greater reliability from a simpler design. The P505 retains the time-proven design parameters that have established the Hafler reputation for exceptional amplifier performance: complementary push-pull circuitry, direct coupling beyond the initial input, all silicon discrete devices, minimal use of feedback, conservative specification of all components, and a carefully distilled circuit topology. You can expect the manufactured product to consistently deliver the same high standards of power output, low distortion and low noise normally associated with laboratory prototypes. Thank you for purchasing this Hafler amplifier. Our Technical Services Department is available to answer any questions at (609) 662-6084. We are here to see that your experience with Hafler products is satisfactory and profitable in every way. 3 RadioFans.CN 收音机爱 好者资料库 Adequate ventilation is a primary consideration when installing any high power amplifier, because of its appreciable heat output. Cool air is drawn in through the foam filters on the sides, and the warm exhaust is to the rear. Make sure this flow is not impeded, and do not allow the system to work in a closed box. The filters must be kept clean - just slip them out, wash them, and squeeze dry. Replacements are available from the Hafler Company, but if you choose to obtain them locally, make sure you use open cellfoam for air conditioner filters. Amplifiers supplied for overseas use with line voltages above 200 VAC use a different fan than those intended for 100 - 120 VAC. If conversion to the other line voltage range is indicated. be sure the correct fan is obtained from the factory. See “AC Line Connections for Overseas Use.” The front panel is designed for mounting in a standard EIA 19” wide rack, using four #l10-32 screws and countersink washers. It is sufficiently rigid to support the P505 safely. The panel is slightly under the 7” height to allow clearance between adjacent units. The feet may be unscrewed from the bottom to facilitate such installation. A power transformer of this size will radiate a noticeable hum field, even though Hafler transformers are specially engineered to reduce this effect. If the amplifier is likely to be installed close to equipment which may be sensitive to such a field, such as microphone amplifiers or other high gain audio stages, be sure you have adequate separation. CONNECTIONS AC Line A 3-wire grounded power cord is provided on the P50.5. It must be connected to a properly grounded (earthed) AC receptacle for your safety. Never break off the ground pin on the plug to avoid obtaining the proper adapter for 2-wire receptacles. Do not use cords which are frayed, or whose plug is damaged. Do not disconnect by pulling on the cord. Grasp the plug itself. High power output puts heavy demands on the supply wiring. Each P505 requires 15 amperes (at 120 VAC) for proper operation. A separate 20 ampere line is recommended. If extension cables must be used, keep them short, and use #14 gauge or heavier 3-wire cord. Input The amplifier is supplied with standard 2-circuit (tip-sleeve or T-S) phone jacks for normal unbalanced input connections. These use single conductor shielded cable (shield connected to the sleeve), or you may choose two wire shielded cable. With two wire cables, and an unbalanced input, the signal, or hot (black) lead connects to the plug tip and the ground (white or red) lead connects to the sleeve. Hum is usually minimized in two wire cable by connecting the shield to the ground wire at one end only. PHONE PLUG INSULATING PLUG BODY I SLEEVE SHIELDED CABLE SHIELD MAY BE CONNECTED GROUND LUG (see TEXT) TO If very long input signal cables are required, a balanced input is usually advisable, using two wire shielded cable, and adding the Hafler BL500 option, which eliminates the need for hum-sensitive external input transformers. Then the 2-circuit (T-S) phone jacks may be replaced by 3-circuit (tip-ring-sleeve or T-R-S) jacks, wired with the low (white or red) lead to the ring, and the shield to the sleeve. Or, 3-pin Cannon XLR connectors may be installed via the chassis knockout provided. The XLR connectors are often preferred for either balanced or unbalanced lines because of a locking provision. Because there are two wiring standards, you want to make sure all your equipment is consistent.The IEC International standard connects the shield to pin # 1 and the signal (high - black wire) to pin #2. On a balanced line, the return (low - white or red wire) would go to pin #3. The defacto American standard, which is not as widely used, interchanges the connections to the #2 and #3 pins. Some applications may require the use of an input transformer, to convert balanced lines to unbalanced connections ahead of the power amplifier. Such transformers are very sensitive to magnetic fields, such as those generated by the power transformer. You may have to install them a fair distance from the P505 to avoid hum pickup. Output The red and black binding posts were chosen for heavy duty construction to handle the high currents which may be involved. They are spaced for dual banana plugs, or you can connect bare wire ends through the vertical holes in the shafts, which are visible when the cap is unscrewed. To be certain that no wire strands are unsecured, a tinned end, or a spade lug soldered to the wire is recommended. 4 filters Maintain a consistent polarity with respect to the hot and ground wires to the speakers. Most dual banana plugs have a tab identifying one side,which is customarily made the ground side. In stereo speaker installations it is important to keep consistent phase relationships to preserve low frequency response and stereo imaging perspective. This means that the same wiring sense should be followed when wiring each speaker. DUAL 6AWAMA PLUG S P A D E L U G SINGLE BANANA PLUG The black output terminals may be connected together (common ground) when accessories utilizing a common ground system, such as headphone junction boxes, are employed. However, the red terminals should never be connected together. Thus you should carefully check connections when using a common ground device, to be sure there is no reversal of the ground and high side. Connecting Cables The permissible cable length for an unbalanced input is determined by two factors: the cable capacitance per foot, and the output impedance of the signal source, which is a function of the design of the output stage of the source (control center). Cable capacitance is part of the load on the signal source. As the capacitance increases, the effect is that of a progressive filter which rolls off the high frequencies before they reach the power amplifier. The amount of the roll off increases as the output impedance goes up. With most control centers and normal input cables (under 20 feet) the filter effect will be above the audio range. If the output impedance of the source exceeds 500 ohms at 1000 Hz, a high cable capacitance may cause oscillation in the source equipment. Shortening the cable, or choosing a special low capacitance cable type may solve the problem. If very long signal cables are required, converting to a balanced input is the best solution. The Hafler BL500 balanced input option may be installed in the P505, and avoids the need for hum-sensitive input transformers. The choice of shielded wire for input cables may involve more than just the capacitance per foot. Where resistance to abuse is a factor, the rubber-clad cables with woven shielding outperform vinyl coverings. The vinyl insulation is usually supplied with a foil shield which can be easily tom, so plugs must be wired with great care. If permanent wiring involves fishing cables through conduits, the vinyl cable is easier to use because it has less surface resistance, but the foil shield is susceptible to splitting with undue stress. Some thought should also be given to selecting the output cables. When high power is demanded from the amplifier, the impedance of the output cables becomes part of the loudspeaker load. The desirably high damping factor of Hafler amplifiers, which is an index of the amplifiers ability to control the speaker, is reduced by excessive cable impedance. Even more, long runs of inadequate wiring waste power. The following chart illustrates typical power dissipation with a 4 ohm load. The lowest gauge, or heaviest practical wire size is always preferred. When very long output cables are required, the use of balanced 70 volt lines is recommended. The Hafler LX250 transformer can provide a 70.7 volt output from one channel of the P505. The rated available power per channel is the equivalent of its 8 ohm output of 255 watts. Predrilled holes in the amplifiers cover can accomodate tw o transformers. The output voltage of a P505 operated in the monophonic bridged mode is sufficient to drive a 70 volt line directly without the need for a transformer. Wire GaugePower Loss in Watts 4 ohms (A.W.G.)25 cable100 cable 61.86.9 104.417.3 1411.141.3 1826.891.2 Monophonic Operation (Bridged Mode) When very high power is desired, the P505 can be switched to a single channel amplifier, capable of delivering more than 800 watts into an 8 ohm load. For this, the Stereo-Mono slide switch is moved to Mono, and an input signal is applied to the Left input jack only. The two output leads are connected only to the Red terminals, and no connections are made to the black terminals. The output must be floating - that is, neither side can be grounded, as both are hot with respect to chassis ground. The