Hafler-P7000-pwr-sm维修电路原理图.pdf

PROFESSIONAL POWER AMPLIFIERP7000Installation & OperationPROFESSIONAL POWER AMPLnovatransDESIGNED ANDASSEMBLED IN THEUSARadioFans.CN 收音机爱 好者资料库NOTICE - IMPORTANT SAFETY INFORMATIONC A U T I O NRISK OF ELECTRIC SHOCKDO NOT OPEN!WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.1.READ INSTRUCTIONSAll the safety and operating instructions of your Hafler equipmentshould be read before power is applied to the equipment.2.RETAIN OWNERS MANUALThese safety and operating instructions should be retained forfuture reference.3.HEED WARNINGSAll warnings on the equipment and in the operating instructionsare important and should be followed.4.FOLLOW INSTRUCTIONSAll operating and use instructions are important and should befollowed.5.HEATThe equipment should be kept away from areas of high tempera-ture, i.e., heater vents, radiators, stoves/ovens, fireplaces, etc.6.VENTILATIONThe equipment should be used in an area suitable for properventilation. Care should be taken not to impede airflow in andaround the cabinet.7.WATER AND MOISTUREThe equipment should not be used in or around water, such as abathtub, sink, or swimming area. Also, the equipment should notbe used in areas prone to flooding, such as a basement.8.POWER SOURCESThe equipment should be connected only to a power source ofthe same voltage and frequency as that listed on the rear panelabove the power cord entry point.9.POWER CORD PROTECTIONPower cords should be arranged so they do not interfere with themovement of objects in the room: people, fan blades, utility carts,etc. Also, care should be taken that the cord is not pinched or cut,and placed so it is not in danger of being pinched or cut, as inunder a rug, around a tight corner, etc.10. POWER CORD GROUNDINGThe power supply cord is of a three wire grounded type, designedto reduce the risk of electric shock sustained from a live cabinet.It is assumed to be of suitable length for most uses of theequipment. The use of extension cords and power strips isdiscouraged unless they are of suitable rating to deliver therequired total current for safe operation of all connected equip-ment. Furthermore, extension cords or power strips must providethe same three wire grounded connection. It is important that theblades of the equipments plug be able to fully insert into themating receptacle. Never remove the round grounding pin on theplug in an attempt to mate to a two wire ungrounded receptacle:use a grounding adaptor with the grounding tab or wire suitablyconnected to earth ground.11. NON-USE PERIODSDuring periods of extended non-use, the power cord should beunplugged from the power source.12. CLEANINGThe equipment should be cleaned only as detailed in the operat-ing instructions.13. OBJECT AND LIQUID ENTRYCare should be taken so that objects and/or liquids, such ascleaning fluids or beverages, are not spilled into the enclosure ofthe equipment.14. DAMAGE REQUIRING SERVICEHafler equipment should be serviced by qualified service person-nel when:A. The power supply cord or plug has been damaged, orB.Objects have fallen, or liquid has been spilled into theequipment, orC. The equipment has been exposed to rain, orD. The equipment does not appear to operate normally orexhibits a marked change in performance, orE.The equipment has been dropped, or the enclosure hasbeen damaged.15. SERVICINGThe user should not attempt to service the equipment beyond thatwhich is described in the operating instructions. All other serviceshould be referred to qualified service personnel.16. CARTS AND STANDSThe equipment should be used with carts or stands only ofsufficient strength and stability for the use intended.An equipment and cart combination should be moved with care.Quick stops and starts, excessive force, and uneven surfaces maycause the equipment and cart combination to topple. i The lightning flash with arrowhead symbol within an equilateral triangleis intended to alert the user to the presence of uninsulated dangerousvoltage within the products enclosure, that may be of sufficient magni-tude to constitute a risk of electric shock to persons.The exclamation point within an equilateral triangle is intended to alertthe user of the presence of important operating and maintenance (servic-ing) instructions in the literature accompanying the appliance.RadioFans.CN 收音机爱 好者资料库PE R F O R M A N C E SP EC IF IC AT ION SP7000Power Rating:FTC (20Hz-20kHz, 0.1% THD)EIA (1kHz, 0.1% THD)350 wpc into 8 375 wpc into 8500 wpc into 4* 525 wpc into 4*1000 wpc into 8*1050 wpc into 8*Continuous sine wave power limited by current rating of line fuse.Signal-to-Noise:100dB below rated output from 20Hz to 20kHzFrequency Response: 0.1dB, 20Hz to 20kHz+0/3dB, 0.2Hz to 100kHzSlew Rate:100 V/sInput Impedance:47,000 per phaseInput Sensitivity Range for rated output power:Unbalanced: 1.7V-9.5V RMS (8), 1.4V-8V RMS (4)Balanced:0.85V-4.75 RMS (8), 0.7V-4V RMS (4)Gain:+15dB min. / +30 max.CMRR:75dB at 1kHzDamping Factor:600 (to 1kHz); 200 (to 10kHz); 25 (to 100kHz)Power Consumption: 275 VA quiescent.1440 VA with both channels driven at 350 watts at 8, 1800 VA maximum.Controls & Switches: Front Panel: Power switch, Normal/Bridged mode switch, level controlsRear Panel: Chassis/Float ground switch, Stereo/Bi-amp selector switchCrossover:Variable high-pass, low-pass and bandpass; 100Hz as suppliedIndicators:Power lamp, Clip, Short, Thermal, Signal LEDsConnectors:Input:2-way XLR and 1/4 Tip Ring SleeveOutput: 5-way binding posts spaced for dual banana plugsPower:IEC 320Dimensions:19W x 1278D x 312H plus 118 for handles, includes rear supports(48.3cm x 32.7cm x 8.3cm plus 2.875cm for handles, includes rear supports)Net Weight:40 lbs. (18.18kg) ii TA B L E O F CO N T E N T SSAFETY PRECAUTIONS. iPERFORMANCE SPECIFICATIONS. iiINTRODUCTION. 1INSTALLATIONLocation . 2AC Line . 2Input. 2Input Crossover . 3Input Mode Switches . 3Output Connections . 3OPERATIONPower Switch . 4Level Controls . 4XCard Crossovers . 4Ground Switch . 5Short Circuit Protection . 5LED Indicators . 5Warm Up . 5Cleaning and Maintenance. 5TECHNICAL REFERENCEField Service Considerations. 6Theory and Operation of transnova .6PC Board Layout. 7Schematic Diagram . 8Parts List . 10P7000 Functional Block Diagram . 12Circuit Operation . 13Amplifier Module Replacement . 16Building Custom XCards. 17Resistor Chart . 18WARRANTY . 19IN T R O D U C T I O N 1 The Hafler P7000 is a two channel professional power amplifier suitable for use in any sound reinforcementsituation where faithful, accurate reproduction is required. The amplifier uses forced air fan cooling to deliverhigh power output in a compact size. Status indicators on the front panel give a visual representation ofamplifier and system operation. Input configuration switching and active crossovers enhance the flexibilitywhen used in multiple amp systems, without requiring the use of additional equipment. The use of ourpatented transnova circuit topology and MOSFET output stage ensures reliable, long term operation whichis backed by our five year warranty.This manual contains information on using the P7000 amplifiers. It is organized into three main sections.“Installation” covers the location and connection of the amplifier in the system. Like many precisioncomponents, careful attention to the initial setup can yield dividends in higher performance and trouble-freeuse. “Operation” covers the controls and features of the amplifiers and how to use them to get the best effect.The “Technical Reference” section contains field service information; in addition to the schematic and partslist there are block diagrams and circuit operation explanations useful for technicians. We strongly urgereading over the Installation and Operation portions of this manual before putting the amplifier into service.The circuitry used in the Hafler Professional power amplifiers is our transnova (TRANSconductance NOdalVoltage Amplifier, US Patent 4,467,288) circuit. The P7000 also utilizes our proprietary DIABLO (DynamicallyInvariant AB Linear Operation, patent application in progress) transconductance driver stage which combinesthe linearity of Class A operation with the current headroom of a Class B system. When combined with therobust output stage used in the P7000, DIABLO yields lower high frequency distortion without the sonicpenalties associated with increasing the negative feedback. We have been using MOSFETs in our poweramplifiers since the 1970s. During this time, they proved to be extremely fault tolerant, even in abusivesituations. This ruggedness enables the amplifier to drive reactive speaker loads without the performance andsound penalties imposed by elaborate Safe Operating Area protection schemes.Active crossovers are incorporated at the input of the amplifier. These crossovers are controlled through theuse of our XCard plug-in modules. Each XCard can operate as a full-range, high-pass or low-pass filter with a12dB per octave Butterworth alignment. Each channel utilizes two XCards which in combination can beconfigured as a 24dB per octave slope or a 12dB per octave bandpass filter. Since the XCard contains the resistorsand capacitors that establish the crossover Q and frequency; specific system requirements can easily beaccommodated just by changing the component values.Input configuration switches allow the amplifier to be configured for conventional stereo, two channel monoor single channel bridged use. When the amplifier is run in two-channel mono mode, the level controls andcrossovers for each channel are fully functional which allows for using the amplifier as a single channel in abi-amped system.Specialized circuits which prevent damage to the amplifiers and speakers have been carefully implemented toavoid affecting the audio signal. A soft start circuit prevents sending potentially destructive turn-on and turn-off transients to the speakers. A thermal sensing network monitors the heatsink temperature and shuts downthe amplifier to protect it from excessive operating heat. The need for internal fuses has been eliminated; asensing circuit monitors the output and shuts down the power when it detects a short in the output load.Each channel of the amplifier has been built as a self-contained module. This modular arrangement simplifiesconstruction and improves service accessibility. The circuit board assembly makes extensive use of surfacemount components in the low power portion of the audio circuitry. Automated equipment is used to place andsolder the components which yields greater uniformity and reliability.The front panel has controls for input level adjustment and the power switch. In addition, LED indicators givea visual representation of the operating status of each channel. The THERMAL and SHORT indicators light toshow when these protection circuits have been activated. The clip indicator helps prevent damaging thespeakers by showing when the amplifier is overdriven. The SIGNAL indicator lights to show the presence ofan audio signal.IN S T A L L A T I O NLOCATIONThe P7000 uses forced-air fan cooling to remove the heat produced in normal operation. Although this makesthe amplifier less sensitive to ventilation than if it were passively cooled, fresh air flow at the mounting locationmust still be considered. The fan pulls in fresh air through the side vents and the heated air is forced out throughthe front panel. Another consideration when choosing the location for a fan cooled amplifier is its proximityto the listening position. In some situations the sound of the fan operation can be distracting.The power transformer can generate a substantial magnetic field, so caution should be exercised in theplacement of low level components such as a tape deck, mixer or mic preamp to avoid inducing noise in thelow level circuitry. Allow several inches of clearance when mounting these components.AC LINEThe P7000 operates from a 120 volt, 60Hz AC power line. Connection is made by 14 gauge, IEC Type 320,grounded line cord. For safety considerations only a properly grounded (earthed) receptacle should be used.If a grounded circuit is not available do not break off the ground pin; use the proper adapter plug for a two wirereceptacle. The power line fuse is mounted on the rear panel of the amplifier. If this fuse blows replace it onlywith the same type and rating fuse. The correct replacement fuse value is printed on the rear of the amplifierand in the parts list.INPUTThe input jacks used on the P7000 are dual function connectors which accept 1/4 (Tip Ring Sleeve) phone andXLR plugs. The amplifier will operate with either a balanced or unbalanced signal source. The connector pin-out is printed on the rear panel of the amplifier.Balanced Input: 1/4 Tip Ring SleeveThe 1/4 balanced input jack is connected according to conventional usage with the Tip high (+), Ringreturn () and the Sleeve ground shield.Balanced Input: XLRThe XLR balanced input jack is connected according to the IEC and AES Standard, with pin 2 high (+),pin 3 return () and pin 1 ground shield. When preparing to use the amplifier, check the outputconfiguration of the source unit to maintain the proper signal polarity.Unbalanced InputMany popular mixers use unbalanced RCA phono or 1/4 phone jacks for the monitor outputs and canbe used with the P7000 for short cable runs. The specifications for the mixer should give the maximumcable length it is capable of driving. The return () terminal must be grounded when using the amplifierwith the input unbalanced to prevent unstable operation.Unbalanced Source with Balanced InputSome systems will have a noticeable amount of residual ground noise when run with unbalanced signallines. Better noise rejection can be achieved in these systems by using shielded, twisted pair (balanced)cable from the unbalanced source. At the source end of the cable, connect an RCA or 1/4 phone plugwith the return () wire and shield connected to the ground terminal of the plug. Wire the plug at theamplifier end of the cable the same as for the regular balanced input connection described above. 2 3 INPUT CROSSOVERThe XCard crossover modules are plug-in cards located inside the amplifier. The P7000 is shipped with 100HzXCards in each channel. Since each XCard can operate full range, high-pass or low-pass, with a 12dB per octaveslope, this allows the amplifier to be used in a wide range of applications. XCards are available for a variety offrequencies from your dealer or through our Customer Service department.To order additional XCards call Customer Service at 800-669-9899. Office hours are 8:00 a.m. to 5:00 p.m. MST,Monday through Friday. All orders are pre-paid and VISA and MasterCard are accepted.INPUT MODE SWITCHESTwo-Channel StereoTo run the P7000 in two-channel mode, set the front channel NORMAL/BRIDGED switch in theNORMAL position and set the rear panel STEREO/BI-AMP switch to the STEREO position. Thisconfigures the amplifier for conventional left and right stereo oper