Crown_Macro-Tech_5002VZ_Service_Manual电路图.pdf

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1、POWER AMPLIFIER SERVICE MANUAL 130446-1 02-00 Rev. A Macro-Tech 2000 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Trademark Notice: Grounded Bridge, PIP2 and SmartAmp are trademarks and Amcron, Crown, IOC, IQ System, Macro-Tech, ODEP and VZ

2、 are registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners. Models: MA-5002VZ Some models may be exported under the name Amcron RadioFans.CN 收音机爱 好者资料库 MA-5002VZ Service Manual II 130446-1 Rev. A 2000 Crown International, Inc. PRVENIR LE CHOC

3、 LECTRIQUE NENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES LINTRIEUR. DBRANCHER LA BORNE AVANT DOUVRIR LA MODULE EN ARRIRE. TO PREVENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. DISCONNECT POWER CORD BEFO

4、RE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH. CAUTIONAVIS WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE! The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor doe

5、s it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact the Crown Technical Support Group. Mail: P.O. Box 1000 Elkhart IN 46515-1000 Shipping: Plant 2 SW 1718 W. Mishawaka Road E

6、lkhart IN 46517 Phone: (800) 342-6939 / (219) 294-8200 FAX: (219) 294-8301 The lightning bolt triangle is used to alert the user to the risk of electric shock. The exclamation point triangle is used to alert the user to important operating or maintenance instructions. RadioFans.CN 收音机爱 好者资料库 III 130

7、446-1 Rev. A MA-5002VZ Service Manual 2000 Crown International, Inc. Revision History Revision NumberDateComments Rev. A02-2000Initial Printing RadioFans.CN 收音机爱 好者资料库 MA-5002VZ Service Manual IV 130446-1 Rev. A 2000 Crown International, Inc. This page intentionally left blank V 130446-1 Rev. A MA-5

8、002VZ Service Manual 2000 Crown International, Inc. Table of Contents 1 Introduction . 1-1 1.1 Introduction .1-1 1.2 The MA “02” Series Amplifiers .1-1 1.3 Scope.1-1 1.4 Warranty.1-1 2 Specifications . 2-1 3 Voltage Conversion. 3-1 4 Circuit Theory . 4-1 4.1 Overview .4-1 4.2 Grounded Bridge Theory

9、.4-1 4.2.1 Grounded Bridge Operation .4-2 4.2.2 Output Stage Circuitry.4-3 4.3 VZ Power Supply.4-4 4.3.1 VZ Supply Operation.4-4 4.3.2 VZ Supply Circuitry .4-5 4.4 ODEP Theory .4-6 4.4.1 ODEP Operation.4-6 4.4.2 ODEP Circuitry .4-7 4.5 Front End Theory.4-8 4.5.1 Balanced Gain Stage .4-8 4.5.2 Variab

10、le Gain Stage .4-8 4.5.3 Error Amp .4-8 4.5.4 Compessor.4-9 4.5.5 Loudspeaker Offset Integration .4-9 4.5.6 Voltage Translator and LVA Stages .4-9 4.5.7 Inverting Stages .4-9 4.6 Protection Systems .4-9 4.6.1 Soft Start.4-9 4.6.2 Over-voltage.4-11 4.6.3 DC/LF .4-11 4.6.4 Commom Mode Output Current.4

11、-12 4.6.5 Output Thermal .4-12 4.6.6 Transformer Thermal .4-12 4.6.7 FET Thermal .4-12 4.6.8 Power Loss.4-13 4.6.9 Fan Control.4-13 4.7 Display .4-13 4.8 Mono Modes .4-13 4.8.1 Bridge Mono.4-13 4.8.2 Parallel Mono.4-14 MA-5002VZ Service Manual VI 130446-1 Rev. A 2000 Crown International, Inc. 5 Main

12、tenance. 5-1 5.1 Cautions and Warnings.5-1 5.2 General Information .5-1 5.3 Troubleshooting .5-1 5.3.1 Pre-AC-Checks .5-1 5.3.2 LED Checks .5-2 5.4 Test Procedures.5-4 5.4.1 Standard Initial Conditions .5-4 5.4.2 Equipment Required .5-4 6 Parts . 6-1 6.1 General Information .6-1 6.2 Ordering and Rec

13、eiving Parts .6-1 6.2.1 Terms .6-1 6.2.2 Shipment .6-1 7 Exploded View Parts . 7 -1 8 Module and Schematic Information. 8 -1 9 Module Parts. 9-1 10 Schematics . 10-1 Table of Contents Introduction 1-1 130446-1 Rev. A MA-5002VZ Service Manual 2000 Crown International, Inc. 1.1 Introduction This manua

14、l contains complete service information on the Crown MA-5002VZ power amplifier. It is designed to be used in conjunction with the Reference Manual; however, some important information is duplicated in this Service Manual in case the Reference Manual is not readily available. NOTE: THE INFORMATION IN

15、 THIS MANUAL IS INTENDED FOR USE BY AN EXPERIENCED TECH- NICIAN ONLY! 1.2 The MA “02” Series Amplifiers The Macro-Tech series is a complete family of ampli- fiers designed for pro sound reinforcement. Macro- Tech amplifiers are designed to provide enormous lev- els of pure, undistorted power in a ru

16、gged low-profile package, utilizing Crowns patented Grounded Bridge output topology. They also employ Crowns patented ODEP protection circuitry, which keeps the amplifier working under extreme conditions that would shut down a lesser amplifier. Crowns new Macro-Tech “02” series amplifiers feature Cr

17、owns enhanced PIP2 (Programmable Input Processor) expansion system. The PIP2 expansion system makes it easy to tailor the amplifier to a specific application. Providing high power amplification from 20 Hz to 20 kHz with minimum distortion, Macro-Tech series amplifiers fea- ture balanced inputs with

18、bridged and parallel mono- phonic capability. The MA-5002VZ includes additional features not found on other Macro-Tech series models including switchable compression, switchable loud- speaker offset integration (LOI), and ILOAD/ILIMIT indi- cation. 1.3 Scope This Service Manual in intended to apply

19、to all ver- sions of the MA-5002VZ amplifier. The Parts Listings include parts specific for the US version and the Euro- pean version (E13). For parts specific only to other versions contact the Crown Technical Support Group for help in finding part numbers. 1.4 Warranty Each Reference Manual contai

20、ns basic policies as re- lated to the customer. In addition, it should be stated that this service documentation is meant to be used only by properly trained personnel. Because most Crown products carry a 3-Year Full Warranty (includ- ing round trip shipping within the United States), all warranty s

21、ervice should be referred to the Crown Fac- tory or Authorized Warranty Service Center. See the applicable Reference Manual for warranty details. To find the location of the nearest Authorized Warranty Service Center or to obtain instructions for receiving Crown Factory Service, please contact the C

22、rown Tech- nical Support Group (within North America), or your Crown/Amcron Importer (outside North America). If you are an Authorized Warranty Service Center and have questions regarding the warranty of a product, please contact the Field Service Manager or the Technical Support Group. Crown Custom

23、er Service Technical Support Group Factory Service Parts Department Mailing Address: P.O. Box 1000, Elkhart IN 46515 Shipping Address: Plant 2 S. W. 1718 W. Mishawaka Rd., Elkhart IN 46517 Phone: (219) 294-8200 Toll Free: (800) 342-6939 Fax: (219) 294-8301 1 Introduction MA-5002VZ Service Manual 1-2

24、 Introduction 130446-1 Rev. A 2000 Crown International, Inc. Figure 1.1 MA-5002VZ Front and Rear Views Specifications 2-1 130446-1 Rev. A MA-5002VZ Service Manual 2000 Crown International, Inc. Specifications The following applies to 120-VAC, 60-Hz units in Stereo mode with 8-ohm loads and an input

25、sensitivity of 26-dB gain unless otherwise specified. Specifications for units supplied outside the U.S.A. may vary slightly at different AC voltages and frequencies. Power Output Power Load Impedance: Safe with all types of loads. Rated for 2 to 8 ohms in Stereo, 4 to 16 ohms in Bridge-Mono and 1 t

26、o 4 ohms in Parallel-Mono mode. Voltage Gain to 1-kHz, 8-ohm rated output: 132:1 12% or 42 dB 1 dB gain at 0.775 volt sensitivity; 71:1 12% or 37 dB 1 dB gain at 1.4-volt sensitivity; 20:1 3% or 26 dB 0.25 dB gain at the maximum level setting. Required AC Mains: 50 or 60 Hz; 100-, 120-, 200-, 208-,

27、230-, 240- VAC (10%). AC Line Current, Current, voltage and frequency requirements are provided on the units back panel. At Idle: All units draw 90 watts or less. AC Line Connector: 10 AWG cordset with NEMA TT30P plug is provided on 120-VAC, 60-Hz North American units. Performance Frequency Response

28、: 0.1 dB from 20 Hz to 20 kHz at 1 watt (see Figure 2.3). Phase Response: 10 degrees from 10 Hz to 20 kHz at 1 watt (see Figure 2.2). Signal-to-Noise Ratio,A-weighted: Better than 105 dB below rated 1-kHz power. Total Harmonic Distortion (THD): 1-kHz rated power, 0.05% or less true THD. Intermodulat

29、ion Distortion (IMD): (60 Hz and 7 kHz at 4:1) Less than 0.05% from rated power to 35 dB below rated power at 8 ohms. Damping Factor: Greater than 1,000 from 10 Hz to 400 Hz (see Figure 2.4). Controlled Slew Rate: (Slew rates are limited to useful levels for ultrasonic/RF protection.) Greater than 3

30、0 volts per microsecond. Controls Compressor: A three-position back-panel switch is used to control each channels input compressor. The “fast” setting provides an attack time of 4 milliseconds and a release time of 300 millisec- onds; the “slow” setting provides an attack time of 12 milliseconds and

31、 a release time of 600 milliseconds; the “off” setting defeats output-driven compression. Enable: A front-panel push button used to turn the amplifier on and off. Input Ground Lift: A two-position back-panel switch located on the PIP2-FXQ used to isolate the input audio signal grounds from the AC (c

32、hassis) ground. Level: A front-panel rotary potentiometer for each channel with 31 detents used to control the output level. Loudspeaker Offset Integration: A two-position back-panel switch for each channel used to turn the loudspeaker protection circuitry on and off. The circuitry protects against

33、DC, off-center woofer cone movement, and unwanted subsonic and ultrasonic frequen- cies. Sensitivity: A three-position back-panel switch for each channel used to select input sensitivity: 0.775 volts or 1.4 volts for standard 1-kHz power, or a 26 dB voltage gain. Stereo/Mono: A three-position back-p

34、anel switch used to select Stereo, Bridge-Mono or Parallel-Mono mode. VZ Mode: A four-position switch for each channel inside the front- panel used to control the switching mode of the VZ power supplies. Indicators Enable: An amber front-panel LED that shows the on/off status of the low-voltage powe

35、r supply. Signal/IOC: A green front-panel LED for each channel that flashes to show amplifier output. If a channels output waveform differs from its input by 0.05% or more, the indicator flashes brightly to show distortion. ODEP: An amber front-panel LED for each channel that shows thermal-dynamic e

36、nergy reserve. Normally, each ODEP indicator is lit to show available reserve energy. In the rare event that a channel has no reserve, its indicator will dim in proportion to ODEP limiting. ILoad/ILimit: A two-color (green/red) LED for each channel that shows load current and limit current. They glo

37、w green to indicate load current flowing out the amplifier, and they turn red when maximum current is being delivered to the load. Input/Output Input Connectors: Balanced three-pin XLR and balanced -inch (6.35-mm) TRS connectors are provided on the factory-installed PIP2-FXQ module. Input Impedance: Greater than 10 ohms, balanced. Greater than 5 ohms, unbalanced. Input Sensitivity: Settings incl