Crown_Macro-Tech_2402_Service_Manual电路图.pdf

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1、POWER AMPLIFIER SERVICE MANUAL 130445-1 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: PIP, Grounded Bridge and SmartAmp are trademarks and Amcron, Crown, Macro-Tech, IOC, ODEP, and IQ System are

2、 registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners. Models: MA-2402 Some models may be exported under the name Amcron RadioFans.CN 收音机爱 好者资料库 MA-2402 Service Manual II 130445-1 Rev. A 2000 Crown International, Inc. PRVENIR LE CHOC LECTRIQ

3、UE 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 BEFORE REMOV

4、ING 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 does it cov

5、er 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 Elkhart I

6、N 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 130445-1 Re

7、v. AMA-2402 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-2402 Service Manual IV 130445-1 Rev. A 2000 Crown International, Inc. This page intentionally left blank V 130445-1 Rev. AMA-2402 Service Ma

8、nual 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 Features .4-1 4.3 Front End Operation.4

9、-1 4.3.1 Balanced Gain Stage (BGS) .4-1 4.3.2 Variable Gain Stage (VGS).4-1 4.3.3 Error Amp .4-1 4.4 Voltage Amplification .4-2 4.4.1 Voltage Translators .4-2 4.4.2 Last Voltage Amplifiers (LVAs).4-2 4.5 Grounded Bridge Topology .4-2 4.5.1 High Side (HS) .4-2 4.5.2 Low Side (LS) .4-3 4.6 Output Devi

10、ce Emulation Protection (ODEP) .4-4 5 Maintenance. 5-1 5.1 Cautions and Warnings.5-1 5.2 General Information .5-1 5.3 Test Procedures.5-1 5.3.1 Turn On Delay .5-1 5.3.2 Output Bias Adjustment .5-1 5.3.3 ODEP Voltage Adjustment .5-1 5.3.4 DC Offset.5-2 5.3.5 Quiescent Power Draw.5-2 5.3.6 Voltage Gai

11、n.5-2 5.3.7 Current Limit.5-2 5.3.8 10 kHz Square Wave Response .5-3 5.3.9 Crosstalk .5-3 5.3.10 Output Power .5-3 5.3.11 ODEP Limiting .5-3 5.3.12 Fan Operation .5-4 5.3.13 LF Protection .5-4 5.3.14 Signal to Noise .5-4 MA-2402 Service Manual VI 130445-1 Rev. A 2000 Crown International, Inc. 5.3.15

12、 Intermodulation Distortion (IMD) .5-4 5.3.16 Displays.5-4 5.3.17 Post Testing.5-4 6 Parts . 6-1 6.1 General Information .6-1 6.2 Ordering and Receiving 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 Schema

13、tics . 10-1 Table of Contents Introduction 1-1 130445-1 Rev. AMA-2402 Service Manual 2000 Crown International, Inc. 1.1 Introduction This manual contains complete service information on the Crown MA-2402 power amplifier. It is designed to be used in conjunction with the Reference Manual; however, so

14、me important information is duplicated in this Service Manual in case the Reference Manual is not readily available. NOTE: THE INFORMATION IN 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 am- plifi

15、ers designed for pro sound reinforcement. Macro- Tech amplifiers are designed to provide enormous levels of pure, undistorted power in a rugged low-pro- file package, utilizing Crowns patented Grounded Bridge output topology. They also employ Crowns patented ODEP protection circuitry, which keeps th

16、e amplifier working under extreme conditions that would shut down a lesser amplifier. Crowns new Macro-Tech “02” series amplifiers feature Crowns enhanced PIP2 (Programmable Input Processor) expansion system. The PIP2 expansion system makes it easy to tailor the amplifier to a specific application.

17、Providing high power amplification from 20 Hz to 20 kHz with minimum distortion, Macro-Tech series amplifiers fea- ture balanced inputs with bridged and parallel mono- phonic capability. Specific features vary depending on model. 1.3 Scope This Service Manual in intended to apply to all ver- sions o

18、f the MA-2402 amplifier. The Parts Listings in- clude parts specific for the US version and the Euro- pean version (E13CE). 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 contains basic policies

19、 as related 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 service should be re

20、ferred 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 Crown Technical Supp

21、ort 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 Tech- nical Support Group. Crown Customer Service Technica

22、l 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-2402 Service Manual 1-2 Introduction 130445-

23、1 Rev. A 2000 Crown International, Inc. Figure 1.1 MA-2402 Front and Rear Views Specifications 2-1 130445-1 Rev. AMA-2402 Service Manual 2000 Crown International, Inc. 6 Specifications Note: Specifications relate to 120-volt,60-Hz units in Stereo mode with 8-ohm loads and an input sensitivity of 26-

24、dB gain at 1-kHz rated power 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 16 ohms in Stereo, 4 to 16 ohms in Bridge-Mono an

25、d 1 to 4 ohms in Parallel-Mono mode. Voltage Gain to 1-kHz, 8-ohm rated output; 83:1 12% or 38 dB 0.5 dB at 0.775-volt sensitivity; 46:1 12% or 33 dB 0.5 dB at 1.4-volt sensitivity. 20:1 3% or 26 dB 0.25 dB at 3.1-volt sensitivity at the maximum level setting. Required AC Mains: 50/60 Hz; 100-, 120-

26、, 220- and 240-VAC (10%) units are available. All draw 100 watts or less at idle. Current, voltage and frequency requirements are provided on the units back-panel. AC Line Connector: NEMA 5-20P (20A). Performance Frequency Response: 0.1 dB from 20 Hz to 20 kHz at 1 watt (see Figure 2.5). Phase Respo

27、nse: 10 degrees from 10 Hz to 20 kHz at 1 watt (see Figure 2.3). Signal-to-Noise Ratio, A-weighted: Better than 105 dB below rated full bandwidth power. 20 Hz to 20 kHz: Better than 100 dB below full bandwidth power. Total Harmonic Distortion (THD): full bandwidth power, Less than 0.05% from 20 Hz t

28、o 1 kHz increasing linearly to 0.1% at 20 kHz. Intermodulation Distortion (IMD): (60 Hz and 7 kHz at 4:1) Less than 0.05% from 163 milliwatts to full bandwidth power. Damping Factor: Greater than 1,000 from 10 Hz to 400 Hz (see Figure 2.6). Crosstalk: See Figure 2.4. Slew Rate: (Slew rates are limit

29、ed to useful levels for ultrasonic/RF protection). Greater than 13 volts per microsecond. Controls Enable: A front-panel push button used to turn the amplifier on and off. Level: A front-panel 31-detent rotary control for each channel used to control the output level. Stereo/Mono: A three-position b

30、ack-panel switch used to select Stereo, Bridge-Mono or Parallel-Mono mode. Sensitivity: A three-position switch inside the PIP compartment used to select the input sensitivity for both channels: 0.775 volts or 1.4 volts for standard 1-kHz power, or a 26 dB voltage gain. Reset: A back-panel push butt

31、on for each channel used to reset the circuit breaker that protects each power supply. Indicators Enable: An amber front-panel indicator that shows the on/off status of the low-voltage power supply. Signal/IOC: A green front-panel indicator for each channel that flashes to show amplifier output. If

32、a channels output waveform differs from its input by 0.05% or more, the indicator flashes brightly to show distortion. This function provides proof of distortion-free performance. In Parallel-Mono mode, the Channel 2 light stays on. ODEP: An amber front-panel indicator for each channel that shows th

33、ermal-dynamic energy 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. An ODEP indicator may also turn off under other conditions. Input/Output Input Connector: Two b

34、alanced -inch(6.35-mm) phone jacks and two balanced three-pin female XLR connectors on the factory- installed PIP2-FXQ. Input Impedance: Nominally 20 k ohms, balanced. Nominally 10 k ohms, unbalanced. Maximum Input Level: 9 Vrms. Input Sensitivity: 0.775 volts for standard 1 kHz power, 1.4 volts for

35、 standard 1 kHz power, or a 26 dB voltage gain. Output Connectors: Two sets of color-coded 5-way binding posts (for banana plugs, spade lugs or bare wire). Output Impedance: Less than 10 milliohms in series with less than 2 microhenries (see Figure 2.7). DC Output Offset: (Shorted input) 10 millivol

36、ts. Output Signal Stereo: Unbalanced, two-channel. Bridge-Mono: Balanced, single-channel. Channel 1 controls are active; Channel 2 should not be used. Parallel-Mono: Unbalanced, single-channel. Channel 1 controls are active; Channel 2 controls are bypassed. Protection Macro-Tech amplifiers are prote

37、cted against shorted, open or mismatched loads; overloaded power supplies; excessive tempera- ture; chain destruction phenomena; input overload damage; and high-frequency blowups. They also protect loudspeakers from input/output DC and turn-on/turn-off transients. If unreasonable operating condition

38、s occur, the patented ODEP circuitry will proportionally limit the drive level to protect the output 2-ohm Dual (per ch.) 1 kHz Power 1,050W 800W 520W 2,070W 1,585W 850W 750W 505W 1,670W 1,485W8-ohm Bridge-Mono 4-ohm Bridge-Mono 8-ohm Dual (per ch.) 4-ohm Dual (per ch.) *1 kHz Power: refers to maxim

39、um average power in watts at 1 kHz with 0.1% THD. *20 Hz 20 kHz Power: refers to maximum average power in watts from 20 Hz to 20 kHz with 0.1% THD. MA-2402 *20 Hz 20 kHz Power * 2 Specifications MA-2402 Service Manual 2-2 Specifications 130445-1 Rev. A 2000 Crown International, Inc. Figure 2.1 Dimensions transistor stages, p