Crown-CE4000-pwr-sm维修电路原理图.pdf

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1、POWER AMPLIFIERSERVICE MANUAL130485-111/02Rev. B 2002 by Crown Audio, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294-8000. Trademark Notice: Amcron and Crown are registered trademarks of Crown International. Other trademarks are the property of their respective owners.CE

2、Series CE 4000Some models may be exported under the name AmcronRadioFans.CN 收音机爱 好者资料库CE 4000 Service Manual II130485-1 Rev. B2002 Crown Audio, Inc. PRVENIR LE CHOC LECTRIQUE NENLEVEZ PAS LES COUVERTURES. RIEN DES PARTIES UTILES LINTRIEUR. DBRANCHER LA BORNE AVANT DOUVRIR LA MODULE EN ARRIRE.TO PREV

3、ENT ELECTRIC SHOCK DO NOT REMOVE TOP OR BOTTOM COVERS. NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSON-NEL. DISCONNECT POWER CORD BEFORE REMOVING REAR INPUT MODULE TO ACCESS GAIN SWITCH.CAUTIONAVISWARNINGTO REDUCE THE RISK OF ELECTRICSHOCK, DO NOT EXPOSE THISEQUIPMENT T

4、O 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 cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the s

5、cope of this manual, please contact the Crown Technical Support Group.Mail: P.O. Box 1000 Elkhart IN 46515-1000Shipping: Crown Factory Service 1718 W. Mishawaka Road Elkhart IN 46517Phone: (800) 342-6939 / (574) 294-8200FAX: (574) 294-8301The lightning bolt tri-angle is used to alert the user to the

6、 risk of electric shock.The exclamation point trian-gle is used to alert the user to important operating or main-tenance instructions.RadioFans.CN 收音机爱 好者资料库 III CE 4000 Service Manual2002 Crown Audio, Inc.Revision HistoryRevision NumberDateCommentsRev. ARev. B05-200111-2002Initial PrintingAdded mis

7、sing parts list on Page 5-76. Updated area code and mailing address on Pages 1, 2 and 7. Updated sections 3.2.4, 4.3.3, 4.3.9, 4.4.5, 4.6.1, 4.6.8, 4.7.2, 4.7.3, Figure 4.16. Added notes to pages 5-39, 5-73, 5-97.130485-1 Rev. BCE 4000 Service Manual IV130485-1 Rev. B2002 Crown Audio, Inc.This page

8、intentionally left blank V130485-1 Rev. BCE 4000 Service Manual2002 Crown Audio, Inc.1 Introduction.1-1 1.1 Introduction.1-1 1.2 The CE 4000 Amplifi er.1-1 1.3 Scope.1-1 1.4 Warranty.1-12 Specifi cations.2-13 Theory of Operation .3-1 3.1 Audio Signal Path .3-1 3.1.1 Input Stage.3-1 3.1.2 Error Ampli

9、fi er.3-1 3.1.3 Modulator .3-1 3.1.4 Triangle Generator.3-2 3.1.5 Output.3-2 3.1.6 Output Filter.3-3 3.2 Protection and Control Circuitry.3-3 3.2.1 Current Monitor.3-3 3.2.2 Current Limiter.3-4 3.2.3 Display Circuitry.3-4 3.2.4 Control Circuitry.3-4 3.3 Power Supply Operation.3-5 3.3.1 Power Entry a

10、nd Filtering .3-5 3.3.2 Fuse.3-5 3.3.3 Low-Voltage Supplies (Flyback).3-5 3.3.4 Turn-On Control Circuitry.3-5 3.3.5 PFC Boost Stage.3-6 3.3.6 Bridge Isolation Stage.3-64 Maintenance.4-1 4.1 Where to Begin .4-1 4.2 Surface Mount Technology.4-1 4.3 Disassembly for Inspection & Service.4-1 4.3.1 Top Co

11、ver Removal.4-1 4.3.2 Power Supply Discharge.4-1 4.3.3 Flyback Supply PWA Removal.4-3 4.3.4 Input Module (SST) Removal.4-3 4.3.5 Output Panel Removal.4-3 4.3.6 Back Panel Assembly Removal.4-3 4.3.7 Line Filter PWA Removal .4-4 4.3.8 BFG PWA Removal.4-4 4.3.9 Main PWA Removal.4-4 4.4 Troubleshooting

12、.4-4 4.4.1 Troubleshooting Flyback Power Supply.4-4Table of ContentsCE 4000 Service Manual VI130485-1 Rev. B2002 Crown Audio, Inc. 4.4.2 Troubleshooting Trianglewave Generator and BCA Output Stage.4-5 4.4.3 Troubleshooting Power Supply, PFC PWA and Full Bridge DC to DC Converter.4-6 4.4.4 Identifyin

13、g Symptoms.4-6 4.4.5 Identifying and Repairing the Cause.4-7 4.5 Required Test Equipment.4-8 4.6 Electrical Checkout Procedures .4-9 4.6.1 Quiescent AC Power Draw.4-9 4.6.2 Gain Switches.4-9 4.6.3 Bridge Mono Operation.4-9 4.6.4 Frequency Response .4-9 4.6.5 Short Circuit Test .4-9 4.6.6 Output Powe

14、r.4-9 4.6.7 Intermodulation Distortion .4-9 4.6.8 Signal to Noise Ratio.4-9 4.6.9 Crosstalk at 20 kHz .4-10 4.6.10 Post Test Settings.4-10 4.7 Calibrations.4-10 4.7.1 Gaussian Filter Calibration.4-10 4.7.2 Overlap Correction and Adjustment.4-10 4.7.3 Current Sensing Calibration .4-11 4.7.4 Output Fi

15、lter Calibration .4-115 Parts.5-1 5.1 General Information.5-1 5.2 Ordering and Receiving Parts .5-1 5.2.1 Terms.5-1 5.2.2 Shipment .5-1 5.3 Mechanical Parts.5-1 5.3.1 CE4000 Amplifi er Assembly.5-2 5.3.2 Back Panel Assembly.5-4 5.3.3 CE4000 PS Primary Heatsink Assembly .5-5 5.3.4 CE4000 PS Diode Hea

16、tsink Assembly.5-6 5.3.5 CE4000 PS Output Heatsink Assembly.5-7 5.3.6 CE4000 Standard Input Assembly.5-8 5.3.7 CE4000 Standard Domestic Ouput Assembly.5-9 5.3.8 CE4000 Power Switch Assembly .5-10 5.4 Circuit Board Parts.5-11 5.4.1 Circuit Board and Schematic Part Numbers.5-116 Schematics.6-1Table of

17、 ContentsIntroduction 1-1130485-1 Rev. BCE 4000 Service Manual2002 Crown Audio, Inc.Crown Customer ServiceTechnical Support GroupFactory ServiceParts DepartmentMailing Address: P.O. Box 1000, Elkhart IN 46515Shipping Address: 1718 W. Mishawaka Rd., Elkhart IN 46517Phone: (574) 294-8200Toll Free: (80

18、0) 342-6939Fax: (574) 294-8301http:/1.1 IntroductionThis manual contains complete service information on the Crown CE 4000 power amplifi er. It is designed to be used in conjunction with the CE 4000 Reference Manual; however, some important information is duplicated in this Service Manual in case th

19、e CE 4000 Reference Manual is not readily available.NOTE: THE INFORMATION IN THIS MANUAL IS INTENDED FOR USE BY AN EXPERIENCED TECHNICIAN ONLY!1.2 The CE 4000 Amplifi erThe Crown CE 4000 is a compact audio amplifi er designed for professional use, providing high-power amplification from 20 Hz20 kHz

20、with minimum distortion. The CE 4000 features Crowns patented, award-winning BCA (Balanced Current Amplifi er) engineering, for superior power output, increased effi ciency, legendary Crown sound and extraordinary reliability. Crowns enhanced, switch-mode power supply with power factor correction al

21、lows the amplifier to be used worldwide without changing power supply components or settings. Other features include selectable on-board high-and low-pass fi lter sets, SST (System Solution Topologies) module compatibility, and a choice of dual output connectors: Speakon plus 5-way barrier block, 5-

22、way barrier block plus binding strip, or dual Speakon. 1.3 ScopeThis Service Manual in intended to apply to all versions of the CE 4000 amplifi er. The Parts Listings include parts specifi c for the US version and the European version. For parts specifi c only to other versions contact the Crown Tec

23、hnical Support Group for help in fi nding part numbers.1.4 WarrantyEach Reference Manual contains basic policies 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-

24、Year Full Warranty (including round trip shipping within the United States), all warranty service should be referred to the Crown Factory or Authorized Warranty Service Center. See the applicable Reference Manual for warranty details. To fi nd the location of the nearest Authorized Warranty Service

25、Center or to obtain instructions for receiving Crown Factory Service, please contact the Crown Technical Support Group (within North America), or your Crown/Amcron Importer (outside North America). If you are an Authorized Warranty Service Center and have ques-tions regarding the warranty of a produ

26、ct, please contact the Field Service Manager or the Technical Support Group. 1 IntroductionCE 4000 Service ManualIntroduction 1-2130485-1 Rev. B2002 Crown Audio, Inc.Figure 1.1 CE 4000 Front and Rear ViewsSpecifi cations 2-1130485-1 Rev. BCE 4000 Service Manual2002 Crown Audio, Inc.2 Specifi cations

27、Note: All measurements are in Stereo mode with 8-ohm loads and an input sensitivity of 26-dB gain at 1-kHz rated power unless otherwise specifi ed. PowerOutput Power: Total Harmonic Distortion (THD): 1-kHz rated power, 0.5% or less THD.Intermodulation Distortion (IMD): (60 Hz and 7 kHz at 4:1) Less

28、than 0.5% at rated power to 30 dB below rated power at 8 ohms.Damping Factor: Greater than 700 from 10 Hz to 400 Hz.*Crosstalk: Better than 50 dB below rated power, 20 Hz to 20 kHz.Common Mode Rejection (CMR): Better than 70 dB from 20 Hz to 1 kHz.DC Output Offset (Shorted Input): 10 mV.Controls & C

29、onnectorsLevel: A 31-step detented rotary level control for each channel located on the front panel.Power: An on/off rocker switch located on the front panel.Mode: Turn power off before switching. A two-position switch located on the back panel below the input connectors which, when turned to stereo

30、, operates the amplifi er as two independent channels. When “Bridge-Mono” mode is selected, the amplifier bridges the two output channels for twice the output voltage.Sensitivity: A three-position switch located on the back panel next to the Mode switch. Switchable among 0.775 volts or 1.4 volts for

31、 full output into an 8-ohm load (default setting), or 3.46 volts for a fi xed voltage gain of 26 dB.Fault Jack: A back-panel RJ-11 jack that may be remotely monitored to signal amplifi er Fault condition. An LED or other signalling device (not supplied) may be used.Filter Switches:Low Pass: A three-

32、position switch for each channel located on the back panel below the input and output modules. Switchable among settings for Flat, 80 Hz and100 Hz. Filter rolloff is 24-dB per octave.High Pass: A four-position switch for each channel located on the back panel below the input and output modules. Swit

33、chable among settings for Flat, 30 Hz, 40 Hz and 50 Hz. Filter rolloff is 18-dB per octave.IndicatorsSignal: A green LED for each channel which fl ashes when a very low-level signal (40 dBm) is present at input. May be used for troubleshooting cable runs.Clip: A red LED for each channel which turns

34、on when distortion becomes audible in the amplifi er output.* Per EN 55103-1: 1996 Annex B and Annex F. Highest reading from a sample of 10 random readings.* Measured using binding-post output connectors.1800W11200W600W3600W2400W2 ohm Dual8 ohm Bridge-Mono4 ohm Bridge-Mono8 ohm Dual4 ohm DualCE 4000

35、 Power ChartMaximum power 1 kHzwith 0.5% THDLoad Impedance: Safe with all types of loads. Rated for 2, 4 and 8 ohms in Stereo mode, 4 and 8 ohms in Bridge-Mono mode.Voltage Gain to 1-kHz, 8-ohm rated output:39.0-dB gain at 0.775-volt sensitivity;33.8-dB gain at 1.4-volt sensitivity;26-dB gain at 3.4

36、6-volt sensitivity.Required AC Mains: 50/60Hz,100-240VAC (10%). AC Line Current, 100 Volts: 8.5 A; 120 Volts: 7.1 A; 230-240 Volts: 3.7 A; At Idle: Amp draws no more than 155 watts.AC Line Connector: 15A IEC Connector with CountrySpecifi c Cord and Plug. Inrush Current*: 50.86 A.PerformanceFrequency

37、 Response: 0.25 dB from 20 Hz to 20 kHz at 1 watt (See Figure 2.1). Phase Response: 15 degrees deviation from linear phase from 20 Hz to 20 kHz at 1 watt.Signal to Noise Ratio, A-Weighted, 20 Hz to 20 kHz: Better than 100 dB below rated 1-kHz power; CE 4000 Service ManualSpecifi cations 2-2130485-1

38、Rev. B2002 Crown Audio, Inc.Figure 2.1 Typical Frequency ResponseFault: Normally off, this red indicator will blink under fi ve different conditions:1. When the amplifi er is fi rst powered up, until the unit is ready for operation.2. If the heatsinks reach a temperature above normal working limits.

39、 3. If the transformer thermal protection circuit is activated.4. If amplifi er output wires develop a short-circuit.5. If the amplifier output stage becomes non-operational.6. If there is a problem elsewhere in the amplifi er.This circuit may be monitored remotely by plugging a simple switching cir

40、cuit using an LED or other signaling device into the back-panel RJ-11 (Fault) jack. Under some conditions, the output of the amplifi er will be muted. Power: A green LED that turns on when the amplifi er has been turned on and has power. Input/OutputInput Connector (standard module): One Neutrik Com

41、bo connector for each channel which features a balanced -inch (6.35-mm) phone jack and a 3-pin female XLR connector, in parallel with a barrier strip termination. Input Stage: Input is electronically balanced and employs precision 1% resistors.Input Impedance: Nominally 20 k ohms, balanced. Nominall

42、y 10 k ohms, unbalanced.Input Sensitivity: 0.775 volts or 1.4 volts for standard 1-kHz power, or fi xed 26-dB gain.Output Connectors: Three options available: Four (4) Neutrik Speakon NL4MP (mates with NL4FC) output connectors; (2) 5-way binding posts in parallel with two (2) Speakon connectors; or

43、barrier strip outputs in parallel with two (2) 5-way binding posts.Output Signal, Stereo: Unbalanced, two-channel; Bridge-Mono:Balanced, single-channel. Channel 1 controls are active; Channel 2 should be turned down.Wiring Confi guration: (see Figure: 2.2).ProtectionCE 4000 amplifi ers are protected

44、 against shorted, open or mismatched loads; overloaded power supplies; excessive temperature, chain destruction phenomena, input overload damage and high-frequency blowups. They also protect loudspeakers from input/output DC, large or dangerous DC offsets and turn-on/turn-off transients.Construction

45、Rugged steel chassis is formed into a durable package any stagehand could love. Coated with environmentally friendly powder for long life and ease of maintenance.Cooling: Three-speed proportional speed fan.Dimensions: EIA Standard 19-inch rack mount width (EIA RS-310-B), 5.25-inch (13.34-cm) height

46、and 16.25-inch (36.56-cm) depth with additional 1-inch rear rack ears.Weight: The CE 4000 net weight is 33.3 pounds (15.1 kg). Shipping weight is 39.3 pounds. Figure 2.2 Output Pin AssignmentsTheory of Operation 3-1130485-1 Rev. BCE 4000 Service Manual2002 Crown Audio, Inc.3 Theory of OperationWARNI

47、NG: All voltages on the primary side of the flyback or bridge isolation transformers are not referenced to ground. They are referenced to the mains. When measuring these voltages with mains voltage applied, always use an isolation transformer to provide the mains voltage (and tie SMPSREF to signal g

48、round) or use an isolated differential probe.3.1 Audio Signal PathFor the sake of simplicity, only channel one of the audio signal path is described.3.1.1 Input StageSignal is presented to the CE4000 through one of three connectors when using the standard input module. Each channel is outfi tted wit

49、h a balanced XLR / phone jack, and a barrier strip. These connectors are wired in parallel, which allows daisy chaining when needed. The incoming shield is tied to ground through an 82-Ohm resistor (R607) in parallel with a 0.1uF cap (C605) for the purpose of inhibiting ground loop circulating curre

50、nts and RFI protection. The signal is then converted from balanced to unbalanced in the Balanced Input Stage where it receives further RFI protection. Input impedance is 20k Ohm balanced and 10k Ohm unbalanced. Signal then fl ows into the Variable Gain Stage where the front panel level controls are