Crown-M120-pwr-sm维修电路原理图.pdf

Service Manual 130352-1 10/02 Rev. D C IECE SERSCE SERIESCE SERIESCE SERIES P O EL U I AE SS IN M L FPROFESSIONAL AUDIO AMPLIFIERS Models: CE-1000, CE-2000 (some units may have the model names: CE-1000A, CE-2000A, CE-2000TX, UT-1010, UT-2020, M120, M240, S2, and S3) 2002 by Crown Audio, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 574-294- 8000. CE Series amplifiers are produced by Crown International, Inc. Trademark Notice: Crown and MultiMode are registered trademarks of Crown International. Other trademarks are the property of their respective owners. RadioFans.CN 收音机爱 好者资料库 CE Series Service ManualRev. D 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 scope of this manual, please contact the Crown Technical Support Group. Mail: P.O. Box 1000 Elkhart IN 46515-1000 Shipping: 1718 W. Mishawaka Rd., Elkhart IN 46517 Phone: (800) 342-6939/(574) 294-8200 FAX: (574) 294-8301 Web: PRVENIR LE CHOC 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 BEFORE 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! I RadioFans.CN 收音机爱 好者资料库 CE Series Service ManualRev. D Revision History Revision Number DateChanges Rev. A Rev. B Rev. C Rev. D 3-98 2-99 5-99 10-02 II Initial Printing Added Additional Module Documentation. Added Revision History. Added Inside Cover Page. Updated Cover Page and Table of Contents. Updated Graphic on Page 1-1. Updated Specifications on Page 1-2. Added Section 7, Module and Schematic Information. Added Section 8, Module Parts Lists. Moved existing Module Parts Lists from Section 6 to Section 8. Added Module Parts Lists for Module CPNs:102139-11, 102140-11, 127321-1, 127323-1, 127353-1, 127373-2, 127354-1, and 127354-2. Added Section 9, Field Service Modifications. Added Section 10, Schematics. Moved all existing Schematics from Section 6 to Section 10. Added Schematics 102141M and 102142M. Updated Cover Page, Revision History and Table of Contents. Revised fan part no. from 125400-3 to 133551-1. Updated phone number area code. Updated sections 1.2, 1.3.6, 7.2, 7.2.1, 7.2.3, 7.3, 7.3.2, 7.3.3, 7.4.1, 9.2, 9.4. Added Module Parts Lists for Module CPNs: 102140-9 revB, 126883-2 rev B, 127321-2, 127323-2, 127353-3, 127354-3, 127451-4 and 127452-4. Added Schematics 127451-4 and 127452-4. Added Assembly Parts List for CE1000A and CE2000A Domestic. Revised Crown logo. Updated Cover Page, Revision History and Table of Contents. CE Series Service ManualRev. D This page intentionally left blank III CE Series Service ManualRev. D Table of Contents IV 1 Introduction . 1-1 1.1 The CE-Series . 1-1 1.2 Warranty . 1-1 1.3 Specifications . 1-2 1.3.1 Performance . 1-2 1.3.2 Power. 1-2 1.3.3 Controls . 1-2 1.3.4 Indicators. 1-2 1.3.5 Input/Output . 1-2 1.3.6 Connectors . 1-2 1.3.7 Construction . 1-2 2 Maintenance. 2-1 2.1 Surface Mount Technology . 2-1 2.2 Cautions and Warnings. 2-1 2.3 Troubleshooting . 2-1 2.3.1 Pre-AC-Checks. 2-1 2.3.2 Main Module Removal . 2-2 2.3.3 Static Checks . 2-2 2.4 Checkout/Adjustment Procedures . 2-2 2.4.1 Equipment Required. 2-3 2.4.2 Initial Conditions . 2-3 2.4.3 Test Procedure. 2-3 2.4.4 Service Kit Wire Extensions . 2-3 3 Circuit Theory . 3-1 3.1 Front End Operation. 3-1 3.2 Balanced Gain Stage. 3-1 3.3 Variable Gain Stage . 3-1 3.4 Error Amp. 3-2 3.5 Voltage Amplification . 3-2 3.5.1 Voltage Translator . 3-2 3.5.2 Last Voltage Amplifier. 3-2 3.5.3 Bias Servo . 3-2 3.2.2 Output PCA . 3-3 3.6 Output Topology . 3-2 3.6.1 Pre-Driver . 3-3 3.6.2 Driver . 3-3 3.6.3 Output Devices. 3-3 3.6.4 Flyback Diodes. 3-3 3.6.5 Output Terminating Network. 3-3 3.7 Power Supply. 3-3 3.7.1 Low Voltage Supply. 3-3 3.7.2 Bootstrap Supply. 3-3 3.7.3 High Voltage Supply. 3-4 CE Series Service ManualRev. D Table of Contents V 3.8 Protection Circuitry. 3-4 3.8.1 Time Dependent VI Limit . 3-4 3.8.2 Temperature Protection . 3-5 3.8.3 Low-Frequency and Short-Circuited Protection. 3-5 3.8.4 Input Compressor. 3-5 3.8.5 Turn-On Delay. 3-6 3.8.6 Output Relay Muting. 3-6 3.8.7 Input Muting . 3-6 3.8.8 Auxiliary Output Jack . 3-6 3.9 Fan Control Circuitry . 3-6 4 Neutrik Connectors . 4-1 5 Parts . 5-3 5.1 General Information . 5-3 5.2 Standard and Special Parts . 5-3 5.3 Ordering Parts . 5-3 5.4 Shipment. 5-3 5.5 Terms . 5-3 6 Exploded Views, Parts Lists . 6-1 Assy. CE 1000 Domestic. 6-2 Assy. CE 1000 PWA also, a detented rotary level control for each channel. Back Panel: A two-position input sensitivity switch located below the input connectors. Can be set to 1.4 V for full output into an 8-ohm load, or set to a fixed voltage gain of 26 dB; Some models have an internal jumper located on the Main PWA for setting optional 0.775V sensitivity. A two-position mode switch located below the input connectors. When turned to stereo, the amplifier operates as two independent channels. When in “bridge-mono” mode the amplifier bridges the two output channels for twice the output voltage. 1.3.4 Indicators A green LED SIGNAL indicator for each channel, which flashes when a very low level signal (40 dBm) is present at input. A red LED CLIP indicator for each channel which turns on when distortion becomes audible in the amplifier output. A red FAULT indicator which will blink under 5 different conditions: 1. When the amplifier is first powered up, until the unit is ready for operation. 2. If the heatsinks reach a temperature above nor- mal working limits. 3. If the transformer thermal protection circuit is acti- vated. 4. If the load on the amplifier develops a short- cir- cuit. 5. Should the amplifier ouput stage become non-op- erational. A green LED POWER indicator that turns on when the am- plifier has been turned on and has power. 1.3.5 Input/Output Input Stage: Input is electronically balanced and employs precision 1% resistors. Input Impedance: Nominally 20 K ohms, balanced. Nominally 10 K ohms, unbalanced. Input Sensitivity: 1.4 volts for standard 1-kHz power or fixed 26-dB gain. Output Impedance: <20 milliohms in series with less than 3 microhenries in stereo mode. DC Output Offset: <10 millivolts. 1.3.6 Connectors Inputs: One Neutrik Combo connector for each channel which features a balanced 1/4-inch phone jack and a 3-pin female XLR connector, in parallel with a barrier strip termination. Outputs: Two Neutrik Speakon NL4MP (mates with NL4FC) output connectors. Optional binding post and barrier block output adaptors are available on the CE 1000A and CE2000A, and are standard on some models. 1.3.7 Construction Rugged steel chassis formed into a durable package that is coated with enviromentally friendly powder for long life and ease of maintenance. Introduction 1-2 CE Series Service ManualRev. D Dimensions: Standard 19-inch (48.3-cm) rack mount width (EIA RS-310-B), 5.25-inch (13.34-cm) height and 12.25-inch (31.11-cm) depth behind front mounting surface. Weight: The CE 1000 weighs 32.6 pounds (14.79 kg). The CE 2000 weighs 40.3 pounds (18.28 kg). For shipping weight, add 6 lbs (2.7 kg) to each amp. Mounting: Standard EIA 310 front-panel rack mount. Introduction 1-3 CE Series Service ManualRev. D LETHAL energy levels! Be very careful when making connections. Do not attempt to change output wiring until the amplifier has been off at least 10 seconds. WARNING: This unit is capable of producing high sound pressure levels. Continued exposure to high sound pressure levels can cause permanent hearing impairment or loss. User caution is advised and ear protection is recommended when using at high levels. WARNING: Do not expose this unit to rain or moisture. WARNING: Only properly trained and qualified technicians should attempt to service this unit. There are no user serviceable parts inside. WARNING: When performing service checks with the power off, discharge the main power supply filter capacitors fully before taking any measurements or touching any electrical components. A 300-ohm 10-W resistor is recommended for this. Hold the resistor with pliers, as the resistor may become extremely hot. WARNING: Under load, with a sine wave signal at full power into both channels, the amplifier may draw in excess of 30 amperes from the AC service mains. WARNING: When performing tests in Section 2.3, do not connect any load to the amplifier until instructed to do so. There is no danger to the amplifier in operating without any load (open outputs). WARNING: Do not change the position of the Mode Switch when the amplifier is turned on. If the position of this switch is changed while the amplifier is powered, transients may damage your speakers. WARNING: Heatsinks are not at ground potential. Simultaneously touching either heatsink and ground, or both heatsinks will cause electrical shock. CAUTION: Eye protection should be worn at all times when protective covers are removed and the amplifier is plugged in. CAUTION: When performing tests in Section 2.3 that require a load, the load must be resistive and must be capable of handling 1000 W (per channel). CAUTION: Disconnect the power cord before installing or removing any cover or panel. CAUTION: : Electrostatic discharge will destroy certain components in the amplifier. Techicians must have approved ESD protection. Proper grounding straps and test equipment are required. 2.3 Troubleshooting 2.3.1 Pre-AC-Checks A number of checks can be made prior to powering up the unit. These should be done in order to prevent an unwanted disaster when turning the unit on. Once these checks are made, power may be applied for further checks. Note: It will be necessary to remove the top panel for complete access to all modules. 2 Maintenance Fundamentally, troubleshooting involves looking for an abnormal situation. When a problem has been observed, it is obvious that something is not doing what it is ex- pected to do. A single part, solder joint, or trace is usu- ally the root cause, and testing for typical voltages and signal tracing can usually result in a solution for most of the problem units. Unfortunately, there are two other sce- narios. (1) Sometimes a single problem may cause other parts to fail so there will be several parts that must be replaced. In this case, however, finding the root cause is not as important as just finding all of the blown or dam- aged parts and replacing them. The failed part will prob- ably (but not always) be among them and the act of replacing the parts will fix the amplifier. (2) If the ob- served behavior is an oscillation, high THD, or the output slammed to one of the rails, the very nature of a feed- back amplifier will spread this effect throughout the power amplifier section. This troubleshooting guide and a fa- miliarity with amplifier operation should help you fix what- ever comes your way! 2.1 Surface Mount Technology The CE-Series amplifiers use surface mount technology in their design. There are several advantages to using surface mount technology (SMT), including; (1) surface mount devices (SMDs) are much smaller, and