Crown_K1,_K2_Series_Service_Manual电路图.pdf

Service Manual KSVCK1K2 03/98 Rev. A K SERIESK SERIESK SERIESK SERIESK SERIES PROFESSIONAL AUDIO AMPLIFIERSPROFESSIONAL AUDIO AMPLIFIERSPROFESSIONAL AUDIO AMPLIFIERSPROFESSIONAL AUDIO AMPLIFIERSPROFESSIONAL AUDIO AMPLIFIERS Models: K1, K2 1999 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219- 294-8000. K Series amplifiers are produced by Crown International, Inc. Trademark Notice: Balanced Current Amplifier is a trademark, and Crown and BCA are registered trademarks of Crown International, Inc. Other trademarks are the property of their respective owners. B A L A N C E D C U R R E N T A M P L I F I E R B A L A N C E D C U R R E N T A M P L I F I E R B A L A N C E D C U R R E N T A M P L I F I E R B A L A N C E D C U R R E N T A M P L I F I E R Enable Clip Thermal Signal IOC 2 Enable Clip Thermal Signal IOC 2 1 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 11 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 1 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 RadioFans.CN 收音机爱 好者资料库 ? ? K Series Service Manual Rev. A 1999 Crown International, Inc. 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: Plant 2 S.W., 1718 W. Mishawaka Rd., Elkhart IN 46517 Phone: (800) 342-6939/(219) 294-8200 FAX: (219) 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 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 K Series Service ManualRev. A 1999 Crown International, Inc. Revision History Revision NumberDateChanges None Rev. A 3-98 6-99 II Initial Printing Added Revision History, Module and Schematic Information, and Module Parts Sections. Upgraded Manual to Facilitate Component-Level Troubleshooting of PWAs. Updated Cover Page and Table of Contents. RadioFans.CN 收音机爱 好者资料库 K Series Service Manual Rev. A 1999 Crown International, Inc. This page intentionally left blank III K Series Service ManualRev. A 1999 Crown International, Inc. Table of Contents IV 1 Introduction . 1-1 1.1 Introduction. 1-1 1.1.1 The K Series Amplifiers . 1-1 1.2 Warranty. 1-1 1.3 Repair Strategy . 1-2 1.4 Service Procedure . 1-2 2 Specifications . 2-1 2.1 Performance . 2-1 2.2 Controls. 2-1 2.3 Indicators . 2-1 2.4 Input/Output. 2-2 2.5 Output Signal . 2-2 2.6 Protection. 2-2 2.7 Construction. 2-2 3 Theory. 3-1 3.0 Overview . 3-1 3.1 Power Supplies . 3-1 3.1.1 Main Power Supply. 3-1 3.1.2 Low Voltage Supplies . 3-1 3.2 Input Stage . 3-2 3.3 DC Servo. 3-2 3.4 Sleep Circuit . 3-2 3.5 Error Amp. 3-2 3.6 Modulator. 3-2 3.7 Triangle Generator . 3-3 3.8 Proportional Vcc Generator . 3-3 3.9 Output . 3-3 3.10 Output Filter . 3-3 3.11 Current Limiter . 3-3 3.13 Overlap Correction and Adjustment . 3-4 3.14 Display Circuitry. 3-4 3.15 Control Circuitry . 3-4 3.16 Crowbar Circuitry . 3-5 4 Line Voltage Conversion . 4-1 4.1 Line Voltage Conversion . 4-1 5 Maintenance. 5-1 5.1 Where to Begin . 5-1 5.2 Disassembly for Inspection however, some important information is duplicated in this Service Manual in case the Reference Manual is not readily available. NOTE: THE INFORMATION IN THIS MANUAL IS IN- TENDED FOR USE BY AN EXPERIENCED TECH- NICIAN ONLY! 1.1.1 The K Series Amplifiers The K Series of power amplifiers are efficient, com- pact, high-power audio amplifiers designed for pro- fessional use. They provide full audio bandwidth, high- power amplification with minimum distortion. Crowns patented Balanced Current Amplifier design allows for maintenance-free operation with maximum perfor- mance. Other features include convection cooling, balanced inputs, Bridge-Mono operation, “Y” Input for routing one signal to both channels, and input com- pression for maximum loudspeaker protection. 1.2 Warranty Each 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-Year Full Warranty (includ- ing round trip shipping within the United States), all warranty service 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 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 questions regarding the warranty of a product, please contact the Field Service Manager or the Tech- nical Support Group. Crown Customer 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 B A L A N C E D C U R R E N T A M P L I F I E R B A L A N C E D C U R R E N T A M P L I F I E RB A L A N C E D C U R R E N T A M P L I F I E RB A L A N C E D C U R R E N T A M P L I F I E R Enable Clip Thermal Signal IOC 2 Enable Clip Thermal Signal IOC 21 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 1 1 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 1 0 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 1000 dB 3 1 5 7 9 11 1315 17 19 21 25 45 30 100 Figure 1.1 The Crown K2 Amplifier 1 Introduction K Series Service ManualRev A. 1-2 Introduction 1999 Crown International, Inc. 1.3 Repair Strategy The Balanced Current Amplifier technology rings in a new era in Crown history. Taking full advantage of the modular design approach used in the design of K Se- ries amplifiers, we are able to offer a module exchange program for this product. The concept is that the PWA (Printed Wire Assembly) as a whole is one compo- nent, and when a part of the assembly is defective, the whole assembly is defective. Exceptions are the Control, Bridge, Display, and Line Filter PWAs. Those PWAs may be repaired at the component level unless there is sufficient damage or malfunction to warrant PWA replacement. Non-PWA components are also ex- cluded from this program. Under the module exchange program, defective PWAs are returned to Crown for evaluation and re- work. The reworked assemblies will then be stocked in the Crown Parts Department to be sold as refur- bished parts. This strategy offers several advantages. One advan- tage is less time spent in troubleshooting and repair- ing the amplifier, thus resulting in greater customer satisfaction. This strategy also allows Crown to col- lect the necessary information from amplifier failures, so improvements can be made for even greater prod- uct reliability. 1.4 Service Procedure Servicing a Balanced Current Amplifier requires cer- tain steps to be followed. See Figure 1.2 for a flow chart of these steps. It is important that the defective Printed Wire Assemblies (PWAs) be returned to Crown for evaluation and repair. Under the module exchange program, warranty claims for PWA replacement will not be honored unless the defective PWA accompa- nies the warranty claim. In the event of a non-war- ranty repair, rebuilt PWAs will be available at a lower price than new PWAs, and a discount will be given if the defective PWA is returned to Crown. Each PWA purchased from the Crown parts depart- ment will have a tag indicating that it is “Available for Issue.” This tag will have two parts. The first part sim- ply states that the PWA is ready for use. It also has instructions for the PWA and the serial number of the module. Once the new PWA is installed, this part is to be discarded. The second part will be filled out by the service technician. After it is filled out with data such as the amplifier serial number and a description of the failure, it will be attached to the failed PWA. This part has three copies. The first is for the service center to keep. Copies 2 and 3 will remain together for use at Crown. WARNING Component-level troubleshooting and repair of PWAs included in the module exchange program should not be attempted without expressed autho- rization from the Crown Audio Service Manager. Such an attempt, without specialized training and specialized test equipment, will likely result in sub- stantial damage to the amplifier. Crown will not authorize payment of warranty claims in such an instance. K Series Service ManualRev A. Introduction 1-3 1999 Crown International, Inc. Figure 1.2 Service Procedure Flow Chart K Series Service ManualRev A. 1-4 Introduction 1999 Crown International, Inc. This page intentionally left blank K Series Service ManualRev A. Specifications 2-1 1999 Crown International, Inc. All specifications relate to both Export and Domestic units, regardless of voltage and frequency. 2.1 Performance Frequency Response 0.25 dB from 20 Hz to 20 kHz. The frequency re- sponse is band limited with an 8-Hz double-integrated 3rd-order Butterworth high-pass filter and a 30-kHz 7th- order Gaussian low-pass filter. Output Power Measured at 1 kHz with both channels driven to 0.1% or less true THD. K1 2 ohm Stereo: 750 watts per channel. 4 ohm Stereo: 550 watts per channel. 8 ohm Stereo: 350 watts per channel. 4 ohm Bridge Mono: 1,500 watts. 8 ohm Bridge Mono: 1,100 watts. K2 2 ohm Stereo: 1,250 watts per channel. 4 ohm Stereo: 800 watts per channel. 8 ohm Stereo: 500 watts per channel. 4 ohm Bridge Mono: 2,500 watts. 8 ohm Bridge Mono: 1,600 watts. Signal-to-Noise Ratio Greater than 100 dB below rated power, A-weighted. Voltage Gain 1.4 VRMS input sensitivity or a fixed gain of 26 dB (back panel switchable). Damping Factor Greater than 3,000 from 10 Hz to 400 Hz. Line Voltage Requirements Universal power supply can be configured to operate with 100, 120, 200, 230, 240 or 250 VAC at 50 or 60 Hz. 2.2 Controls Level A calibrated rotary level control for each channel lo- cated on the front panel. Each control is labeled from 0 to 100 dB of voltage attenuation. Power An on/off rocker switch located on the front panel. Input Sensitivity A twoposition switch for each channel, located on the back panel near each channels input connectors. Can be set to 1.4 V for full output power into an 8-ohm load or a fixed voltage gain of 26 dB. Bridge Output An on/off switch located on the back panel between the input connectors. This switch, when turned on, bridges the two outputs with the channel one input sig- nal. “Y” Input An on/off switch located on the back panel between the input connectors. This switch, when turned on, par- allels the two input channels. 2.3 Indicators Thermal A red LED for each channel which turns on with a dim glow shortly before the amplifier needs help dissipat- ing heat. The LED will turn brighter as the Thermal Level Control (TLC) protection is activated. Clip An orange LED for each channel which turns on when distortion of any type becomes audible in the amplifier output. IOC A yellow LED for each channel which serves as a dis- tortion indicator. This indicator will light long before the distortion is audible. The IOC indicators include a pulse stretching feature that helps make them more notice- able, even with rapid transient signals. Signal A green LED for each channel which flashes dimly when a very lowlevel signal (as low as 10 mW) is present in the output. They flash brightly when a louder signal (at least 1 watt) is present at the output. Enable A green LED that turns on when the amplifier has been turned on and has power. When first turned on, there will be a brief twosecond delay while the amplifier performs a quick turnon diagnostic. Then the Enable indicator will turn on to its full brightness. If no signal is present, the Enabl