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1、I DUKANE POWER AMPLIFIER 250 WATT DIRECT COUPLED MODEL 1A2250 Installation, Operation and Service Manual ? 403-314 DUKANE CORPORATION COMMUNICATIONS SYSTEMS DIVISION ST CHARLES. ILLINOIS 60174 RadioFans.CN 收音机爱 好者资料库 2 CONTENTS ? Section 1 Page GENERAL INFORMATION 1.1 INTRODUCTION . . . . . . . . .
2、. . . . .pAGE l-l 1.2 GENERALDESCRIPTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 1.3 TECHNICALSPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . t-1 2 INSTALLATION INFORMATION ? 3 4 Figure 2-l 2-2 3-l 4-l 2.1 INTRODUCTION.2-l 2.2UNPACKING.2-l 2.3 EQUIPMENT MOUNTING. 2-1 2.4POWERCONNECTIONS. 2-1 2.5 EXTERNALCONNECTIONS. 2-2 OPERATING INFORMATION 3.1 CONTROLSANDINDICATORS . .
4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1 SERVICE INFORMATION 4.1 INTRODUCTION .,._._,._.,. 4-1 FIGURES Description page AC Supply Input and Fuse Assembly. . . . . . . . ._. . . . . . . . . . . . . . . .
5、. . . 2-l lA2250RearPanelView. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 1 A2250 Front Panel View ._._._. . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-l lA2250 Chassis MountedComponents andCircuitBoardLocations . . . . . . . . . . . . . . . . . . . . . . . . 4-1 ii RadioFans.CN 收音机爱 好者资料库 GENERAL INFORMATION 1.1 INTRODUCTION This manual provides installation,operating, and service
7、 information for the Model 1A2250 250 wan Direct Coupled Power Amplifier manufactured by the Dukane Corporation, St. Charles, Illinois 60174. This manual is divided into four sections as follows: 1. General Information 2. Installation Information 3. Operating Information 4. Service Information 1.2 G
8、ENERAL DESCRIPTION The Dukane Model lA2250 Direct Coupled Power Amplifier is designed for use in auditoriums, gymnasiums, and in field applications where professional sound quality is required. Output level is indicated by a VU light bar. The amplifier is protected from damage which could result fro
9、m an over temperature condition in the output stage circuitry. A foldback circuit is employed to prevent damage in case of a short circuit developing in the speaker line(s) served by the amplifier. The amplifier may be operated with either unbalanced or balanced input. An optional input plug-in tran
10、sformer allows for balanced operation. The output of the amplifier can be either unbalanced (direct coupled) or balanced. An optional plug-in transformer allows for balanced output. 1.3 TECHNICAL SPECIFICATIONS CONTINUOUS AVERAGE POWER OUTPUT: 250 watts. HARMONIC DISTORTION: Less than .05% LB 1 kHrf
11、 rated output). Less than 0.5% 1 kHz ! rated output) for transformer option. FREQUENCY RESPONSE: %2O,BCkY Hz, +2dB (direct coupled). 25-20,OClB Hz, -3dB, +ldB (transformer). SIGNAL TO NOISE RATIO: Greater than -1OWB below rated output (20-20,BOB Hz bandwidth). INPUT SENSITIVITY: 1 volt rms 1kHz for
12、rated output. INPUT IMPEDANCE: 1Ok ohms unbalanced, 15k ohms balanced tusing 3A23Dinputtransformer. OUTPUT IMPEDANCE: 4 ohms direct unbalanced. 8 ohms (25 and 70.7V) balanced (output transformer option). OUTPUT REGULATION: Direct, 0.5dB no load to full load IkHr. Transformer, 1dB no load to full loa
13、d 1 kHz. CONTROLS: Volume Control. AC Switch. INDICATORS: Power On LED. :Over Temperature LED. Color Bar VU Graphic. POWER SOURCE: 12Ol24B volts, 5o/BB Hz. l - l RadioFans.CN 收音机爱 好者资料库 1.3 TECHNICAL SPECIFICATIONS (Continued) POWER REQUIRED: 60 watts idle; 600 watts at full rated out- put. TERMINAT
14、IONS: Screw terminal strips. FUSE: 6.25 amperes, 26OV. Slow Blow (120 Vat). - or - 3.2 amperes, 25CV, Slow Blow (240 Vat). FINISH: Charcoal, baked enamel. l-2 DIMENSIONS: 5-l/4” (13.3cm) high, 19” (48.3cm) wide, 14” (36 cm) deep (without optional 3A230 Input Transformer); 15-3/4” (40.5 cm) deep (wit
15、h 3A230). NET WEIGHT: 33 pounds (14.9 kg). ASSOCIATED EQUIPMENT: Model 3A230 Input Transformer. Model 438-547 Output Transformer Kit. SECTION 2 INSTALLATION INFORMATION 2.1 INTRODUCTION This Section of the manual contains unpacking, mounting, and wiring instructions. The information is arranged to f
16、acilitate an orderly installation. Installers should have a good understanding of this information prior to beginning installation of the amplifier. 2.2 UNPACKING Examine the shipping carton and the amplifier. If there is any damage to the unit, bring it to the attention of the distributor from whom
17、 it was purchased. If this unit wasshipped to you, notify the transportation company and place your damage claim without delay. This amplifier was carefully inspected before it was packed and shipped from the Du kane Corporation. 2.3 EQUIPMENT MOUNTING The lA2250 is designed for installation in a st
18、andard 19 inch rack or console. Mount the unit in the designated location using the four mounting screws provided. 2.4 POWER CONNECTIONS The lA2250 amplifier receives ac supply input via the #321-42 fuse assembly. This assembly has a removable jumper card that allows the amplifier to operate on eith
19、er 120 or 240 Vat. depending on how the jumper card is installed in the fuse assembly. Refer to Figure 2-l. OLE IN CARD FUSE PULL LEVER Figure 2-1. AC Supply Input and Fuse Assembly To replace fuse (FlOl), remove the ac plug, slide the plastic cover up to expose the fuse Move the lever labeled FUSE
20、PULL upward to pop the fuse. lnsart the new fuse, moving the laver downward. 2-l The voltage selection is visible on the jumper card, either 120 or 240 when the card is inserted into the fuse assembly. To change input voltage from 120 Vac to 240 Vac, or vice versa, remove the fuse as explained above
21、, insert the point of a ball-point pen or pencil into the hole in the card and slide the card out of the assembly.Turn the card so that the desired voltage shows on the upper left-hand side of the card. Slide the card back into the assembly. Replace the fuse. NOTE Install the correct value of fuse (
22、F101) as follows: For 120 Vac operation:6.25 amperes, 25OV. Slow Blow. For 240 Vacoparation: 3.2 amperes, 25OV. Slow Blow. 2.5 EXTERNAL CONNECTIONS External connections are made to screw terminal strips TS1 and TB101 as shown in Figure 2-2. When the optional output transformer 438-547 is used (balan
23、ced output), the jumpers between terminals 1 and 3 and 2 and 4 on TS1 must be in place. Plug the transformer into socket Pl. See Figure 4-l for location of Pl. When the output transformer is not used (unbalanced operation), the jumpers are not required. Make external output connections to terminal s
24、trip TSl. For unbalanced operation, the speakers connect to terminals 1 and 2. For balanced operation, the speakers connect to terminals 5, 6, or 7, depending on the output desired, and terminal 8. TB101 is for the input connections. When the optional 3A230 Input Transformer is not used, jumpers bet
25、ween terminals 4 and 7 and between terminals 5 and 6 of the octal socket must be in place. When the 3A230 is to be used for a balanced input, remove the jumpers and plug the 3A230 into the octal socket. Make external output connections to terminal strip TS1, as required for your particular applicati
26、on. I Figure 2-2. 1A2250 Rear Panel View 2-2 SECTION 4 SERVICE INFORMATION 4.1 INTRODUCTION Standard electronic components are used in the Dukane Model lA2250 250 Watt Direct Coupled Amplifier.All replacement parts listed in the “Repair Parts List” are available through an authorized Dukane distribu
27、tor, dealer, or from the factory. Any amplifier failure requiring circuit repairs should be referred to an authorized dealer or repair facility in your area. Further damage can result from improper repairs.For chassis mounted components and for each circuit board making up the amplifier, the parts a
28、re shown first, followed by the parts location, and finally by the schematic drawing. Repair Parts List - Chassis Mounted Components (Schematic Drawing 190-28051 Legend Description Dukane Part Number C101, 102 CR101 CR102 DS101, 102 F101 F101 R101 R102 S101 T101 - - - - Capacitor, 15OOOuF, lOOV, Ele
29、ctrolytic 199-9332 Rectifier, Silicon595-44 Rectifier, Bridge, 400V 595-71 Diode, Light Emitting230-8005 Fuse, 6.25A. 25OV. Slow Blow (120 Vac operation) 320-010-0625 Fuse, 3.2A, 25OV. Slow Blow (240 Vac operation) 320-010-0320 Potentiometer, 10k Ohm, Linear 601-398 Resistor, 6800 Ohm, 5W. 5%600-105
30、0-682 Switch, Rocker680-818 Transformer, Power710-4293 Fuse Assembly, Voltage Selector/Receptacle 32142 438-547 Output Transformer Kit (Optional) 710-2173 129 Vac Power Cord (Furnished)200-554 240 Vac Power Cord (Order Separately) 200-556 TTQTSTOT, DS102DS101CR102R101 CR101 , R102 BOARD F101 110-314
31、0 BOARD 110-3124 BOARD Figure 4-l.1A2250 Chassis Mounted Components and Circuit Board Locations 4-l 45 Repair Parts List - 1 lo-3133 Speaker Protector and Output Delay (Schematic Drawing 190-2790) Legend Description Dukane Part Number Cl, 2 c 3 c 4 c 5 C6 CRI-CR3 Kl Q1,2 Rl R 2 R3 R 4 R5,9 R6,10 R7
32、R 6 R11 R12 R13 Ul Capacitor, 1 uF. 35V, Electrolytic 199-2054-105 Capacitor, 6.8uF. 5OV, Electrolytic199-2062-685 Capacitor, O.luF, 5OV. Ceramic 199-9327 Capacitor, 33uF, 25V, Electrolytic199-2063-336 Capacitor, O.luF, 20OWVDC. Electrolytic 199-4046-l 04 Rectifier, Silicon 595-44 Relay, i 2Vdc, 2 F
33、orm C 596-250 Transistor, MPS6566720-47 Resistor, 3 Megohm, 1/4W, 5%600-0039-305 Resistor, 1.6 Megohm. 1/4W, 5%600-0039-185 Resistor, 1.5 Megohm, 1/4W, 5%6006(139-l 55 Resistor, 1.3 Megohm, 1/4W, 5% 600-0039-l 35 Resistor, 1300 Ohm, 1/4W, 5% 600-0039-132 Resistor, 1Ok Ohm, 1/4W, 5% 600-0039-l 03 Resistor, 1500 Ohm, 1/4W. 5% 600-0039-l 52 Resistor, 6800 Ohm, 1/4W. 5% 600-0039-682 Resistor, 1000 Ohm, 1/4W, 5% 600-0039-l 02 Resistor, 33k Ohm, 1/4W, 5%600-0039-333 Resistor, 10 Ohm, 5W, 5% 600-1050-100 Integrated Circuit, 40018 4 0 9 - 5 4
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