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1、Installation and Service KI-1480B DAX60 60-Watt Power Amplifier DAX120 120-Watt Power Amplifier Rauland-Borg Corporation Issued: 07/08/98 Page 1 of 18 RadioFans.CN 收音机爱 好者资料库 Copyright 1998 by Rauland-Borg Corporation, all rights reserved. This document contains users information on technology that
2、is proprietary to Rauland-Borg Corporation. Permitted transmittal, receipt, or possession of this document does not express license or imply any rights to use, sell, design or manufacture this information. No reproduction, publication, or disclosure of this information, in whole or in part, shall be
3、 made without prior written authorization from an officer of Rauland-Borg Corporation. Rauland-Borg Corporation Rauland-Borg Corporation 3450 West Oakton Street Skokie, Illinois 60076-2958 (847) 679-0900 RadioFans.CN 收音机爱 好者资料库 Table of Contents GENERAL INFORMATION. 4 DESCRIPTION. 4 REVISION HISTORY
4、. 4 DRAWINGS, DIAGRAMS, AND OTHER GRAPHICS. 5 PACKING LIST/UNPACKING PROCEDURE. 5 INSTALLATION. 5 Rack-Mounting . 6 Turret-Mounting (DAX6O only) . 6 Input Connections. 7 Output Connections. 7 Selecting Balanced or Unbalanced Output Connections. 7 Grounding the Center Tap. 8 Split-Center-Tap Operatio
5、n. 8 Auxiliary DC Power Supply. 8 POWER CONNECTION. 9 Converting the Amplifiers to 240 VAC. 9 SETTING THE INPUT LEVEL” CONTROL. 9 REPLACING THE FUSE. 9 INITIAL TROUBLESHOOTING.10 SERVICE INFORMATION.11 Locating the Test Points.11 Measuring DC Voltages.11 Measuring AC Voltages.12 Locating the Driver
6、and Power Transistors.12 Removing and Replacing Transistors.13 Testing Transistors.14 DAX6O Circuit Description .14 DAX12O Circuit Description.14 APPENDIX A: LIMITED WARRANTY/SERVICE POLICY.17 LIMITED WARRANTY.17 SERVICE POLICY.18 NKI1480B DAX60 and DAX120 AmplifiersInstallation Page 4 of 18 (Jul-98
7、) General Information Description The Rauland DAX Series amplifiers are designed for use with Raulands institutional program and communication Systems. They offer high-quality sound and dependability. They can be driven to their rated power output by an input signal as low as 0.3 volts. Their transf
8、ormer-isolated, 25-volt balanced output matches the output of Raulands communication panels; they also have a 70.7-volt balanced output. Their outputs can operate with a split center tap with Raulands Telecenter 5000 and Responder 3000 systems. The amplifiers are listed by Underwriters Laboratories.
9、 The DAX amplifiers offer helpful power connections for related equipment: three 120-VAC three-pin grounded outlets, and a floating auxiliary DC power output (28 VDC, 1.2 A) that can be used for Raulands Director Series control panels, preamplifiers, graphic equalizer, and other equipment. The ampli
10、fiers come with black-enamel face panels. Optional brushed-chrome dress panels-the RP2525 (DAX6O) and RP2700 (DAX12O)are available. Revision History This manual has been reformatted. No substantial changes were made during the reformatting process. 1 NKI1480B DAX60 and DAX120 AmplifiersInstallation
11、Page 5 of 18 (Jul-98) Drawings, Diagrams, and Other Graphics This document includes the following drawings, diagrams, and/or supplemental graphics: ? Transistor Replacement DrawingExploded (IL0253) Packing List/Unpacking Procedure Although the amplifier was thoroughly checked at the factory, we reco
12、mmend that you inspect the amplifier, the enclosed parts, and the shipping container for signs of improper handling during shipment. In case of damage, immediately place a claim with the dealer, the distributor from whom you purchased the unit, orif the unit was shipped directly to youwith the carri
13、er. The following parts are included with the amplifier: QuantityPartPart Number 4Rack-mounting screws for tapped holes (10-32 x hex-head, SEMS, unslotted, machine) WA202 4Rack-mounting screws for untapped holes (10 x pan-head, slotted, thread-forming) WA102 4#10 Tinnerman “U” type speed nuts for un
14、tapped rack holes AB1889 Installation The amplifier should be rack-mounted where there is adequate ventilation, a moderate temperature, an AC power outlet, and provisions for grounding. The rack should have the standard 19-inch width and a vertical space of at least 5 1/4 inches (DAX6O) or 7 inches
15、(DAX12O). It is recommended that additional space be left above and below the amplifier to prevent hum from being introduced into adjacent equipment (such as preamplifiers), to provide additional ventilation, NKI1480B DAX60 and DAX120 AmplifiersInstallation Page 6 of 18 (Jul-98) and to allow easier
16、access for servicing. Allowing an inch of space behind the amplifier for connections, the rack requires a total depth of seven inches. A cooling fan is recommended when the rack is enclosed and any of the following conditions exists: ? The combined rated output power of all the equipment exceeds 250
17、 watts RMS; or ? The input from the AC power line exceeds 500 watts; or ? Restricted air flow in the rack may create extreme heat. ? Important: Failure to observe the preceding precautions could result in overheating that could damage the equipment or create a fire hazard. Rack-Mounting The DAX Seri
18、es amplifiers are designed to be mounted into a standard 19-inch rack. #10 U nuts (AB1889) and two kinds of mounting screws are supplied with each amplifier. 1. If the racks holes are untapped, select the #10 thread-forming screws (WA102). Push the #10 U nuts, their flat side facing outward, onto th
19、e proper holes in the rack. (you may have to leave the U nuts off if the holes are extruded). 2. If the racks holes are tapped, select the #10 machine screws (WA202). Turret-Mounting (DAX6O only) The rack-mounting procedures can be used to install the DAX6O in a Rauland Control Turret. However, if t
20、he turrets internal rails are used and the amplifier is oriented with its front panel facing the rear of the turret, an optional MK1O Mounting Kit will be needed. This special-order kit must be installed by factory- trained personnel. ? Important: ? Do not connect AC power to the amplifier until all
21、 of the necessary input and output connections have been completed. ? Do not disconnect the third wire on the power plug. This wire grounds the amplifiers chassis to prevent a possible shock hazard. If an adapter is used to connect the plug to a two-prong socket, make sure that the amplifiers chassi
22、s is connected to a proven earth ground. NKI1480B DAX60 and DAX120 AmplifiersInstallation Page 7 of 18 (Jul-98) Input Connections The input is unbalanced. The input screw terminals are labeled COM (-) and INPUT (+), respectively. The terminal strip is located on the lower right corner, as viewed fro
23、m the rear of the chassis. The signal source should deliver at least 300 millivolts into a 13-kilohm load. To prevent coupling, route the input cables as far from the speaker cables as possible. Output Connections The output screw terminals are located on the upper right corner, as viewed from the r
24、ear of the chassis. The following illustration shows how the output transformers split windings are connected with a factory-installed link for most applications (for applications with the link removed, see Split-Center-Tap Operation, below). Figure 1 The output impedances are as follows: DAX6070.7V
25、 = 83.3 ohms25V = 10.4 ohms DAX12070.7V = 41.6 ohms25V = 5.2 ohms Selecting Balanced or Unbalanced Output Connections The balanced outputs for 70.7 volts and 25 volts are for speakers designed for constant-voltage lines. Each speaker must have a line-matching transformer, and the speakers must be co
26、nnected in parallel. The impedance taps on the primaries of the line-matching transformers indicate how much power will be taken from the line. Speakers can be added as required until the total wattage absorbed by all of the transformers is equal to the rated power output of the amplifier. However,
27、it is good practice to allow an amplifier a headroom of 10% to 20%. For a 60-watt NKI1480B DAX60 and DAX120 AmplifiersInstallation Page 8 of 18 (Jul-98) amplifier, the maximum speaker load should be approximately 50 watts; for a 120- watt amplifier, the maximum speaker load should be approximately 1
28、00 watts. For unbalanced operation, place a jumper between one of the speaker terminals and “GND. Do not ground the center tap when you use unbalanced operation. Grounding the Center Tap If required by the installation, the center-tap terminals may be jumpered to the GND” terminal when the balanced
29、speaker output is used. The GND terminal is next to the negative AUX POWER terminal on the DAX6O; on the DAX12O, the GND terminal is next to the COM input terminal. When the two center-tap terminals are linked together, either one of them may be connected to the GND terminal. ? Important: Do not ins
30、tall a jumper between GROUND and CT with the unbalanced speaker connection: connecting both points to GROUND would create a short circuit across the output transformer Split-Center-Tap Operation The amplifier output transformer can be configured for split-center-tap operation with symmetrical output
31、 voltages on both sides of the center tap. This is intended for special applications with Rauland systems such as the Telecenter 5000 and the Responder 3000. When a DAX amplifier is used with the TC5OOO or the NCS3OOO, (a) no more than 50 watts of power may be drawn through the system, and (b) a TC5
32、007 Transformer Module is required (see KI-1486). If the installation requires an isolated, split-center-tapped output, remove the supplied link from the two CT terminals; this will separate the two halves of the output windings (see OUTPUT CONNECTIONS, above, and the attached KMO7BO). ? Important:
33、There is a large capacitor inside the TC5OOO and the NCS3OOO that provides a low AC impedance across the center taps. The split windings are not designed to be used independently. Auxiliary DC Power Supply The 28-VDC terminals (on the right side of the DAX6O; below the output transformer of the DAX1
34、2O) can provide up to 1.2 Amperes to preamplifiers, Director Series control panels, and other auxiliary devices requiring DC power. Since this supply is floating, it can also be used for devices requiring an isolated NKI1480B DAX60 and DAX120 AmplifiersInstallation Page 9 of 18 (Jul-98) power source
35、, such as Raulands Model 6430 Pink-Noise Source and Model 6431 1/3-Octave Equalizer. Do not mix floating and grounded accessories. Power Connection Plug the power cord into a 120-V, 60-Hz, three-wire grounded outlet that can provide at least 935 watts (DAX6O) or 11O5 watts (DAX12O). Although the amplifier circuits by themselves consume no more than 175 watts (DAX6O) or 345 watts (DAX120), connecting another device to the DC output could consume another 40 watts of power, and a total load of 720 watt
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