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- Page 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...
- Page 2 Copyright 1998 by Rauland-Borg Corporation, all rights reserved. This document contains user’s information on technology that 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 made without prior written authorization from an officer of Rauland-Borg Corporation.
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Page 3: Table Of Contents
Table of Contents GENERAL INFORMATION .............................. 4 ..................................4 ESCRIPTION ................................4 EVISION ISTORY ........................5 RAWINGS IAGRAMS THER RAPHICS ..........................5 ACKING NPACKING ROCEDURE ................................... 5 NSTALLATION Rack-Mounting ................................6 Turret-Mounting (DAX6O only) ............................ 6 Input Connections ................................. 7 Output Connections............................... -
Page 4: General Information
They can be driven to their rated power output by an input signal as low as 0.3 volts. Their transformer-isolated, 25-volt balanced output matches the output of Rauland's communication panels; they also have a 70.7-volt balanced output. Their outputs can operate with a split center tap with Rauland's ® ®... -
Page 5: Drawings, Diagrams, And Other Graphics
NKI1480B DAX60 and DAX120 Amplifiers —Installation Drawings, Diagrams, and Other Graphics This document includes the following drawings, diagrams, and/or supplemental graphics: Transistor Replacement Drawing—Exploded (IL0253) Packing List/Unpacking Procedure Although the amplifier was thoroughly checked at the factory, we recommend that you inspect the amplifier, the enclosed parts, and the shipping container for signs of improper handling during shipment. -
Page 6: Rack-Mounting
2. If the rack's 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 the turret’s 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. -
Page 7: Input Connections
NKI1480B DAX60 and DAX120 Amplifiers —Installation 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 from the rear of the chassis. The signal source should deliver at least 300 millivolts into a 13-kilohm load. -
Page 8: Grounding The Center Tap
The amplifier output transformer can be configured for split-center-tap operation with symmetrical output 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. -
Page 9: Power Connection
NKI1480B DAX60 and DAX120 Amplifiers —Installation power source, such as Rauland's 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). -
Page 10: Initial Troubleshooting
NKI1480B DAX60 and DAX120 Amplifiers —Installation fuse. Use a fast-blow fuse: 2.5 Amps for the DAX6O, 5 Amps for the DAX12O (but only half of these values if the amplifier is operating from a 240-VAC line). The fuse holder is on the rear of the amplifier, below the power transformer. You will need a Phillips screwdriver to remove the center plug;... -
Page 11: Service Information
NKI1480B DAX60 and DAX120 Amplifiers —Installation Service Information Do not attempt to service your amplifiers unless you are an authorized technician. Important: he information that follows is intended for qualified service technicians only Locating the Test Points Whenever possible, take the voltage readings on the large connector on the main printed circuit board. -
Page 12: Measuring Ac Voltages
NKI1480B DAX60 and DAX120 Amplifiers —Installation On the DAX12O: Connect the meter's negative lead to the amplifier common at Connector "J1-13." As you locate each DC voltage on the schematic, note the number of the nearest "J" terminal in that leg of the circuit and, if possible, take the readings between such a “J”... -
Page 13: Removing And Replacing Transistors
NKI1480B DAX60 and DAX120 Amplifiers —Installation Removing and Replacing Transistors Transistors are inherently long-lived devices that normally should not need replacement. If, however, systematic troubleshooting indicates a problem, observe these precautions when removing and replacing transistors: Transistors can be damaged by excessive heat, so use a small soldering iron when removing or replacing a transistor with solder connections. -
Page 14: Testing Transistors
NKI1480B DAX60 and DAX120 Amplifiers —Installation Step 3. After obtaining a high-resistance reading (at least 100 kilohms) between each transistor case and the heat sink, re-establish the connection between the negative side of C503 and the standard connector (DAXI2O only). - Page 15 NKI1480B DAX60 and DAX120 Amplifiers —Installation Input and preamplifier circuits: Resistor R1 and Capacitors Cl and C507 filter Radio Frequency Interference (RFI). RV1 is the input LEVEL control (potentiometer), which controls the signal that is applied to the preamplifier circuits. Capacitors C2 and C9 govern the low-frequency response of the input signal, to protect horn-type speakers.
- Page 16 NKI1480B DAX60 and DAX120 Amplifiers —Installation Full RPO 175 Watts 345 Watts DAX60 DAX120 AC Power Consumption No Signal 50 Watts 50 Watts (28 VDC Auxiliary Output 1/3 RPO 145 Watts 250 Watts Fully Loaded) Full RPO 215 Watts 385 Watts...
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Page 17: Appendix A: Limited Warranty/Service Policy
Rauland-Borg and found by our inspection to be defective in materials and workmanship. The obligation of Rauland-Borg Corporation is limited to the... -
Page 18: Service Policy
Service Policy The entire Rauland-Borg organization is interested in the proper maintenance of your equipment for as long as you own it. Our national network of Rauland-Borg distributors is at the service of all purchasers of our products. Should you have a problem with your equipment, or require any advice or assistance, contact your local Rauland-Borg distributor.