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1、1 1 DAX60 60-WATT POWER AMPLIFIER DAX120 120-WATT POWER AMPLIFIER INSTALLATION AND SERVICE KI-1480 RAULAND-BORG CORPORATION ? 3450 West Oakton Street, Skokie, Illinois 60076-2951 ? (708) 679-0900 GENERAL DESCRIPTION The Rauland DAK Series amplifiers are designed for use with Raulands institutional p
2、rogram 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 transformer-isolated, 25-volt balanced out- put matches the output of Raulands communication panels; they also have a 70.7-v
3、olt 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, The DAX amplifiers offer helpful power connections for related equipment: three 120-VAC three-pin grounded outlets,
4、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 amplifiers come with black-enamel face panels. Optional brushed- chrome dress panels-the RP2525 (DAX6O) and RP2700 (DAX120
5、)-are available. UNPACKING The amplifier was thoroughly checked at the factory. Inspect the amplifi- er, the enclosed parts,and the shipping container for signs of improper han- dling during shipment. In case of damage,immediately place a claim: with the dealer or distributor from whom you purchased
6、 the unit or-if the unit was shipped directly to you-with the carrier. The following parts are included with the amplifier: D e s c r i p t i o nQty. Rauland Part No. 4 Rack-Mounting Screws for tapped holes (l0-32 x hex-head, WA202 SEMS, unslotted, machine). 4 Rack-Mounting Screws for untapped holes
7、 (10 x pan-head, WA102 slotted, thread-forming). 4 #l0 Tinnerman U type Speed Nuts, for untapped 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
8、 standard 19-inch width and a vertical space of at least 5 inches (DAX6O) or 7 inches (DAX120). It is recommended that addition- 01987 RAULAND-BORG CORPORATION PRINTED IN U.S.A. 7/87 Page 1 of 17 RadioFans.CN 收音机爱 好者资料库 al space be left above and below the amplifier to prevent hum from being intro-
9、duced into adjacent equipment (such as preamplifiers), to provide additional ventilation,and to allow easier access for servicing. Adding an inch of space behind the amplifier for connections,the rack should have a total depth of seven inches. A cooling fan is recommended when the rack is enclosed a
10、nd any of the following conditions obtains: (a) The combined rated output power of all the equipment exceeds 250 watts RMS; OR (b) The input from the AC power line exceeds 500 watts; OR (c) Restricted air flow in the rack may create extreme heat. CAUTION FAILURE TO OBSERVE THE PRECEDING PRECAUTIONS
11、COULD RESULT IN OVERHEATING THAT COULD DAMAGE THE EQUIPMENT OR CREATE A FIRE HAZARD. Rack-Mounting The DAK Series amplifiers are designed to be mounted into a standard 19- inch rack. #lO U nuts (AB1889) and two kinds of mounting screws are supplied with each amplifier. A. If the racks holes are unta
12、pped,select the #10 thread-forming screws (WA102). Push the #l0 U nuts,their flat side facing proper holes in the rack (you may have to leave the U holes are extruded). outward, onto the nuts off if the B. If the racks holes are tapped, select the #10 machinescrews (WA202). Turret-Mounting (DAX60 on
13、ly) The rack-mounting procedures can be used to install the Control Turret. However,if the turrets internal rails are DAX60 in a Rauland used and the am- plifier is oriented with its front panel facing the rear of the turret, an optional MKlO Mounting Kit will be needed. This special-order kit must
14、be installed by the factory. WARNING DO NOT CONNECT AC POWER TO THE AMPLIFIER UNTIL ALL OF THE NECESSARY INPUT AND OUTPUT CONNECTIONS HAVE BEEN COMPLETED. Page 2 7/87 RadioFans.CN 收音机爱 好者资料库 Grounding CAUTION DO NOT DISCONNECT THE THIRD WIRE ON THE POWER PLUG. THIS WIRE GROUNDS THE AMPLIFIERS CHASSI
15、S TO PREVENT A POSSIBLE SHOCK HAZARD. IF AN ADAPTER IS USED TO CONNECT THE PLUG TO A TWO-PRONG SOCKET, MAKE SURE THAT THE AMPLI- FIERS CHASSIS IS CONNECTED TO A PROVEN EARTH GROUND. INPUT CONNECTIONS The input is unbalanced. The input screw terminals are labeled COM (-) and INPUT (+), respectively.
16、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. Route the input cables as far from the speaker cables as possible, to prevent coupling. OUTPUT CONNECTIONS The output screw
17、 terminals are located on the upper right corner, as viewed from the rear 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-Cen- ter-Tap Oper
18、ation, below). 70.7V (Link) 25V CT CT 25V 70.7 v VOLTAGE TAPS OF THE DAX SERIES AMPLIFIERS IL0252 The output impedances are DAX6O: 70.7V = 83.3 DAX120: 70.7V = 41.6 as follows: ohms; 25V = 10.4 ohms. ohms; 25V = 5.2 ohms. Page 4 7/87 Selecting Balanced or Unbalanced Output Connections The balanced o
19、utputs for 70.7 volts and 25 volts are for speakers designed for constant-voltage lines. Each speaker must have a line-matching transform- er,and the speakers must be connected in parallel. The impedance taps on the primaries of the line-matching transformers indicate how much power will be taken fr
20、om 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,it is good practice to allow an amplifier a headroom of 10% to 20%. For a 60-watt amplifier,the maximum speaker load should be ap- p
21、roximately 50 watts; for a 120-watt amplifier,the maximum speaker load should be approximately 100 watts. For unbalanced operation, place a jumper between one of the speaker termi- nals you are using and GND. Do not ground the center tap when you use unbal- u n anced operation. Grounding the Center
22、Tap If required by the installation,the center-tap terminals may be jumpered to the GND terminal when the BALANCED speaker output is used. The GND terminal is next to the negativeAUX POWER terminal on the DAX60; on the DAX120, the GND terminal is next to the COM input terminal. When the two center-t
23、ap terminals are linked together,either one of them may be connected to the GND terminal. DO NOT INSTALL 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
24、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. When a DAX amplifier is used with the TC5
25、000 or the NCS3000, (a) no more than 50 watts of power may be drawn through the system, and (b) a TC5007 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
26、halves of the output windings (see OUTPUT CONNECTIONS, above,. and the attached KMO780). Note: There is a large capacitor inside the TC5000 and the NCS3000 that provides a low AC impedance across the center taps. The split windings are not designed to be used independently. Auxiliary DC Power Supply
27、 The 28-VDC terminals (on the right side of the DAX60, below the output transformer of the DAX120) 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
28、 7/87 Page 5 isolated power source, such as Raulands Model 6430Pink-Noise Source and Model 6431 l/3-Octave Equalizer. Do not mix floating andgrounded 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 1105
29、watts (DAX120). Although the amplifier circuits by themselves consume no more than 175 watts (DAX60) or 345 watts (DAX120), connecting another device to the DC output could consume anoth- er 40 watts of power,and a total load of 720 watts could be connected to the three AC sockets. Check the local r
30、egulations before installing permanent AC lines and plugging in the equipment. Converting the Amplifiers to 240 VAC If operation from a 240-VAC power source is desired, remove the front cover and locate the 12OV/240V switch inside the amplifier, on the right. Use a small screwdriver to slide the swi
31、tch to the 24OV side. Resecure the front cover. Replace the fuse with a fast-blow, 240-volt fuse with half the current rating of the supplied fuse;the new value would be 1.25 Amps for the DAX60, 2.5 Amps for the DAX120 (see REPLACING THE FUSE, below). Replace the plug on the power cord with one appr
32、oved for 240-VAC operation. CAUTION: When the amplifier is connected to a 240-volt supply, its three 120 VAC convenience outlets will supply 240 volts. Accordingly, they should not be used when the amplifier is connected to 240 volts. SETTING THE INPUT LEVEL CONTROL The input-level control,marked LE
33、VEL on the rear chassis below the out- put transformer (see Figure l), can be adjusted with a -inch flat-blade screw- driver: turning the control clockwise will increase the output level. This control should be set so that the maximum possible input signal will not cause the output to clip. After th
34、is control has been adjusted by the installer, it should be left alone. REPLACING THE FUSE A current surge during operation may cause the fuse to blow. To restore power to the amplifier, first ascertain what the problem is and correct it before replacing the fuse. Use a fast-blow fuse: 2.5 Amps for
35、the DAX60, 5 Amps for the DAX120 (but only half of these values if the amplifier is oper- ating from a 240-VAC line). The fuse holder is on the rear of the amplifier, below the power trans- former. You will need a Phillips screwdriver to remove the center plug; you may find a scissors-nosed pliers h
36、elpful in removing the fuse. If the replace- ment fuses continue to blow, unplug the amplifier and consult a qualified ser- vice representative. Page 6 7/87 INITIAL TROUBLESHOOTING Problem 1) Low volume or distorted sound. 2) The amplifier does not operate. 3) The 28-VDC output cycles off and on, or
37、 it remains off. Possible Causes (a) (b) (a) (b) (c) (a) (b) Check whether all the input and output connections are properly made and securely fastened. If the sound is distorted, check whether the speak- ers are being overdriven (e.g., does the distortion go away when the level control is turned do
38、wn?). Make sure that the power cord is plugged in and that there is power in the outlet. Examine the input and output lines for (1) obvious shorts (among themselves and between them and the chassis or surrounding equipment) and (2) broken connections. If everything appears in order, try replacing th
39、e fuse. If the amplifier still fails to respond, unplug the power cord and contact your local Rauland distributor. There are two circuit breakers protecting this output. CB2 is a 1.6-Amp thermal breaker that shuts down the circuit when the DC current flow significantly exceeds the outputs 1.2-Ampere
40、 rat- ing,then automatically resets. It will continue cycling off and on until the problem is corrected. If the amplifier remains off, CBl (3.15 Amps) may have tripped. Check for a short in the connec- tions,then try manually resetting CBl by poking a small screwdriver through the access hole in the
41、 front cover (at the upper left corner of the DAX6O, or the lower left corner of the DAX120). If the problem does not lie in the load or the connections,one of the breakers may be defective. Disconnect the load and call your Rauland distribu- tor. 7/87 Page 7 SERVICING INFORMATION THE INFORMATION TH
42、AT FOLLOWS IS INTENDED FOR QUALIFIED SERVICE TECHNICIANS. Locating the Test Points Whenever possible,take the voltage readings on the large connector on the main printed circuit board. You will have to remove the front cover to access it. The DAX60 has a single 16-pin connector labeled T on the sche
43、matic; the pins are numbered from bottom to top on the board. The DAX120 has two 16-pin connectors: the top connector and the top half of the bottom connector are referred to as Jl on the schematic, and the rest of the bottom connector is referred to as J2 on the schematic. The pins are numbered l-2
44、4 and l-8, from top to bottom on the board. Measuring DC Voltages DC voltages are printed in rectangular boxes at various points on the schematic. When measuring these voltages on the amplifier, use a DC meter with a resistance of 1 megohm per volt and proceed as follows: Step 1.Place the amplifier
45、on a suitable work surface and make sure that no signal is present at the input terminals. Disconnect the speakers and con- nect a suitable resistive load in their place: DAX6O: The load should have at least a 60-watt power rating and a value of 10.4 ohms across the 25-volt output or 83.3 ohms acros
46、s the 70.7-volt output). DAX120: The load should have at least a 120-watt power rating and a value of 5.2 ohms across the 25-volt output or 41.6 ohms across the 70.7-volt output). Step 2. Plug the amplifier into a 120-VAC, 60-HZ source. Step 3. On the DAX6O: Connect the meters negative lead to the a
47、mplifier common at Connector T-14. As you locate each DC voltage on the schematic,.note the number of the nearest T terminal in that leg of the circuit and, if possible,take the readings between such a T terminal and T-14. On the DAX120: Connect the meters negative lead to the amplifier common at Co
48、nnector J1-13. As you locate each DC voltage on the schematic, note the number of the nearestJ terminal in that leg of the circuit and, if possi- ble, take the readings between such a J terminal and J1-13. Measuring AC Voltages AC voltages are printed without boxes at various points on the schematic
49、. When measuring these voltages on the amplifier, use an AC meter with a one- megohm impedance and proceed as follows: Page 8 7/87 Step 1.Place the amplifier on a suitable work surface. Disconnect the speak- ers and replace them with a suitable resistive load: DAX6O: The load should have at least a 60-watt power rating and a value of 10.4 ohms across the 25-volt output (or 83.3 ohms across the 70.7-volt output). DAX120: The load should have at least a 120-watt power rating and a value of 5.2 ohms across the 25-volt output or (41.6 ohms across the 70.7-volt output). Step 2. Disco
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