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1、,$ziiT FAX60 AND FAX120 AMPLIFIERS KI-1466 RAuLAND-BORG CORPORATION ? 3535 West Addison Street, Chicago, Illinois 60 6 18 ( 312) 267-1300 GENERAL DESCRIPTION The Rauland FAX Series amplifiers are designed for years of trouble-free service in a variety of commercial and industrial sound systems. They
2、 may also be installed in a UL-listed enclosure for use in fire-alarm-signaling systems. The FAX amplifiers incorporate many useful features. The input can be set to operate in a BAL (balanced) or UNBAL (unbalanced) mode by a switch on the rear panel. In the balanced mode, it is transformer-isolated
3、. A RESPONSE switch has a LO-CUT position that provides protection for horn-type speakers. The transformer-isolated speaker outputs include 4- and 8-ohm connections as well as constant-voltage 70.7- -and 25-volt connections with a center tap. There is also an auxiliary power output for pre-amps (24V
4、DC, 250 mA maximum). The FAX60 and FAX120 amplifiers can operate from a 24-volt DC power source. 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,
5、immediately place a claim: with the dealer or distributor from whom you purchased the unit or-if the unit was shipped directly to you-with the carrier. 1986 RAULAND-BORG CORPORATION PRINTED IN INDIA 7/86 Page 1 of 10 RadioFans.CN 收音机爱 好者资料库 The following parts are included with the mixer-amplifier:
6、D e s c r i p t i o nQty. 1 Battery Cable 2 Rack-Mounting truss-head 4 Rack-Mounting truss-head 4 #l0 Tinnerman Rauland Part No. with mating connector. Screws for tapped holes (l0-32 x 5/8 black Phillips machine). Screws for untapped holes (10 x 5/8 black Phillips thread-forming). U type Speed Nuts.
7、 WA221 WA222 AB1889 1 Jumper Cable for making special connections among the speaker and ground terminals. INSTALLATION The amplifier should be rack-mounted where there is adequate ventilation, a moderate temperature, an AC power outlet within 4-l/2 feet, and provisions for grounding. The rack should
8、 have the standard 19-inch width and a vertical space of 5-l/4 inches. Adding an inch of space behind the amplifier for connections, the rack should have a total depth of 11-l/2 inches (FAX60) or 15 inches (FAX120). A cooling fan is recommended when the rack is enclosed and: (a) The combined rated o
9、utput 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 ABOVE PRECAUTIBNS COULD RESULT IN OVERHEATING THAT COULD DAMAGE THE EQUIPMENT OR CREAT
10、E A FIRE HAZARD. Rack-Mounting The front panelsof the FAX60 and FAX120 amplifiers are designed to allow the amplifiers to be directly mounted into standard 19-inch racks. Two kinds of mounting screws are supplied with each amplifier: A. If the racks holes are untapped,select the #10 thread-forming s
11、crews (WA222). Push the#l0 U nuts onto the proper holes in the rack. B. If the racks holes are tapped,select the #10 machine screws (WA221). Page 2 7/86 RadioFans.CN 收音机爱 好者资料库 WARNING DO NOT CONNECT AC POWER TO THE AMPLIFIER UNTIL ALL OF THE NECESSARY INPUT AND OUTPUT CONNECTIONS RAVE BEEN COMPLETE
12、D. Grounding Connect the rack frame to the grounding post (the knurled knob marked “GROUND). CAUTION DO NOT DISCONNECT THE THIRD WIRE ON THE POWER PLUG. THIS WIRE GROUNDS TEE AMPLIFIERS CHASSIS TO PREVENT A POSSIBLE SHOCK HAZARD. IF AN ADAPTER IS USED TO CONNECT THE PLUG TO A TWO-PRONG SOCKET, MAKE
13、SURE THAT THE AMPLIFIERS CHASSIS IS CONNECTED TO A PROVEN EARTH GROUND. INPUT CONNECTIONS (Note: The back-panel inputs are illustrated at the end of the manual, on the page following the specifications.) The input can be switched to a balanced or unbalanced mode. representation of the input terminal
14、s below and adopt one of the combinations of wiring and switch position: Refer to the following two (b) connectBalanced input: (a) Placethe switch in the BAL position and the signal wires to the two end (BAL) terminals and the shield to the common (COM) terminal. Unbalanced input: (a) Placethe switc
15、h in the UNBAL position and (b) connect the signal wires to the left (UNBAL) (COM) terminal. BAL(+) COM BAL(-) I I I 1 UNBAL COM terminal and the center Note: “BAL(+)” and UNBAL designate the same terminal. Route the input cables from the right side (as viewed from the back of the amplifier) to prev
16、ent any coupling from the speaker cables on the left. 7/86 Page 3 SPEAKER CONNECTIONS The first two subsectionsapply to both amplifiers. However, their output taps differ significantly: onthe FAX60, to CT (Center Tap), but, on COM (Common) is internally connected the FAX120,COM is connected to a 25V
17、 terminal instead. Hence, the output connections of the two amplifiers are given in separate subsections. Note: The back-panel outputs are illustrated after the Specifications. Routing the Wires Route the speaker wires from the left side (as viewed from the rear of the amplifier). This will prevent
18、coupling with the input lines on the right. Selecting the Proper Outputs The 4- and 8-ohm outputs are generally used when the wires running to the speakers are relatively short and the line loss is less than 0.5dB (most audio and sound-system handbooks have tables listing the line loss for each wire
19、 size and load impedance). For best performance, make sure that the impedance of the total speaker load matches that of the tap being used. Use series or parallel speaker arrangements as needed to obtain the proper impedance-matching. The 25- and 70.7-volt outputs are for speakers designed for const
20、ant- voltage lines. Each speaker must have a line-matching transformer, 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 from the line. Speakers can be added as required until the total wattage
21、 absorbed by all of the transformers is equal to the rated power output of the amplifier. It is good practice to allow an amplifier a headroom of 10% to 20%. For a 120-watt amplifier, -the maximum speaker load should be approximately 100 watts. FAX60 Speaker Connections The speaker taps on the outpu
22、t transformer of the FAX60 (internal details) are illustrated below, in KMO759. On the next page is a table detailing the connections (see also the Outputs Availabletables in the Specifications). KM0759 M Note: The transformer Center Tap terminal and the Common terminal are wired together internally
23、 on the FAX60. Page 4 7/86 Use X8 spade lugs to attach the speaker wires to the amplifiers terminals. The following table summarizes the proper speaker connections to the FAX60: OUTPUT DESIRED AMPLIFIER CONNECTIONS 70.7v balanced Both 70.7v taps.* 70.7v unbalanced Both 70.7v taps; jumper from - left
24、 70.7v to GROUND.* 25v balanced Both 25v taps.* 25v unbalanced Both 25v taps, jumper from - left 25v to GROUND.* 4 ohms 8 ohms 4 and COM.* “8” and “COM. * * Install the supplied jumper between GROUND and COM with these connections only if balanced and grounded operation is desired. * DO NOT INSTALL
25、A JUMPER BETWEEN GROUND AND COM WITH TEE UNBGCED 70.7-VOLT AND 25-VOLT CONNECTIONS: IT WOULD CREATE A SHORT CIRCUIT ACROSS THE OUTPUT TRANSFORMER. * Install the supplied jumper between GROUND and COM with these connections for unbalanced and grounded operation (the standard configuration for 4- and
26、8-ohm outputs). FAX120 Speaker Connections The speaker taps on the output transformer of the FAX120 (internal details) are illustrated below, in KM0764. On the next page is a table detailing the connections (see also the Outputs Availabletables in the Specifications). Note: The transformer Center Ta
27、p terminal and the Common terminal are not wired together on the FAXl20. 7/86 Page 5 Use #8 spade lugs to attach the speaker wires to the amplifiers terminals. The following table summarizes the proper speaker connections to the FAXl20: OUTPUT DESIRED AMPLIFIER CONNECTIONS 70.7v balanced Both 70.7v
28、taps.* 70.7v unbalanced Both 70.7v taps; jumper from left 70.7v to GROUND.* 25v balanced Both 25v taps.* 25v unbalanced - Both 25v taps, jumper from left 25v to GROUND.* 4 ohms 4 and COM.* 8 ohms 8 and COM* * Install the supplied jumper between GROUND and CT with these connections only if balanced a
29、nd grounded operation is desired. * DO NOT INSTALL A JUMPER BETWEEN GROUND AND CT WITH THE UNBGCED 70.7-VOLT AND 25-VOLT CONNECTIONS: IT WOULD CREATE A SHORT CIRCUIT ACROSS THE OUTPUT TRANSFORMER. * Install the supplied jumper between GROUND and COM with these connections for unbalanced and grounded
30、 operation (the standard configuration for 4- and 8-ohm outputs). Auxiliary Power Supply The 24-VDC power supply on the screw terminals can provide a maximum of 250 mA to preamplifiers and other auxiliary devices requiring DC power. POWER CONNECTIONS AC Connection Plug the power cord into a 120-V, 6
31、0-Hz.,three-wire grounded outlet that can provide 220 watts (FAX60) or 320 watts (FAX120) of power. Check the local regulations before installing permanent AC lines and plugging in the equipment. DC Connection The amplifier can be powered by an external battery or other 24-VDC source. Normally, this
32、 is used as a backup source. A cable with a polarized plug is supplied to facilitate the connection of DC power. Note: The amplifier will not recharge the batteries. For recharging, obtain an approved charger and follow the manufacturers instructions. Page 6 7/86 USING THE CONTROLS, SWITCHES, AND LE
33、D INDICATORS INPUT LEVEL Control This control on the back panel is used to adjust the sound output to an appropriate level. It should be set so that the maximum possible input signal will not cause the output to clip. This control should be adjusted by the installer and then left alone. RESPONSE (Lo
34、w-Frequency Roll-Off) Switch Use the FLAT position of theRESPONSE switch to obtain the rated frequen- cy response of the amplifier. To protect horn-only speaker systems, place the switch in the LO-CUT position:this will cause at least a l0-dB roll-off at 100 Hertz. LEDs and Circuit Breakers When the
35、 amplifier is operating normally, the POWER LED glows. Should an overload or a short circuit occur in the speaker lines, the DC circuit breaker will trip. To signal this condition, the POWER LED will turn off and the PROTECTION MONITOR LED will light up. Should the AC fuse blow, both LEDs will be of
36、f. If either of these conditions occurs ascertain what the problem is and correct it before resetting the circuit breaker or inserting a new fuse. The resetting is done by pushing the stem of the circuit breaker back in. Should the circuit breaker trip repeatedly, unplug the power cord and consult a
37、 qualified service representative. INITIAL TROUBLESHOOTING Problem Possible Causes 1) 2) Low volume or distorted sound. (a) (b) The amplifier does (a) not operate and the Power LED does not light up. (b) Check whether all the input and output connections are properly made andsecurely fastened. If th
38、e sound is distorted, check whether the speak- ers are being overdriven (e.g., does the distortion go away when the level control is turned down?). Make sure that the power cord is plugged in and that there is power in the outlet. Examine the input and output lines for obvious shorts (among themselv
39、es and between them and the chassis or surrounding equipment) and broken con- nections. If everything appears in order, check the fuse. If the amplifiers output and POWER LED lights still fail to respond,unplug the power cord and contact your local RAULAND distributor. 7/86 Page 7 SERVICING INFORMAT
40、ION I THE INFORMATION THAT FOLLOWS IS INTENDED FOR QUALIFIED SERVICE TECHNICIANS. Conversion to 240-VAC Operation Step 1. Remove the two top and the two rear screws fastaning thetop cover to the amplifier cabinet, then take off the top cover by slidingit backwards. Step 2. Locate the 12OV/24OV switc
41、h (inthe middle of the chassis) and place it in the 240V position. Then replacethe top cover. Step 3. Replace the fuse with a slow-blow or 2.5 A (FAX120). fuse that is rated at 1.5 A (FAX60) Step 4. Replace the plug on the AC power cord with one of equivalent quality that will mate with the power ou
42、tlets at the installation site. Gaining Access to the Components If the unit is rack-mounted, first remove it from the rack (see the Rack Mounting instructions above). To remove the top cover, remove the two screws on top and the two holding the cover on the back, and slide the cover off. This will
43、provide may be removed in desired. access to all of the internal components. The bottom cover similar fashion, if access to the bottom of the chassis is Testing Voltages To pinpoint adefective component,refer to the nominal voltages for the amplifier that are marked on its schematic diagram. Removin
44、g 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: (1) (2) (3) Transistors can be damaged by excessive heat
45、, so use a small soldering iron when removing or replacing a transistor with solder connections. Transistors come with a wide variety of cases and leads. To avoid a costly mistake, make a careful sketch of the lead connections before removing a transistor from a printed circuit board or tie points.
46、Before installing a power transistor, obtain an appropriate mica insulator, coat both sides of it with silicone grease (Dow-Corning DC4 or an equiva- lent), and fit the insulator between the transistor and the heat sink. An alternate insulator is a Silpad , which does not require silicone grease. P
47、a g e 8 7/86 Testing Transistors The best way to test a tranaistor is to use a transistor tester. However, if one is not available, use an ohmmeter. Most failures result in a short or an open circuit between the collector and the emitter. Connect the ohmmeters leads to the collector and the emitter, then use the low ohm range to read the resistance, If the reading in this range remains the same when the leads art reversed, the transistor is shorted. If the readings art infinite for both connections, the transistor is open.
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