AUDIO TELEX AT120-3 Operating Instructions

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ATI 2O-3 Mixer Amplifier Product Description Th9 AT60 is a 60 $€tt mixer amplifier and similarly the ATl20 is a l2o *ztt mixer amplifier. Both models operate on 240 VAC, 50 Hz (or I l0 VAC with factory modificauon) and may be desk or rack mounted via an optional rack mount kit. Both amplifie6 incorporate a 6 zone 100 volt line sfraker zone selector with all call. The A,T60 will deliver 60 watts into a load of g otrms, ZO or 100 volt line. The AT120 will deliver 120 watts into a load of .l or 8 ohms. 70 or 100 volt line. As standard both models are self standing and come with rubber feet. They may be stacked to a maximum of four units high. Front Panel Controls t. Dual llicrophone/Line Gain Controls: The + duat mic/line inpur controls are labelled ch I through ro Ch 4 and should be adjusted to provide the rcquired mix levet for each individual channel. Start with the controls set to level 0 and turn the controls clockwise until the desircd mix level for each channel is reached" Bass Tonal Control: Sening this contml in the cente position will give an overall flat bass response !o the output of the amplifier' Adjusting the bass control in a clockwise direction will provide up ro 12 dB of bass boo tt q rco ut. Adjusting the bass control in a counter-clockwise direction will provide up to -12 dB of bass o,tr @ loo Hz. Treble Tonal Control: Setting this control in the centre position will give an overall flat treble response to the output of the amplifier. Adjusting &e Feble control in a clockwise direction will provide up to lo dB of rebt; boosr g touiy. Adjusting the treble control in a counter-clockwise direction will provide up to -lO dB of treble cut @ lO l'l]|z. aster Output Control: This controls the overall output level of the arnplifier depending on the levels set for the individual iryut mir channels as detailed above. Start with the control s€t to level 0 and tum clockwise until the d€sired output level of the amplifier is reached All Call Button: When pressed, this orange button wilt connect the 100 volt output of rhe amplifier to all 6 of the switched outFrts of the amplifier. Depressing this button again will disconnect the switcha ofiputs. fnis swiah is ,.push on- push of' and is non-interlocking. Speaker Selector Switches: Thes€ 6 black buttons are for swirching rhe 100 volr output of the amplifier to any combination of fte 6 available speaker zones. The switches are'push on-push off'and are non-interlocking (boi6 with eacir other and with the all-call button). The maximum capacity of each slBaker zone is 60 watts so care should be taken to ensure that no individual zone is loaded down with any morc than 60 watts, always remembering that the total load for the AT60 is 60 watts in total and for the ATl20, 120 watts in total. Eg; It is pnssible on the ATl20, for example, to safely have one zone loaded with 60 watts and the remaining five loaded with l2 wans each. 3. 4. 5. Ar 1 20 EuDionirft

integral to the inbuilt protection included in the amplifier. This LED will glow red if the amplifier is operating into an excessive load or ifone or mor€ of the input channels is supplving an unacceptably high level ofsignal. It is normal for this LED to flicker on and off howwer. if it glows steaqt^ . the amplifier will shul down for a period of approximately 3 seconds and continue to cycle in this fashion until the abnormal connection is removed or rectified. This is a featue of the amplifier designed to protect the amplifier circuitry ald the speaken connected to the output. Powef Button: ThiE switch controls the swilching of AC power to the amplifier. Rocking this switch upwards turns on AC power to the amplifier while rockhg the switch downwards turns power off to the amplifier. When in the upard positio4 the red neon in the body of the switch will glow. Rear Panel Connections t. 3 Pin IEC ilains Power Inlet: the operating voltage is 240 VAC @ 50Hz or lloVAC@60H2. The AC power voltage level is not extemally user adjustable but is factory pre-set. The intet is equippea with an inhilt AC fus€ holder fitted with a 4 amp ftse (ATl20) or a 2 amp fuse (AT60) plus a spare for each found within the holder. Fower conslmption is 225VA for the ATl20 and l25VA for the 4T60. * Please ensure that the mains prower cord is dhconnected before attempting to ch€ck or r€place this fuse. z. Direct Output Terminal Strip: fnese screw terminals allow access to the direct outpurs of rhe amplifier. 2 spare screw terminals allow for the connection ofvarious tone module accessories. Reading from left to right the terminals are- o Low Impedance Common o 4 Ohms (Not aYailable on AT60) .8Ohms . Constant Voltage Common . T0 Volt Line . l@ Volt Line o Spare o Spare Note: The minimum impedance at any time on maximum load for 100 Volt line shoutd be no less than E0 Ohrns for the AT120 and no less than 170 Ohns for the 4T60. 3. Switched Outputs Terminal Strip: neaalng from left to right these screw terminal pairs correspond to the switched 100 volt line outputs numbercd 6 through I as indicated on the front panel of the rmplifier. For each pat, the left hand terminal is the common and the right hand terminal is the 100 volt output Tape Output: RCA style phono output connector for line level output. Provides a maximum of 350mV into 10K Ohms, ideal for a connection to most standard tape recorders. This outFut is sourced before the master gain control and as such, the tape output level is not inlluenced by the operation of the master gain control. 4. 'r I,1r'1'r po1'ori i-i -r_-T r - @@@@o

200 ohms. Pin connections are: pin #l-earth; pin #2-active (high, +)t pin #3-active (low, -). Phantom fnwer of +15 volts is available on all microphone inputs. Reading from left to right across the rear panel, the connection are for microphone inputs 4, 3,2,&lrespectively. 6. RCA Sockets For The Monaural Line Level lnputs. Inputs #'s 1,2 & 3 llave an input sensitivity of 75mV @ 47K ohns. Input l'4 has an inp.rt sensitivity of 250 mY @ 4TK ohms making it suitable for high level inpuls such as a CD player. Reading from left to right across the rear panel, the connections are for inputs 4, 3, 2, & 1 respectively. Optional Accessories I The installation of some of the following optional acc$sories involves access to the inside of the amplilier. Installation should only be attempted by a qualified technician. Always turn olf the AC power and remove the AC power cord before attempting to rccess th€ inside of the amplifier. Please contact your near$t Audio Telex ofiice for details of your nearest qualified technician. Tone Genefators: Four separale tones are available as an option \/ia the ATC5488 tone gpnerator board. This intemally mounred PCB is €asily fitted and plugs dircctly into a socket provided on the intemal circuit board PCB6I9E. Please follow the inslructions supplied with the tone generator. When any tone from the ATC5488 is acti ted all inputs will automatically mute except for input one. Tones available on the ATC5488 tone generator board are: Evacuation Tone (to Australian Standard L5222O.1.2) Alert Tone (to Australian Standard A52220.1.2) Bell Tone Pre Announce Chime TX3010 Vox tuting Module. When installed (as per the comprehensive instructions supplied with the fi3010), channel I of the ampl.ifier will mute channels 2, 3 & 4 of the amplifier. ATR KBLK. 19" rack mount kit Fuse Sizes ATI 20 Amplifier tains 240 VAC: 4 Ampercs Slow Blow Fuse Sizes AT60 Amplifier tains 240 VAC: z Ampres Slow Blow Notes The DC fts€ is located on the circuit board. This is a feature of the AT series amplifien, which is equip,ped with a cwrenr limiting circuit preventing excessive DC currents, thus eliminating the risk of blowing high lension fuses. In the unlikely event that the DC fuse actuates, the output transistors should be checkd as it is probable thar the amplifier has been subjected to very extreme conditions-