User manual AUDIO TELEX ACM2151

[. . . ] The ACM2I50 has outputs for 100 volt line or 4 - 8 ohms and has an active balanced input of lOK ohms. The ACM2I50 will operate llom 240 VAC @ 50 Hz or ll0 VAC @ 60 Hz (not user selectable, internal factory adjustment only, specifo at the time of ordering). [. . . ] The ACM2I50 also features auto-sensing fan cooling and over temperature protection. The maximum recommended load for the ACM2l50 is 65 ohms per channel for 100 volt line operation and 4 ohms per channel for low impedance operation. Front Panel Controls OUtpUt Level: The input level controls are unlabelled, recessed (screwdriver adjustable) and are located in the centre of the front panel. Turning a control clockwise will increase the output of the particular channel of the ACM2I50 towards it's maximum output level while turning the control counter-clockwise will decrease the output level. Adjust this conkol for the desired output level depending on the level of the input signal (from a mixer or other sigrral source). The factory default setting for this control is I volt input will supply full load into 4 ohms. POWef SWitCh: The rocker switch located in the front centre of the panel turns AC power on to the ACM2I50. Rocking *CH B" LED's will glow the power switch to the right to turns the AC power 'on'. When the AC power is 'on', the "CH A" and in the amplifier status display window. Cooling Fans (Air lntake): tre cooling fan is temperature sensitive and will only switch on when the temperature of the ACM2151 had reached a pre-determined range. Before adjustir this switch in any way please make sure that the AC power switch is in the "off'position. Any selection made is common both channels and they cannot be selected independently of each other. To select an output oi 100 volts RMS (100 volt lir or high impedance) move the switch to the left position when looking directly at the iear of the amplifier. To select r output of 4-8 ohms (low impedance) move the switch to the right position whar looking directly at the rear of the amplifie Selector Switch: Output Terminal Strip: Reading from left to right these connections are as follows: Positive connection for channel B output Negative connection for channel B output Spare Spare Positive connection for channel A output Negative connection for channel A output Note: These outputs (channels A & B) cannot be selected or wired for bridged mode mono operation. 4. DC Fuse Access the DC fuses by turning the caps half a turn counte clockwise with a screwdriver. The value of the fuses is 5 Amps slow blow. Please ensure in"t tn" AC power switch is i Low Voltage Receptacles: the 'off fuses. position and that the mains power cord is disconnected before attempting to check o" ""pla"" any of ther lnput (& Parallel Output) XLR Signal Connections: The inputs (A active balanced @ lOK ohms. The pin configuration of all sockets is as follows: pin #l-earth pn #2-active (high, +); pi ; #3-active (low, -). [. . . ] The pin configuration of all sockets is as follows: pin #l-earth pn #2-active (high, +); pi ; #3-active (low, -). The output socket is to allow the original input signal to be fed on to another amplifier. [. . . ]