AUDIO TELEX ACM250P User manual

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Audio Telex Communications Pty Ltd
ACN 00134S82 lncorporated in NSW
NSW & ACT
149 Beaconsfield Street
Private Bag 149
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Australia
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Fax [phone]il

ACM250P Power Amplifier
Product Description
The ACM250P is a 250 watt power amplifier with outputs for 4 ohms, 70 and 100 volt line. It may be desk or rack mounted but
comes standard as self standing with rubber feet. The ACM250P features a flat screwdriver accessible gain control on the rear panel.
The factory setting for the front panel gain control is I volt RMS.
Front Panel
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POWef BUttOn: This switch controls the switching of AC power to the amplifier. Rocking this switch turns the AC power to the
amplifrer on and off. When in the on position, the red neon in the body of the switch will glow.
Protect LED: A feature of the ACM250P is high temperature protection. In most applications, the internal cooling fan will most
probably never switch on. When used with demanding speaker loads or in difficult operating environments, the fan may regularly
switch on to cool the amp down and then switch offagain. This switching on and switching offis quite normal. The "Protect" function
is there to protect the amplifier from a high temperature problems which would only occur if the fan stopped working or became
clogged up. In this very rare occurance, the amplifier will shut down and the protect LED will illuminate. The amplifier will
automatically restart once it's internal temperature has fallen within "safe" limits. If the protect LED illuminates, it is best to switch
the amplifier off, let it cool down and then try it again. If the protect LED illuminates again, please contact either Audio Telex or the
company who supplied or installed the equipment.
Rear Panel
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3 Pin IEC Mains Power lnlet The operating voltage is 240 VAC @ 50 Hz or I l0 VAC @ 60 Hz (special order). The AC
power voltage level is not extemally user adjustable but is factory pre-set. The inlet is equipped with an inbuilt AC fuse holder fitted
with a 6 amp fuse plus a spare found within the holder. Power consumption is 400VA. I Please ensure that the mains power
cord is disconnected before attempting to check or replace this fuse.
Direct Output Terminal Strip: These screw terminals allow access to the direct outputs of the amplifier. Reading from
left to right the terminals are-
. Low Impedance Common
. 4 Ohms
I Spare
r Constant Voltage Common
. 70 Volt Line
' 100 Volt Line
TWin DG fuse receptacles: Access the DC fuses is by tuming the cap half a tum counter-clockwise with a screwdriver.
The value of the fuses is 10 Amps slow blow. I Please ensure that the AC power switch is in the 'oI? position and that the
mains power cord is disconnected before attempting to check or replace this fuse.
Signal lnpUt SOCketS: Signal input to the ACM250P is via a 3 pin XLR socket and is rated at lOK Ohms and is active
balanced. The two sockets are provided for bridged in/out connection. Pin connections are Pin l:Earth. Pin 2=Active Positive (+).
Pin 3:Active Negative (-).
Gain COntfOl LeVel: A recessed (screwdriver adjustable) gain control is located on the back panel. Tuming the control
clockwise will increase the output of the ACM250P towards it's maximum output level while turning the control counter-clockwise
will decrease the output level. Adjust this control for the desired output level depending on the level of the input signal (from a mixer
or other signal source). The factory default setting for this control is such that a I volt input will give a 100 volt output.
Fuse Sizes
Mains 240 VAC: 6 Amperes Slow Blow
DC: Z x 10 Amperes Slow Blow
Notes
There are no user adjustable controls inside the amplifier so the cover should only be removed by qualified service personnel. In all
cases the mains power lead should be disconnected before the cover is removed.