Australian Monitor Audio Telex ACM250 - Manual (Page 3)

Rear Panel Features
AC Power Inlet
The operating voltage is 230/240 VAC @ 50 Hz or 115 VAC @ 60 Hz (with factory modification). The 3 pin IEC power inlet
is located on the bottom left of the rear panel and accepts a standard mains power lead fitted with an IEC connector.
Before plugging in a power lead, please check the rear panel of the amplifier to ensure that the voltage switch is set
correctly for your part of the world.
The inlet is equipped with an in-built AC fuse holder fitted with a 6 amp fuse plus a spare within the holder. Power
consumption is 400 watts.
---- Please ensure that the mains power cord is disconnected before attempting to check or replace this fuse----
230V/240V Slide Switch
The operating voltage of the amplifier is user selectable between 230V and 240V via a slide switch located on the right
of the AC inlet. This switch should be set to match the AC voltage of your country.
Speaker Output Terminal Strip
The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the amplifier. The
screw terminals on the right hand side are for activation of the in-built 4 tone generator. Reading from left to right the
terminals are:
Low Impedance Common (use with 4 or 8 ohms)
4 Ohms
Spare
Constant Voltage Common (use with 70v or 100v)
70 Volt Line
100 Volt Line
Spare
Tone Generator Common (use with one of the 4 tones listed below)
Pre-Announce Chime
Alert Tone
Bell Chime
Evacuation Tone
Note: The minimum impedance (or maximum load) at 100 Volt line should be no less than 40 Ohms.
Power Switch
This switch controls the switching of AC power to the amplifier. A blue On LED will indicate whether the amplifier is
switched on or off.
Protect LED
A feature of the ACM250 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 off again. This switching on and switching off is 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 the company who supplied or installed the equipment.