AUDIO TELEX ACM250P Bedienungsanleitung

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Audio Telex Communications Pty Ltd

ACN 00134S82 lncorporated in NSW

NSW & ACT

149 Beaconsfield Street

Private Bag 149

Silverwater NSW 2128

Australia

Ph 02 96/.71411

FaxO2 9648 3698

42 CommercialRoad

PO Box 871

Fortitude Valley QLD 4006

Ph 07 38521312

Fax 07 32521237

221277 Middleborough Road

Box HillVlC 3128

PO Box 151

Blackburn South VIC 3130

Ph 03 98907477

Fax 03 9890 7977

299 Fitzgerald Street

West Perth WA 6005

PO Box 404

North Perth WA 6906

Ph 08 9228 4222

Fax 08 9228 4233

Electronic Concepts Pty Ltd

76 George Street

Thebarton SA 5031

PO Box 7034 Hutt Street

Adelaide SA 5000

Ph 08 82349444

Fax 08 823494/.1

K W McCulloch Pty Ltd

54a Albert Road

MoonahTAS 7009

Ph 03 62286373

Fax 03 6278 1063

Unit B, 11 Piermark Drive

PO Box 512

Albany NZ 1331

Ph 09 4159426

Fax 09 415 98il

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.

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