Atronic A 4275 Operating Manual Download

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www.altronics.com.au

User manual revision number: 1.5 29/08/16

Operating Manual

A 4275 125W Mixer Amplifier

A 4285 250W Mixer Amplifier

Redback® Proudly Made In Australia

Distributed by Altronic Distributors Pty. Ltd.

Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au

IMPORTANT NOTE:

Please read these instructions carefully from front to back prior to installation.

They include important setup instructions.

Failure to follow these instructions may prevent the amplifier from working as designed.

Optional Extras

A 2280B

Remote Volume

A 2711

MP3 Module

A 4573

Alert/Evac Board

D 2111

Keyboard USB/PS2

Summary of Contents for A 4275

Page 1: ...s Pty Ltd Phone 1300 780 999 Fax 1300 790 999 Internet www altronics com au IMPORTANT NOTE Please read these instructions carefully from front to back prior to installation They include important setup instructions Failure to follow these instructions may prevent the amplifier from working as designed Optional Extras A 2280B Remote Volume A 2711 MP3 Module A 4573 Alert Evac Board D 2111 Keyboard U...

Page 2: ...g of commercial audio equipment in the mid 70 s we have always taken pride in producing a quality local product The new adoption of the Australian Made logo will help us get the word out to local and export markets that our products carry the official compliance seal of the Australian Made campaign We have always pushed our local is better line in all of our marketing efforts it s always an added ...

Page 3: ...0 1 10 Label the input sources service information and setting up min and max volumes 11 2 0 Setup 2 1 Setup Guide 12 2 2 Priorities 13 2 3 DIP Switch Settings 14 2 4 Adjusting VOX levels 15 2 5 Installing the A 4573 Alert Evac Module 16 2 6 PTT and 24V DC Switched Out 17 2 7 Remote Volume Control 18 2 8 Preamp Out Tape Out Send and Return 19 2 9 Backup battery charging 19 2 10 Fitting the optiona...

Page 4: ...rd interface for labelling of inputs and installer contact details 6 inputs configurable as balanced microphone or line Music Input on front panel Adjustable line level sensitivity 70V 100V and 4 16ohm outputs 240V AC or 24V DC operation 300mA Backup Battery charging Phantom power on microphone inputs Tape out Dual RCA Pre amp send and return connections RCA Balanced line output 3 pin male XLR Rem...

Page 5: ...al features see section 1 10 for more details 6 On Indicator This led indicates the unit has power 7 Fault Indicator This led indicates when the amplifier has a fault 8 Master Volume Use this control to adjust the master volume This is a mutli turn adjustable control 9 Bass and Treble Controls Use these controls to adjust the bass and treble 10 Music Input Use this input to connect a portable musi...

Page 6: ...power fail Send Return Tape Out Preamp Out Link To Charge Backup battery Input 1 Input 3 Input 2 Input 4 Input 5 Input 6 ALERT EVAC MODULE Output Levels Voice Chime Alert Over Evac EV COM CAN CH AL Triggers L R Rem Vol Connect to 1KΩ Pot Line 24V DC Switched Output DIP 5 Interface DIP 4 DIP 1 DIP 2 DIP 3 Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Bala...

Page 7: ...d to produce a mono input signal 8 DIP SW 1 3 Inputs 1 6 include an individual 4 way dip switch enabling adjustable input sensitivity 100mV or 1V and Priority VOX muting for inputs 1 3 Priority VOX muting is not available on inputs 4 6 Note when the Priority VOX muting function is selected inputs 1 3 it will operate with the input set for either microphone or line operation see section 2 3 for DIP...

Page 8: ...kΩ 1 25W 3 76kΩ 8kΩ 2W 2 35kΩ 5kΩ 2 5W 1 88kΩ 4kΩ 3W 1 56kΩ 3 3kΩ 5W 940Ω 2kΩ 7 5W 626Ω 1 3kΩ 10W 470Ω 1kΩ 15W 313Ω 666Ω 20W 235Ω 500Ω 30W 156Ω 333Ω 40W 117Ω 250Ω 60W 78Ω 166Ω 100W 47Ω 100Ω 125W 37Ω 80Ω 250W 19Ω 40Ω 500W 9 4Ω 20Ω 15 24VDC IN Battery Backup Provision has been provided to run the amplifier from a suitably rated 24V battery system in the event of a mains failure Using appropriately r...

Page 9: ...een designed with an in built protection mode which will throttle the amplifer back to 50 output if it nears the shutdown temperature If the Protect Mode is active the amplifier LCD will flash ON and OFF to highlight that there is a problem with the amplifier The fault condition will be displayed on the screen see section 1 for more details 1 8 LCD STATUS INDICATORS The LCD is used to offer more d...

Page 10: ... 1 INPUT 2 1 INPUT 3 1 INPUT 4 1 INPUT 5 1 INPUT 6 H SINK TEMP 1 2 3 30 4 5 6 7 8 9 10 11 12 13 14 15 16 CURRENT LIMIT EMERG TONES PROTECT MODE 7 Voltage Limit Indicator If the amplifier goes into an over voltage status this indicator will come on see section 1 6 for more details 8 VU Meter Displays the output of the amplifier in 5dB increments 9 VU Level Displays the actual dB output of the ampli...

Page 11: ...eturn Press escape to exit back to the main label input screen 3 Label the Service Information Press the letter s on the keyboard This will navigate the user to the label Zone screen Type in the label required and press return Press escape to exit back to the main label input screen 4 Reset all Labels Press the letter r on the keyboard This will navigate the user to the reset all labels screen Pre...

Page 12: ...see section 2 3 for DIP switch settings 4 16Ω 70V 100V OUTPUTS L R 24V DC IN Balanced Mic _ PTT short to activate Power Fail Contacts close on power fail Send Return Tape Out Preamp Out Link To Charge Backup battery Input 1 Input 3 Input 2 Input 4 Input 5 Input 6 ALERT EVAC MODULE Output Levels Voice Chime Alert Over Evac EV COM CAN CH AL Triggers L R Rem Vol Connect to 1KΩ Pot Line 24V DC Switche...

Page 13: ...M CAN CH AL Triggers L R Rem Vol Connect to 1KΩ Pot Line 24V DC Switched Output DIP 5 Interface DIP 4 DIP 1 DIP 2 DIP 3 Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Line L R L R L R L R L 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 1 2 3 4 5 6 7 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 230V AC 50Hz www altronics com au RESETTABLE DC FUSE Made in Austral...

Page 14: ... Line inputs Switch 2 Not Used Switch 3 Not Used Switch 4 Sets Input 5 sensitivity to either 1V or 100mV This affects both the Balanced Mic and Line inputs Input 1 When VOX is enabled on input 1 it will override all other inputs including the optional A 4573 alert evac module Input 2 When VOX is enabled on input 2 it will override inputs 3 to 6 Input 3 When VOX is enabled on input 3 it will overri...

Page 15: ... 4 Sets the phantom power 15V DC for input 5 Switch 5 Sets the phantom power 15V DC for input 4 Switch 6 Sets the phantom power 15V DC for input 3 Switch 7 Sets the phantom power 15V DC for input 2 Switch 8 Sets the phantom power 15V DC for input 1 2 4 Adjusting VOX levels The VOX sensitivity levels for inputs 1 3 sensitivity can all be adjusted via trimpots accessed through the front panel DIP4 S...

Page 16: ...by way of 2 screws supplied through the rear panel via the same holes that the tone generator cover plate was attached 6 Refit lid and secure with screws NOTE Tones are operated by closing contacts and remain operating whilst contacts are closed Fig 2 5B shows the volume controls and the triggers 1 Voice Over Volume Use this trimpot adjustment to change the output level of the playback message 2 C...

Page 17: ...L R L R L R 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 1 2 3 4 5 6 7 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 230V AC 50Hz www altronics com au RESETTABLE DC FUSE Made in Australia by Altronic Distributors Pty Ltd DIP 5 DIP 4 IMPORTANT NOTE Ensure power is switched OFF when adjusting DIP switches New settings will be effective when power is switched back on DIP 3 SW Item On Off 1 2 Input 6 Level 1V 100mV ...

Page 18: ...hown below would be suitable The maximum distance from the amplifier the potentiometer can be connected is 100 metres Fig 2 7 shows a typical connection Altronics A 2280B Wallplate fitted with 1KΩ Potentiometer Fig 2 7 DIP 5 DIP 4 24V DC IN _ PTT short to activate Power Fail Contacts close on power fail Send Return Tape Out Preamp Out Link To Charge Backup battery ALERT EVAC MODULE Output Levels V...

Page 19: ...t Line 24V DC Switched Output DIP 5 Interface DIP 4 DIP 1 DIP 2 DIP 3 Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Mic Line Balanced Line L R L R L R L R L 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 2 1 3 1 2 3 4 5 6 7 8 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 230V AC 50Hz www altronics com au RESETTABLE DC FUSE Made in Australia by Altronic Distributors Pty Ltd DIP 5 DIP 4 IM...

Page 20: ... lid and secure with screws Once fitted if music is playing from this module it will over ride the rear input 6 The output level is adjusted via the volume 6 control on the front of the amplifier NOTE If a music source is connected to the Music input on the front of the amplifier it will override this MP3 Module and the rear input 6 source A 2711 Specifications A 2711 Pinouts Output level 500mV 80...

Page 21: ...USB and SD Pressing this key over 3 seconds will power off the module When the module is in the OFF state pressing this key will power on the module POWER Power off the module STOP When in PLAY PAUSE mode pressing the stop key the will stop the player and shows TOC MODE When this key is pressed shortly the module mode will change between USB CARD and FM 10 Pressing this key will skip forward 10 MP...

Page 22: ...panel is lit to indicate there is signal If it is not lit there is no signal present Continually Blows Fuses Make sure that the speaker line is not shorted Check speaker types ratings and if on correct output Amplifier Keeps on Cutting In Out Make sure that there is adequate ventilation around the amplifier Check the vent slots on the front top and sides are not covered or blocked and the fan on t...

Page 23: ...rs Screw terminals Line out 3 pin XLR INPUT CONNECTORS Inputs 3 pin XLR balanced or 2 x RCA 24V DC power Screw terminals 240V AC power IEC power connector Muting PTT via microphone switch contacts or VOX muting inputs 1 3 CONTROLS Mic inputs Volume Line inputs Volume Bass 10dB 100Hz Treble 10dB 10kHz Master Volume Power On off switch Indicators Power fault VU meter signal present output peak limit...

Page 24: ... Sat 9 00am 4 00pm Melbourne Vic 891 Princes Hwy SPRINGVALE VIC 3171 Open Mon Fri 8 30am 5 30pm Sat 9 00am 5 00pm Sun 10 00am 4 00pm Perth WA 174 Roe St PERTH WA 6000 Open Mon Wed Fri 8 00am 5 30pm Thur 8 00am 8 00pm Sat 8 30am 5 00pm Sun 12 00pm 5 00pm Virginia SA ND GA TE RO AD MCDONALDS ROBINSON RD EA PRITCHARD ROAD VAUXHALL ST Br is ba ne G PO 17 km Brisbane Qld Unit 2 1870 Sandgate Rd VIRGINI...

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