REDBACK
A 4075-85
Page 4
BL2074
Distributed by Altronic Distributors Pty. Ltd. Perth. Western Australia.
Phone: 1300 780 999 Fax: 1300 790 999 Internet: www.altronics.com.au
POWER OUTPUTS
A 4075:
...........................125 watts RMS
A 4085:
...........................250 watts RMS
Distortion:
......................< 0.5%, @ 1kHz
Output line:
...........70V, 100V or 4 - 16Ω
Line output:
...........600Ω balanced, 0dBV
FREQUENCY RESPONSE
Mic inputs:
...............50Hz - 12kHz, -3dB
Line inputs:
..............50Hz - 15kHz, -3dB
SENSITIVITY
Mic inputs:
........................3mV balanced
Line inputs:
............................100mV-1V
SIGNAL TO NOISE RATIO
Mic inputs:
....> 75dB below rated output
Line inputs:
...> 81dB below rated output
OUTPUT CONNECTORS
Speakers:
......................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 limiting, overtemp
Power Supply:
..........240V AC or 24V DC
FUSE PROTECTION
A 4075:
...........................5A AC , 10A DC
A 4085:
........................7.5A AC , 20A DC
Switched 24VDC
1A Internal (both models)
DIMENSIONS
All models:
............≈483W x 330D x 88H
WEIGHT
A 4075:
.......................................≈14.5kg
A 4085:
.......................................≈19.5kg
Colour:
............................................Black
*Specifications subject to change without notice
Important Note:
This product warranty covers a period of ten years after the date of manufacture. In the unlikely event that the amplifier develops a
fault condition do not attempt to repair the unit. Return it to an authorised service agent or our own service department for repair,
along with proof of purchase.
Our contact details are, Phone:
1300 780 999, Fax :
1300 790 999
I
NSTALLING THE TONE GENERATOR
A 2073:
1.
Remove lid from unit
2.
Unscrew tone generator plate from rear panel
3.
Locate tone generator 10 way header on board
(this is located at the rear of the main board)
4.
Connect ribbon cable header to the 10 way header
on the rear board of mixer (see fig 2).
5.
The tone generator is held in by way of 2 screws
(supplied) through the rear panel (via the same
holes that the tone generator plate was attached).
6.
Refit lid and secure with screws.
NOTE:
Tones are operated by closing contacts and
remain operating whilst contacts are closed. The
A 2073 assumes priority 2 when installed
Viewed from the front.
To “remote volume”
terminal on amplifier
rear panel.
500 to 1k
potentiometer.
Figure 3 :
Remote volume connection. Remove link
from remote volume terminals and connect 500
Ω
-
1K potentiometer.
Maximum distance from amplifier: 100m
T
ROUBLE
S
HOOTING
If the
REDBACK Phase 4
amplifier fails to deliver the rated performance,
check the following:
No Power, No Lights
Make sure amplifier power switch is on. Make sure mains power switch is
on at the wall. Check the mains and DC fuse. Replace with only the cor-
rect type and rating. Over rated fuses with invalidate warranty.
Distorted Output
Check that the speaker type is correct for the output that you are using (ie.
4-16
Ω
, 70V or 100V line). Check for any short circuits on the speaker line.
Very Low Output Volume
Make sure that the input is the correct level (check for shorted connectors).
Check for any short circuits on the speaker line.
Check input DIP switches are set correctly.
Check if signal LED
on the front 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, rat-
ings 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 the rear is functioning correctly. Check also speaker types, ratings
and for any short circuits on the speaker line.
No Output Volume
Check the Send/Return link is in place. Ensure the input selector dip switch
is configured correctly for each corresponding input.
Ensure remote volume terminals are linked when no remote volume poten-
tiometer is connected.
When connected, check remote volume control is not turned down.
No Switched 24V DC
Check output switch for correct setting.
Check fuse located on rear PCB is not blown.
S
PECIFICATIONS
