REDBACK
A 4075-85
Page 3
BL2074
Figure 1 :
This is a view of the
Mixer PCB (front board) as you
would view it inside the amplifier.
Note:
Only channel 2 & 3 VOX lev-
els are provided inside the amplifier.
Channel 1 VOX level is located on
the rear panel.
Alert/Evac
Level
CH2 Vox
Level
CH3 Vox
Level
Metal Shield
Rela
y
A 2073 header
24VDC Out
Fuse 1A
Figure 2 :
This is a view of the Rear PCB as
you would view it inside the amplifier.
It shows the location of the header for the
A 2073 alert/evac tone module
240V AC
N816
AC Fuse
L
R
Mic 5
Aux 5
DIP 5
L
R
Mic 4
Aux 4
DIP 4
L
R
Mic 3
Aux 3
DIP 3
L
R
Mic 2
Aux 2
DIP 2
L
R
Mic 1
Aux 1
DIP 1
L
R
Mic 6
Aux 6
DIP 6
Send
Return
Preamp Out
Tape Out
DIP 7
L
R
Input 1
Vox Level
Voice
Over
Chime
Alert /
Evac
Al
Ev
Ch
Gnd
Can
24V DC In
+
-
Link to
charge
backup
battery.
4-16
Ω
70V
100V
Remote
Vol.
PTT
24VDC
Switched Out
DC
Fuse
*
†
* Remote Vol. : Link must be fitted when remote volume option is not installed.
† Send/Return RCA: Link must be fitted unless effects unit is used.
A 4075-85 Rear Panel Layout
TABLE
1: DIP SWITCH
SETTINGS
Input Switches 1-3
Switch
Item
On
Off
1
Input Type
Line
Mic
2
Line Level
1V
100mV
3
Priority
On
Off
4
Phan. Pwr
On
Off
Input Switches 4-6
Switch
Item
On
Off
1
Input Type
Line
Mic
2
Line Level
1V
100mV
3
-
-
-
4
Phan. Pwr
On
Off
Output Switch
Switch Item
On
Off
1
Switched 24VDC Out
Off
On
2
-
-
-
3
Preout Pre Master Volume
On
Off
4
Preout Post Master Volume
On
Off
IMPORTANT
NOTE:
Switches 3 & 4 not to be set to On simultaneously.
All switches are factory set to Off position.
Installer to configure to installation requirements.
