Service manual

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3. Installation
Figure 3. Basic connection diagram
3.2 Circuit location.
The NEDSP1061-KBD module is inserted into the path
of noisy audio. Using the input and output level controls
allows the unit to appear transparent to the audio signal.
NEDSP1061 Power ampPre amp
Audio outAudio source
Audio out
Pre amp Power amp
Place NEDSP1061-KBD module
in place of the coupling
capacitor
Audio source
NEDSP1061
Remove this
Capacitor
Figure 4. NEDSP1061-KBD Audio path
3.1 Introduction.
Before commencing installation study the equipment’s
service manual/circuit diagram thoroughly to familiarise
yourself with the circuit diagram and disassembly
procedure.
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For optimum performance provide the module with a
constant amplitude signal, for example before the volume
control.
Power Amp
Loudspeaker
Volume
Control
Pre-amp
Remove this
Coupling Capacitor
NEDSP1061
Audio In
(Red)
Audio Out
(Blue)
Place the NEDSP1061
In place of the
Coupling capacitor
Black
(Screen)
Figure 5. NEDSP1061-KBD recommended position.
Note:
On some modern receivers/transceivers the volume
control is digital and doesn’t operate in the audio
path.Contact the manufacturer for advise for the most
suitable postion for theDSP module..
3.3 Fitting.
After locating a suitable location for the module in the
circuit, refer to the service manual for diassembly
information.
3.3.1 Audio connections.
Carefully remove the chosen coupling capacitor, taking
care to not damage the PCB pads. Solder the blue wire
from the screened lead to the power amp side of the
capacitor and the red to the other.
The black wire should be connected to a convenient 0V