1
Installation Instructions
Noise Reduction Module
Model A125
Description
The 3M A125 Noise Reduction board (3M part number 78-9236-6453-2) improves the inbound intelligibility of
an intercom system by reducing environmental background noise from vehicles, airplanes, noisy intersections,
wind, etc.
System Requirements
The 3M A125 Noise Reduction Module requires a C921BA Base Station.
Installing the Noise Reduction board into the C960 Base Station
1. Remove the right-hand and left-hand top covers from the C921BA base station. Be careful that the C921BA
circuit board does not fall out of the plastic base.
2.
Plug the A125 ribbon cable onto connector J8, located at the top of the left side of the circuit board. Be
careful to support the rear side of the base station circuit board when plugging in the A125 ribbon cable.
3.
Position the holes near the edge of the A125 circuit board over the plastic standoffs on the base station.
4.
Attach the left-hand base station cover after configuring the A125 board, and performing the Final Checkout
Procedure.
Install the A125 board here
Figure 1. Mounting the A125 to the C921BA Base Station
To Next Page
Loading...
Need help?
General
