Installation Guide

Replacing the Local Oscillator Module
78-4002497-01 Rev F 37
Replacing the Local Oscillator Module
The AMST faceplate uses a plug-in local oscillator (LO) module to establish the FSK
frequency on which the headend communicates with the tap. This section outlines
the procedure for replacing the LO module in the tap faceplate.
To Replace the LO Module
Follow these steps to replace the LO module.
1 If the faceplate is mounted in the tap housing, remove the faceplate from the
housing as described in Removing the Faceplate (on page 19).
2 Select the appropriate module as specified by the system design. See Tap Part
Numbers (on page 44) for a list of available modules.
3 Locate the local oscillator socket on the tap circuit board (see diagram below).
4 If necessary, carefully remove the existing local oscillator from the socket and set
it aside.
5 Carefully plug the new local oscillator module into the socket. Be sure that all
three pins on the module align with the corresponding holes in the local
oscillator socket.