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NuTone Intercom Photo Gallery > NuTone Stereo Music Intercom Model SM428 > NuTone SM428 switch side of main board

NuTone SM428 switch side of main board

The Main Board has all of the Room Control Switches  and the Selector Switch mounted directly to the circuit board.  These are higher quality "non-shorting" switches and they usually don't have any problems.  A simple and light cleaning is all they typically need.  These switches are no longer available, so care should be taken when cleaning them.