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NuTone Intercom Photo Gallery > NuTone Stereo Music Intercom Model SM428 > NuTone SM428 stereo multiplex board

NuTone SM428 stereo multiplex board

The Stereo Multiplex board requires just 2 capacitors that need to be replaced.  There are 2 adjustments that should not be changed unless the board i snot operating correctly.

These adjustments should only be made by following the instructions in the service manual.

The Multiplex IC can be a source of problems in some cases, while it is still possible to find this IC, it is no longer an inexpensive part.