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NuTone Intercom Photo Gallery > NuTone Stereo Music Intercom Model SM428 > NuTone SM428 circuit boards

NuTone SM428 circuit boards

The SM428 has a smart and easy to service design.  There are individual circuit board modules which plug into a main or "mother" board.  

The boards are:

Red Arrow:  Main Power Supply Module

Blue Arrow:  Stereo Multiplex Module

Yellow Arrow: Intercom and Stereo Pre-Amp Module

Green Arrows:  Right and Left Channel Amplifier Modules