Top
Contact Information
Web Site Search
Intercom Repair Request Form
Videos
Navigation
FREE Manuals and Installation Guides
NuTone IK15 & IK25 DoorCom Systems
NuTone Intercom Systems - Service & Repair
NuTone Intercom Problems by Model Number
NuTone Intercom Photo Gallery
Vintage NuTone Intercom Catalogs
Rebuilds & Repairs
NuTone Door Chimes
Donations
M&S Systems (Music & Sound Intercom)

NuTone Intercom Photo Gallery > NuTone Stereo Music Intercom Model SM428 > NuTone SM428 power supply module

NuTone SM428 power supply module

The power supply module is a simple design.  There's just a few capacitors to replace.  The diodes should be checked and replaced if needed.

You can see the large pin connectors on the edge of the circuit board.  These plug into the main board, this was a fairly common method for inter-board connections during the late 70's and early 80's.  Today this would be done with a flat-flex cable.