I need a schematic diagram or other information for a NuTone Model 2067-68. Home is equipped with non-working intercom. No paperwork came with the house.

I purchased a home with intercom installed. Nothing works. Very quiet hum on master unit. I suspect a problem in the power supply. Before I tear it apart, I'd like to have a schematic diagram, or at least a wiring diagram. Any diagrams available on line? PDF? Any paperwork (Hard Copy?, Photo Copy?) via snail-mail? I Have no idea how old it is. It is Solid State. Thanks. Ken, W9ZMR

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