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John, Engineer and electronic enthusiast for more than 12 years.
Category: Consumer Electronics
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My Nutone 3303 intercom stopped working, and wont go into

Customer Question

My Nutone 3303 intercom stopped working, and won't go into test mode. Front panel buttons light up. Need electronics expert help!
Submitted: 8 years ago.
Category: Consumer Electronics
Expert:  Livep9 replied 8 years ago.




HelloCustomerthe problem is one of your transformers is not working,and needs to be


replaced,or it could be a defective board after a couple hours of usage but not


likely,have an electrican check the transformer and see what he says.



Thank you.

Customer: replied 8 years ago.
The transformers seems to be fine, at 17.5 volts. If there is a problem in the main board, I would like to diagnose and fix it, which is the goal of my posting. Let me know if you can assist.