NuTone door chime problems

Discussion in 'Remodel Forum & Blog' started by chassis, Jan 11, 2012.

  1. chassis

    chassis Engineer

    Joined:
    Sep 12, 2005
    Occupation:
    Engineer
    Location:
    SE Pennsylvania
    Hello guys, here's another one for you.

    I have an old (like most stuff in the house I live in) NuTone musical door chime. It is electronic and you can select several different songs. It has a speaker like you would find in a radio or stereo. It is a two button (two door) chime. It is fed from a Rittenhouse RT34 transformer attached to the electric panel in the basement.

    The chime started making a very loud humming/buzzing sound, coming from the speaker of the chime.

    The noise occurs when both door buttons are disconnected. The noise stops when I cut power to the circuit with the circuit breaker, and when I disconnect the DC wire in the chime itself.

    The question is, how do I determine if the transformer is bad, or the electronic chime is bad? Thanks.
     
  2. DonL

    DonL Jack of all trades Master of one

    Joined:
    Mar 30, 2011
    Occupation:
    Rocket Scientist
    Location:
    Houston, TX

    It sounds like maybe a open Capacitor or a shorted audio driver or rectifier.

    The transformers usually open, and just go dead. Sounds like it is making power.

    What is the model number ?
     
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  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    The power to the doorbell switches and the chime itself is 24vac coming from the transformer, not a DC voltage. With an electronic chime, internally it will take that ac and make dc to run the circuits. Sounds like the amplifier in the chime is going bad. Probably easiest to just replace the thing.

    Note, I had an electronic one for awhile, but its internal circuity would pick up my neighbor's ham radio transmissions just like I was sitting in the room with him...very annoying. I swapped it out for a simple ding/dong non-electronic one.
     
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