Transformer 13.5v X 2 issue

Discussion in 'Electronics Repair' started by Johnson007, Oct 12, 2017.

  1. Johnson007

    Johnson007

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    Hii guys,
    I have a sound system.It worked only for 8 months.You can guess where it was made :D .
    Lets look into the issue.
    There was no power light.So my first guess was the power supply , so i checked the input & output of transformer.
    The input was fine (230v) but the output was (1v).So i think the transformer is the culprit.
    This transformer is 13.5-0-13.5 /2.5A .You can look into the image.
    I tried different online & offline shops to get a replace but the only transformer that i could get close to was 12-0-12 2A & 18-0-18 2A
    Will going with 18-0-18 2A do fine or will it create a heating issue? I am just a hobbyist so i am not sure.
    Thanks!
     

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    Johnson007, Oct 12, 2017
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  2. Johnson007

    davenn Moderator

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    Hi
    welcome to EP

    It will produce too much voltage that will damage components in the rest of the system

    You mite get away with the 12-0-12 one but you need higher current, 2A isn't enough considering the original
    one was 2.5A and probably died by being run to its limit
     
    davenn, Oct 12, 2017
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  3. Johnson007

    davenn Moderator

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    yeah, cuz it will have been custom made for that gear


    Ohhh meant to comment

    it's probably the input winding of the transformer ( the primary) that has failed

    you would only be measuring the voltage on the terminals, but if you disconnected from power
    and measured the resistance of the primary, you will likely find that it is open circuit

    MOST transformers these days have a thermal fuse hidden under the plastic tape
    and you will most probably find it has blown



    those with electronics skills can get to the thermal fuse and replace it and have a working transformer again
     
    davenn, Oct 12, 2017
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  4. Johnson007

    Johnson007

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    Yup its open circuit..Didn't knew about thermal fuse.Thanks for the info Davenn...I am not a pro in soldering :D so will try to replace the transformer by 12-0-12 3A.
    Thanks once again.
     
    Johnson007, Oct 12, 2017
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