Transformer for battery charger

Discussion in 'Electronic Repair' started by WbSearch, Sep 21, 2003.

  1. WbSearch

    WbSearch Guest

    Have a Ryobi charger, M/N CTH1202, which the 120 volt side of the transformer
    is open, no obvious broken wires or overheating. Anyway the following is
    stamped on the transformer: ES-66-287-1245. Does anyone have any idea where I
    can get a replacement transformer? Ryobi doeasn't service individual partsd
    for the charger. Thanks in advance.
     
    WbSearch, Sep 21, 2003
    #1
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  2. WbSearch

    John Todd Guest

    On 21 Sep 2003 14:53:07 GMT, WbSearch <> wrote:
    >Have a Ryobi charger, M/N CTH1202, which the 120 volt side of the transformer
    >is open, no obvious broken wires or overheating. Anyway the following is
    >stamped on the transformer: ES-66-287-1245. Does anyone have any idea where I
    >can get a replacement transformer? Ryobi doeasn't service individual partsd
    >for the charger. Thanks in advance.


    Have you opened it up? Often the fine primary wire parts close
    to where it connects to the outside world. Also some transformers
    have thermal disconnects inside the paper wrapping.



    --
    _______________________________________
    John E. Todd <>

    Note: Ensure correct polarity prior to connection.
     
    John Todd, Sep 21, 2003
    #2
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  3. WbSearch

    Bill Janssen Guest

    WbSearch wrote:

    > Have a Ryobi charger, M/N CTH1202, which the 120 volt side of the transformer
    > is open, no obvious broken wires or overheating. Anyway the following is
    > stamped on the transformer: ES-66-287-1245. Does anyone have any idea where I
    > can get a replacement transformer? Ryobi doeasn't service individual partsd
    > for the charger. Thanks in advance.


    My charger went shorted on the primary. I just ordered a new charger
    as the price was right and rebuilding would be too difficult.

    Good luck on finding parts, I tried that and gave up.

    Bill K7NOM
     
    Bill Janssen, Sep 21, 2003
    #3
  4. WbSearch

    WbSearch Guest

    I did open the wrapping to check if the wires came off the terminals. Don't
    see anything wrong. Wires are connected so I assume the break is internal.
     
    WbSearch, Sep 21, 2003
    #4
  5. WbSearch

    mike Guest

    WbSearch wrote:
    > I did open the wrapping to check if the wires came off the terminals. Don't
    > see anything wrong. Wires are connected so I assume the break is internal.


    Another place they put the thermal fuse is against the core, inside the
    winding bobbin. or molded into a plastic bobbin.
    mike

    --
    Bunch of stuff For Sale and Wanted at the link below.
    laptops and parts Test Equipment
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    Tektronix Concept Books, spot welding head...
    http://www.geocities.com/SiliconValley/Monitor/4710/
     
    mike, Sep 21, 2003
    #5
  6. WbSearch

    WbSearch Guest

    Thanks, didn't see any fuse except the 1 amp on the mains input-which didn't
    blow.
     
    WbSearch, Sep 21, 2003
    #6
  7. WbSearch

    SHIMON Guest

    (WbSearch) wrote in message news:<>...
    > Have a Ryobi charger, M/N CTH1202, which the 120 volt side of the transformer
    > is open, no obvious broken wires or overheating. Anyway the following is
    > stamped on the transformer: ES-66-287-1245. Does anyone have any idea where I
    > can get a replacement transformer? Ryobi doeasn't service individual partsd
    > for the charger. Thanks in advance.



    answer: most of the times the termal fuse that inside the transformer
    blow. to replace it you have gently and carfuly remove the paper on the primery
    side of the transformer (120 [v] side) and will found it replace it white the
    rating of temperature.
    in other cases the resson is a semiconductur such as diode tra' etc.
     
    SHIMON, Sep 21, 2003
    #7
  8. WbSearch

    Bill Janssen Guest

    WbSearch wrote:

    > Thanks, didn't see any fuse except the 1 amp on the mains input-which didn't
    > blow.


    My unit had two fuses. One was soldered in and looks like a resistor. It
    was on the transformer.

    Bill K7NOM
     
    Bill Janssen, Sep 21, 2003
    #8
  9. WbSearch

    WbSearch Guest

    Will take a much closer look, thanks.
     
    WbSearch, Sep 21, 2003
    #9
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