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Latest post 06-02-2011 5:07 AM by DrDimitris. 12 replies.
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  • 05-29-2011 5:19 AM

    Repairing a Beolit 707

    On the other day, i spotted a nice Beolit 707 on the auction site. I won and waited for the nice classic item to come to my hands. The seller stated that the radio was fully working. After some days it was there. Cosmetically as described (in a very very good condition i must say). Unfortunately when it came to my hands, the radio was not working and you could hear things broken inside. I decided to make a go and try to fix it. So i thought i make a small photostory for this on the workbench.

    The first finding were the 2 plastic things and a small green metal plate 2,5cm X 1,5cm that were broken.

     

    -Dimitris

  • 05-29-2011 5:36 AM In reply to

    Re: Repairing a Beolit 707

    With the help of my father and a multimeter we tried to find out were the problems were located and we did locate several. Broken main pc board, broken ferrite core grips, broken solders and worst of all broken circuit board! The last one is inside a hard metal protective casing and to find it broken at that time made me furious because the seller had lied to me. There was no possibility for this to happen during the transfer. I was furious with the seller, reluctant for the result of my work, but i wanted to try. Soldering iron, patience, screwdrivers and of course the multimeter.  

     

    Here is the hard metal protective casing where the circuit board is housed.

    -Dimitris

  • 05-29-2011 6:35 AM In reply to

    • Dillen
    • Top 10 Contributor
    • Joined on 02-14-2007
    • Copenhagen / Denmark
    • Posts 5,008
    • Founder

    Re: Repairing a Beolit 707

    It is indeed possible for the power supply circuit board to break in transport.
    It carries a fairly heavy transformer and has no decent support itself.
    Sometimes the transformer is knocked lose from the board.
    Check also the solder joints of the regulator transistor. That's the one with
    the long metal cooling blade. Its solder joints being its only support.

    The broken ferrite antenna holders is also very common, even the ferrite
    rod itself can break. It will all glue fine back together.
    The ferrite rod will work fine even if breaks are superglued in several places since
    it works magnetically rather than electrically.

    Some radios have small covers over windows at the bottom of the radio, like over the
    serial number etc. Maybe that's where that colored plastic thingy comes from.

    Martin

  • 05-29-2011 5:50 PM In reply to

    Re: Repairing a Beolit 707

    Thank you Dillen for your valuable input. First i glued with silicon glue the left end and secured with <<safety strip>> the right end of the ferrite core. 

     

     

    -Dimitris

  • 05-30-2011 7:48 AM In reply to

    Re: Repairing a Beolit 707

    And here is the right side:

     

    -Dimitris

  • 05-30-2011 8:02 AM In reply to

    Re: Repairing a Beolit 707

    And here is a more panoramic view:

    -Dimitris

  • 05-30-2011 8:08 AM In reply to

    Re: Repairing a Beolit 707

    Resoldering of the broken pc board solder:

    Another plastic piece broken, another fix:

    -Dimitris

  • 05-30-2011 8:11 AM In reply to

    Re: Repairing a Beolit 707

    The broken power circuit board needed some more work…..

     

     

    -Dimitris

  • 05-30-2011 8:22 AM In reply to

    Re: Repairing a Beolit 707

    Finally all was fixed, the system was up and running again and i can enjoy it. It is a real classic radio! I love it. Hope this photo thread might be helpful to some. Smile

    -Dimitris

  • 05-30-2011 10:13 AM In reply to

    Re: Repairing a Beolit 707

    Thanks for posting, Dimitris Smile

    I have one in the exact same colour!

    -mika

  • 06-01-2011 5:45 PM In reply to

    • Dillen
    • Top 10 Contributor
    • Joined on 02-14-2007
    • Copenhagen / Denmark
    • Posts 5,008
    • Founder

    Re: Repairing a Beolit 707

    Nice work indeed !  Yes -  thumbs up
    And thanks for the photos. We like photos.

    You may want to strengthen the board at the breaks with a
    little 2-comp. epoxy or similar to avoid eventual shorts and/or more damage.

    Martin

  • 06-01-2011 10:18 PM In reply to

    • Rich
    • Top 50 Contributor
      Male
    • Joined on 07-10-2010
    • Orlando, Florida, USA
    • Posts 1,089
    • Gold Member

    Re: Repairing a Beolit 707

    Another steely-eyed missile man.  Well done!

    And great photos.

     

    Current primary listening:  SMMC20EN -> BG4002 -> BM4000 -> Beovox M70

     

  • 06-02-2011 5:07 AM In reply to

    Re: Repairing a Beolit 707

     It is not perfect but it is a workbench thread for sure. Stick out tongue

    Thanks again for your comments and remarks.  Smile

    -Dimitris

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