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ARCHIVED FORUM -- April 2007 to March 2012

This is the first Archived Forum which was active between 17th April 2007 and 1st March February 2012


Latest post 11-13-2011 2:34 AM by Dillen. 1 replies.
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  • 11-12-2011 5:21 PM

    Beomaster 8000 type 1905

    Hi this is my first post.

    I am currently repairing a Beomaster 8000, the original fault being that the power amplifier would not switch on, the relaysnot clicking into operation.  This was traced to dry joints on through hole joints in the computer module.

    Having repaired this, I have faults in the preamplifier in which it would appear that all three switching IC's have failed. For instance when TP1 is selected there is signal on R206 where it connects to the preset pot but nothing on the end of R206.

    Similarly there is signal (FM and TP2) on one end of R223 and R224 but not where it connects to the IC's.

    I have checked the relevant supplies and they are present and correct.

    The IC's are AD10/278 & AD10/192

    It seems that these IC's are no longer available.  Ihave found an equivalent for AD10/192 but cant find an equivalent for AD10/278.  The best I can do is to build two submodules to take new 4 channel chips.

    Has anyone any idea as to why these IC's have failed?

    Does anyone know where I can get replacements or doI fit the ones from RS with some modifications?

    Thank you









  • 11-13-2011 2:34 AM In reply to

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

    Re: Beomaster 8000 type 1905

    Welcome to Beoworld !

    Clean those preset pots first.
    They can cause lots of faults, both intermittent and more permanent.
    Check also that all cables are correctly seated and in their correct sockets.


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