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

 

Latest post 09-10-2009 8:06 AM by Dillen. 1 replies.
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  • 09-10-2009 6:17 AM

    BM6000: replacing idle current trimmers

    Hi all,

    My friend's beomaster 6000 suffers from the usual old age problem of getting too hot.

    I will replace and readjust the idle current trimmers for him, and I'd like to ask, before I begin, a couple of questions just to be sure:

    -The idle current trimpots are R234 and R134 on page 5-1 of the service manual, right (called no-load current trimpots)? Whistle

    -Anything else, besides capacitors, that should be replaced and readjusted while I'm in there (the offset output amp trimpots perhaps, see also 5-1 of service manual)?

    -Are there any 'traps' I might fall in to (what's the English sentence), things that can go wrong and make trouble even worse?

    Any advice, comments or good BM6000 stories are greatly appreciated!Wink

    Laughing

  • 09-10-2009 8:06 AM In reply to

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

    Re: BM6000: replacing idle current trimmers

    I have lots of BM6000 stories, also some from owners trying their own luck with amplifier repairs ...  Whistle

    Yes, replace the DC offset trimmers too. And all electrolytic capacitors, one pitfall could be that
    some of them are bipolar (why not grab a kit).
    Check also for cracked solder joints, especially at connectors and driver transistors.

    Martin

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