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  1. #1
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    Faulty volume on Audi HU's?

    Browsing on ebay and found these guys who repair the design flaw which will eventually effect all Concert head units:
    http://cgi.ebay.co.uk/Faulty-Blaupun...dZp1638Q2em124
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  3. #2
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    they suffer from faults including

    VOLUME CONTROL FAULTY
    UNABLE TO TURN VOLUME DOWN
    SOUND OUTPUT STUCK ON FULL VOLUME
    Aren't they kind of the same thing? Or at least the first one covers the other two!
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  4. #3
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    They're all caused by the same design flaw, but are different symptoms.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
    Alex Turner

  5. #4
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    95 seems mighty expensive to me
    the parts would likely be in the region of pence not pounds
    ive repaired a lot of amplifiers and they dont cost that much to repair
    if you know what your doing
    all the symptoms have exactly the same result

    im sure this is something very simple such as the lead from the volume control going into the op-amp being broken
    this will effectively make the op-amps go to full volume instantly and the outputs will follow suit
    Last edited by dualmono21; 9th May 2008 at 22:08.
    2003 pearlescent black s4 avant tiptronic - milltek exhaust - pre cats removed - remapped ...
    koni adjustable suspension front and rear
    alpine f1 dvi9990 -pxah990 headunit and processor - alpine d511r
    4 x focal 5ws midbass drivers - focal audiom 6w midrange - focal tce tweeters - velodyne df 12 sc servo controlled subwoofer
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  6. #5
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    Its a chip failiure, but i do not know which one. A brand new unit can be had for 99

  7. #6
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    Quote Originally Posted by dualmono21 View Post
    im sure this is something very simple such as the lead from the volume control going into the op-amp being broken
    this will effectively make the op-amps go to full volume instantly and the outputs will follow suit
    It's not actually simple at all, it requires a new microcontroller chip (MC68HC05 - the most expensive part of the entire HU), and reprogramming of the chip to prevent the issue happening again, so not really a DIY job.
    http://www.erta.ru/review/chorus-problem_eng.shtml

    Yes you can get a whole new HU for that money on ebay but it will eventually develop the exact same fault, which happens after 10,000 adjustments of the volume/bass/treble/fader etc on all models of the same design.
    Last edited by AndyMac; 10th May 2008 at 13:25.
    "How to tear apart the ties that bind, perhaps fcuk off might be too kind"
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  8. #7
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    sneaky *******s purposefully designing a head unit that is already flawed
    i was right with the volume control to op-amp though the chip is simply in the middle of these two

    i thought about this for years thinking how easy it would be to design a system which simply goes kapput after a pre-determined length of time or usage
    i wonder how many household items are exactly the same as this ????
    2003 pearlescent black s4 avant tiptronic - milltek exhaust - pre cats removed - remapped ...
    koni adjustable suspension front and rear
    alpine f1 dvi9990 -pxah990 headunit and processor - alpine d511r
    4 x focal 5ws midbass drivers - focal audiom 6w midrange - focal tce tweeters - velodyne df 12 sc servo controlled subwoofer
    3 x phoenix gold zpa 0.5 amplifiers

  9. #8
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    Quote Originally Posted by dualmono21 View Post
    i was right with the volume control to op-amp though the chip is simply in the middle of these two
    Err, you weren't right! A) Its not the lead and B) its not simple!

    Quote Originally Posted by dualmono21 View Post
    i thought about this for years thinking how easy it would be to design a system which simply goes kapput after a pre-determined length of time or usage i wonder how many household items are exactly the same as this ????
    Someone beaten you to it years ago... They're called Microsoft!

  10. #9
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    so it isnt a direct connection i got that bit wrong
    the end result is the same its in between the volume control and the op- amp so i got that bit right

    as for simple that really depends on if you know how to change a chip or not
    2003 pearlescent black s4 avant tiptronic - milltek exhaust - pre cats removed - remapped ...
    koni adjustable suspension front and rear
    alpine f1 dvi9990 -pxah990 headunit and processor - alpine d511r
    4 x focal 5ws midbass drivers - focal audiom 6w midrange - focal tce tweeters - velodyne df 12 sc servo controlled subwoofer
    3 x phoenix gold zpa 0.5 amplifiers

 

 

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