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Thread: Need advice fixing Boss Dr.55 drum machine

  1. #36
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    if you feel like replacing the chip is beyond your resources, you can send it to me and i'll replace it for you. i already have an extra chip. PM me if you're interested and we'll hash out the details.

  2. #37
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    DR-55

    Hello! Thank you for your help on this forum. I think the drummer in our band tried running the DR-55 at 12 Volts! This obviously brought the machine down... After this, it only made one sound whether in play or write mode and would not play a pattern... I replaced the 4011 as suggested here and now it plays again! ! Unfortunately it only plays one sound really now though. Also unfortunately, in Write mode... it is the same problem. You can only hear one sound no matter if you are on SD or BD or what not.

    After replacing the 4011 what is the next thing that is recommended to replace?

    Thank you so much!!!!!!

  3. #38
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    Anyone? Looks like I'm in the same position..

  4. #39
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    Quote Originally Posted by Tobynbritt View Post
    I was a bonehead and plugged a 12v adapter into my dr 55 and It seems to be done for. The led blinks a bit when I turn it on but that's all I can get out of it. Would I have any luck replacing the IC's or is this thing shot? I'm fairly new to electronics and the 55's PCB is kinda overwhelming for me. Not really sure how to start and I really don't want to buy a new one. Love this little guy.

    Thanks!
    You HAVE plugged something in to the "output" jack, right?
    The DR-55 only works if there's something plugged in.. open circuit protection..

    Otherwise, it's usually the 4011 chip. Be aware that the DR-55 is "picky" about exactly which type of 4011.
    I had one where a CD4011BE (from Maplins) didn't work, but a CD4011UBE did. One is faster than the other apparently?..

  5. #40
    Senior Member Enzo's Avatar
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    I could be wrong, but I think the difference is the U, which if I recall correctly mean unbuffered outputs. I don't know why that would matter in this unit.

    Really, you should start a new thread for yours so we don't confuse things that were done to the other one. We already seem to have a half dozen different units in the thread.

    And then tell us just what the story is on yours, I don't know what same position means here. You plugged the wrong adaptor in yours and it now just sometimes blinks like the first guy?

    And if someone has a schematic it would be great to post it. My schematic inventory lists having it, but it is buried in my storage unit
    Education is what you're left with after you have forgotten what you have learned.

  6. #41
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    Quote Originally Posted by Enzo View Post
    I could be wrong, but I think the difference is the U, which if I recall correctly mean unbuffered outputs. I don't know why that would matter in this unit.

    Really, you should start a new thread for yours so we don't confuse things that were done to the other one. We already seem to have a half dozen different units in the thread.

    And then tell us just what the story is on yours, I don't know what same position means here. You plugged the wrong adaptor in yours and it now just sometimes blinks like the first guy?

    And if someone has a schematic it would be great to post it. My schematic inventory lists having it, but it is buried in my storage unit
    Ok, will do!

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