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Simple amp repair question

Discussion in 'Amps and Cabs [BG]' started by SubtePass, Nov 22, 2018.


  1. SubtePass

    SubtePass

    Nov 22, 2018
    Hi all, I'm not really much into electronics and stuff, hope you can help me with what I think is a simple question:
    So, long story short, a guy I knew kicked my bass amp furiously and tried to rip it apart, doesn't matter why (but it's kinda a funny story that I might tell you in the future).
    The thing is: from what I can see, it looks like he didn't touch any of the electronics, everything seems in place, except for the power plug. That was ripped right out of place, and there's no marks on the electronics to where it might have been connected.
    I don't really know much about this, I'm guessing it's just a matter of soldering the live and neutral cables to where they belong. All I need to know is... where do they belong :p
    I'm attaching here some pictures (and I can attach as many as you need), do you have any ideas?

    Thanks!
    IMG_0431.JPG IMG_0416.JPG IMG_0417.JPG IMG_0418.JPG IMG_0427.JPG IMG_0428.JPG IMG_0429.JPG IMG_0431.JPG
     
  2. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Thevyeo yellow wires are the primary BUT, they are incorrectly wired as it sits.

    Also, your speaker is thoroughly damaged.
     
    MrLenny1 and Aqualung60 like this.
  3. SubtePass

    SubtePass

    Nov 22, 2018
    Yes, it's quite old, it has lots of marks and scratches, but it was working perfectly before this incident.
    How do you mean incorrectly wired? How are they supposed to be?
    And do you have any clues as to where should I attach the live and ground wire?

    Thanks!
     
  4. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Both primary wires don't go to the power switch, one should go through fuse first. Might not be as simple as it looks.

    Your speaker's surround has come apart.
     
    Rock Salad likes this.
  5. SubtePass

    SubtePass

    Nov 22, 2018
    But they were like this for as long as I have it, if there isn't a fuse now, there wasn't one before either, how can that be?
     
  6. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    Without knowing more, there's no way to know.

    It's a cheap amp, cheap and safe do not often go hand in hand.
     
    dan1952 and gepettus like this.
  7. SubtePass

    SubtePass

    Nov 22, 2018
    That's true for sure, I bought this amp used a couple of years ago, and it was quite cheap. Sadly, it isn't anymore, it's way too expensive for me to change it now (even if it is for one like this, less alone for a better one), that's why I was hoping it would be simple to fix it.

    Anyway, thanks for your input!
     
  8. Raf Seibert

    Raf Seibert

    Dec 16, 2013
    Texas
    Aged Horse’s advice is gold standard. He’s not telling you how to put it back like it was, he’s telling you how to make it right.
     
  9. SubtePass

    SubtePass

    Nov 22, 2018
    Yeah, I know, and I really appreciate that... I just can't get a new one now, so I guess it will go to the trash and I will get reeeeally close to the strings and try to mute everything around me :p
     
  10. If you want it repaired take it to a tech and let him/her sort it out for you. Everything that @agedhorse has posted is 100% correct.
     
    dan1952 likes this.
  11. JimChjones

    JimChjones

    Aug 6, 2017
    SE England
    Man, looks as if that baby has had a hard life. Is that a transformer only held on with one screw? I think if its going to be safe to use it again then it really needs to be gone over thoroughly by a trained amp specialist and tested for electrical safety. Who knows what ripping the cables out may have done to other stuff. Soldered connections don't usually pull off without doing bad things to what they are soldered to. All sorts of nasty things are possible.
     
  12. SubtePass

    SubtePass

    Nov 22, 2018
    No, no, it's being held by two screws but it was unscrewed and loose on the latter pictures. But yeah, you guys are right, I know, I just didn't wanna face that :)
     
  13. alembicguy

    alembicguy I operate the worlds largest heavey equipment Supporting Member

    Jan 28, 2007
    Minnesota
    I'm not really into electronics and stuff.................... you should probably find someone who is. Safely repairing it is the way to go. Even a cheap piece of electronic equipment can cause harm to someone who knows nothing about repair.
     
    BazzaBass likes this.
  14. mmbongo

    mmbongo Five Time World Champion Supporting Member

    Aug 5, 2009
    Carolinas
    Burning down your house or electrocuting yourself is not worth trying to save a few bucks.
     
    pcake, BazzaBass, Artman and 2 others like this.
  15. SubtePass

    SubtePass

    Nov 22, 2018
    Unless I have a good insurance :p

    Got it, guys, don't worry, I'm not gonna touch anything, I either take it to a pro, or throw it in the trash ;)

    Thanks!
     
    BazzaBass and Skillet like this.
  16. Sorry for your problem, I bet it's one hell of a story.

    I would either pitch it or pay to have a professional make it right, only you can decide what's right for you.

    I certainly don't mean this in a demeaning way, but I am always astounded that guys who know nothing about electronics (and that CERTAINLY includes me, believe me) are willing to reach around inside a chassis with who knows what kind of voltage running around and think they can fix it, when in reality they are placing themselves in possibly mortal danger. NOTHING is worth that. You can always get another amp, but we can't get another you !
     
    BazzaBass likes this.
  17. beans-on-toast

    beans-on-toast Supporting Member

    Aug 7, 2008
    I'd remove the moth.

    The gold colored heatsink looks twisted. I'd check the solder connections to that component. Also ensure that nothing is touching it.
     
  18. SubtePass

    SubtePass

    Nov 22, 2018
    I'm not taking it in a bad way at all :)
    I know the basics of electronics, I've done some arduino projects and fiddle around with components (which don't handle high voltage), and yet I've always took every bit of precaution I can, but I thought it would've been easier to say I know nothing so I get instructions suitable for a novice, I think that's the best way to avoid doing a mess. Of course, if I were to try to fix it myself, I would've been extra cautious, but you're all right that I shouldn't attempt that in the first place. It's not worth it.
     
  19. SubtePass

    SubtePass

    Nov 22, 2018
    Thanks! But yeah, I'm gonna leave it to a pro, and not touch anything myself :)
     
    beans-on-toast likes this.
  20. agedhorse

    agedhorse SUSPENDED Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa, Product Support-Genz Benz
    It's probably not worth the cost of repairing safely. That's one of the unfortunate challenges of cheaply built gear.
     
    AudioTaper, BazzaBass and Jeff Scott like this.

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