Cracked circuit board | The Canadian Guitar Forum

Cracked circuit board

Discussion in 'Amp Building/Technical/Repair' started by guitar69freak, Dec 28, 2019.

  1. guitar69freak

    guitar69freak

    Joined:
    Jul 28, 2019
    Location:
    Ottawa
    What is my best option to “plastic weld” this circuit board?
     

    Attached Files:

  2. player99

    player99 Gold Member

    Joined:
    Sep 4, 2019
    Location:
    Ontario
    Plastic epoxy and jumper all traces?
     
  3. cboutilier

    cboutilier

    Joined:
    Jan 12, 2016
    Location:
    Halifax, NS
    You can probably order an unpopulated replacement board fairly cheap
     
  4. greco

    greco Gold Member

    Joined:
    Jul 15, 2007
    Location:
    Kitchener, Ontario
    Is it for this amp?
    The one with the feedback issues?
    [​IMG]
     
  5. guitar69freak

    guitar69freak

    Joined:
    Jul 28, 2019
    Location:
    Ottawa
    Yes I’d just gotten some new caps and I just need to epoxy the circuit board and trace the leads.
     
  6. guitar69freak

    guitar69freak

    Joined:
    Jul 28, 2019
    Location:
    Ottawa
    I plan on using contact cement with something to reinforce it and use lengths of speaker wire to complete the circuit board.

    What would you suggest?
     
  7. oldjoat

    oldjoat

    Joined:
    Apr 4, 2019
    Location:
    lost in time and lost in space RHPS
    5 minute epoxy ( dollar store cheap stuff ) ... then solder jumpers in place with rosin core solder

    use 22 or lighter gauge wire to solder jumpers between the existing mounting holes/ components

    some solid old bell house wire would work fine.
     
    keto likes this.
  8. greco

    greco Gold Member

    Joined:
    Jul 15, 2007
    Location:
    Kitchener, Ontario
    Save up for a new amp. Seriously.

    Convert that amp into an extension cab.
     
    cbg1 likes this.
  9. guitar69freak

    guitar69freak

    Joined:
    Jul 28, 2019
    Location:
    Ottawa
    I’ve decided to use PL Construction for more rigidity, I’ll let you know how that goes tomorrow.
     
  10. Verne

    Verne

    Joined:
    Dec 29, 2018
    Location:
    London, Ontario
    I'd be looking at this as a learning situation. If it won't cost a lot, why not try and fix it and see how you do.
     
    greco and Doug Gifford like this.
  11. Lincoln

    Lincoln Gold Member

    Joined:
    Jun 2, 2008
    Location:
    Fort Saskatchewan, Alberta
    how tall was the building you threw it off of? :D
     
    greco likes this.
  12. oldjoat

    oldjoat

    Joined:
    Apr 4, 2019
    Location:
    lost in time and lost in space RHPS
    PL will stay flexi even after curing ... not a good choice ,
    epoxy is cheap and you can add several layers to build it up ... even add a strip or two of cardboard top and bottom to prevent flex .
    if you ARE looking for a flexi joint , just use a hot glue stick and the cardboard trick ...
     
  13. greco

    greco Gold Member

    Joined:
    Jul 15, 2007
    Location:
    Kitchener, Ontario
    Good idea.

    Good Luck.
     
    Last edited: Dec 28, 2019
  14. oldjoat

    oldjoat

    Joined:
    Apr 4, 2019
    Location:
    lost in time and lost in space RHPS
    errr.... that's why you jumper to the nearest solder joint .:)
    and if any tracks run beside each other , try to twist the insulated repair wires together to avoid them becoming antennas ( like you twist tube heater wires )
     
  15. mhammer

    mhammer

    Joined:
    Nov 30, 2007
    Location:
    Ottawa, Ontario
    The green stuff sprayed on the copper side will not take kindly to any solder. Were it my amp, I would scrape the coating away to reveal bare shiny copper, and use pieces of solid-core wire of sufficient gauge (I suspect #20 at least) to connect the two pieces of the board, once it has been epoxied or otherwise glued back together. For those portions that are wide, use a few pieces of wire to connect the edges. That should provide enough rigidity, in combination with the glue and the board-mounted pots attaching it to the chassis.

    Just out of curiosity, how did it break?
     

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