GK 1001RB II amp repair - help!

Discussion in 'Amps and Cabs [BG]' started by chowderhead1962, Jun 3, 2019.

  1. chowderhead1962

    chowderhead1962

    Apr 28, 2013
    Hi I have a GK 1001RB 2 that had the input jack break off. I bought a replacement for it, and unsoldered the holes, popped the new jack in, and resoldered it. I then connected all the connectors back onto the board and fired it up. But all I hear is a hiss and if I bring the volume up it then makes a big hum sound. I'm not really sure what I did wrong. Any ideas? Did I fry the board?

    thx
    David
     
  2. joel406

    joel406 Inactive

    Dec 27, 2013
    Florida
    Sounds like you shorted something somewhere. Best take it to a qualified tech to sort it out. Don’t risk any further issues.
     
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  3. BogeyBass

    BogeyBass Inactive

    Sep 14, 2010
    Could be a broken trace on the board from the mishap.

    Check closely for small breaks or cracks
    And need to scrape away the solder mask and build a bridge if a trace is broken.
     
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  4. arbiterusa

    arbiterusa

    Sep 24, 2015
    SoCal
    Tech time.
     
    Aqualung60 likes this.
  5. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Tech time, and hopefully you haven't turned a $50 repair into a much larger repair from what you did.
     
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  6. Jim C

    Jim C I believe in the trilogy; Fender, Stingray, + G&L Supporting Member

    Nov 29, 2008
    Bethesda, MD
    There are not any shops in my area that would perform this repair for less than $125.
    OTOH, the damage could be greater than that number.
     
  7. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    Without repairing the additional damage, that's a 1 hour repair tops for a qualified tech. Say if it even $75, that would generally be a lot less than going in and mopping up additional damage.
     
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  8. Warpeg

    Warpeg

    Jun 20, 2005
    Ohio
    Did you test your new jack and new solder joints for continuity on the board? If so, and it still doesn’t work, then get it to a tech.
     
  9. chowderhead1962

    chowderhead1962

    Apr 28, 2013
    I did not test that no. Does that just involve touching the solder joint with one lead on a voltmeter and then jack itself with the other?
     
  10. chowderhead1962

    chowderhead1962

    Apr 28, 2013
    The other really dumb thing I did was not "mark" the tweeter and woofer leads that go from the circuit board to the front board. So I'm not entirely clear whether I had the facing forward or backward. I tried them both ways, but nothing changed.
     
  11. BassmanPaul

    BassmanPaul Inactive

    Even more reason to take the unit to a qualified Tech.
     
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  12. Post some pics if you're not going to take it in for repair. jack, solder, anything you touched or replaced.
     
  13. Kro

    Kro

    May 7, 2003
    New Jersey
    When you say facing forward and backward, what do you mean?

    These are the guys you're talking about, right? I seemed to remember them being notched so that they could only be inserted the "right" way, but maybe I'm mistaken. IMG_20170817_130259080.jpg
     
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  14. chowderhead1962

    chowderhead1962

    Apr 28, 2013
    Yes those are the leads, but it is the other end (the board that has all the inputs) that I forgot to mark. They can be inserted onto the two prong leads in either direction. I thought I had put them on correctly, but in either case it didn't work either way. I'll post some photos of the boards in a little bit.
     
  15. Thumpin6string

    Thumpin6string Supporting Member

    Apr 25, 2013
    Shoals Indiana
    It's a goner, I'll give you $100 for it.:D
     
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  16. Kro

    Kro

    May 7, 2003
    New Jersey
    My memory is that they were a similar style... but I also only ever detached them from the power amp board. :unsure:

    [​IMG]
     
  17. Wasnex

    Wasnex

    Dec 25, 2011

    I don't know about the construction of the 1001RB. On my older 2000RB, there are little wires in some of the holes where components are mounted instead of direct connection to the solder traces. The wires are actually twisted around the component leads when they are soldered. It's very easy to break the wires off when you remove a component. Without the wire, the terminal of the component does not have continuity with the circuit trace even though it is soldered in place

    I suggest taking a look at the circuit board and tracing out the circuit path from the jack to ground and also the first component in the signal path, which should be a resistor. Check continuity between where the jack is soldered to the board and these two points. If continuity is broken, use use small wire to bridge the gap.
     
    chowderhead1962 likes this.
  18. Wasnex

    Wasnex

    Dec 25, 2011
    Weird that your's are reversible. Pretty sure the ones on my 2000RB and 700RB are keyed so they can only be inserted one way.
     
  19. agedhorse

    agedhorse Supporting Member Commercial User

    Feb 12, 2006
    Davis, CA (USA)
    Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
    I would be shocked it they were reversible too. Now with enough force, anything can probably be reversed...
     
  20. chowderhead1962

    chowderhead1962

    Apr 28, 2013
    IMG_2087.jpg Here is the resoldered jack. IMG_2088.jpg These are the effects jacks for comparison IMG_2089.jpg This is the tweeter lead I was mentioning. The tweeter and woofer leads in the input board both have the same connector. And they can be put on either way.