Is your coin-op Donkey Kong Junior sound board (the small board next to the monitor circuit board) all hosed up and not playing any sounds or making the games sounds not clear?? Maybe you're tired of that loud buzzing sound coming from the speaker, due to a factory engineering error at nintendo. If so, we are offering a repair, refurbish, and modification service for your board!! We have been repairing classic coin-op arcade PC boards for over 20 years and counting. I have a personal collection of over 60 arcade classics, as well as maintain a Facebook page where all repairs are documented and photographed, so that details of repair can be shared with the arcade community.
Here are the details of this listing:
   You box up and send your non-working Donkey Kong Junior(upright,or cocktail style game) sound board (should look similar to the one in the picture) to us. 
   We will first clean the board, followed by replacing ALL of the electrolytic capacitors, then repair the board is needed. Next, we will perform the modification that eliminates the constant buzzing sound that comes from the speaker, present on all classic Nintendo games. No more issues from this sound board ever again!!!! After repairs are done and the board has been function tested, we will pay to ship the board back to you (U.S. only)!! 
  We only use quality Pace brand soldering/desoldering equipment so your board will not be butchered up during the repair process.
   Please note that the 'free shipping' in the above description applies only to the return shipping back to you once the repairs have been done.
If you have any questions, please ask and I'll be happy to answer them for you.