Vintage Synth Repair

Hi Noel,connected it via midi to my yamaha and the yammy will play the U20 but U20 won't play the Yam,just top & bottom note so seems like the keyboard.All the keys play freely.I can understand all octaves of certain notes not playing as keyboards  are usually addressed as a matrix,but all notes in between has me stumped.Any other ideas gratefully accepted.Colin.
  ----- Original Message ----- 
  From: Noel Buhagiar 
  To: vintagesynthrepair@yahoogroups.com 
  Sent: Monday, August 08, 2011 10:31 PM
  Subject: Re: [vintagesynthrepair] roland U20


    



  Hi Colin,
  You could try and connect it to another synth using MIDI IN-OUT and see if it plays ok.
  If it does, problem could be a bad keyboard and then you’ll take it from there.
  Old U-20s were known for the sticky-keys problem; are the keys free when played?
  Hope that helps & keep us posted
  Regards,
  Noel

    
  Hi, I have an old Roland U20 keyboard,when powered up,only the bottom and the top keys on the keyboard work,all in between do not produce a note.Everything else seems fine,any ideas?? Cheers Colin