Emax

actually i can be the scanner chip iv had it when you can play notes on kewyboard but when pressing buttons its arratic and jumps allover the place
  ----- Original Message ----- 
  From: emax_dx5 
  To: emax@yahoogroups.com 
  Sent: Monday, July 09, 2012 2:59 PM
  Subject: [emax] Re: Five top keys fault


    
  I won't go for the MPU Scanner (IM386). When it fails, no button or key usually work.

  You said you sent midi to the Emax and it made sound. Did you check the MIDI OUT commands the emax is sending? you can do it both with a Midi analyzer on your computer or using the function MIDI Scope. Check if it sends Key ON and OFF commands or not. If any of those cases:

  Go to the keyboard Printed Circuit Board. ONce you already checked diodes, Check continuity on the traces involved with those keys (a multimeter will do the job). If a common ground trace is open, this fault uses to happen.

  hope it helps.

  Best.
  Jose



  

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