Emax

You must read all post, but i recommend you check all solder points in key range board.
Test all contacts wires with tester (polimeter) and diodes of keys overall since the key wich faults to end

--- In emax@yahoogroups.com, "cheju_99" <cheju_99@...> wrote:
>
> i have exactly the same problem, replace the scan chip with a new one with no success, you finally fixed?.
> 
> --- In emax@yahoogroups.com, "jammie" <jammie.emma@> wrote:
> >
> > 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
> > 
> > 
> > 
> >   
> > 
> > [Non-text portions of this message have been removed]
> >
>