Emax

The bad solder point corresponds to G#5... I'll tell you something...
--- In emax@yahoogroups.com, "jammie" <jammie.emma@...> wrote:
>
> yes a cold solder joint will do it as they are done in banks if one goes the whole octave will go
> 
> if it was just one key then i would of said dirt on the spring contact or the spring has snpped or fallen ot which also does happen
>   ----- Original Message ----- 
>   From: jaumemod 
>   To: emax@yahoogroups.com 
>   Sent: Monday, July 09, 2012 11:14 PM
>   Subject: [emax] Re: Five top keys fault
> 
> 
>     
>   The maneuver I performed for it working again was to raise the contact spring with a nylon stick while pressing one of five keys on the MIDI master keyboard. Then everything was returning to work.
> 
>   This must create a bridge between contacts or something similar
> 
>   Ouuuuk! For the moment I traced the contact ways to contact key and I find a bad solder point....perhaps it's the cause which when I turn upright sampler all faults again.
> 
>   Tomorrow I ll put a bit solder....I'll tell you something...
> 
>   THX a lot
> 
>   --- In emax@yahoogroups.com, "jammie" <jammie.emma@> wrote:
>   >
>   > i agree i recon its a diode or the return circuit to the scanner cpu
>   > 
>   > the scanner cpu gets pulse signals from when a key is pressed0volts to 5volts to zero volts like a half square wave cycle
>   > 
>   > he says he is getting voltage across the diode 5v when key is pressed
>   > 
>   > so to me the keys is making a circuit as tested but that siganl is not getting back to the cpu scanner
>   > 
>   > now its either the wire for that octave is damaged or there is a broken track 
>   > 
>   > he needs to trace the tracks from that octave and see if he is getting continuity to the header cable if he is then its at the mother board end 
>   > 
>   > as the scanner cpu is not recieving the trigger pulses for that octave
>   > ----- Original Message ----- 
>   > From: emax_dx5 
>   > To: emax@yahoogroups.com 
>   > Sent: Monday, July 09, 2012 6:09 PM
>   > Subject: [emax] Re: Five top keys fault
>   > 
>   > 
>   > 
>   > 
>   > Yeah I don't discard it at all, but three 1125's I had to deal with were completely dead when failing. Talking about a failing octave (just that) I would go for traces or diodes (appart from all suggested above). Those keyb pcbs are prone to crack traces . 
>   > 
>   > --- 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
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