Emax

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@...m 
>   > 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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