Emax

at least we can get replacement scanner cpu for the emax1/2/e3

but the scanner cpu for the ensoniqs which use the same chip but flashed with a different os as its only used for the buttons and controling functions of the vfd display and not the keyboard scanning as ensoniqs use there own scanner chip for that

are not available and a lot of esq1 and sq80 synths have hit the synth graveyard becuase of this im trying to rectify this as im  building an fpga replacement

and might do the same for the emax
  ----- Original Message ----- 
  From: jaumemod 
  To: emax@yahoogroups.com 
  Sent: Tuesday, July 10, 2012 2:10 PM
  Subject: [emax] Re: Five top keys fault


    

  Yeah...I ask myself suddendly what I will do when a motherboard or some chip faults.

  You can re-sold a bad solder point, you can change a contact spring (MicroKorg springs are very similar)....But boards tings and chips...bad...bad repair...Prayer to God!

  Maybe mod my ESI inside an Emax II lolollol

  --- In emax@yahoogroups.com, "jammie" <jammie.emma@...> wrote:
  >
  > pleasure to be of help thats what we are here for to keep these machines running as emu is not interested as of 93 for the emax as they only have to support a product after 6 years they can stop providing support and parts
  > 
  > this is the same for all manufacturers
  > 
  > but roland seem to keep a good stock always as for korg after 6 years your out of luck with parts as they just drop them unless its a part thats re used like the jalco phone sockets which are still the same since the korg dss1
  > ----- Original Message ----- 
  > From: jaumemod 
  > To: emax@yahoogroups.com 
  > Sent: Tuesday, July 10, 2012 1:14 PM
  > Subject: [emax] Re: Five top keys fault
  > 
  > 
  > 
  > 
  > REPAIRED!
  > 
  > I was the bad solder point at G#5 contact board.
  > 
  > Thx a lot Jose and Jammie.
  > 
  > --- In emax@yahoogroups.com, "jaumemod" <jaumemod@> wrote:
  > >
  > > 
  > > 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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