Synth-DIY Yahoo! Groups Archives

Emu Emax intermitent distortion

2015-10-28 by Shawn Ward

my Emax keyboard has been acting up and sometimes will start playing loud distortion with the sample i have loaded

it seems to do this with all my different sample banks so I'm guessing its not a corrupt sample problem and could be something in the output board

any tips to troubleshoot would be appreciated!

Shawn

Re: Emu Emax intermitent distortion

2015-10-28 by krikor kouchian

Hello

You can try reseating the ICs but first I would try to move the jack in and out on the output of the machine, weirdly that solved it for me, even though i changed all jack connectors on my machine! they seem to be short circuit on the PCB, I think due to aging and bad storage of the machine.

best
K

--
http://www.krikor.fr
+33632199413

For Live&Dj bookings contact: cedric@...

RE: [emax] Re: Emu Emax intermitent distortion

2015-10-29 by Shawn Ward

hi Krikor

thanks for the tip, i tried the trick with the jack outputs but no luck

I also tried re-seating some of the socketed ICs on the audio board but now the distortion is even worse :(

i might try cleaning the sockets with a toothbrush and a bit of de-oxit

cheers

To: emax@yahoogroups.com
From: emax@yahoogroups.com
Date: Wed, 28 Oct 2015 07:568;09 +0100
Subject: [emax] Re: Emu Emax intermitent distortion

Hello

You can try reseating the ICs but first I would try to move the jack in and out on the output of the machine, weirdly that solved it for me, even though i changed all jack connectors on my machine! they seem to be short circuit on the PCB, I think due to aging and bad storage of the machine.

best
K

--
http://www.krikor.fr
+33632199413

For Live&Dj bookings contact8; cedric@referenceprods.fr

Re: Emu Emax intermitent distortion

2015-10-30 by jaumemod@...

Is the distortion only in loud volume or in tune/modulation too?

RE: [emax] Re: Emu Emax intermitent distortion

2015-10-30 by Shawn Ward

the distortion is mixed with the sample, I'm thinking its a PSU problem as i re-seated all the ICs on the audio IO board and the distortion only happens after it has been powered up for around 10 mins

going to recap the PSU and hope that solves it

To: emax@...m
From: emax@yahoogroups.com
Date: Fri, 30 Oct 2015 11:46:38 -0700
Subject: [emax] Re: Emu Emax intermitent distortion

Is the distortion only in loud volume or in tune/modulation too?

Re: Emu Emax intermitent distortion

2015-10-31 by dcka@...

I have an Emax and a problem I had sooo long ago (it was a warranty repair) was that if I played a note repeatedly and in rapid succession, some of the notes would come out distorted. It was as if some of the later polyphonic channels were bad (like the last one since it happened so infrequently) ... is that what you are talking about?

RE: [emax] Re: Emu Emax intermitent distortion

2015-10-31 by Shawn Ward

no this distortion happens to any sample being played, all notes play with distortion.

im almost sure its the PSU. does anyone know what voltage readings i should be getting on the rails?

To: emax@yahoogroups.com
From: emax@yahoogroups.com
Date: Sat, 31 Oct 2015 10:44:09 -0700
Subject: [emax] Re: Emu Emax intermitent distortion

I have an Emax and a problem I had sooo long ago (it was a warranty repair) was that if I played a note repeatedly and in rapid succession, some of the notes would come out distorted. It was as if some of the later polyphonic channels were bad (like the last one since it happened so infrequently) ... is that what you are talking about?

Re: [emax] Re: Emu Emax intermitent distortion

2015-10-31 by Ted Summers

Yellow wire is +5V

Orange wire is +12V

Green is GND

Purple is -12V

-T

You may also wish to check for presence of AC on the power wires, as there should be none / very little present.

On Oct 31, 2015, at 11:51 AM, Shawn Ward shawnjward@... [emax] <emax@yahoogroups.com> wrote:

no this distortion happens to any sample being played, all notes play with distortion.

im almost sure its the PSU. does anyone know what voltage readings i should be getting on the rails?

To: emax@yahoogroups.com
From: emax@yahoogroups.com
Date: Sat, 31 Oct 2015 10:44:09 -0700
Subject: [emax] Re: Emu Emax intermitent distortion

I have an Emax and a problem I had sooo long ago (it was a warranty repair) was that if I played a note repeatedly and in rapid succession, some of the notes would come out distorted. It was as if some of the later polyphonic channels were bad (like the last one since it happened so infrequently) ... is that what you are talking about?