Emax

> hello there, i'm new to this list.
> i just bought an emax rack without psu (well, it was there, but all the
> wires were cut, i did remove it).  i  searched  the list archive and
> read about original psu replacement issues.
> but what about using a normal pc power supply? they are everywhere to be
> found for cheap and able to feed those +-5v and 12v emax needs.
> 
> So should i buy one of those pc psu, or collect more money and get an
> original one (if epr electronics can deliver it in italy)?
> aren't they the same thing after all?
> 
> thanks, i hope to revive it soon.
> (it seems the problem was someone plugged it into a 220v socket, but i
> was setted for 110v. hope the psu is the only thing that got burned)
> 
> ciao, davide
> 
> 
> 
> 
> 
> Emax and Emax II User's Group Website
> 
> http://www.silveriafamily.com 
> Yahoo! Groups Links
> 
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> 
>  
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> 
>

>Hi !
>I did a PSU replacement on a Emu EMAX S.E. rack some months ago... The 
>original PSU failed in a capacitor and schkotty diod ... I never find 
>those parts in my area, and a new psu was around $80 (but as i'm living 
>in belgium ... the cost is much more expansive with additionals taxes). 
>So i did the "swap" myself between a typical ATX PSU and the original one...
>
>It's really simple. Just use a voltmeter ... A typical ATX can provide 
>-12v / -5 / +5 easily (the ATX psu is much more powered than the emu 
>one). There are enought space inside the Emax. I used a special glue to 
>maintain the PSU.
>The sad side is you'll get the PSU fan noise but the sampling process is 
>not affected (noise parasits ...) !
>The ON-OFF Wire on a ATX psu could be found here : 
>http://www.helpwithpcs.com/courses/power-supply-basics-inc-pinouts.htm
>
>You have to close the circuit between PS_ON & a GND pin to get the PSU ON.
>
>Hope this help,
>J/M
>
>  
>

> this is great news Jean-Marc, thank you very much!  i'm gonna try it soon!
> 
> last question :  originally there were 3 different sources for every 
> different voltage on the psu, and also 3 different spots on the board.
> is it safe if I wire the 3 equally labeled connectors on the board to 
> the same voltage source instead of having 3? (can I short ,say ,more  
> -12v connectors on the board together, and wire them to the same -12v 
> connector on the psu?).
> I'm asking because atx psu features only one -12v source and of course 
> because i'm dumb.
> 
> thanks a lot!
> Davide
>  
> Jean-Marc M\ufffdlot wrote:
> 
> 
>>Hi !
>>I did a PSU replacement on a Emu EMAX S.E. rack some months ago... The 
>>original PSU failed in a capacitor and schkotty diod ... I never find 
>>those parts in my area, and a new psu was around $80 (but as i'm living 
>>in belgium ... the cost is much more expansive with additionals taxes). 
>>So i did the "swap" myself between a typical ATX PSU and the original one...
>>
>>It's really simple. Just use a voltmeter ... A typical ATX can provide 
>>-12v / -5 / +5 easily (the ATX psu is much more powered than the emu 
>>one). There are enought space inside the Emax. I used a special glue to 
>>maintain the PSU.
>>The sad side is you'll get the PSU fan noise but the sampling process is 
>>not affected (noise parasits ...) !
>>The ON-OFF Wire on a ATX psu could be found here : 
>>http://www.helpwithpcs.com/courses/power-supply-basics-inc-pinouts.htm
>>
>>You have to close the circuit between PS_ON & a GND pin to get the PSU ON.
>>
>>Hope this help,
>>J/M
>>
>> 
>>
> 
> 
> 
> 
> 
> Emax and Emax II User's Group Website
> 
> http://www.silveriafamily.com 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
>

>Hi Davide,
>In fact i did just one common connector on the ATX psu to deliver power 
>: It's the -12V.
>For the others voltage i've choose each time a separate power wire from 
>the PSU ...
>So, the common -12V from the ATX PSU seems powered enough for the Emax :)
>Hope your Emax will rebirth for long years ! ;-)
>Jean-Marc
>
>  
>

>Dear list,
>i just installed a new psu on an emax rack (thanks JeanMarc!) and i'm 
>testing it.
>it works but voices are missing.
>another flaw, the most annoying, it is some notes get stucked requiring 
>a panic button push. it is totally unplayable
>After running the ERAM test in the diagnostic menu, it says error 
>detected caused by IC35. sometimes it says IC??
>Do someone know which IC is the one number 35?
>I guess i can just  open up the machine,  IC numbers should be written 
>on the board, anyway:  any suggestion?
>
>thanks!
>da vi de
>
>
>
>Emax and Emax II User's Group Website
>
>http://www.silveriafamily.com 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>
>  
>

> 
> 
> 
> Emax and Emax II User's Group Website
> 
> http://www.silveriafamily.com 
> Yahoo! Groups Links
> 
> 
> 
>  
> 
> 
>

>davide aprea wrote :
>  
>
>>Dear list,
>>i just installed a new psu on an emax rack (thanks JeanMarc!) and i'm 
>>testing it.
>>    
>>
>
>Hi davide ! Really glad to know your new psu seems to work quite well 
>with your emax ! :)
>
>  
>
>>IC35 is labeled TMS4256-15NL
>>it should be something like a ram chip
>>    
>>
>
>Mine is labelled "MB81256-12" from Fujitsu and it is a ram memory 
>(256Kx1 NMOS, DIP16). It costs usualy about $6 or $7...
>But i don't know if your keys trouble is linked to this chip .. :(
>
>Hope you'll find what's wrong with your emax !
>Jean-Marc.
>
>  
>