Emax

Hi Ted.
Thanks a lot for those informations ! Indeed, i did some search in my 
country about this item. I did pictures from the PSU circuit diagram to 
try to understand the "Logic" used to built this PSU and mail it to some 
friends.
A friend of mine (Sound Engineer for the Belgian television) gives me 
some very important informations :
The item i'm searching for should be :
"Through-Hole Schottky Rectifiers" 10A 40v

C10 means 10A peak-measure and P038 should be the Vmax.
I find specification on thoses parts : "C10P048" and "C10P03Q". The 
diagram on the item is similar, but the difference seems to be the "time 
diagram" for the diods used.
C10P048 & C10P03Q are "Schotty rectifiers" too.
It's like a redressor but only on a single alternance. It's mainly used 
to stabilize the +5V part of the PSU (on witch the "power-on monitor" 
led is soldered).
This item cost 1,50 euro approx. I'm gona buy it. If it's not the good 
part, i could think "I did my best".

Yes, another PSU is the solution too ... But it's anyway quite "bizzare" 
voltage... The E-MU Emax PSU uses +5, +12, -12, Gnd (3 times repeated).
But the -12V is not common to me... A typical PC PSU delivers +5/+12 and 
the "switch" is "logicaly switched to on/off". The other problem is : no 
physical ON/OFF switch on those PSU. So i have to find where the PC's 
PSU get their ON/OFF 'switch'.

Is someone who did pictures of this "swapping PSU" on this group ?
Have you only inverted Gnd & +12V to give -12V to the Emax logicboard ?

Anyway, i'm going to fix this PSU trouble quickly !
Thanks a lot for all the help you give ! :)

J/M


ted Summers a \ufffdcrit :
> Well- my friend  (he is a Electronics Tech in industry for 25 years) I  
> called tried to cross the item. It is not in the Japanese cross  
> reference. This is what is called an "in-house" part. A company stamps  
> a number on a device that is really only used "in-house" as a part  
> number and is never released to anyone save an OEM.  If released  
> generally it is given a different number. This is most likely why it is  
> not cross-able. He also said from the diagram that it is not  
> necessarily a TRIAC either, it could be a DIAC or MOS-FET. On  
> non-cross-able items the diagram may not really be what the item  
> is.....He informed me that TRIACs are almost never used in a power  
> supply. (save when used as a "crowbar", but that is not an industry  
> accepted practice to do...) He has access to purchase obsolete items as  
> well (He makes major IC component purchases for a large (200 site)  
> Amusement Company). He could not source the part. If you ever found it,  
> it might cost as much as $40 plus shipping. That is a big IF
> 
> The solution he recommended was to buy a small power supply and replace  
> the old PSU. Others have done this here on the group, I believe.
> 
> I am assuming it is an +5 and +12 power supply (without actually  
> opening it up- can anyone confirm this?)
> 
> With that assumption: here are some options......
> 
> www.bgmicro.com look at page 13 of their catalog- cheap and looks  
> promising.... the A+ switcher on this page.....
> www.jdr.com has open-frame power supplies.
> http://www.allelectronics.com/cgi-bin/category.cgi? 
> category=480&item=PS-4350&type=store
> 
> These are all in US- but should give you some ideas....heck bgmicro  
> even takes paypal....
> 
> Hope this helps,
> Ted
> 
> 
> 
> 
> You are looking to provide +5 and +12
> On Jul 26, 2005, at 7:51 AM, Jean-Marc M\ufffdlot wrote:
> 
> 
>>Thanks a lot Ted !
>>But i really can't find any kind of informations on this \ufffdl\ufffdment :(
>>I just phone to a important electronic dealer in Brussels but they
>>cannot help me. This reference is unknown for them.
>>I'm still searching for any datasheet on the web but without success.
>>I'm almost sure (i'm living in Belgium) that electronic store have only
>>'Nedis' (Philips) or 'Texas Instrument' equivalence. So i try to find
>>the specification to get a 100% compatible electronic component.
>>Have you any idea 'bout the specification for this item ?
>>Here you can find the drawning of this item :
>>http://www.moderncubism.com/Z/part.jpg
>>
>>J/M
>>
>>
>>ted Summers a \ufffdcrit :
>>
>>>that is a transistor. the C designates it is a japanese part. The REAL
>>>part number would be:
>>>2SC10P038
>>>
>>>Try and get that part, and all will be good....
>>>Hope this helps,
>>>Ted
>>>
>>>On Jul 26, 2005, at 3:49 AM, Jean-Marc M\ufffdlot wrote:
>>>
>>>
>>>
>>>>Hi all.
>>>>I've got a trouble with my EMax S.E.
>>>>The sampler was "power off" but anyway when, by a sunny morning, i
>>>>tried
>>>>to switch it on ... Nothing !
>>>>My first action was to unscrew the machine and check fuses and others
>>>>"mechanic" (wire connexion, ...) possibilities. But with success ...
>>>>
>>>>So i've tested the internal PSU and noticed the +5V was down.
>>>>It seems that there are 2 faulty components :
>>>>- Capacitor (22000 microFarad - 10V) : Electrolytic
>>>>- Triac (2 diodes, common cathod) but i cannot find any piece of
>>>>information on this element ... :(
>>>>
>>>>The element is screw on a little thermal dissipator with 3 pins and  
>>>>the
>>>>reference is : C 1 0 P 0 3 8 (and a little code in the right up  
>>>>corner
>>>>:
>>>>IR4J).
>>>>I guest it's just a dual diode redressor with a common cathod  
>>>>(centered
>>>>pin) but i cannot find specifications... Maybe 10A... And this  
>>>>element
>>>>is in the low-voltage part of the PSU (10V ... Maybe 12V).
>>>>
>>>>Any clue ?
>>>>
>>>>Thanks a lot
>>>>Jean-Marc.
>>>>
>>>>-- 
>>>>Jean-Marc
>>>>http://www.moderncubism.com
>>>>
>>>>
>>>>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
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>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
> 
> 
> 
>  
> 
> 
> 
> 


-- 
Jean-Marc
http://www.moderncubism.com