RE: 110V 60Hz / 220V 50Hz power supply

After the failure of the 9090/9060, commodore had to redesign a part of the
power supply to sell them in Europe.
They all failed the same way when powered with 50Hz.

When we checked the drive, we had 7.5v instead 5V

I don't know how many were affected, the failing one were 2 pre series.
It was not officially sold when we received them.

When the 9060/9090 came out, we already had our own hard disk solution for 2
years.

I don’t remember very well, but a chip in the power supply was working fine
at 60Hz
And failing at 50 Hz

--
Didier

-----Message d'origine-----
De : owner-cbm-hackers@musoftware.de
[mailto:owner-cbm-hackers@musoftware.de] De la part de Gerrit Heitsch
Envoyé : samedi 4 février 2012 17:59
À : cbm-hackers@musoftware.de
Objet : Re: 110V 60Hz / 220V 50Hz power supply

On 02/04/2012 05:38 PM, Rainer Buchty wrote:
> On Thu, 2 Feb 2012, Groepaz wrote:
>
>> nah. the fact that many PSUs actually contain transformators that can
>> be used for both 110/220v mains (and thus 50/60hz) simply by rewiring
>> should tell you that there is no such problem :)
>
> That doesn't contradict Gerrit. The point here is that the transformer
> was designed to work in both modes, therefore not being designed to just
> (or, today, barely...) fulfill its task.

You just need to use a 50Hz Transformer and design it so that it will be 
able to deliver enough power when run at 60Hz. Problem solved.



> (But, yes, I'm running quite some 120V/60Hz equipment from 240V/50Hz
> mains with a 240V/120V transformer in between, and so far never
> experienced any problems.)

So do I, but I always keep in the back of my mind that there could be a 
problem, especially if the transformer in question is loaded close to 
its specified maximum output.

  Gerrit


       Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list