Re: About //c plus

[mjmahon@aol.com (Michael J. Mahon)]

CyberDez wrote:

>On 7-06-2004 19:29, in article 86y8mztgx7.fsf@raw.grenland.fast.no, "Raymond
>Wiker" <Raymond.Wiker@fast.no> wrote:
> 
>>       I did open the PSU, but I couldn't see any obvious way of
>> using it with 220V (like, say, a switch marked 110/220 V :-)
>
>If the layout is about the same of the IIgs PSU it's only a matter of
>soldering a single wire between two contacts: well, not really "contacts", I
>mean the small circular area of the PCB where the terminal of components are
>soldered but in this moment I forgot the right english word... :-D

We call them "pads".

>I tried (succesfully) this trick looking inside a common PC PSU and
>searching the same points in the IIgs PSU and I noticed that working in 110V
>or 220V was only a matter of how two big capacitors were connected and the
>status was selected with a little switch "110/220" on the PC PSU.
>I put them in the the same configuration on the IIgs PSU and it worked.
>Unfortunately I've not the IIgs anymore to tell you where are the 2 points
>to short BUT if inside the //c+ PSU there are these two (identical in farad
>value and voltage) big capacitors (usually just near the voltage input)
>there are good chances to do the same on the //c+ too ;-)

This is possible anytime that the PSU uses a line-side voltage
doubler in the 115v configuration.  To switch to 220v is simply
a matter of defeating the doubler.

-michael

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