RE: Fixing the C900 power supply

From: Martin Hoffmann-Vetter <>
Date: Mon, 12 Jan 2015 15:22:23 +0100
Message-ID: <004e01d02e73$2f3edcb0$>
Hello Gerrit,

>>>> My C128DCR's PSU had those golden coloured ROE electrolytic caps as
>>>> well, and in my case two of those were shorted.
>>> There are indeed five of them there. They are labeled something like
>>> "2200/15" - I assume this means 220o uF and 5 Volts?
>> Yes, 2200/15 means the capacity of 2200 µF and a proof voltage of
>> max. 15V. Normally the caps need a proof voltage of the double
>> norminally voltage. Higher is good (for longer life) but not needed.
>> So the caps in the 5V way must be 10V, in the 12V way you need 25V. 
> Ich have plenty power supplies that use 16V caps for the 12V part
> without blowing up. I have also seen 6.3V caps in 5V curcuits that
> gave no problems.

Yes, you are right. You can try to use 16V caps for the 12V usage. But the life is shorten! So it's better to use only the half of the proof voltage for long life. Only the low cost china power supply units use 16V caps for 12V.


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Received on 2015-01-12 15:00:03

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