Re: C720 Power Supply Problems

From: Rob Clarke <crock_at_clarke-family.org.uk>
Date: Sat, 25 Feb 2012 11:44:14 +0100
Message-ID: <4F48BB7E.9010104@clarke-family.org.uk>
One new set of Nichicon caps later - 5.02v . Capacitastic!

http://inchocks.co.uk/commodore/B_Series/720PSU_Repaired.jpg


On 10/02/2012 00:10, Rob Clarke wrote:
> Goode evening chaps,
>
> So, having got the 610 working, I decided to tackle the 720. 
> Originally acquired without CPU, PLA or 6526, Ruud was kind enough to 
> let me have a good 6509, I got one of Jens' Super PLA's and a stock 
> 6526 - all of which I have proved good in the 610.
>
> I took the PSU out of the 720 to try on the 610. The original 610 PSU 
> gives a rock solid 5.01v under load but the 720 PSU is only putting 
> out 4.49v on the 5v rail and 13.8v on the 12V rail. It's enough for 
> the 610 to boot but it's certainly not healthy so it was quickly 
> unplugged.
>
> I don't any experience of old switching PSU's, is there any hope for 
> it? Could a new set of capacitors resurrect it or is there something 
> else I can try?
>
> Cheers,
>
> Rob
>
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Received on 2012-02-25 11:00:31

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