B256 supply bleeps!

From: vossi <vossi_at_ceffy.de>
Date: Thu, 19 Oct 2017 20:40:15 -0700 (MST)
Message-ID: <1508470815657-0.post@n4.nabble.com>
Hi Bill, 
you have to change all the electrolytic caps in the B256-supply. 
It starts with bleeping more and more and sometimes the machine doesn't
start anymore! 
Especially the golden caps are problematic. If you have japanese caps in the
supply (often orange) - they are mostly ok. 
Also you have to change the filter caps at the voltage input - they explode
sometimes! 
I watched the US-supply schematics and it looks similar to the EU-supply. It
has the same prblematic 1000uF and the filter caps. 

I changed the caps of more than ten 6xx and 7xx machines in the past - and
after that - all machines were silent ;) 

Christian 

william degnan wrote 
> I have today put my CBM 256 up on the work table and ready to go if anyone 
> needs me to run a test of the card.    I ran it for about 5 hours to 
> freshen it up but the power supply is a little weak and it squeals for the 
> first 10 minutes or so. 
> Bill 



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Received on 2017-10-20 04:00:37

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