Re: JU570-2 caps and fix

From: William Levak <wlevak_at_SDF.ORG>
Date: Mon, 20 Jul 2015 16:36:48 +0000 (UTC)
Message-ID: <Pine.NEB.4.64.1507201632560.5910@sdf.lonestar.org>
It depends whether it really needs bipolar caps.  If it does, then you use 
two caps in parallel, opposite polarity, so that the result is the same as 
the single cap.  If it doesn't, then a single cap at double the voltage, 
will work, assuming you get the polarity right.

On Mon, 20 Jul 2015, H~ARSFALVI Levente wrote:

> Hi!,
>
>
> I'm about to fix a 8296D. The internal 8250LP has a pair of JU570-2 drives 
> with pretty obvious traces of capacitor leak... they definitely need a good 
> cleaning and recapping. In this thread (already mentioned on this list about 
> half a year ago, 
> http://forum.classic-computing.de/index.php?page=Thread&threadID=7382 ) there 
> is a precise list of the used caps.
>
> I've already recapped some of my vintage machines in the past and used 
> ceramic and tantalum caps as replacements whenever possible, so that they 
> won't need to be fixed again (and the implied salvaging could be avoided...) 
> at some unpredictable time in the future.
>
> The JU570-2 seems to be a simple case, except for the three bipolar 
> electrolytic capacitors (10uF 25V), which just can't be replaced by simple 
> tantalums.
>
> I'm asking your opinions. What, if I simply replace these caps by todays 
> cheap 10uF ceramics?
>
>
> Thanks,
>
>
> Levente
>
>      Message was sent through the cbm-hackers mailing list
>

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

       Message was sent through the cbm-hackers mailing list
Received on 2015-07-20 17:00:08

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