Re: Working on a //+

[Stephen Shaw <xstephenx@apple2.org.za>]

On Sat, 22 Sep 2001 07:51:02 -0400, Tom Zuchowski wrote:

> Ralph, don't waste your time testing the capacitors. If they are ten years
> old, they should be replaced. Heck, for these older caps that we are
> discussing, they should generally be replaced when they are six years old
> as they are not as good as modern replacements. Just because an elderly cap
> tests OK now doesn't mean it will test OK in a year. Caps are cheap and
> easy to install if you have basic soldering skills.
>
> You do not need precise replacements. Any cap within approximately
> -20%/+20% of the capacitance and the same or higher voltage rating should
> work perfectly well. Generally capacitor ratings have that tolerance and in
> many cases caps of a much wider variation will do if you know how to make
> such decisions.
>
> NOTE: we are discussing the aluminum-electrolytic caps. These are
> cylindrical and almost always have a crimped ring on one end. Sometimes
> they have leads on both ends and some times both leads are on one end. All
> other caps in the power supply will very likely be OK.
>
> Be sure to keep track of the positive and negative markings. Caps that are
> installed backwards will have a very short life.

I'll say! Normally the "life" extends to splattering the ceiling!
 
>
> Tom Zuchowski
>
>> > Ralph Glatt replied:
>> >
>> >>Hi, Mike, thanks for responding! Yes, I earlier posted about a problem
>> >>with my Apple ][+. I did take apart the power supply, but I didn't see
>> >>anything leaking. I'll pull it apart again and give it a thorough

-- 
What did you do to the cat? It looks half-dead. --Schrodinger's wife