Also check that ripple current rating and ripple current frequency
coefficients are similar to the original part.

-Ken

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Mark Rages
Sent: Monday, March 12, 2012 12:09 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE]: capacitor replacement on a monitor board

On Mon, Mar 12, 2012 at 8:36 AM, Justin Richards
<justin.richards@gmail.com> wrote:
> Hi Folks,
>
> decided to replace all the Electrolytics on a monitor board (Orion
> PWB-2022 like http://www.jomac.net.au/Orion%20PWB%202012-PWB2022.jpg)
> found in an old arcade machine because a 680uF 200WV (note WV not V)
> capacitor was bulging badly.
>
> The replacement I acquired (with some effort) =A0has markings of 680uF
> 200V and is about 2/3 the physical size.
>
> Questions:
>
> 1. Is 200V =3D 200WV. =A0Googling appears to indicate they are the same,
> that is [V]oltage =A0=3D [W]orking [V]oltage but the physical size
> difference has me concerned.

Are they the same temperature rating?  105C parts are often bigger
than 85C parts of the same specs. (If you are bothering to replace
caps, might as well use the better 105C rated part.)

>
> =A02. I assume ceramics, greencaps and caps that look like a
> Polypropylene Film Capacitor eg
>
http://www.1st-product.com/products/170/Polypropylene-Film-Capacitor-89663.=
h
tml
> dont need to be replaced. =A0 They never seem to appear in any cap kit
> lists for these types of boards so figure it is just the
> electrolytics.

Right, ceramics and film caps do not dry out like electrolytics.

--=20
Regards,
Mark
markrages@gmail

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