Capacitors on M8722 Board

[Jon Elson]

On 9/4/21 4:34 AM, Rob Jarratt via cctalk wrote:
> I have a PDP 11/24 which I hope to power up soon. The last time it had power
> I noticed a bit of a burning smell which I failed to track down. However, I
> did notice one capacitor on a memory board has a strange appearance, almost
> as if there is some corrosion under the surface, it doesn't seem to be
> bulging though, except along the top, but if it is bulging it is very bumpy.
> I have a picture of it here:
> https://rjarratt.files.wordpress.com/2021/09/wp_20210904_10_15_28_rich.jpg.
> It is marked 47uF 30V, but it is also marked 20v as can be seen in the
> picture.
>
>   

Voltage is not critical, as long as it is above the supply 
on that bus.  But, that aluminum electrolytic cap certainly 
looks like it is ready to fail, possibly catastrophically.

Jon