[Coco] Off Topic but computer related

[Dave Philipsen]

Here's a link to some caps that would probably be a good fit physically 
if you ever run into the problem again.

http://www.digikey.com/product-detail/en/10PX3300MEFC10X20/1189-1056-ND/3133989

And just a wee bit bigger than what you spec'd but probably better quality:

http://www.digikey.com/product-detail/en/ECA-1CM332/P5144-ND/245003

Dave Philipsen


On 8/20/2015 5:36 PM, Robert Gault wrote:
> While I still have my Coco3 running, I do most Coco work with 
> emulators on a PC. The PC is running WinXP on an Asus A7V8X-X 
> motherboard with an Antec true430 430watt power supply.
>
> Well for some time this system has been behaving strangely with one of 
> the symptoms being that my USB Logitech mouse has the LED lamp turn 
> off with Windows subsequently freezing. Finally I woke up and paid 
> attention to the voltages as reported by the Motherboard Monitor 
> program. The +5V, 36A line from the power supply was running anywhere 
> from 4.7-4.2v.
>
> To make a long story short, eventually I opened the power supply and 
> looked for swollen capacitors. Three of the four +5V line caps were 
> swollen.
> I removed all four and measured the values. The 3 swollen were zip 
> with the forth reading less than 1000uF. Spec is 3300uF, 10V, 105degC 
> made by Fuhjyyu.
> Well seems this company has a bad rep for caps and this power supply 
> had been known to fail. I was just lucky that it lasted as long as it 
> did, longer than reported by other users.
>
> Now there may be caps available that match the original 10x25mm size 
> but they weren't available locally. My local electronics store had 
> some NTE caps with the same electrical rating but were more like 
> 12x20mm. I managed to squeeze in four such caps even though they did 
> not fit properly and the caps could not be set perpendicular to the 
> circuit board. They hit each other and some other parts.
>
> Current voltage is 4.9v on the +5V line, running with minimal 
> overclocking of the motherboard!!!
>
> Robert
>