DEC 3000/600 Alphaserver problems
Peter Coghlan
PETER at beyondthepale.ie
Wed Jan 12 12:59:25 CST 2022
On Wed, 12 Jan 2022 at 11:02:47 -0600 Jon Elson wrote:
> On 1/11/22 5:17 PM, Peter Coghlan via cctalk wrote:
>>
>> Thanks Jon.
>>
>> Here is a badly focused picture of the suspect components:
>>
>> http://www.beyondthepale.ie/cctech/p1010198.jpg
>
> WOW, I don't know what those are! They look like big
> ceramic caps to me, but if they don't have any polarity
> marking, then they can't be Tantalum. Big multilayer
> ceramics are prone to cracking due to board flexing, and
> that can cause catastrophic failure, too.
>
Thanks again Jon.
They do have spikes of solder sticking out from the positive ends
which can be seen in the picture. There are no circuit references on
the I/O board where the picture was taken. However there are markings
on the system board including little + signs at the same ends as the
solder spikes on similar capacitors on that board.
I tried desoldering one from the middle of the picture using two
soldering irons - I'm not very good at this surface mounted stuff :-(
It came out ok though. I must have got lucky and picked a good one
because it measured 47uF in the capacitance section on my multimeter.
Regards,
Peter.
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