21 Jan
2017
21 Jan
'17
8:06 a.m.
On 19/01/2017 15:47, "Tony Duell" <ard.p850ug1 at gmail.com> wrote:
On Wed, Jan 18, 2017 at 11:42 PM, Adrian Graham
<binarydinosaurs at gmail.com> wrote:
Brilliant, thanks! Nice to see what a clean unit looks like too, mine looks
like it's been in the wars.
I'm back from a little break to see my Missus so I'll clean up the board and
see how bad the damage/rot is.
Cheers,
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?
On 18 January 2017 at 20:13, Tony Duell
<ard.p850ug1 at gmail.com> wrote:
I did have a little time today so I've taken it apart and taken some photos. I
will try to upload those next time I am in the library...
If the capacitors are the ones I think they are, the larger one nearer the
edge of the board is 47uF at 25V, the other is 10uF at 25V. They seem
to be power supply decoupling (the former is between the +12V rail and
ground, the latter is fed from a low value resistor from the +12V rail and
also goes to the +ve power pin of an LM324 op-amp). That means they
are not critical. But if they have been electrically damaged, it suggest
severe overvoltage on the 12V line which could have damaged other
parts.
Just to keep you updated, I have located one of my units that contains said
drive. I am rather busy at the moment with more mundane things, but I will
try to pull it apart and identify said capacitors.
Thanks Tony :)