Apple Lisa I/O board diodes
drlegendre at gmail.com
Thu Feb 18 19:02:25 CST 2016
FYI, I get a 403 on that link.
As for the diode, unless the leads are seriously rotted, why not just make
a +note+ of it - and leave it alone? It's a hermetically sealed package
(glass+metal, right?) and not likely to have suffered in any way, aside
from the cosmetic issue.
On Thu, Feb 18, 2016 at 6:51 PM, Adrian Graham <witchy at binarydinosaurs.co.uk
> Hi folks,
> 'Decaying battery' panic led me to unearthing my Lisa 2/5 to check the
> of the batteries on the I/O board since it hadn't been out of its box or
> powered up since 2005. Fortunately the damage is very minimal and is only
> restricted to track discolouration and external rotting of one particular
> diode which I can't find mention of on my schematics.
> Anyone with a 2/5 care to check their I/O board for me please? The diode is
> D8, just above the battery location. It's in the board in such a way as to
> make its markings pretty unreadable in the pictures I took before cleaning,
> but it's the only white diode in the machine and I'm guessing it might be a
> 5.6V 1N4734A based on what I can see. Fortunately it still works for now,
> 0.7V voltage drop.
> Pic of the board before cleaning is at
> Binary Dinosaurs creator/curator
> Www.binarydinosaurs.co.uk - the UK's biggest private home computer
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