20 Feb
2016
20 Feb
'16
11:10 a.m.
Phew.
Removed and cleaned up the components around the area, cleaned up the holes,
resoldered everything and replaced the 2 10K resistors that perished, check
for continuity, spend an hour trying to find a US power cord and...
http://www.binarydinosaurs.co.uk/LisaWorking2016.jpg
Same can't be said for its ProFile however, it span up and came online for
around a second before gracefully powering down so obviously a PSU issue
there. Add that to the 'things to fix' list.
Turns out my other Lisa is an upgraded 2/5 as well, I thought it was a
native 2/10 so the I/O board is the same as the damaged one. For reference
D8 is a 1N5234A 6.2V 20mA Zener. That machine doesn't power up either but
I've never tried in the 10+ years I've had it.
Adrian
On 19/02/2016 01:02, "drlegendre ." <drlegendre at gmail.com> wrote:
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
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?
wrote:
> Hi folks,
>
> 'Decaying battery' panic led me to unearthing my Lisa 2/5 to check the
> state
> 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
> http://www.binarydinosaurs.co.uk/LisaIOBoard.jpg
>
> Cheers!
>
> --
> Adrian/Witchy
> Binary Dinosaurs creator/curator
> Www.binarydinosaurs.co.uk - the UK's biggest private home computer
> collection?
>
>
> 