18 Feb
2016
18 Feb
'16
7:51 p.m.
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?
18 Feb
18 Feb
7:57 p.m.
Forbidden
You don't have permission to access /LisaIOBoard.jpg on this server.
2016-02-18 22:51 GMT-02:00 Adrian Graham <witchy at binarydinosaurs.co.uk>:
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?
19 Feb
19 Feb
3:10 a.m.
On 19/02/2016 00:57, "Alexandre Souza" <alexandre.tabajara at gmail.com>
wrote:
Forbidden
You don't have permission to access /LisaIOBoard.jpg on this server.
2016-02-18 22:51 GMT-02:00 Adrian Graham <witchy at binarydinosaurs.co.uk>:
Fixed, I don't normally put things in the root of my webserver and forgot
about the permissions.
A
> 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?
>
>
>
--
Adrian/Witchy
Binary Dinosaurs creator/curator
Www.binarydinosaurs.co.uk - the UK's biggest private home computer
collection?
18 Feb
18 Feb
8:02 p.m.
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
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?
19 Feb
19 Feb
3:15 a.m.
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.
Fixed, I don't normally put things in the root of my webserver and forgot
about the permissions. The diode does still check out with my DMM, but it
looks plastic to me which is why I mentioned it - it's not your usual 1N4001
glass type and I don't have another I can compare it with since my other
Lisa is a 2/10 and the I/O board is different.
A
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?
>
>
>
20 Feb
20 Feb
2:10 p.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?
>
>
>
3075
days inactive
3076
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5 comments
3 participants
participants (3)
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alexandre.tabajara＠gmail.com -
drlegendre＠gmail.com -
witchy＠binarydinosaurs.co.uk