Apple Lisa I/O board diodes

[Adrian Graham]

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?