apple Lisa2. One working!! - one to go?
ard at p850ug1.demon.co.uk
Tue Dec 14 13:47:42 CST 2010
> Just an update on this project. I've found someone local (5 mins drive) who
> has a Lisa 2/10 in storage plus spare parts and spare boards. After Xmas
I am, as ever, in the wrong country. I've never actually seen a Lisa, and
you seem to ahve access to 4 of them...
> we'll remove the Lisa from storage and I should be able to swap out the IWM
> and ROM to see if that tells us anything. His Lisa has a non-working PSU
I would think it's safe to put untested ICs into your machine, but puting
anyting into a machine whioch could have PSU provlems seems to be a
However, as (presuambly) you don;'t know these spare chips atr good, if
the machine still dcesn't work, you dont; know if the problems is
somewhere else entirely, or it is the ROM 9say), but you've not fitted a
> and I have a spare working one so some swapping might be on the cards
> depending on what's there.
I thought the PSU schematics were available. A lot of faults could be
_rpeaired_, it's not that complex a supply (althogh SMPSUs are paerhaps
not that pleasant for beginners to work on, thay have a lot of live
circuitry ('live' as in 'directly connected to the mains), which will
giee you a very nasty shock (at best  if you do the wrong thing. Oh,
and making a mistake can also result in lots of expensive power
 At worst you won't feel a thing. Ever again.
However,m if you want to have a go at fixing the dead PSU, I cna cuggest
so things to do there too. Most of which are done with the PSU unplugged
from the mains.
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