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 ." <[email protected]> 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 <[email protected] >> 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? >> >> >> -- Adrian/Witchy Binary Dinosaurs creator/curator Www.binarydinosaurs.co.uk - the UK's biggest private home computer collection?
