Re: Lisa I/O board troubleshooting, and schematic weirdness

>> The I/O board for the 2/10 is different from the 2/5, so their
>>schematics differ...
>
>That's just it... they don't. I have both in front of me. *Both*
>schematics show that chip. ... I'm wondering if this one page is
>incorrectly marked as being for the Lisa 1.
>
>Lisa 1 - http://lisaem.sunder.net/LisaSchem/Lisa1SysIO3.gif

That is a labelling error... that's not a Lisa 1 (or 2/5) I/O board.

Download this archive:  

ftp://ftp.apple.asimov.net/pub/apple_II/documentation/applelisa/AppleLisa%20-%20Schematics.zip

And in the folder "Lisa Schematics - Scanned"

   LisaSchem_io1.PICT through LisaSchem_io5.PICT

>I cleaned up the corrosion in that corner, and cleaned up the edge
>connector, but I haven't actually sat down and checked all the vias
>at the bottom of the board - I would not be surprised if one of
>those is making poor contact due to the corrosion.

Definitely prime suspects, along with any traces that run under a chip.

>I really wish I had a schematic of the backplane - has anyone ever seen one?

Some of the Lisa schematic sets have one, but I haven't seen any that seems truly complete. Probably good enough for checking the card-edge connectors though. I'll see if I can find one for you.

Good luck!

James

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