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Apple Lisa Troubleshooting
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== โ ๏ธ The I/O-board battery pack โ remove it now == The Lisa keeps its real-time clock alive with a '''4 ร AA NiCd pack strapped to the bottom-right of the I/O board'''. These packs leak corrosive electrolyte and are the single most destructive Lisa fault — when they let go they can '''destroy the I/O board and the motherboard, and in rare cases the CPU and RAM boards'''. '''Remove the battery pack from any Lisa immediately''', and clean and repair any corrosion before powering up.<ref name="lisa">[https://lisafaq.sunder.net/single.html The Apple Lisa FAQ]; [https://tinkerdifferent.com/threads/lisa-2-repair-journey.1151/ Lisa 2 repair journey], TinkerDifferent; [https://www.classic-computers.org.nz/blog/2011-03-05-rejuvenating-a-lisa2-10.htm Rejuvenating an Apple Lisa 2/10], Tezza's Classic Computers; and the Apple Lisa Do-It-Yourself Guide. Source for the I/O-board battery-pack leakage, the PSU failure, the Twiggy-drive unreliability, and the boot-ROM error codes (40 = CPU/MMU, 57 = disk controller).</ref>
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