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Acorn Archimedes A4000 Maintenance Guide
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== โ ๏ธ CMOS backup battery == The A4000 keeps its configuration and clock in battery-backed CMOS RAM, with the cell at the '''top-right''' of the board.<ref name="chris" /> As on every Acorn machine of this era, an ageing backup battery can leak and corrode the surrounding tracks. Inspect it on any unrestored machine, clean any residue with isopropyl alcohol, check the nearby tracks for continuity, and replace the cell. Lost configuration, a wrong clock or boot problems are the usual symptoms of a failed cell.
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