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Acorn Archimedes A4000 Troubleshooting Guide
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== โ ๏ธ Mains warning == The A4000 has a mains-powered switch-mode PSU inside the case. Disconnect the mains lead before removing the cover. Never open the PSU module; it is exchanged, not repaired, and the full earth-continuity and DC-insulation safety tests must be re-applied after any internal work.<ref name="sm" /> [[File:Acorn Archimedes A4000 circuit diagram (1 of 3).png|center|thumb|680px|Acorn A4000 "Roadrunner" main PCB circuit diagram, sheet 1 of 3 (Technical Reference Manual), showing the ARM250, the battery-backed RAM/RTC, reset circuitry and the filtered +5 V supply. Sheets 2 and 3 are also on the wiki. (Source: The Centre for Computing History.)]]
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