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Acorn Archimedes A3000 Maintenance Guide
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== โ ๏ธ Safety: mains voltage inside the case == Unlike the 8-bit [[Acorn Atom]] and [[Acorn Electron]], the A3000 carries a mains-powered switch-mode PSU inside the case. The Service Manual is explicit: '''dangerous voltages are exposed inside the case when the cover is removed; disconnect the computer from the mains before removing the cover.'''<ref name="sm">[[Acorn A3000 Service Manual]], Acorn Computers — hosted on this wiki. Source for the PSU performance figures (output 4.9–5.1 V, up to 4.4 A, 22 W continuous, 50 mV pk-pk ripple, over-voltage threshold 5.8–7.0 V), the 240/120 V mains-selector link, the mains-hazard warning, the full PCB parts list, the test points, and the fault-diagnosis procedures.</ref> * Unplug the mains lead before opening. The PSU is a separate cased module inside the unit; do not open or attempt to repair the PSU module. * The PSU input voltage is set by a link wire to the pin marked '''240''' (or '''120''') on the supply. If the link is changed, label the new voltage on the case and fit the correct mains plug.<ref name="sm" /> * Observe anti-static precautions for the ARM2, MEMC1a, VIDC1a, IOC and the DRAMs.
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