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IBM RS/6000 Maintenance Guide
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== Safety Warning == All RS/6000 PSUs contain mains-rectified bulk capacitors that hold a lethal charge after power-off. Before any work inside any PSU shell: # Power off and unplug the mains lead. # Wait at least 30 seconds. # Discharge the bulk capacitor through a 1 kฮฉ / 5 W resistor. # Verify with a multimeter. Rack-class RS/6000s (7015, 7026 H-series) may carry dual or redundant PSUs and may also be wired to '''โ48 V DC''' instead of mains (especially R24 frames in telco service).<ref>IBM, ''RS/6000 7015 R-Series Installation and Service Guide'' (manualslib summary)</ref> Confirm the input topology of the specific system in front of you before any service work.
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