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PDP-11/20 General Maintenance
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== Preventive maintenance checklist == # Clean the filter and fans; confirm all four fans run.<ref name="ds" /> # Check both box covers are fitted.<ref name="h31" /> # Measure +5 V and β15 V at the backplane against the table above.<ref name="sm" /> # Check the SCLK period at E03F1 if the processor has been worked on or modules swapped.<ref name="ka59" /> # Run the processor and memory MAINDECs, then Processor Test 17.<ref name="ka511" /> # After replacing an MM11-E module, check the V REF, V SLICE and STROBE DEL settings.<ref name="mm" />
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