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== Preventive Maintenance Checklist == # Measure the PSU rails before every long session. If +5 V is outside 4.85-5.20 V or +12 V is outside 11.4-12.6 V, recap or replace the PSU before powering up. # Reseat all socketed ICs annually. # Inspect tantalum capacitors on the motherboard and ISA cards for discolouration, cracking, or burn marks. Pay particular attention to '''C56'''. # Clean ISA edge fingers with isopropyl alcohol and a pink eraser. # Lubricate the floppy drive positioner rail with a small amount of white lithium grease; clean the head with isopropyl alcohol and a foam swab. # Cold-test the MFM HDD periodically โ exercise it for at least 15 minutes monthly to prevent stiction. # Verify DIP switch settings against SW1 silkscreen for the installed RAM and video adapter type.
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