Editing Apple II General Maintenance (section)

== Internal Cleaning ==

Dust accumulation inside Apple II computers causes overheating and accelerates corrosion. Regular internal cleaning extends component life and improves reliability.

=== Motherboard Cleaning ===
For routine dust removal:
# '''Use compressed air''' held at a 45-degree angle to avoid forcing dust deeper into sockets
# '''Work from top to bottom''' allowing dust to fall away from cleaned areas
# '''Focus on heat-generating areas''' around the power supply connector and voltage regulators
# '''Clean between expansion slots''' where dust accumulates heavily

For thorough cleaning of heavily contaminated boards:
# '''Remove all socketed ICs''' and store safely in anti-static foam
# '''Wash with warm water and dish soap''' using a soft brush for stubborn areas
# '''Rinse thoroughly''' with distilled water to remove all soap residue
# '''Shake vigorously''' to remove water from sockets and under components
# '''Dry for minimum 48 hours''' in warm, dry location before reassembly
# '''Use isopropyl alcohol''' (99% concentration) for final cleaning of contacts

This water washing method effectively removes decades of contamination but requires complete drying before power application. Trapped moisture causes immediate failure and corrosion.

=== Keyboard Maintenance ===
Apple II keyboards accumulate debris that causes sticky or non-responsive keys.

'''Keycap cleaning:'''
# '''Remove keycaps carefully''' using an IC extractor or keycap puller
# '''Soak in warm soapy water''' for 30 minutes
# '''Scrub with soft brush''' to remove ingrained dirt
# '''Rinse and dry completely''' before replacement

'''Keyswitch cleaning:'''
# '''Apply 99% isopropyl alcohol''' to switch mechanism using squeeze bottle
# '''Work switch 50-100 times''' to distribute cleaner and break through oxidation
# '''Allow complete evaporation''' before testing
# '''Repeat if necessary''' for stubborn switches

The encoder chip (MM5740 on early models, AY-3600 on later) is extremely static-sensitive and expensive to replace. Never touch this chip without proper grounding.