Editing Apple Extended Keyboard II (section)

== Common Issues and Solutions ==

=== Mechanical Problems ===

{| class="wikitable" style="width:90%; text-align:center;"
|+'''Troubleshooting Guide'''
! Problem !! Cause !! Solution !! Difficulty
|-
| Adjustment bar stuck || Plastic deformation || Disassemble and lubricate mechanism || Moderate
|-
| Key chatter/repeat || Switch contact oxidation || Clean with isopropyl alcohol || Easy
|-
| Dead keys || Failed switch || Replace individual switch || Moderate
|-
| Stabilizer rattle || Worn clips || Replace stabilizer clips || Moderate
|-
| Case yellowing || UV exposure, brominated flame retardants || Retrobright treatment || Moderate
|-
| ADB not recognized || Cable damage || Test continuity, replace cable || Difficult
|-
| Intermittent connection || Corroded ADB pins || Clean with contact cleaner || Easy
|}

=== Adjustment Mechanism Restoration ===
The height adjustment mechanism commonly seized due to plastic stress:
# Remove bottom case screws
# Extract spring from adjustment bar
# Apply silicone lubricant to pivot points
# Work mechanism repeatedly to distribute lubricant
# Reassemble with spring properly seated

=== Switch Maintenance ===
'''Basic cleaning:'''
# Remove keycap with wire puller
# Apply 3-5 drops 90%+ isopropyl alcohol
# Actuate switch 20-30 times
# Allow 10 minutes evaporation
# Test and repeat if necessary

'''Deep cleaning (requires desoldering):'''
# Desolder switch from PCB
# Open housing (4 retention tabs)
# Clean contacts with alcohol
# Inspect spring and leaf condition
# Apply dielectric grease to slider rails
# Reassemble and test before resoldering