Editing Atari Portfolio Capacitor Replacement Guide (section)

== Post-Replacement Testing ==

After replacing capacitors:

# Reassemble and insert fresh batteries
# Verify the unit powers on and displays the DIP DOS prompt
# Check LCD contrast range — adjust the contrast potentiometer and verify full range of adjustment
# Test the memory backup: save a file to C:, remove batteries, wait 30 seconds, reinsert batteries — the file should still be present (verifying C7 supercapacitor function)
# If using expansion modules, verify they are detected
# Run the built-in applications (editor, spreadsheet, calculator) to verify stable operation