Editing Atari 800XL General Maintenance (section)

== Capacitor Health & Replacement ==

While the Atari 800XL is less prone to catastrophic capacitor failure than some contemporaries, electrolytic capacitors do degrade.

=== Common Capacitors to Replace ===
* '''C56, C57, C58, C59''': 100µF/16V (power rail filters)
* '''C61''': 220µF/16V (SIO power filter)
* '''C37, C38, C39''': 1µF/50V (audio and video coupling)
* '''C55''': 470µF/16V (input smoothing)

{| class="wikitable styled-table" style="width:80%; text-align:center;"
! Location !! Value !! Function !! Symptom of Failure
|-
| C56, C57, C58, C59 || 100µF/16V || Power rail filters || Random lockups, video glitches
|-
| C61 || 220µF/16V || SIO power filter || SIO device errors, instability
|-
| C55 || 470µF/16V || Input smoothing || Won't power on, resets
|-
| C37, C38, C39 || 1µF/50V || Audio/video coupling || Distorted sound, weak video
|}

* Replace with high-quality low-ESR electrolytics rated ≥ 105°C.
* Inspect for bulging, leakage, or crusty residue around capacitor bases.
* If replacing, observe correct polarity and orientation.