Editing Atari STE Capacitor Replacement Guide (section)

== Motherboard Capacitor List ==

The following list covers both known STE motherboard revisions: '''CA401177''' and '''CA4003290'''.<ref name="console5">{{cite web |url=https://wiki.console5.com/wiki/Atari_ST |title=Atari ST Cap Lists |publisher=Console5 TechWiki |access-date=2026-03-27}}</ref> Some minor value differences between early and late boards are noted.

<templatestyles src="Template:StyledTable/styles.css" />
{| class="wikitable styled-table"
! Ref. Designator !! Capacitance !! Voltage !! Type !! Circuit Area / Notes
|-
| C100 || 10 µF || 35V || Electrolytic || Power filtering
|-
| C102 || 22 µF || 16V || Electrolytic || May be 10 µF / 35V on some early boards
|-
| C103 || 4700 µF || 16V || Electrolytic || Main +5V bulk filter — large radial cap
|-
| C107 || 100 µF || 16V || Electrolytic || Power filtering
|-
| C110 || 100 µF || 16V || Electrolytic || Power filtering
|-
| C202 || 4.7 µF || 35V || '''Non-polarised''' || Audio path
|-
| C204 || 4.7 µF || 35V || '''Non-polarised''' || Audio path
|-
| C205 || 4.7 µF || 35V || '''Non-polarised''' || Audio path
|-
| C215 || 4.7 µF || 35V || '''Non-polarised''' || Audio path
|-
| C216 || 470 µF || 35V || Electrolytic || Audio output — main coupling cap
|-
| C415 || 470 µF || 16V || Electrolytic || Power filtering
|-
| C416 || 47 µF || 16V || Electrolytic ||
|-
| C417 || 100 µF || 16V || Electrolytic ||
|-
| C423 || 100 µF || 16V || Electrolytic ||
|-
| C433 || 1 µF || 50V || Electrolytic ||
|-
| C508 || 47 µF || 16V || Electrolytic ||
|-
| C520 || 47 µF || 16V || Electrolytic ||
|-
| C525 || 47 µF || 16V || Electrolytic ||
|-
| C529 || 47 µF || 16V || Electrolytic ||
|-
| C535 || 47 µF || 16V || Electrolytic ||
|-
| C537 || 47 µF || 16V || Electrolytic ||
|-
| C541 || 47 µF || 16V || Electrolytic ||
|-
| C542 || 10 µF || 35V || Electrolytic ||
|-
| C543 || 47 µF || 16V || Electrolytic ||
|-
| C544 || 47 µF || 16V || Electrolytic ||
|-
| C546 || 47 µF || 16V || Electrolytic ||
|-
| C547 || 47 µF || 16V || Electrolytic ||
|-
| C558 || 100 µF || 16V || Electrolytic ||
|-
| C561 || 100 µF || 16V || Electrolytic ||
|-
| C564 || 100 µF || 16V || Electrolytic ||
|-
| C566 || 47 µF || 16V || Electrolytic ||
|-
| C567 || 47 µF || 16V || Electrolytic ||
|-
| C600 || 100 µF || 16V || Electrolytic ||
|}

'''Total: 32 electrolytic capacitors''' on the STE motherboard.

=== Non-Polarised Capacitors ===

Four positions (C202, C204, C205, C215) require '''non-polarised''' (bipolar) electrolytic capacitors. These are in the audio output path and must not be replaced with standard polarised electrolytics. Console5 cap kits include radial bipolar electrolytics for these positions.<ref name="console5"/> Alternatively, film capacitors of the appropriate value can be used.

=== Key Capacitors ===

* '''C103 (4700 µF, 16V):''' This is the main +5V bulk filter capacitor and is physically the largest cap on the board. Its failure is the most likely single cause of instability. Replace with a quality low-ESR part.
* '''C216 (470 µF, 35V):''' Main audio output coupling capacitor. Failure causes distorted or absent audio output.
* '''C202, C204, C205, C215 (4.7 µF, 35V NP):''' Audio path non-polarised caps. Deterioration causes audio distortion and channel imbalance.