Editing Atari 400 Capacitor Replacement Guide (section)

== Capacitor list ==

=== Power supply PCB (CA014155) ===

This board carries the mains-derived circuitry, both regulators, the RF modulator and the power and interlock switches. Seven of the machine's eight electrolytics are here.<ref name="fsm" />

{| class="wikitable styled-table" style="width:90%; text-align:center;"
|+ Atari 400 power supply PCB electrolytic capacitors
! Designator !! Value !! Rating !! Package !! Atari part number
|-
| C201 || 470 µF || 16 V || Axial || C014370
|-
| C202 || 470 µF || 16 V || Axial || C014370
|-
| C204 || 2200 µF || 16 V || Axial || C014373
|-
| C205 || 2200 µF || 16 V || Axial || C014373
|-
| C207 || 10 µF || 16 V || Axial || C014371
|-
| C209 || 4700 µF || 16 V || Radial || C014374-01 or C014374-02
|-
| C210 || 22 µF || 16 V || Axial || C014393
|}

The remaining capacitors on this board are not electrolytics and should be left alone unless they test faulty: C203, C208 and C211 are 0.22 µF polyester film (C010394), C206 is 0.1 µF ceramic and C212–C213 are 0.001 µF ceramic.<ref name="fsm" />

=== Motherboard (CA014807) ===

{| class="wikitable styled-table" style="width:70%; text-align:center;"
|+ Atari 400 motherboard electrolytic capacitors
! Designator !! Value !! Rating !! Package !! Atari part number
|-
| C192 || 10 µF || 16 V || Axial || C014371
|}

C192 is the only aluminium electrolytic on the 400 motherboard. Everything else in the C101–C203 range is ceramic (0.001 µF, 0.01 µF, 0.1 µF, or small NP0 values), mylar (C135–C142 and C181 at 0.047 µF) or polyester (C177–C178 at 820 pF).<ref name="fsm" />

=== CPU and RAM cards ===

'''Neither plug-in card contains an electrolytic capacitor.''' C301–C307 on the CPU card and C501–C523 on the RAM card are all ceramic axial types.<ref name="fsm" /> If someone has sold you a "400 cap kit" containing parts for these cards, it is not a 400 kit.

The Console5 Tech Wiki capacitor list for the 400 agrees with Atari's parts list exactly — the same eight designators at the same values.<ref name="c5">[https://wiki.console5.com/wiki/Atari_400 "Atari 400"], Console5 Tech Wiki, retrieved September 2026. Secondary source; its capacitor list matches Atari's own parts list designator for designator, and it additionally identifies A201 as a 7812 and A202 as a 7805.</ref>