Editing Atari 400 Capacitor Replacement Guide (section)

== Atari 400 Capacitor List ==

The Atari 400 uses a modest number of electrolytic capacitors, all of which are through-hole types on the mainboard and power supply board. SMD electrolytics are not present in this model.

=== Mainboard Electrolytic Capacitors ===

{| class="wikitable styled-table" style="width:100%; text-align:center;"
|+'''Atari 400 Mainboard Electrolytic Capacitors'''
! Ref. Designator !! Capacitance !! Voltage !! Function / Notes
|-
| C44 || 2200 µF || 16 V || Main +5 V rail smoothing (bulk filter)
|-
| C43 || 470 µF || 16 V || +12 V rail smoothing (video/audio circuits)
|-
| C42 || 47 µF || 16 V || +5 V local decoupling (logic)
|-
| C41 || 10 µF || 16 V || +5 V local decoupling (logic)
|-
| C40 || 10 µF || 16 V || +5 V local decoupling (logic)
|-
| C39 || 1 µF || 50 V || Video output coupling
|-
| C38 || 1 µF || 50 V || Audio output coupling
|}

''Note: Some board revisions may use slightly different reference numbers—always cross-check with your silkscreen before ordering.''

=== Internal Power Supply Board ===

If your Atari 400 has the original internal linear power supply (NTSC models), it contains additional electrolytic capacitors:

{| class="wikitable styled-table" style="width:80%; text-align:center;"
|+'''Atari 400 Power Supply Board Electrolytic Capacitors'''
! Ref. Designator !! Capacitance !! Voltage !! Function
|-
| C1 || 4700 µF || 16 V || Main input filter (rectified DC)
|-
| C2 || 1000 µF || 16 V || +12 V rail filter
|}

''PAL models (with external power bricks) may not have these internal capacitors. Always inspect your specific unit.''