Editing Osborne Executive Capacitor Replacement Guide (section)

== Osborne Executive Capacitor Lists ==

The Osborne Executive consists of three main assemblies requiring recapping: the '''power supply''', the '''main logic board''', and the '''CRT video board'''.  
Always cross-check values with your specific revision, as some parts may differ between early and late units.

=== Power Supply Board ===

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|+'''Osborne Executive Power Supply Electrolytic Capacitors'''
! Ref. Designator !! Capacitance !! Voltage !! Notes
|-
| C1 || 220 µF || 250 V || Mains filter (high voltage, safety rated)
|-
| C2 || 10 µF || 50 V || Start-up (bootstrap)
|-
| C3 || 2200 µF || 25 V || +12 V output filter
|-
| C4 || 2200 µF || 16 V || +5 V output filter
|-
| C5 || 470 µF || 25 V || +12 V secondary filter
|-
| C6 || 470 µF || 16 V || +5 V secondary filter
|-
| C7 || 1 µF || 50 V || Control circuit decoupling
|-
| C8 || 1 µF || 50 V || Control circuit decoupling
|}

''Note: Some power supply revisions may use 3300 µF for C3/C4. Always match the installed value or consult the silkscreen.''

=== Main Logic Board ===

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|+'''Osborne Executive Mainboard Electrolytic Capacitors'''
! Ref. Designator !! Capacitance !! Voltage !! Function
|-
| C101 || 10 µF || 16 V || Reset timing
|-
| C102, C103, C104, C105 || 1 µF || 50 V || Local decoupling (various ICs)
|-
| C106, C107 || 22 µF || 16 V || Audio and video path coupling
|-
| C108 || 100 µF || 16 V || Bulk decoupling
|-
| C109 || 47 µF || 16 V || Floppy interface filter
|-
| C110, C111, C112 || 10 µF || 16 V || Miscellaneous decoupling
|}

''SMD electrolytics are not present on original Osborne Executive boards; all are through-hole types.''

=== CRT Video Board ===

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|+'''Osborne Executive CRT Board Electrolytic Capacitors'''
! Ref. Designator !! Capacitance !! Voltage !! Function
|-
| VC1 || 10 µF || 160 V || Vertical deflection coupling
|-
| VC2, VC3 || 22 µF || 50 V || Video signal coupling
|-
| VC4 || 100 µF || 16 V || Video output filter
|-
| VC5 || 1 µF || 50 V || Sync decoupling
|}

''Always verify capacitor polarity on the CRT board—incorrect installation may cause display failure or damage.''