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IBM 5120 Capacitor Replacement Guide: Revision history

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22 September 2026

  • curprev 01:3501:35, 22 September 2026 Josh talk contribs 12,857 bytes +2,959 Rebuild from IBM SY34-0192-0 and SY34-0193-0: supply is a TSR switcher plus a ferroresonant diskette supply, not linear; removed all 'representative' PSU, deflection and drive tables; added resonant capacitor C4, board A1/A2 split, fuses F2/F3/F4, CB1, rail tolerances and IBM's 60-second restart rule; removed the unrelated IBM 5150 polarity image; cleared Unverified data undo

21 September 2026

23 May 2026

  • curprev 16:4216:42, 23 May 2026 Josh talk contribs 9,878 bytes +9,878 Deep technical pre-PC IBM page with verified sources (Bitsavers MIM/MAP, Wikipedia, IBM Archives) — honest gap disclosure where IBM did not publish per-board cap values
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