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24 September 2026
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22:15 | IBM System/23 Datamaster Capacitor Replacement Guide 2 changes history −4,227 [Josh (2×)] | |||
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22:15 (cur | prev) +268 Josh talk contribs (Add lead image) | ||||
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22:15 (cur | prev) −4,495 Josh talk contribs (Rewrite: every capacitor table on this page was self-labelled representative and described a linear supply the machine does not have - IBMs manual shows a ferroresonant supply with resonant capacitor C6 and no series-pass regulators. Tables removed. Replaced with IBMs real voltage tolerances, peak-to-peak ripple limits, per-rail fuse ratings and ripple measurement method, the two capacitors IBM does identify (C6 and the diskette motor run capacitor, neither valued), and the memory-card decoup...) | ||||
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22:15 | IBM System/23 Datamaster Maintenance Guide 2 changes history +4,901 [Josh (2×)] | |||
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22:15 (cur | prev) +240 Josh talk contribs (Add lead image) | ||||
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22:15 (cur | prev) +4,661 Josh talk contribs (Fix refs so they render; the supply is ferroresonant with an 800 Vac DANGER notice, not linear with series-pass regulators; replace the invented symmetric rail table with IBMs tolerances, ripple limits and fuse ratings; add IBMs meter-and-capacitor ripple method and the service-position grounding check; CRT size settled at 12 in from IBMs manual; remove the unsourced 12-15 kV anode figure; add the diskette motor run capacitor discharge warning) | ||||
| 22:15 | IBM System/23 Datamaster Troubleshooting Guide diffhist +4,574 Josh talk contribs (Fix refs so they render; replace the PID-1200 table with IBMs own index of routines including the critical/not-critical column - codes 36 to 3E are NOT critical so the machine does not halt on them; add the display-attribute meanings, the pre-CRT hardware error latches, the TRAP rule (fault is in the routine AFTER the last displayed), the 25-35 s run time and the two CE jumpers) | ||||
| 22:15 | IBM System/23 Datamaster diffhist +4,891 Josh talk contribs (Fix refs so they render; IBMs own SY34-0171-0 now hosted: the power supply is FERRORESONANT with resonant capacitor C6 and an 800 Vac internal hazard, not linear; add IBMs rail tolerances, ripple limits and per-rail fuses; correct the diskette capacities (0.25 MB and 1 MB per drive, not 1.1/2.2) and the 5246 (up to 2 MB, not 4.4); add IBMs full 110-144 model table; the CRT is 305 mm (12 in)) | ||||
| 22:10 | Upload log Josh talk contribs uploaded File:IBM 5322 Computer Service Manual SY34-0171-0.pdf (IBM's own CE manual for the System/23 Datamaster's 5322 computer) | ||||
22 September 2026
| N 01:28 | IBM 5120 Maintenance Information Manual diffhist +2,351 Josh talk contribs (Create documentation page for newly hosted IBM field service manual (RTC verification drive)) | ||||