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23 September 2026
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02:25 | Recommended Tools 2 changes history +7,999 [Josh (2×)] | |||
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02:25 (cur | prev) +183 Josh talk contribs (Add a topical image (page had none)) | ||||
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02:11 (cur | prev) +7,816 Josh talk contribs (Rewrite and verify every named product: corrected Retro Chip Tester (standalone 8Bit-Museum instrument, not a TL866 add-on) with its real capabilities; corrected ESD mat/strap earthing to require a current-limiting resistor per ANSI/ESD S1.1 (a direct bond to mains earth is dangerous); removed insulated gloves as CRT protection in favour of goggles and the correct discharge tooling; replaced the unsourced 20-50 MHz scope rule with edge-speed reasoning; added sourced solder melting points (Kes...) | ||||
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02:15 | Capacitor Failure Symptoms 2 changes history +12,684 [Josh (2×)] | |||
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02:15 (cur | prev) −40 Josh talk contribs (Remove self-referential wording per house rule) | ||||
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02:07 (cur | prev) +12,724 Josh talk contribs (Rewrite with full citations (Nichicon CAT.8101H hosted here, Vishay 40110, KEMET F3011): corrected 60 Hz hum to twice mains frequency, corrected bulging mechanism to Nichicon gas generation, added missing film/X2 suppression section, added tantalum derating 60-50 percent, added Class II ceramic DC-bias behaviour, replaced Japanese-brand rule with no-datasheet-no-purchase, replaced IPA-only cleanup with Nichicon soap-and-water plus never acidic/alkaline, replaced reforming folklore with Nichic...) | ||||
| 01:36 | Battery Explosion, Capacitor or Corrosion Damage diffhist +12,961 Josh talk contribs (Verification drive: corrected chemistry (Li-SOCl2 half-AA neutralised with bicarbonate not IPA/water; capacitor electrolyte washed not neutralised - no published pH); added cadmium hazard for NiCd; added damaged-cell handling section incl. accurate lithium fire guidance; fixed +5V range 4.75-5.25 V; corrected United Chemi-Con/Nippon Chemi-Con and OS-CON/Panasonic; removed arbitrary '100 ohm' rail threshold and Kapton '400C' claim; added IEC 60086-1 cell designations; all figures now <ref>-cit...) | ||||
22 September 2026
| 17:54 | Sinclair ZX Spectrum Troubleshooting Guide diffhist +13,724 Josh talk contribs (Rebuild from Sinclair ZX Spectrum Service Manual sections 3-9: removed the non-existent 7812/+12V regulator input rail, corrected ROM from 8K to 16K, corrected RESET from edge pin 16 to 20A, corrected ULA Vcc to pin 14; removed unsourced 128K/+2/+3 RAM figures (wrong, and covered by their own pages); added Sinclair basic-check table, memory check and RAM bit-to-IC table, TR4 inverter failure, LM1889 pin signals and self-inflicted faults; refs added; Unverified data cleared) | ||||
| 17:52 | Sinclair ZX Spectrum General Maintenance diffhist +16,120 Josh talk contribs (Rebuild against Sinclair ZX Spectrum Service Manual: ULA Vcc corrected to pin 14 (pin 40 is ground); PSU corrected to 9V centre-negative UK1400 and the wrong "9.0-10.5V unloaded" band removed; -5V test point corrected from TR4 collector to IC6 pin 1; unsourced 10-15 year recap interval, Ray Carlsen PSU and ULA pin 28 audio claim removed; 7K010E removed from the 48K ULA list; broken image and non-existent category fixed; refs added; Unverified data cleared) | ||||
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17:28 | (Upload log) [Josh (2×)] | |||
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17:28 Josh talk contribs uploaded File:Sinclair ZX Spectrum Issue 3 circuit diagram.png (Sinclair ZX Spectrum Issue 3 circuit diagram) | ||||
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17:26 Josh talk contribs uploaded File:Sinclair ZX Spectrum Service Manual.pdf (ZX Spectrum / Spectrum+ Service Manual with Supplements 1 and 2 — source for the Spectrum repair pages) | ||||
| N 17:28 | Sinclair ZX Spectrum Service Manual diffhist +3,470 Josh talk contribs (Create documentation page for the newly hosted ZX Spectrum Service Manual) | ||||
21 September 2026
| 21:53 | Sinclair ZX Spectrum Troubleshooting Guide diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||
| 21:53 | Sinclair ZX Spectrum General Maintenance diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||
| 21:50 | Battery Explosion, Capacitor or Corrosion Damage diffhist +20 Josh talk contribs (Verification drive: flag unverified component data pending check against a primary source) | ||||