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Sinclair ZX Spectrum Troubleshooting Guide: Revision history

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22 September 2026

  • curprev 17:5417:54, 22 September 2026 Josh talk contribs 20,844 bytes +13,724 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 undo

21 September 2026

12 May 2025

4 May 2025

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