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Amstrad CPC 664 Troubleshooting Guide
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== Common Fault Catalogue == * '''Drive belt failure''' — 80%+ of 664 floppy faults. Replace the 54 × 1 mm flat rubber belt. * '''Stepper lubrication dried''' — "Track 0" errors. Single drop of clock oil. * '''Disc head dirty''' — CRC errors on read. IPA on foam swab. * '''AMSDOS ROM socket loose''' — "Bad command" on | commands. Reseat. * '''Gate Array overheating''' — system runs then locks. Fit heatsink or swap to CMOS 40010. * '''RAM failure''' — vertical stripe at boot. Identify bit, swap chip. * '''Power supply +12 V failing''' — drive does not spin even with new belt. Verify +12 V at drive connector. * '''Volume control noisy''' — VR301 needs cleaning. * '''Speaker quiet''' — aged C309/C311/C314 (1 ยตF/50 V on AY output). Recap.
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