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Amstrad CPC 664 Troubleshooting Guide
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== Diagnosing the Gate Array == Same as the CPC 464. The 664 may have either the 40007 (Ferranti, heatsinked, hot-running) or the 40010 (CMOS, cooler) Gate Array. Symptoms of a failing GA: * '''No clock, no display, system completely dead''' but +5 V and +12 V present and crystal oscillating. * '''Display present with vertical colour bands''' — GA video output intermittently failing. * '''System runs but hard locks after a few minutes''' — GA overheating. Fit or refit a heatsink with thermal compound, or replace with a CMOS 40010.
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