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Amstrad CPC 464 Troubleshooting Guide
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=== Keyboard not working / dead keys === # Verify CP002 keyboard ribbon is firmly seated. # Inspect the keyboard contact PCB (parts 170028/170029) for cracks, liquid spillage or distortion. # If a single row or column is dead: trace the corresponding line back through the keyboard ribbon to the main PCB. IC101 (74LS145) decodes the row select; IC109 / IC113 (74LS153 dual 4-to-1 mux) read the column lines into the 8255 PIO. # If a single key is dead: clean the carbon pill on the rubber dome and the matching pad on the membrane. Do not abrade the carbon pill; it is a conductive coating that wears off if scrubbed. # Stuck keys: open the keyboard, look for liquid residue between two adjacent membrane traces. Clean with IPA.
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