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Slight OT - sorry for that - i see that there is 7474 on board - seem that HD Amiga drives use additional divider by 2 to achieve 150 RPM - is there anywhere available schematics for Chinon FZ-357A?
And i would check HD switch (like demolition says) - perhaps it is corrupted and signaling constantly HD mode i.e. 150 instead 300 RPM
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