Started by vasilisk, 13:25, 16 February 21
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Quote from: Bryce on 13:52, 16 February 21Either a problem with the flat cable or the driver IC (74LS38) has failed.Bryce.
Quote from: Bryce on 14:27, 16 February 21You can check whether the STEP signal is being sent from the chip and if it is, trace the signal to find out where it's not getting any further.Bryce.
Quote from: Bryce on 16:00, 16 February 21A scope would be best, but it's slow enough to check with a multimeter.Bryce.
Quote from: Bryce on 17:46, 16 February 21Ok, it should go low (0V) each time it needs to step (move) the head.Bryce.
Quote from: Bryce on 18:01, 16 February 21Then that chip needs to be swapped.Bryce.
Quote from: Bryce on 19:18, 16 February 21IC206 is the same chip and also responsible for signals to the FDD, but it performs different tasks, so you can't compare pin results.Bryce.
Quote from: Bryce on 23:41, 16 February 21All of the through-pin ones in that list are fine. Buy two. If you're going to take out 208, you might as well swap 206 while you're there.Bryce.
Quote from: Bryce on 00:04, 17 February 21No, it's unlikely to be a voltage issue. If the 5V rail couldn't turn the motor, the voltage would drop and the CPC would crash.As for fakes, you've no worries with this part. They are still produced in masses and are low cost. There would be no profit in cloning them.Bryce.Edit: I'd pay more for local parts. Shipping from China is extremely slow at the moment. You could be waiting months for them to arrive.
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