Thanks. OK, sure. However I heard it related that coils can function when the machine is cold, and then play up ii.e. fail to provide a voltage switch to the HT cable) when warmed up. But then start working again when the machine cools. I don't know how common that behaviour is, but it suggests there could be an intermediate state between go/no go, but whether that is a failure of the solid-state switch circuitry embedded in the resin block, or of the primary wire itself I wouldn't have a clue. However due to the high voltages present across the secondary winding and being comprised of much finer wire gauge, I suspect that the primary side is more likely to be reliable 'in principle' and the secondary winding the one subject to failure.
So I would be interested in any other related observations, before making a final decision on what to do in this case . At least the saw is working for now and can be started and run most of the time.I am probably bound to replace the coil module anyway in due course and if so, I'll pull the old one apart to suss out what's happening inside it and add to the knowledge bank.
