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Interestingly the problem has "evolved" somewhat. Turning it on tonight there's no Dec runaway. Instead, the motor is sounding decidedly "sick".
I've pulled it apart and it seems the motor was quite tight against the main cog. I wonder if it was too tight, there was some movement. Anyhow, not sure how having it too tight would have caused Dec runaway.
Have losened it all off to test the motor's functionality without load.
So at the moment I can turn it on and it's fine, if I move the NS buttons it moves in the direction but is sounding sick and slow.
I'll investigate more in the coming days. At this stage it's looking more and more like a motor issue than a main board or any other of the causes that cause runaway outside of the Dec motor assembly, which is good news to me, I'm sick of replacing main boards!
Roger.
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