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Fault on three phase Betapack 1


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A fault developed last week in one of our Betapack 1's. Channels 5 & 6 both flickered briefly and then came on full. Removing the control signal has no effect.

 

What could be the problem and is it easy to fix? I suspect either the thyristors or more likely an internal fuse. However, I have no service manual and am reluctant to go poking about inside. I am a qualified electrical engineer and can safely service the equipment if I have a manual or circuit diagram.

 

John

 

Isle of Arran

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