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Thanks for your reply, I'm sure you're correct with your suggestions, on reading up on what TVS diode does.
Unforunately I can't seem to find anything listed with those part numbers.
Must look harder through my untidy workshop to try and find origional , or give up trying to repair.
So what? The diagram hasn't been supplied by the manufacturer. It's reverse engineered, I think.But as per diagram the symbol showing a zener.
I was not sure about the diagram whether self drawn or been with the PCB, thats why I assisted. Yes a TVS is a reverse connected two zeners. Yes it can be a TVS and (now after clarification) it is a Bipolar TVS. If this is not connected for the sake of testing it is ok, as it is for safety and connected across the motor.So what? The diagram hasn't been supplied by the manufacturer. It's reverse engineered, I think.