Sorry Dennis for the late reply.
The EM400 is dual voltage and this does not seem to be the problem.
I have been in contact with several other chaps here that have either the same mount of the NJP. Through their accummulated knowledge I think I have sorted the issue. Albeit that I will do the tests first. I will let everyone know the solution when I find it. Differential flexure combined with guide speed seems to be the real issue here. However, tests first and then I will know for sure.
Thanks so much all for the suggestions and for the help offered.
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