Fault in illumination of microscope vintage Zeiss

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    I have a 40 year old Zeiss AxioLab RE microscope which has been my working horse and faultless for so many years.


    Now I have this fault, where when I increase light up to about mark 5 it works fine, but as I increase the power more (to mark 6), the light dims to about level 2. It is not a big issue but maybe it is a known fault and I can inform my electronics friend what needs to be replaced (leaky capacitor in PSU ?)


    Thanks

    Yes it is a possible cause, I can spray some contact cleaner inside the potentiometer.

    It can also be in the PSU, current not being delivered at high setting.


    Thanks for your opinion !

    Regards

    Stephen