Ok so I was lucky, it was just a blown fuse that I had to replace. I went down a rabbit hole though checking voltages on the board and after a few days I realised that the micro-switch which activates the spindle motor when the mechanism closes and raises was not making and so the voltage wasn’t being sent to start the motor! I must have bent before I shorted the boards.
So with new fuses it all seems ok, I had fine tune the brass knob on top of the main cam – too tight and mechanism wouldn’t raise reliably, too loose and it wouldn’t raise the disc into place high enough. I found that it helps to tighten the grub screw even when testing because the knob can move if it meets any resistance meaning that it is not in the position that you think it was when set.
It’s been an adventure – learned a lot but happy to pass this back to my friend. Now to restore the donor player that I bought 🙂
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