Wow, I have only just found this, now 10 year old thread if immense TB6560 knowledge.

I’m glad I have though as I bought a CNC water jet table that has been rebuilt using this driver board. The board that is in it isn’t working currently. It appears that some of the capacitors and FB307 diodes got too hot. I have a new board on the way but I’m also working through the current board with a multi meter and replacing what I can find that’s bad si I have a backup board.

This thread is going to be a huge help....