I own a turning center with a 3 tc. The control power supply stopped working about a year ago and I just got a used one about a week ago. I installed it and the control came to life but not without it issues. First I had working memory parity problems so I dumped the memory and mdi the parameters in. This got rid of the memory problems but now the latch relay built into the power supply is not working. I would like to know how this works. I have tested all output voltages from the power supply and they are with in limits stated in the manual. I even turned the 5 volt pot up to get it closer to 5 volts. No luck I would like to know if the 5 volt logic signal for the latch relay comes back from the control? The machine will not do anything it tells me on the crt not ready. I can't find out much about this in the manual. I am guessing that is has something to do with the latch relay not stating kicked in. I can make the control stay on without the latch relay by holding the enable button on the front of the machine in. That is when it tells me not ready. So if there are any Fanuc service guys that read this please let me know what you think. I can get to the ladder so I should be able to see inputs and outputs. Also I have looked at the E stop input and it is low so I am guessing that it is not that. Any ideas will help me out so please responde if you know anything about this. Thank you for your time and hope to hear from you very soon. I would love to fix this problem as this lathe is a really good machine.