I'm deep into the retrofit of my Hurco SM1 that used to have a BX control and I seem to be having a low voltage problem on the 5 volt bus. I'm trying to reuse the 5V and 24V power supply. 5V bus is 4.8 volts, and the return from the limit switches are 4.3 or lower. Occasionally the limit switch won't switch, off the 5V output off. I believe the 5V bus isn't high enough. Is there an adjustment or do I need to just gut the 5V power supply now too? Admittedly I've selected only a few of the 5V regulators, I suppose I could check the other 4 or more regulators, but if there's an adjustment... well, that would be easier.

Thank you in advance.