[roni21702]

I have a lathe with a Fanuc 3TC control. I started a few days ago and the crt does not come up it just stays black. Anyone have any ideas on what could be wrong. How do I test the power supply? What would happen if the memory batteries are dead. I have not replaced the batteries since I have had the machine going on 3 years.

[Al_The_Man]

What you have to find out is if the machine still seems to operate normally, if it comes out of e-stop for e.g. and if other functions appear to work,if it does then the monitor itself is probabally bad.
Al.

[roni21702]

I have been testing the machine today and I found out that the power supply does not have any voltage at the input. The machine is a Leblond Makino which was made by Gildemeister. Anyone have any ideas on why this would be.

[Al_The_Man]

You will need the control prints for the machine to do any systematic trouble shooting, is there power on the multi-tap transformer R & S connections? does anything pick up when you operate the system on push button? If the power to the supply comes on briefly and then shut off, remove the +24v connections on the power supply and see if the CRT comes up, if so it is probabally a short on the 24v somewhere.
Edit: I just noticed this is a duplicate thread (chair)
Al.

[roni21702]

There is no power at the input to the power supply. I have chased the wires back to X30 relay. I would like to know what gives this power?

[roni21702]

I have been doing more testing tonight. I have found out that the X30 relay feeds the control power supply. The machine side of this relay is hot but not the power supply side. I need to find out what fires the relay and why it is not being fired. Any ideas? I am having a hard time reading the prints because they are in German.