Fanuc 3T Machine alarm issue

[willybuck]

Hi, I have an old Miyano JNC 60 with Fanuc 3T control. A couple of weeks ago, it generated a machine alarm for low air pressure. I do not have the air option on the machine and it does not have air conections or pressure switches. In the machine parameters, the feature is turned off. After trouble- shooting with no success, I called in a fanuc tech to find the problem. He could not fix and said to try a new motherboard. I purchased a new motherboard, installed, same problem. I have another machine the same, swapped out the PC1 and PC2 boards, same problem. Changed relays and swapped out cable from relay panel to PC1/motherboard, same problem. Tried to turn on parameter to say it has air option then jumped the terminals where the pressure switch would hook up if we had it, no success. Would any one have any ideas?

[kcho]

Do you have the ladder of the machine, The low air pressure is a lamp on in the machine's operator panel??

Carlos

[willybuck]

Hi,
Yes I have the ladder, and yes it is a machine alarm light on the panel.
Makes no difference if I turn the parameter on or off for the air blow option, which I do not have.