I have a problem with the signal generador of my cnc plasma cutting system.
The problem consists in:
When I power on the signal generador, all the 5 axis lights should light up, but all the lights remain ignited all the time whereas the normal function they must light up in sequence (1, 2, 3, 4, and then 5) and then all shut off.

The model of the signal generatos is: 501A
And the serial number is: 210027

I need your sugestión for solve my problem.