Problem in our Fanuc 15M control.The problem is that when we power on the machine and after booting the system the machine is working properly but when we change the system mode through Theese four keys from keyboad ( POSTION , PROGRAM , OFFSET , POSITION CHECK ) the system is hang and LED blinking on the PMC-NA , Main - C and Sub-c Cards .if we not touch theese above fours nos. of keys then machine is properly working.
We also changed its DRAM module in PMC-NA card and checked keyboard , cable these are ok. Please suggest us where is the problem.