Hi there;
We have a Fanuc 6M machine which is faulty now.
We get the alarm "401 servo" message .
Please let me know how to overcom this problem.I have checked all the cables and connectors ans fuses on the system.
The 2 green LEDs on the T axis board (on the back of the machine) are OFF all the times.The 18 VAC is OK on T board.
The relay beneath the board will not be active in any case while the relays for X and Y axis are activated for a moment before alarm.(Is this a any sign that how to track the problem?)
Any hint or clue is highly appreciated.
Best regards
SBP