Yam CK2 problem

Hi all:
Recently we have buyed a YAM CK2 (Fanuc 6T) lathe in an auction, of
course... no manual,no schematic,no anything...
The lathe work fine a couple of months, but today awake with an error.
The command panel is
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At power on the red light turn on, stopping all function.
What mean this light?
Any help will be welcomed.
Best regards.
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Remove the RED bulb....
IF its an emergency fault interrupt, then simply trace the line--all switches /sensors are in a series configuration....
In the absence of any schematics, a good place to start is at the actual emerg stop switch--trace the circuit both ways from there.
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