Can't zero reurn cobra 42

[Mark and Poco]

I have a cobra 42 lathe with a fanuc 21i-T controller. I had a 307 apc battery alarm, which has been cleared with a new battery. I now have a

300 APC alarm: x axis needs zrn
300 APC alarm: z axis needs zrn

I have tried using a g28 g00 u0.w0. but no luck, also a small start up program included in the book using x#501 ?? etc. no luck

parameter 1240 still has metric coords for a default possition for #1 ref return.

Any help would be appericiated.

[g-codeguy]

Absolute encoders? Do you have to home it on start up? If yes, and no...in that order, then you have to reset home positions. Always reset X-axis first.

[Mark and Poco]

Got the machine up. Had the techs come in

[g-codeguy]

What was the problem? Inquiring minds want to know.