Need Help!- X axis .040" off

[NID]

I recently had a servo alarm in my x axis that was traced to a broken wire on the encoder cable (Fanuc 3T controller on a Wasino LG-81) that fried my drive. Today I replaced the cards and got the machine going again. While it was down, I took apart both servo motors and cleaned out the dust from the brushes. This is a gang type lathe with just X and Z axis.

Everything seems to be running ok except that all my dimensions in the x axis are off by about .040" It's as if the whole bed has moved .040" in the + direction. Or as if the machines new home position is off. I can adjust for it but wanted to ask what may have caused this? Any ideas?
Thank you, Jeff

[Al_The_Man]

If the encoder was disturbed, then probably it is because the marker pulse position has changed, this can be corrected if you need to by the grid shift parameter, this adds or subtracts the home position in encoder counts.
Al.

[NID]

Thanks Al. Maybe that's what happened with the encoder. I can live with the new home position if I know I didn't hurt anything and that it's going to stay put at this new position. Sounds like that's the case.