I have a Hitachi Seiki HT40 lathe with Seicos Multi Interactive control. I am trying to adjust the X axis backlash. I need to enable parameter 6219 by changing from a zero to a 1. It will not change. It appears I have to set a rotary switch on the main circuit board of the control to allow this change to happen.
I do not have a maintenance manual showing the correct setting to do this. Any ideas?

Thanks,
Bud