Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 260)

Chapter 8: Fixed File Operations PC NC Maintenance Manual
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9. Touch the Close button. Touch the Enable/Disable CD-ROM
button and uncheck the Enable check box.
10. Select the Close button. If the external CD enable switch is not
turned off, the PC NC displays a Windows NT error during the
next startup.
11. Select the Shut Down switch and power OFF the PC NC.
12. Change the JFC10 system number switch to ‘0’.