Yaskawa YASNAC PC NC Maintenance Manual - Manual (Page 190)

PC NC Maintenance Manual Chapter 6: Module/Unit Replacement
6-8
6. Verify that the NC operates normally after the SERVO ON switch
is pressed and no alarms show on the MMI screen.
7. Determine whether there are any CPU rack fan related alarms.
8. Wait a few minutes and then check the CPU Monitor screen on
the MMI to determine whether the CPU temperature is within the
normal range (i.e., below 30°C).
9. Check the CPU Monitor screen on the MMI to determine whether
the CPU rack fan is working properly. The fan speed readout
should be approximately 2500rpm.
10. Verify that the NC starts the shut-down sequence after the SHUT
DOWN switch is pressed.
6.2 CRT Display Unit
14” Color CRT
Remove the CRT display unit as follows.
1. Verify that the main power is off.
2. Remove all connectors and wiring from the back of the display
unit.