
8. TROUBLESHOOTING
B–64115EN/01
456
Check that the LCD and backlight cables are connected firmly to the
corresponding connectors.
These cables are connected before shipment from FANUC. This check
is, however, required because the cables may be disconnected during
maintenance.
If necessary software is not stored in the FROM module, the CNC may
not start up.
If the main board or display control card is defective or is not correctly
installed, the CNC may not start up.
Check that the card PCBs are engaged firmly with the connectors on the
main board.
If any of the above actions does not solve the problem, replace the display
control card, CPU card, and main board.
Display control
card
CPU card
Main board
NOTE
The MDI block is left out from the drawing.
D Connection of the LCD
and backlight cables
D The necessary software
is not installed
D Defective printed circuit
board
D Installation positions of
the display control card,
and CPU card