
8. TROUBLESHOOTING
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Referring to the hardware chapter, check the LED on/off status of the main
CPU board.
If the main CPU board has started up normally and the LED display
indicates normal operation, a probable cause is a fault of the display
system, such as the cable of the LCD unit not connected or a defective
inverter board.
If the LED display is locked in the middle of the startup process, the
probable causes include defective hardware (or installation failure) and
the necessary software not installed.
Check that the connection cable (video cable for CRT or optical cable for
LCD) is free from excessive force and that it is not excessively bent.
Check that the connection cable is connected firmly.
If no problems are found with the connection of the connection cable,
replace the connection cable.
Check that the backlight and LCD 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.
Check that the display control card installed on the main CPU board is
engaged with the connector. If it is engaged properly, replace this card.
Replace the LCD unit or the control printed circuit board located at the
rear of the LCD unit.
For the LCD unit, make sure the backlight is turned on. If it is not turned
on, replace it with a new one. See Section 2.14 for details.
If any of the above actions does not solve the problem, replace the main
CPU board and the CPU card.
D LED display
D Connection cable
D Connection on the LCD
unit
D Display control card
D LCD unit
D Backlight
D Main CPU board