
11. TROUBLESHOOTING
B–63525EN/02
752
Check that the power cable is connected to the connector CP1A of the
LCD unit.
Connector for connecting the backlight cable
Inverter printed circuit board
Connector for connecting
the LCD cable
LCD control printed
circuit board
Optical cable
COP20B
24 V input
CP1A
For 24 V branch
CP1B
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 optical cable is free from excessive force and that it is not
excessively bent. Check that the optical cable is connected firmly.
If no problems are found with the connection of the optical cable, replace
the optical 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 stand–alone
type]
D Power supply of the LCD
unit
D LED display
D Optical cable
D Connection on the LCD
unit
D Display control card
D LCD unit