
B–63835EN/03
8.TROUBLESHOOTING
471
If nothing is displayed on the screen at power–up or if the LCD is locked
with “GRAPHIC IS READY.” or the slot status screen displayed, the
probable causes include the following:
D The display unit is not connected to the power supply.
D The CRT video cable, LCD optical cable, or backlight cable is not
connected.
D The LCD unit is not connected to the CNC with the optical cable or
the cable is broken.
D The necessary software is not installed.
D The main CPU board, display control card, or LCD unit printed circuit
board is defective.
D The CRT unit or LCD unit backlight is defective.
If “GRAPHIC IS READY.BOOT START”. is displayed, this indicates
that the display control circuit has started up normally but that the CNC
has not started up.
Make sure the power cable is connected to connector CN2 for the CRT
unit or to connector CPIA for the LCD unit. The power voltage is 24V.
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
8.7
NOTHING IS
DISPLAYED ON THE
SCREEN WHEN THE
POWER IS TURNED
ON
Causes and actions
D Power supply of the
display unit