Problems with Display operation
Maintenance/Troubleshooting
1-47
1.3 Problems with Display operation
1.3.1 The touch panel (switch) does not respond
Is the status LED illuminating in orange?
Cause
The backlight burnout detection function is activated because the backlight is nearly
burnt out. Or, the power supply voltage supplied to the GP is low.
Solution
• When the backlight is nearly burnt out
Replace the backlight. If the problem continues after the replacement, please contact
your local GP distributor. If the status LED illuminates in orange soon after purchase,
please contact your local GP distributor.
• When the power supply voltage supplied to the GP is low
Measure the power supply voltage of each GP unit and adjust it to the value within the
range of “Rated Voltage” specified in the manual or the Installation Guide. If the prob-
lem continues even after the power supply voltage is adjusted, please contact your
local GP distributor.
)
“1.7.2 Contact us!” (page 1-164)
Does this phenomenon occurs with all switches?
Cause
The problem may be in the switch setting.
Solution
• When all switches do not respond
When the same phenomenon occurs with all switches, try the solution in the next sec-
tion “Can the GP enter offline mode?”
• When only specific switches do not respond
(1) An interlock function may be set for the switches. Check the setting.
)
GP-Pro EX Reference Manual “11.7 Using Interlock to Prevent Malfunctions” (page 11-
(2) When the touch is indicated with sound, the switch function is enabled. Find the specified
address and check that the address is set to ON or OFF on the connected device side.
• The backlight burnout detection function monitors the current consumed
by the GP. Depending on the failure type of the backlight, burnout may
not be detected, or may be detected earlier than complete burnout. If
this problem occurs soon after purchase, the GP may be faulty. In such a
case, please contact your local GP distributor.
