User`s guide

Hardware
Mitsubishi Electric, MA00758A 57
3.11 Fault Tracing
You can use the following fault tracing list to fault trace the operator panel. The table
below consists of different fault scenarios and steps to follow to trace the fault
Scenario Fault tracing steps
The operator panel is
not working properly.
Power LED is off.
1.
2.
3.
4.
5.
Is the power voltage correct?
Does the power supply deliver enough current?
Check the fuse.
Check the power card.
Is the power card correctly mounted?
The operator panel is
not communicating with
the controller.
1.
2.
3.
4.
Check the communication cable between the units.
Check that the operator panel has a controller driver
downloaded.
Check that the correct controller driver is used.
Check the communication ports on the CPU board.
The operator panel is
working but the back-
light is off.
1.
2.
3.
4.
Check the backlight dimming.
Check that the backlight is connected to the power card.
Replace the backlight according to the Replacing the Backlight
section.
Check the DC/AC on the power card.
The operator panel is
not working, the back-
light is off but the
power LED is on.
1.
2.
3.
Check the backlight dimming.
Check the CPU board for burned components.
Download new firmware to the operator panel.
The operator panel does
not include the latest
firmware.
1.
2.
3.
Check the versions included with the operator panel.
Make sure that a copy of the project is saved to the computer.
Download an updated image with the Image Loader and follow
the directions.
The operator panel is
working, but one or
more keys are not work-
ing.
1.
2.
Check that the flex cables are correctly fitted.
Replace the front according to the Replacing the Rear Cover
section.
The touch screen is mal-
functioning or is not
responding at all.
1.
2.
3.
4.
Re-calibrate the touch screen according to the Calibrate the
Touch Screen section.
Check that the flex cable is correctly fitted.
Replace the display of the operator panel according to the
Replacing the Display/Display Cable section.
Check the touch interface on the power card.
Lines in display has
wrong color or the dis-
play picture is shifted.
1.
2.
3.
Check if the display has a wide vertical or horizontal area across
the display. It should be at least 2-3 cm wide with a grey or
black color. See Replacing the Rear Cover for instructions on
how to correct this.
Make sure the display cable is correctly fitted.
Make sure the display cable is not folded or damaged in any way.
Replace the display cable according to the Replacing the Dis-
play/Display Cable section.
The operator panel will
not restart after chang-
ing a component.
1. Remove and insert the battery again.
(This is only valid for panels with an external battery cover.)
Low battery/
No battery
1.
2.
Check that the battery is correctly fitted in its holder.
If low battery/no battery voltage, replace the battery according
to the Replacing the Battery section.