Garmin G1000 Nxi System Maintenance Manual page 196

Symptom
Display flickers
SD card is stuck in GDU
A button/knob/joystick does not
appear to function
Terrain/Obstacle/SafeTaxi does not
display
Display will not track dimmer bus
Keyboard will not track dimmer bus
G1000 NXi System Maintenance Manual
King Air 300 Series
190-00716-N1
Recommended Action
•
Ensure GDU is receiving power. If a circuit breaker is tripped, determine
source of short before resetting breaker.
•
Ensure circuit breakers have not failed and power wire connections are secure.
•
Swap PFD1 and PFD2.

If problem follows unit, replace the display. Please note the position it
failed in (PFD1/2).

If problem does not follow unit, troubleshoot aircraft wiring for fault.
•
DO NOT insert a screwdriver of any length into the card slot.
•
DO NOT pry against the overlay.
•
DO NOT force the SD Card out.
•
Use a small screwdriver in the groove on the side of the exposed end of the
card to help pull out the card.
•
Push the card in further to release the card locking mechanism.
•
Check SD Card for having more than one label. Two or more labels on the
card will cause sticking.

Remove all but one label.
•
Ensure the SD card is from SanDisk. Use of other SD Cards is not
recommended.
•
If card was inserted with the label facing to the right, do not attempt to remove.
Return the unit to an authorized repair facility for service.
•
Go to the GDU TEST page in configuration mode and verify button, knob, or
joystick operates correctly by observing a change in color from red to green in
the button/knob/joystick icon when the button/knob/joystick is pressed. If a
button is stuck, the button icon will be green without pressing the button as
soon as you turn to the GDU TEST page.

If problem is verified, replace GDU.
•
Allow the system to verify the data in internal memory for approximately five
minutes after power-up.
•
If a database does not activate, reload the problem database.
•
Reload GDU configuration files.
•
If display is a PFD, swap PFD1 and PFD2 to see if problem remains with
display.
 Replace display if condition remains with the same unit.
 If condition remains in original position after swapping displays, check GDU
dimmer input to verify voltage is present.
•
If display is the MFD, check dimmer input to verify voltage is present.

Replace MFD if dimmer voltage is present.
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