G1000/GFC700 System Maintenance Manual – C90A/C90GT/C90GTi King Air Page 5-47
190-00682-01 Revision F
5.8 GDU 104X Troubleshooting
5.8.1 GDU 104X Common Problems
Symptom Recommended Action
Display is blank
• Ensure that a cell phone or a device using cell phone technology is not
turned on (even in a monitoring state) in the cabin.
• Cycle power.
9 If GDU recovers, observe display for yellow text containing error
information at the top of the screen. If message indicates software
need to be re-loaded, then re-load software. Otherwise, replace
the GDU.
• Use a bright light to verify LCD is active.
9 Adjust avionics dimmer control full clockwise.
9 Manually turn up backlight on the PFD and load configuration files
to the GDU.
• Ensure slide lock is fully engaged with the locking tabs on the back of
the unit.
9 If slide lock is not fully engaged, remove connector and verify the
locking tabs on the GDU are perpendicular to the connector. If
necessary, straighten them before reseating connector.
• 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.
9 If problem follows unit, replace the display. Please note the
position it failed in (PFD1/2).
9 If problem does not follow unit, troubleshoot aircraft wiring for fault.
Display resets
Display flickers
SD card is stuck in GDU
• 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.
9 Remove all but one label.
• Ensure the SD card is from Cactus or 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 Garmin for repair.
A button/knob/joystick does not
appear to function
• 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.
9 If problem is verified, replace GDU.
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