Garmin SA01456Wi_D Manual Page 171

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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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