Garmin Cirrus Perspective SR20, Руководство по линейному обслуживанию

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Cirrus Perspective™ Line Maintenance Manual Page 5-45
190-00920-00 Rev. E
5.6 GDU RELATED ALERTS AND PROBLEMS
5.6.1 General Problems
Symptom Recommended Action
Display will not track
photocell
•
Go to the GDU TEST page in configuration mode. Cover and
uncover the photocells and make sure that PHOTOCELL A or
PHOTOCELL B value changes.
−
If values do not change, replace the display.
•
Reload GDU configuration files.
Keyboard will not track
photocell
Display will not track dimmer
bus
•
Reload GDU configuration files.
•
Swap PFD or MFD 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 for the presence of
voltage.
Keyboard will not track
dimmer bus
Display is blank
•
Make sure a cell phone or a device using cell phone technology is
not turned on (even in a monitoring state) in the cabin.
•
Cycle power.
•
If GDU recovers, observe display for yellow text containing error
information at the top of the screen. If message indicates that
software needs to be reloaded, then reload software. Otherwise,
replace the GDU.
•
Use a bright light to make sure the LCD is active.
•
Adjust avionics dimmer control fully clockwise.
•
Manually turn up backlight on the PFD and load configuration
files to the GDU.
•
Make sure the slide lock is fully engaged with the locking tabs on
the back of the unit. If slide lock is not fully engaged, remove
connector and make sure the locking tabs on the GDU are
perpendicular to the connector. If necessary, straighten them
before reseating connector.
•
Make sure the GDU is receiving power. If a circuit breaker is
tripped, determine source of short before resetting breaker.
•
Make sure the circuit breakers have not failed and power wire
connections are secure.
•
Swap PFD or MFD.
•
If problem follows unit, replace the display. Please note the
position it failed in (PFD OR MFD).
•
If problem does not follow unit, troubleshoot aircraft wiring for
fault.
Display resets
Display flickers