Garmin G1000 NAV III Line Maintenance Manual page 77

2.4.2 COM
Symptom
Weak COM transmit
power
Weak COM receiver
No COM sidetone
COM Bleedover
2.4.3 GPS
Symptom
Will not acquire
satellites
G1000 Nav III Line Maintenance Manual
190-00352-00
Recommended Action
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, replace GIA.
o
If problem does not follow unit, check COM antenna and cabling for faults.
o
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, replace GIA.
o
If problem does not follow unit, check COM antenna and cabling for faults.
o
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, replace GIA.
o
If problem persists replace GMA 1347.
o
•
Verify on the GMA CONFIGURATION page that "Disable Split COM" has a
green box. Due to the closeness of the COM antennas and high power of the
COM transceivers, Split COM operation is not approved. If the box is black
(indicating COM ½ button is active), highlight "Disable Split COM" with the curser
and press the ENT key to turn the box green which will deactivate Split COM
mode.
•
On the MFD AUX – SYSTEM STATUS page, see if GIA's are under S/N
46905099. If so, remove GIA's from rack and check if MOD 3 has been
installed. If not, units may be returned to Garmin for installation of Service
Bulletin 0505.
Recommended Action
•
Ensure that a cell phone or a device using cell phone technology is not turned on
(even in a monitoring state) in the cabin.
•
Check date and time on Date/Time Setup Page.
If date and time are incorrect, enter the correct date and time.
o
•
Switch GIA1 and GIA2, to verify location of problem:
If problem follows unit, clear the GPS almanac by performing the following
o
steps –
Using the PFD in config mode, go to the GIA RS-232/ARNIC 429 Config
o
Page.
At the top of the screen, select the GIA that can not aquire satellites
o
(GIA1 or GIA2) and press the ENT key.
Press the "CLR NV" softkey at the bottom of the screen.
o
Select "OK" in the "Clear GIA nonvolatile memory?" pop-up window.
o
Next reload GIA Audio and Config files from a loader card, see Section
o
4.3.3 and on for instructions. Be sure to reload the config files for any
optional equipment installed on the aircraft that require the GIA config to
be updated.
•
Cycle power on the system and allow it to restart in normal mode. Place the
aircraft outside and allow 15-30 minutes for the GPS to acquire a position and
download a new almanac.
If clearing nonvolatile memory is unsuccessful and the GPS still can not
o
acquire a position, replace the GIA.
•
If problem does not follow unit, check GPS antenna and cabling.
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Rev. L