Garmin APOLLO GX SERIES, Service Manual

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© 2004 Garmin AT GX Service Manual 9-1
Chapter 9. Troubleshooting
Note:
When using these tables, check all listed error messages and symptoms before deciding which
to pursue.
Preliminary Data
Prior to performing any repair or testing, fill out the appropriate fields of the Service Data Sheet. A
copy is located at the back of this manual. This will be used when service is completed to reenter
customer configuration and perform final test and inspection.
Error Messages
ERROR MESSAGE CAUSE ACTION
Battery failure message 1. Low battery voltage
2. Fracture between
solder fillet and leads
on battery holder
3. NAV board
1. Check battery voltage. Replace if
below 2.75V. (See Battery
Replacement procedure.)
2. Replace NAV board. (See NAV
board replacement procedure.)
GPS self-test failure 1. GPS receiver board
2. NAV board
1. Initialize unit. (See Complete
Initialization procedure).
2. Replace GPS receiver. (See the
GPS Board Replacement procedure
for the unit.)
3. Replace the NAV board. (See NAV
Board Replacement procedure.)
GPS position sensor
cannot compute LAT/LON
En route GPS RAIM not
available
Terminal GPS RAIM
alarm
1. Insufficient satellites
available
2. GPS receiver board
3. NAV board
1. Ensure 3D fix.
If the problem persists:
2. Initialize unit. (See Complete
Initialization procedure).
3. Check antenna/coax.
4. Replace GPS receiver. (See the
GPS Board Replacement procedure
for the unit).
5. Replace the NAV board (See NAV
Board Replacement procedure).
GPS Communications
failure 1. GPS receiver
2. NAV board
1. Initialize unit. (See Complete
Initialization procedure).
2. Replace GPS receiver. (See the
GPS Board Replacement procedure
for the unit.)
3. Replace the NAV board. (See NAV
Board Replacement procedure.)