Garmin GPS 400W Installation Manual page 131

Alert Text
Loss of integrity — cross-check
NAV
Low Battery - Unit Needs Service
MAIN processor requires service
No altitude input is being
received
No basemap data available
Not receiving input data on 429
Channel #1 or #2
Not receiving input data on 232
Channel #(1 through 5)
Not receiving traffic data
OBS key stuck
400W Series Installation Manual
190-00356-02
Possible Cause
Improper antenna installation or
coax routing
Antenna shaded from satellites
RF interference at 1575.42 MHz
from VHF COM.
Time data may have been lost
due to a memory battery failure.
The 400W-series unit has
detected a failure in the main
system processor.
No altitude data is being
received from RS-232
(Serializer: Icarus, Rosetta or
Shadin) or grey code inputs.
The 400W-series unit has
detected a failure in the built-in
basemap (land data) memory.
Land data does not appear on
the Map Page. Other unit
functions continue to work
normally.
No data has been received on
the ARINC 429 channel #1
connection for a period
exceeding five seconds.
No data has been received on
one (or more) of the RS-232
channel connections for a
period exceeding ten seconds.
No traffic data is being received.
The OBS key is stuck in the
enabled (or pressed) state. Try
pressing the OBS key again to
cycle its operation.
Solution
Check GPS antenna
installation, connections, and
cable routing. The GPS
antenna must be mounted on
the top of the aircraft.
Make sure the aircraft is clear
of hangars, buildings, trees,
etc.
Move GPS antenna further
from the COM antenna, Add a
1575.42 MHz notch filter in
COM coax. Fix or replace the
COM. Disconnect the ELT
antenna coax to check for
possible re-radiation.
Replace the battery (refer to
section 8.4)
Contact Garmin technical
support.
Refer to Table 6-1 "RS-232
device is not communicating
with the
GPS 400W/GNS430W"
Contact Garmin technical
support to reload the basemap
data
Refer to Table 6-1 "ARINC 429
device is not receiving data
from the GPS 400W/GNS
430W"
Refer to Table 6-1 "RS-232
device is not communicating
with the 400W/430W"
Check for proper configuration
Check the wiring
Contact Garmin technical
support.
Contact Garmin technical
support.
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Rev. F