Zodiac Aerospace GPS, User Manual, Page: 29 / 36

MUT100072E1R3 — 02 – 2019 25
TROUBLESHOO
TINGS
6. TROUBLESHOOTINGS
Issue Probable cause Fix Refer to
Any external signals
Bad connection
CED not connected to
GND
Check your setup and connect Pin 6 to pin
3, 5, 9 or 11 pin on the 13 pin female con-
nector
Configuration default
Check your DAU configuration, compile it
and load it in your device
⇨
OPERATION – page 5
External serial link
malfunction
Wrong connection
Cross the TX and Rx RS232 signals
Pin 2 and 8
Bad serial configuration Adapt the DAU configuration to your setup
⇨
GPS data source – page 5
GPS module
never locked
Bad antenna connection
Lower or any RF signal on
the RF entry
Verify the RF cable type uses and clamp the
plug as recommended in this manual
Too much power creat-
ing jam effect
The signal to noise ratio don’t exceed
55dBHz.
Reduce the gain antenna.
GPS antenna placed near
jamming source Add a GPS band filter and/or if possible
modify your system setup
Too old GPS parameter in
memory
Restart your DAU to refresh the GPS param-
eters.
Adapt the GPS chipset settings (Reset
parameters and conditional reset) to your
application
⇨
GPS Chipset settings – page 7
Active antenna default
configuration
Change and select the antenna configura-
tion (passive, Active 3Volt or Active 5Volt) in
accordance with the antenna type you use
⇨
Antenna settings – page 6
Unstable locking
Harsh environment need
to refresh frequently the
GPS parameters Adapt the GPS chipset settings (Reset
parameters and conditional reset) to your
application
⇨
GPS Chipset settings – page 7
Undesirable GPS
parameter displayed
/ Buzzy parameters
Wrong configuration
Check your configuration: mode, frame
type and position parameters
⇨
Digital message – page 8
Bad multiplier parame-
ters create wrong or
unexpected value Adapt your configuration to your setup and
change the multiplier parameters