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Troubleshooting
Apollo GX50/60/65 Installation Manual
43
APPENDIX A - TROUBLESHOOTING
This appendix provides information to assist troubleshooting if problems occur after
completing the installation. Use Table 4 to assist in troubleshooting.
Table 4 Troubleshooting Guide
Problem Cause Solution
The GX50/60/65 does not
power on.
The unit is not getting power. Check power connections, breakers,
and main avionics switch.
The GX50/60/65 does not
compute a position.
Not receiving signals, or incorrect
seed position, time, and date.
Make sure a correct position and
time/date have been entered. Check
the GPS antenna connections. Make
sure the aircraft is clear of hangers,
buildings, trees, etc.
The GPS signal levels are very
low.
Improper antenna installation or coax
routing.
Check GPS antenna installation,
connections, and cable routing. The
GPS antenna must be mounted on the
top of the aircraft.
Antenna shaded from satellites. Make sure the aircraft is clear of
hangers, buildings, trees, etc.
RF interference at 1575.42 MHz from
VHF comm.
Move GPS antenna further from the
comm antenna. Add a 1575.42 MHz
notch filter in comm coax. Fix or
replace the comm. Disconnect the
ELT antenna coax to check..
GPS signal levels drop when
avionics are turned on.
Noise interference from other
avionics.
Turn all avionics off, then turn on
each piece one at a time to isolate the
source of the interference. Route
cable and antenna away from sources
of interference.
The GX60/65 does not transmit. The TxKey input is not being pulled
low.
Check the TxKey (mic key) input,
pulled low for transmit.
A weather channel is selected. Select a different frequency, the unit
will not transmit on a weather
channel.
No power to the comm. Make sure power input is connected
to the comm 15-pin connector.
The input voltage is too low. Increase input supply voltage to > 9
volts DC.
The sidetone level is too low or
too high.
Wrong type of headsets, or level
needs adjustment.
See the Sidetone Level Adjustment on
page 28.
The intercom doesn’t function. Control input not connected. The intercom select input must be
pulled to ground to turn on the
intercom function.
Active frequency signal present. Change the active frequency. The
active frequency has priority.
No voice activation, or have to talk
too loud.
Change the intercom squelch
threshold using the setup function
described in the user’s manual.