Garmin AT Inc. SL-70 Manual Do Utilizador

This appendix provides information to assist troubleshooting if problems occur after
completing the installation. Use Table 3 to assist in troubleshooting.

The SL70 does not power on.

The unit is not getting power.

Check power connections, breakers,
and main avionics switch.

The altitude is not correct.

The unit is not getting the correct
altitude.

If the gray code inputs are used,
check all connections from the
altitude source and/or verify the
altitude source.
If the serial altitude input is used,
check for the correct baud  rate and
connections to the altitude source.

The altitude display is “---“

The unit is not getting an altitude, or
the altitude is invalid.

Check the connections to the altitude
source.
Check the altitude source to make
sure it is operating correctly.

The unit fails the start-up test.

TX fails.

Check antenna connections.

Other failure.

The unit may need repair.

The unit does not generate
replies.

The unit is in standby.

The unit must be in either the “On” or
“Alt” modes to generate replies.

The unit is not receiving interrogation
signals.

Check the antenna connections. If the
unit does not “Fail” the receive test,
then check antenna connections.

No interrogation signal available.

Need to either use a ramp test set or
climb to altitude where ATC radar
service is available.