Appendix A - Troubleshooting - Garmin Apollo SL30 COMM Installation Manual

A A - T
PPENDIX
This appendix provides information to assist troubleshooting if problems occur after
completing the installation. Use Table 4 to assist in troubleshooting.
Problem
The SL30 does not power on.
No NAV audio
NAV audio in Comm
The SL30 does not transmit.
The sidetone level is too low or
too high.
The intercom doesn't function.
Unit won't communicate via
RS-232
Resolver won't calibrate.
Unit won't communicate via
RS-232
Apollo SL30 Installation Manual
ROUBLESHOOTING
Table 4 - Troubleshooting Guide
Cause
The unit is not getting power.
Output disabled or set to a low level.
Mixed with Comm feature.
The TxKey input is not being pulled
low.
A weather channel is selected.
No power to the Comm.
The input voltage is too low.
Wrong type of headsets, or level
needs adjustment.
Control input not connected.
Active frequency signal present.
No voice activation, or have to talk
too loud.
Improper setup on the remote device.
Device not compatible, or improper
connection.
Incompatible resolver or improper
connection.
Improper setup on remote device,
device not compatible, or improper
connection.
Troubleshooting
Solution
Check power connections, breakers,
and main avionics switch.
Check System page; NAV Options;
NAV Audio Level.
Check System page; NAV Options;
Mix NAV Audio With Com.
Check the TxKey (mic key) input,
pulled low for transmit.
Select a different frequency, the unit
will not transmit on a weather
channel.
Make sure power input is connected
to the Comm 15 pin connector.
Increase input supply voltage to > 9
volts DC.
See the
Sidetone Level Adjustment on page
37.
The intercom select input must be
pulled to ground to turn on the
intercom function.
Change the active frequency. The
active frequency has priority.
Change the intercom level threshold
using the setup function described in
the user's manual.
Consult the configuration of the other
device.
Verify SL30 Rx is connected to
remote device Tx and SL30 Tx is
connected to remote device Rx.
Check the resolver specifications and
wiring.
Consult configuration of other
device. Verify Rx is connected to Tx
and Tx is connected to Rx of the
device.
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