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Troubleshooting
Apollo SL40 Installation Manual
21
APPENDIX A - TROUBLESHOOTING
This appendix provides information to assist troubleshooting if problems occur after
completing the installation. Use Table 3 to assist in troubleshooting.
Table 3 Troubleshooting Guide
Problem Cause Solution
The SL40 does not power on. The unit is not getting power. Check power connections, breakers,
and main avionics switch.
The unit 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.
The input voltage is too low. Increase input supply voltage to > 9
volts DC.
Mic Sensitivity varies Mic Levels need adjustment See the Mic Level Adjustment on
page 13
The sidetone and intercom
levels are too low or high.
Wrong type of headsets, or level
needs adjustment.
See the Sidetone Level Adjustment on
page 12.
The intercom doesn’t function. Control input not connected. The intercom select input must be
pulled to ground to turn on the
intercom function.
No voice activation, or have to talk
too loud.
Change the intercom squelch
threshold using the setup function
described in the user’s manual.
CONTACTING THE FACTORY FOR ASSISTANCE
If the Apollo SL40 unit fails to operate despite troubleshooting efforts, contact the Garmin AT
factory for assistance.
Garmin AT, Inc.
2345 Turner Rd. SE
Salem, Oregon 97302
USA
Phone (503) 581-8101 or 1-800-525-6726
http://www.garminat.com
Be prepared to offer the following information about the installation:
x Installation configuration (accessories, antenna, ...)
x Model number, part number with mod levels, and serial number
x Software version
x Description of problem
x Efforts made to isolate the problem