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Troubleshooting
Apollo SL30 Installation Manual
51
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 SL30 does not power on. The unit is not getting power. Check power connections, breakers,
and main avionics switch.
No NAV audio Output disabled or set to a low level. Check System page; NAV Options;
NAV Audio Level.
NAV audio in Comm Mixed with Comm feature. Check System page; NAV Options;
Mix NAV Audio With Com.
The SL30 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
37.
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 level threshold
using the setup function described in
the user’s manual.
Unit won’t communicate via
RS-232
Improper setup on the remote device.
Device not compatible, or improper
connection.
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.
Resolver won’t calibrate. Incompatible resolver or improper
connection.
Check the resolver specifications and
wiring.
Unit won’t communicate via
RS-232
Improper setup on remote device,
device not compatible, or improper
connection.
Consult configuration of other
device. Verify Rx is connected to Tx
and Tx is connected to Rx of the
device.