Garmin apollo sl30 nav Manuale Utente

This appendix provides information to assist troubleshooting if problems occur after 
completing the installation. Use Table 4 to assist in troubleshooting. 

 

 

 

 

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.