Garmin Apollo CNX80 Installation Manaul - page 130
Troubleshooting
4-4
560-0982-01 Rev L
GNS 480 (CNX80) Installation Manual
Table 4-1. Troubleshooting Guide
Problem Possible
Cause
Solution
• Wiring connections are incorrect. • Check wiring
Tuning data not
updating DME
• DME Select is not low
• Wiring connections are incorrect.
• Verify DME Select pulled low.
• Check wiring.
• GNS 480 ARINC 429 output not
configured correctly.
• Check ARINC 429 output port setting
for port that device is connected to.
• ARINC 429 output port speed not
correct
• Check ARINC 429 output port speed
setting for port that device is connected
to and verify that the speed is correct for
that device.
ARINC 429 device is
not receiving data from
the GNS 480.
• Wiring connections are incorrect. • Check wiring.
• GNS 480 RS-232 port not
configured correctly.
• Check RS-232 port setting for port that
device is connected to.
• Improper setup on the remote
device.
• Verify the configuration of the other
device.
• Device not compatible, or improper
connection.
• Verify GNS 480 Rx is connected to
remote device Tx and GNS 480 Tx is
connected to remote device Rx.
RS-232 device is not
communicating with
the GNS 480.
• Multiple Tx lines connected
together (not applicable to dual
GNS 480’s controlling the SL70).
• Verify that there is only one Tx source
per Rx port (not applicable to dual
GNS 480s controlling the SL70).
4.2
Contacting the Factory for Assistance
If the GNS 480 unit fails to operate despite troubleshooting efforts, contact Garmin Technical Support for
assistance.
GARMIN International, Inc.
1200 East 151
st
Street
Olathe, KS 66062-3426
USA
Phone: (913) 397-8200
FAX: (913) 397-8282
http://www.garmin.com
Be prepared to offer the following information about the installation:
• Installation configuration (list of any accessories)
• Model number, part number with mod levels, and serial number
• Software Versions
• Description of problem
• Efforts made to isolate the problem